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Journal articles on the topic 'Curing Concrete'
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1
He, Zhi Min, and Jun Zhe Liu. "Effect of Steam Curing on Water Sorptivity of Concrete." Key Engineering Materials 477 (April 2011): 263–67. http://dx.doi.org/10.4028/www.scientific.net/kem.477.263.
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This paper carried out experiments to investigate the change of water absorption gradient of standard curing concretes and steam-cured concretes cured at 60°C. The effect of steam curing on concretes water absorption was evaluated, and the corresponding mechanism was also discussed. Results indicate that the change of water absorption gradient of standard curing concretes is non-significant with the change of the specimen height; Steam curing has exacerbated the inhomogeneity between the top surface and interior surface of concretes. It is observed that noticeable gradient difference in aborption characteristics between top, the second (1cm below top surface) and the third (3cm below top surface) surfaces of samples. Top surface absorption capacity has been the highest, and the second surfaces are in rather good accordance with the third surface. Thus the effect depth of steam curing is near to the concrete open surface. The addition of silica fume to a concrete decrease the water sorptivity of steam curing and standard curing concretes, but for the improvement of the uniformity of concrete, the effect is not markedly obvious.
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Jin, Hu. "Late-Age Properties of Concrete with Different Binders Cured under 45°C at Early Ages." Advances in Materials Science and Engineering 2017 (2017): 1–13. http://dx.doi.org/10.1155/2017/8425718.
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It is commonly accepted that high curing temperature (near 60°C or above) results in reduced mechanical properties and durability of concrete compared to normal curing temperature. The internal temperature of concrete structures at early ages is not so high as 60°C in many circumstances. In this paper, concretes were cured at 45°C at early ages and their late-age properties were studied. The concrete cured at 20°C was employed as the reference sample. Four different concretes were used: plain cement concrete, concrete containing fly ash, concrete containing ground granulate blast furnace slag (GGBS), and concrete containing silica fume. The results show that, for each concrete, high-temperature curing after precuring does not have any adverse effect on the nonevaporable water content, compressive strength, permeability to chloride ions, and the connected porosity of concrete at late ages compared with standard curing. Additionally, high-temperature curing improves the late-age properties of concrete containing fly ash and GGBS.
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Maltais, Y., J. Marchand, R. Gagné, and A. Tagnit-Hamou. "Effets des cendres volantes sur le développement des résistances mécaniques des bétons préfabriqués." Canadian Journal of Civil Engineering 23, no. 4 (August 1, 1996): 940–49. http://dx.doi.org/10.1139/l96-900.
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The results of an investigation of the influence of fly ashes on the development of mechanical properties of concretes subjected to 24-h thermal curing are presented in this paper. In addition to the curing temperature (23 and 60 °C), the variables studied in this investigation were the type of cement (types 10 and 30) and the source of fly ashes (four different North-American class F fly ashes). Overall, 10 different concrete mixtures were tested. Test results indicate that thermal curing tends to increase significantly the concrete compressive strength in the first 24 h. Data also demonstrate that the thermal curing regime does not have any detrimental effect on the long-term compressive strength of ordinary portland cement concrete. Compressive strength of fly ash concretes was significantly reduced by thermal curing in the 1- to 28-day period, despite an initial increase. The influence of thermal curing on the development of concrete compressive strength is discussed. Key words: compressive strength, steam curing, fly ashes, precast concrete.
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He, Zhi Min, and Jun Zhe Liu. "Effect of Binders Combination on Porosity of Steam-Cured Concrete." Advanced Materials Research 183-185 (January 2011): 1984–88. http://dx.doi.org/10.4028/www.scientific.net/amr.183-185.1984.
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Under steam curing condition, there is significant increment in the porosity of concrete. For the purpose of reducing porosity of steam-cured concrete and improving the durability of steam-cured precast elements, this paper carried out contrastive experiments including two curing condition (steam curing and standard curing), simultaneously considering the effect of different binders type, investigated the porosity change of steam curing and standard curing concretes with mineral admixtures. The corresponding mechanism was also discussed. Results indicated that, taking replace of 30% cement with double-mixing fly ash and silica fume achieves the lowest steam-cured concrete porosity. Steam curing technological measures exert a significant influence on the steam-cured concrete unclosed top suface porosity. For the characteristics of different concrete mixtures, the same steam curing technological measures exert different influence. For the same concrete, adopting appropriate technological measures can greatly decreased the porosity of concrete surface to be exposed, especially for concrete with high water-binder ratio.
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Sounthararajan, Vallarasu Manoharan. "Empirical Prediction Models for Strength Gain Properties of Fly Ash Based Concrete Subjected to Accelerated Curing." Advanced Materials Research 1150 (November 2018): 73–90. http://dx.doi.org/10.4028/www.scientific.net/amr.1150.73.
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Experimental investigations on the early age, strength gain properties of fly ash blended cement concretes containing low and high volume fly ash replacement were studied. Concrete mixes were prepared with two different fly ash contents and varying concrete ingredients with water to binder ratio (w/b), fine to coarse aggregate ratio (F/c) and accelerator dosage. Five different curing techniques, namely controlled humidity curing; hot air oven curing, steam curing, hot water curing and normal water curing were adopted for curing the fly ash based concretes. Test results showed evidence the influence of accelerating admixtures and accelerated curing for obtaining the high early strength properties in fly ash mixed concrete. Most notably a maximum 1 day compressive strength of 40.20 MPa and 34.60 MPa with low (25%) and high (50%) volume fly ash concretes were obtained respectively in this study. Experimental results clearly indicated that the improvements on the strength gain properties with the careful selection of mix ingredients; accelerator addition and accelerated curing in fly ash based concrete mixes. Also, significant improvements on the flexural strength, elastic modulus, dynamic modulus and the ultrasonic pulse velocity test were noticed.
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Yang, Jun, Qiang Wang, and Yuqi Zhou. "Influence of Curing Time on the Drying Shrinkage of Concretes with Different Binders and Water-to-Binder Ratios." Advances in Materials Science and Engineering 2017 (2017): 1–10. http://dx.doi.org/10.1155/2017/2695435.
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Plain cement concrete, ground granulated blast furnace slag (GGBS) concrete, and fly ash concrete were designed. Three wet curing periods were employed, which were 2, 5, and 8 days. The drying shrinkage values of the concretes were measured within 1 year after wet curing. The results show that the increasing rate of the drying shrinkage of concrete containing a mineral admixture at late age is higher than that of plain cement concrete regardless of the wet curing time. With the reduction of wet curing time, the increment of total drying shrinkage of concrete decreases with the decrease of the W/B ratio. The negative effects on the drying shrinkage of fly ash concrete due to the reduction of the wet curing time are much more obvious than those of GGBS concrete and plain cement concrete. Superfine ground granulated blast furnace slag (SGGBS) can reduce the drying shrinkage of GGBS concrete and fly ash concrete when the wet curing time is insufficient.
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Turu'allo, Gidion. "Sustainable Development of Concrete Using GGBS: Effect of Curing Temperatures on the Strength Development of Concrete." Applied Mechanics and Materials 776 (July 2015): 3–8. http://dx.doi.org/10.4028/www.scientific.net/amm.776.3.
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The World Earth Summits in Rio de Janeiro, Brazil and Kyoto, Japan in 1992 and 1997 respectively, have made it clear that uncontrolled increased emission of greenhouse gases to the atmosphere is no longer environmentally and socially acceptable for sustainable development. The increase of cement production will affect the environmental preservation, natural conservation and increase the CO2emission, which is one of the primarily gases that contribute to the global warming. The use of ground granulated blast furnace slag (ggbs) to replace a part of Portland cement in concrete can reduce the CO2emission. It also can provide significant benefits to concrete properties, such as increase the workability and durability of concrete. The early strength of ggbs concretes that had been cured at standard curing temperature (20°C) were slower than that of concretes with Portland cement only, cured at the same temperature. However, there are some indications show that curing the ggbs concrete at elevated temperatures will significantly enhanced the early age strength of the concrete. The objectives of this research are to find out the effect of curing temperatures and levels replacement of Portland cement by ggbs on the strength development of concretes. The levels of ggbs to replace Portland cement were 0, 20, 35, 50 and 70%, while the curing temperatures were 20°C, 50°C and adiabatic curing. The concrete cubes were tested at ages: 6 and 12 hours, 1, 2, 4, 8, 16, 32, 64, 128, 256 and 365 days. The results showed that curing the ggbs concrete at temperatures higher than standard curing temperature, increased the strength development of the concrete at early ages.
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He, Zhi Min, Xiao Ju Shen, and Jun Zhe Liu. "Effect of Gypsum on Strength Development of Steam-Cured Concrete." Advanced Materials Research 194-196 (February 2011): 1085–88. http://dx.doi.org/10.4028/www.scientific.net/amr.194-196.1085.
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The use of fly ashes for cement-replacement purposes, especially in high volumes, decreases rate of early strength development of the steam curing concrete. To resolve it, this paper developed a new steam-cured concrete incorporating fly ash and a chemical activator (gypsum). Experiments were conducted to investigate the mechanical properties at early and later ages of steam and standard curing concretes. The corresponding mechanism was also discussed by testing the microstructure of concretes. Results indicate that the demoulding compressive strength of steam curing concrete with 4% gypsum dosage can meet production requirements, and compressive strength of this concrete at later ages increase well. Compared with that of ordinary pure cement steam-cured concrete, concrete with 4% gypsum has a higher compressive strength gain rate. At an early age, addition of the gypsum can distinctly accelerate the extent of hydration of the steam curing fly ash cement systems, and thus the microstructure of concrete becomes denser. However, in standard curing condtion, the effect of gypsum is not distinct.
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Shafeeque.V, Mohammed, Sanofar P.B, Praveen K.P, Jithin Raj, Nikhil V.P, and Gopikrishna P.M. "Strength comparison of self-curing concrete and Normal curing concrete." International Journal of Civil Engineering 3, no. 3 (March 25, 2016): 56–61. http://dx.doi.org/10.14445/23488352/ijce-v3i3p110.
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Camarini, Gladis. "Curing Effects on Air Permeability of Concrete." Advanced Materials Research 214 (February 2011): 602–6. http://dx.doi.org/10.4028/www.scientific.net/amr.214.602.
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The kinetics of cement hydration can be accelerated by steam curing and this kind of curing can be responsible for increasing concrete porosity, since a greater portion of non hydrated cement particles can be present. The increased porosity results can result in increased permeability. The aim of this work was to investigate the influence of curing on concrete quality by air permeability and compressive strength test. It was measured by means of a non steady state air permeameter. Concretes were produced with Portland cements containing 0%, 27% and 53% of ground granulated blastfurnace slag. The amount of slag in cement influenced concrete performance and steam curing increased air permeability of concrete.
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Krishna, Rao, Rathish Kumar, and Azhar Khan. "A study on the influence of curing on the strength of a standard grade concrete mix." Facta universitatis - series: Architecture and Civil Engineering 8, no. 1 (2010): 23–34. http://dx.doi.org/10.2298/fuace1001023k.
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Curing is essential if concrete is to perform the intended function over the design life of the structure while excessive curing time may lead to the escalation of the construction cost of the project and unnecessary delays. Where there is a scarcity of water and on sloping surfaces where curing with water is difficult and in cases where large areas like pavements have to be cured, the use of curing compound may be resorted to. The parameters of the study include the curing period [1, 3, 7, 14 and 28 day], curing method [conventional wet curing, membrane forming compound curing and accelerated curing] and the type of cement [Ordinary Portland Cement(OPC) 43 grade, Portland Pozzolana Cement(PPC) 43 grade and Ordinary Portland Cement(OPC) 43 grade +10% Silica Fume(SF) replacement for cement]. In all a total of 99 cube specimens were cast and cured under different conditions before testing. Test results indicate a drop in strength at all ages for concretes with PPC and the one in which 10% OPC is replaced by silica Fume(SF) in comparison with the concrete with OPC. Curing by membrane forming curing compound yielded nearly the same results as that of conventional wet curing for concrete with OPC and there was a marginal decrement in concrete with PPC. Predicted 28-day strength of concrete from the accelerated curing test was found to be on a conservative side compared to control concrete.
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Wang, Hai Liang, Zhuo Cui, Chuan Li, and Ru Cang Bao. "Mechanical Property of Solidified Concrete by Explosion as Concrete is in Flow Pattern." Advanced Materials Research 194-196 (February 2011): 1073–76. http://dx.doi.org/10.4028/www.scientific.net/amr.194-196.1073.
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We have made the concrete test blocks, which were blasted by different charge quantities in the semi-infinite soil. Using the SHIMADZU Universal Testing Machine AG-X250kN system, we performed the uniaxial compression test, studied the stress-strain curves of concretes by explosion, under the same condition curing and the standard curing. The results show that, concrete will have higher compression strength by explosion. And there is an optimal charge quantity, when the concrete consumption is given. With this optimal charge quantity, compression property of concrete by explosion is superior to concrete cured at standard.
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Wedatalla, Afaf M. O., Yanmin Jia, and Abubaker A. M. Ahmed. "Curing Effects on High-Strength Concrete Properties." Advances in Civil Engineering 2019 (March 6, 2019): 1–14. http://dx.doi.org/10.1155/2019/1683292.
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This study was conducted to investigate the impact of hot and dry environments under different curing conditions on the properties of high-strength concrete. The concrete samples were prepared at a room temperature of 20°C and cured under different curing conditions. Some specimens underwent standard curing from 24 h after casting until the day of testing. Some specimens underwent steam curing in a dry oven at 30°C and 50°C after casting until the day of testing. Other specimens were cured for 3, 7, 21, and 28 days in water and then placed in a dry oven at 30°C and 50°C and tested at the age of 28 days, except for the specimens that were cured for 28 days, which were tested at the age of 31 days, to study the effect of curing period on the strength of concrete exposed to dry and hot environments after moist curing. The effects of hot and dry environments on high-strength concrete with different water/binder ratios (0.30, 0.35, and 0.40), using (30%) fly ash for all mixes, and (0%, 5%, and 10%) silica fume with the binder (450, 480, and 520 kg), respectively, were separately investigated, and the effects of curing under different conditions were evaluated by measuring the compressive strength, flexural strength, microhardness, and chloride diffusion and by assessing the concretes’ microstructure. The relationships between these properties were presented. A good agreement was noted between the concrete compressive strength and concrete properties at different temperatures, curing periods, and curing methods.
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Jeong, Jin-Hoon, and Dan G. Zollinger. "Development of Test Methodology and Model for Evaluation of Curing Effectiveness in Concrete Pavement Construction." Transportation Research Record: Journal of the Transportation Research Board 1861, no. 1 (January 2003): 17–25. http://dx.doi.org/10.3141/1861-03.
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Early-age moisture loss from the surface of a concrete pavement may induce undesirable effects that play a factor in long-term performance. Early-age detrimental behavior such as slab curling, warping, delamination, and even plastic shrinkage cracking are affected by the amount of evaporation and the effectiveness of the curing medium. The rate of evaporation is a key item in the monitoring of the quality of the curing. However, most approaches for this are largely empirical and are useful only under laboratory conditions. The effective curing thickness concept is introduced as a method to evaluate the effectiveness of a curing method. The surface relative humidity has the biggest influence on both the effective curing thickness and the rate of evaporation. Thus, prediction of the rate of evaporation of the water from concrete depends on the relative humidity of the surface and is important for evaluation of the curing method. Existing evaporation models, including the American Concrete Institute nomograph, were evaluated for their capabilities in predicting evaporation from curing concrete. Data from a series of laboratory experiments with a modified version of Penman’s evaporation model are also presented.
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Mallikarjuna Reddy, Dr V., and S. Hamsalekha. "Smart Concrete Curing System." E3S Web of Conferences 184 (2020): 01086. http://dx.doi.org/10.1051/e3sconf/202018401086.
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In the present era, water scarcity is the biggest problem. In Construction potable water is required for mixing and curing of concrete. The curing process is required for 28 days. So the water requirement in the construction field for curing purposes is very large. Due to various reasons, potable water availability is decreasing day by day. So it is required to spend a considerable amount on the procurement of water. To control the wastage of water for curing it is necessary to use water in a controlled manner by adopting advanced technology. It is known as a smart concrete curing system. The smart concrete curing system is developed to create an automatic curing mechanism to supply water for curing depending on the availability of moisture in the concrete and surrounding temperature using moisture sensor. The system will be connected to the internet using Wi-Fi. The current moisture content level of the concrete structure and the pump status will be pushed to the cloud. A mobile app will access this data from the cloud. So that the curing process monitoring can be done remotely. Results shown that strength of the cube with smart concrete curing system is more than the strength of the cube with immersion curing.
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Manikandan, K. B., and C. Umarani. "Understandings on the Performance of Concrete-Filled Steel Tube with Different Kinds of Concrete Infill." Advances in Civil Engineering 2021 (May 3, 2021): 1–12. http://dx.doi.org/10.1155/2021/6645757.
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In recent years, concrete-filled steel tube (CFST) has gained attention in the construction sectors due to its unique static and earthquake resistant properties. The steel-concrete composite member is formed by filling the concrete inside the hollow steel tube of various shapes. The experimental and numerical investigations were carried out for CFST members filled with different types of concrete of the same grade. The types of concrete used for this study are conventional concrete, steel fiber-reinforced concrete, geopolymer concrete, and expansive concrete, respectively. The concretes were cast in the form of cubes followed by curing underwater and self-curing conditions. The specimens cured for 7 and 28 days of age were subjected to axial compressive strength testing. The effect of curing conditions on the strength of concrete was evaluated by comparing the obtained results. Self-curing, the only possible way of curing infilled concrete in the case of CFST columns, was found to have no influence on the strength of concrete, and the same curing method was adopted for the CFST columns tested in this study. A total of 24 CFST specimens were cast by different types of concrete infill, and their load carrying capacity under axial compression and their bond strength were determined through experimental investigations. The characteristic strengths measured for the CFST columns with different types of concrete infill were compared, and the results are presented. The analytical investigations were carried out by using Eurocode-4 to predict the load-bearing capacity of CFST columns under axial compression. Finally, the load carrying capacities of CFST columns under axial compression obtained through experimental and simulation studies were compared and the results are presented.
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Ikotun, Jacob Olumuyiwa. "Effects of concrete quality and natural Johannesburg environment on concrete carbonation rate." MATEC Web of Conferences 199 (2018): 02008. http://dx.doi.org/10.1051/matecconf/201819902008.
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This study presents the results of a project undertaken to study the combined effects of concrete quality (binder type, w/b, and duration of initial moist curing) and natural Johannesburg environment on carbonation rate of concretes containing 100% PC, 35% fly ash (FA), 50% ground granulated blast-furnace slag (BS), 10% silica fume (SF) and (30% BS + 10% SF). The results show that apart from the SF blended concretes, the carbonation rate of the SCM blended concretes are higher than the PC concretes. Reducing the w/b and increasing the duration of initial moist curing reduced the carbonation rate in the concretes. The indoor exposed concretes have the highest carbonation rates and reducing the w/b ratio is more efficient and sustainable in lowering the carbonation rate rather than extending the duration of the initial moist curing.
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Li, Xiao, and Wan Yang Niu. "Effect of Supplementary Curing after Steam-Curing on Performance of Concrete." Materials Science Forum 852 (April 2016): 1376–82. http://dx.doi.org/10.4028/www.scientific.net/msf.852.1376.
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When the low strength grade of steam-curing concrete is produced, the temperature which the concrete leaves steam-curing kiln is about 20°C commonly. The temperature difference is too large between the environmental temperature and the temperature which the concrete leaves steam-curing kiln when the daily average temperature drops to 10°C. Because the steam-curing concrete is cooled rapidly, a large of crack will be produced in concrete and the internal structure of concrete will be damaged normally. Then the performance of concrete will be influenced badly. In order to improve the negative effect on concrete by steam curing, the different supplementary curing is used after steam curing. The C30 concrete is made in this research. The daily average temperature is 5°C~10°C and the minimum temperature is-6°C during the test. After the concrete is formed, it is placed in 20°C environment for 2h first. Then the concrete is heated to 55°C in 2h and maintained for 8h in the steam-curing kiln. In the end, the concrete is cooled to 20°C in 3h. After steam curing, the standard curing and covering by wet fabric or film outside are used separately for concrete. The supplementary curing time is 1d, 2d, 3d and 4d. Then the concrete is placed in natural environment to 28d. The microstructure of hydration products are observed by electron microscope. The density of concrete is analyzed by the result of the 28d saturated water content, softening factor and 28d rapid carbonation depth. The mechanical properties of concrete are researched by the result of the 28d strength. When the concrete adopts standard curing or covering by film after steam-curing, the saturated water content and 28d rapid carbonation depth of the concrete will reduce, but the softening factor and 28d strength of the concrete will increase with the time. The performance of concrete which adopts covering by wet fabric after steam-curing is worse than that adopting standard curing. At the same time, the saturated water content and softening factor of concrete change little. Covering by wet fabric is worse than no covering or similar. In the test environment, the performance of the steam-curing concrete with each supplementary curing is worse than that of the concrete with standard curing. The standard curing is the best supplementary curing in this test. But covering by film is a worthy supplementary curing from economy and practicability. Covering by film for 4d, the 28d strength of steam-curing concrete is 87 percent of that of the concrete with standard curing and exceeds Design grade. Its saturated water content is 1.50% and softening factor is 0.932. Its rapid carbonation depth is close to that of the concrete with standard curing and its microstructure of hydration products is preferable.
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Sanni, Shankar H., and Dr R. B. Khadiranaikar Dr. R. B. Khadiranaikar. "Performance Of Geopolymer Concrete Under Various Curing Conditions." International Journal of Scientific Research 2, no. 3 (June 1, 2012): 178–80. http://dx.doi.org/10.15373/22778179/mar2013/57.
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Li, Peng Ping, Gui Hong Dong, and Jian Bo Xiong. "The Correlation of Chloride Diffusion Coefficient and Concrete Maturity Value and its Application in Marine Engineering." Advanced Materials Research 1004-1005 (August 2014): 1551–55. http://dx.doi.org/10.4028/www.scientific.net/amr.1004-1005.1551.
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The correlation of chloride diffusion coefficient and concrete maturity value within 56 days of curing was investigated by the chemically combined water content method, rapid chloride migration (RCM) test and concrete maturity test, respectively. The experimental results showed the chloride diffusion coefficient of concretes decreased not only with increasing curing ages, but also with increasing curing temperature, which can promote the hydration degree of cementitous. There is a significant correlation between the chloride diffusion coefficient of indoor curing specimens and the concrete maturity value when expressed as a power function (R2=0.976), and the calculated values of concrete maturity for outdoor specimens which obtained by using the power function agrees well with the measured values, then it can use the measured concrete maturity value to predict the chloride diffusion coefficient of concrete. And then in this project, when the immersed tube tunnels were placed in seawater, the recommended value and the control value of concrete maturity was 21064°C•h and 13926°C•h, respectively. Furthermore, the ages of the tunnels placed in seawater can be appropriately adjusted by calculation when considering the external curing temperature and heat of hydration of cementious.
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Al-Swaidani, A. M. "Effects of Curing Time on the Performance of Volcanic Scoria-Based Binder Concretes." Archives of Civil Engineering 63, no. 1 (March 28, 2017): 133–50. http://dx.doi.org/10.1515/ace-2017-0009.
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Abstract The objective of the presented paper is to investigate the performance of concrete containing volcanic scoria as cement replacement after 7, 28, 90, and 180 days curing. Five performance indicators have been studied. Compressive strength, water permeability, porosity, chloride penetrability, and reinforcement corrosion resistance have all been evaluated. Concrete specimens were produced with replacement levels ranging from 10 to 35%. Test results revealed that curing time had a large influence on all the examined performance indicators of scoria-based concrete. Water permeability, porosity, and chloride penetrability of scoria-based concrete mixes were much lower than that of plain concrete. Concretes produced with scoria-based binders also decelerated rebar corrosion, particularly after longer curing times. Furthermore, an estimation equation has been developed by the authors to predict the studied performance indicators, focusing on the curing time and the replacement level of volcanic scoria. SEM/EDX analysis has been reported as well.
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TEKİN, İlker. "An In-Situ Study on The Specimen Size Effects on Compressive Strength for Different Strength Concretes." CEBACOM Vol:1 Issue 3 1, no. 3 (March 8, 2021): 7–10. http://dx.doi.org/10.36937/cebacom.2020.003.002.
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The compressive strength of concrete is the most basic and considerable material property while reinforced concrete structures are designed. It has become a problem to use this value, however, because the control specimen sizes and shapes from country to country may be dissimilar. The study presents the results of an experiment that examined the effect of specimen size on the different classes of compressive strengths of concrete. The study included casting specimens, cubes, and six different classes of the concrete mixture. Compression tests were conducted at the age of 3, 7, and 28 days on 150 mm & 100 mm cube samples. The fresh properties of concrete were measured by slump and unit weights tests. Moreover, the specimen size of concrete has an important role both on the compressive strength and capacity of a curing cabinet. Correlations between compressive strengths and sizes of specimens are compatible for classes of structural concretes. Therefore, it can be used in curing cabinet varying sizes of concretes like 150 mm & 100 mm cube samples. Although almost 220 concrete specimens sized of 150 mm cube can be poured in curing tank, roughly 585 concrete specimens can be poured with using 100 mm cube concrete specimens. The most convenient size resulted from this study is suggested as 100 mm sized cubic specimen that it promote to change the law for concrete both curing and compressive strength test.
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Gopala krishna sastry, K. V. S., and Putturu manoj kumar. "Self-curing concrete with different self-curing agents." IOP Conference Series: Materials Science and Engineering 330 (March 2018): 012120. http://dx.doi.org/10.1088/1757-899x/330/1/012120.
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Mussa, Mohamed H., Ahmed M. Abdulhadi, Imad Shakir Abbood, Azrul A. Mutalib, and Zaher Mundher Yaseen. "Late Age Dynamic Strength of High-Volume Fly Ash Concrete with Nano-Silica and Polypropylene Fibres." Crystals 10, no. 4 (March 26, 2020): 243. http://dx.doi.org/10.3390/cryst10040243.
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The dynamic behaviour of high-volume fly ash concrete with nano-silica (HVFANS) and polypropylene fibres at curing ages of 7 to 90 days was determined by using a split Hopkinson pressure bar (SHPB) machine. At each curing age, the concrete samples were laboratory tested at different temperatures conditions under strain rates reached up to 101.42 s−1. At room temperature, the results indicated that the dynamic compressive strength of plain concrete (PC) was slightly higher than HVFANS concrete at early curing ages of 7 and 28 days, however, a considerable improvement in the strength of HVFANS concrete was noted at a curing age of 90 days and recorded greater values than PC owing to the increase of fly ash reactivity. At elevated temperatures, the HVFANS concrete revealed a superior behaviour than PC even at early ages in terms of dynamic compressive strength, critical strain, damage and toughness due to increase of nano-silica (NS) activity during the heating process. Furthermore, equations were suggested to estimate the dynamic increase factor (DIF) of both concretes under the investigated factors.
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Kang, Dae Hyun, Hye Ran Kim, and Hyun Do Yun. "Effect of Steel Fiber Volume Fraction and Curing Conditions on the Compressive Behavior of Alkali-Activated Slag Concrete." Applied Mechanics and Materials 525 (February 2014): 491–94. http://dx.doi.org/10.4028/www.scientific.net/amm.525.491.
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In this paper, an experimental investigation was carried out to examine the influence of hooked end steel fiber volume fraction and curing conditions on the compressive performance of concrete produced by using ordinary portland cement (OPC) and alkali-activated slag (AAS). Three different volume fractions of 0.5%, 1.0% and 1.5% were used in OPC and AAS concrete mixtures. Cylindrical specimens with 100 x 200mm were tested for compressive behavior of both concretes at 3, 7 and 28 days of curing age. Test results showed that curing conditions had a significant effect on compressive properties in the hardened OPC and AAS concretes. The addition of steel fibers generated a decrease in compressive strength of OPC while an increase in the compressive strength of AAS concrete was shown with adding steel fiber.
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Bashandy, Alaa A., Nageh N. Meleka, and Mohamed M. Hamad. "Comparative study on the using of PEG and PAM as curing agents for self-curing concrete." Challenge Journal of Concrete Research Letters 8, no. 1 (April 4, 2017): 1. http://dx.doi.org/10.20528/cjcrl.2017.01.001.
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There are many factors, which may affect on concrete quality. One of those is concrete curing. Self-curing concrete is the solution. It may produce by using chemical curing agents. The concept of those agents is to reduce the water evaporation from concrete. This research aims to study the effect of chemical curing agents on the behavior of self-curing concrete. Two different chemical curing agents were used to study the main mechanical properties of concrete. The main variables are; the type of curing agent (Polyethylene glycol "PEG400"–Poly Acrylamide "PAM") and its dosages. The results obtained in terms of compressive, tensile and flexure strength values. Test results showed that the self-curing concrete cured by each agent performed better in hardened properties compared to none cured concrete. Also, curing using the both agents together perform better than using each one individually.
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Aljalawi, Nada, and Amar Yahia AL-Awadi. "Effect of internal curing on performance of self-compacting concrete by using sustainable materials." MATEC Web of Conferences 162 (2018): 02017. http://dx.doi.org/10.1051/matecconf/201816202017.
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This paper is devoted to investigate the effect of internal curing technique on the properties of self-compacting concrete. In this study, self-compacting concrete is produced by using limestone powder as partial replacement by weight of cement with percentage of (5%), sand is partially replaced by volume with saturated fine lightweight aggregate which is thermostone aggregate as internal curing material in three percentages of (5%, 10%, 15%) for self-compacting concrete, and the use of two external curing conditions which are water and air. The experimental work was divided into three parts: in the first part, the workability tests of fresh self-compacting concrete were conducted. The second part included conducting compressive strength test and modulus of rupture test at ages of (7, 28 and 90) days. The third part included doing the shrinkage test at age of (7, 14, 21, 28) days. The results show that internally cured self-compacting concrete has the best workability and the best properties of hardened concrete which include (compressive strength, modulus of rupture) of externally cured self-compacting concrete with both water and air as compared with reference concretes. Also, the hardened properties of internally cured self-compacting concrete with percentage of (5%) with thermostone aggregate is the best as compared with that of percentages (10% and 15%) in both external curing conditions. In general, the results of shrinkage test have shown reduction in shrinkage of internally cured self-compacting concrete as compared with reference concretes and this reduction increases with increase in the thermostone aggregate content-within-self-compacting-concrete.
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Memon, R. P., A. R. M. Sam, A. Z. Awang, and U. I. Memon. "Effect of Improper Curing on the Properties of Normal Strength Concrete." Engineering, Technology & Applied Science Research 8, no. 6 (December 22, 2018): 3536–40. http://dx.doi.org/10.48084/etasr.2376.
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In real applications, 28 days are regarded as proper curing time for concrete. There is a self-evident need to minimize the duration of curing days. For this purpose, this research investigates 1 to 7 days of curing and compares it with concrete cured for 28 days. Three grades of normal concrete strength grade 30, grade 35 and grade 40 were made. After curing, two exposure conditions were applied to the concrete, inside laboratory-controlled environment and outside environment. Results indicate that slump increases with cement content in DOE method at constant water content. The concrete density in all grades reduces when the concrete is subject to inside exposure in comparison with outside exposure. Water loss from concrete reduces with increase in curing days in all concrete grades. Compression strength of all concrete grades increases with increase in curing days. For the uniformity of concrete, ultrasonic pulse velocity indicated that with an increase in curing days, concrete becomes denser and a bit void. Results showed that an increase in curing days also improves the surface quality of concrete. The significance point noticed is that there was not much difference in the concrete properties between 7 days of curing and 28 days of curing in all grades.
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He, Xi Xi, and Dian Biao Zhao. "Influence of Hydration Heat of Fly Ash Concrete on Size Effect." Applied Mechanics and Materials 405-408 (September 2013): 2916–22. http://dx.doi.org/10.4028/www.scientific.net/amm.405-408.2916.
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In this paper, the influence of fly ash concretes sustained hydration heat release effect on strength size effect was studied, by using different curing temperature indoor and outdoor in winter. The results showed that the reduce of hydration heat for fly ash concrete is not conducive to ensure the strength of concrete cured outdoor or indoor in winter. However, the growth of volume is beneficial to ensure the necessary hydration heat in concrete curing, so that the size effect of concrete strength appears that the strength increases with size increasing.
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Liu, Min, De Ping Chen, and Jing Yu Liu. "Carbon Dioxide Curing of Foam Concrete with Different Bulk Densities." Advanced Materials Research 374-377 (October 2011): 1764–69. http://dx.doi.org/10.4028/www.scientific.net/amr.374-377.1764.
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Carbon dioxide curing was adopted to accelerate the hydration of foam concrete samples with a lower bulk density level of around 450 kg/m3 and a higher level of around 1150 kg/m3. The bending strength, compressive strength and ultrasonic transmission velocity of carbonated harden foam concrete were tested, the hydration products were analyzed by means of XRD and TG/DSC. The results show as: (1) By comparing with standard curing samples, there are more than 47% increments of specific strengths of carbonated foam concrete with the higher density level at a certain curing time before 14d. However, for the lower density level one, there is just a significant improvement of specific bending strength obtained before 7d. (2) The carbonated foam concretes with the lower density level show lower ultrasonic transmission velocity than standard curing ones. The velocities have hardly difference for both carbonated and standard curing samples with the higher density level. (3) Vaterite can’t be found in carbonated foam concrete with the lower density level at curing time before 28d, while it becomes a common phase in 3d’s carbonated sample with the higher density level. Vaterite was considered to be an important factor that influences the ultrasonic transmission velocity.
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M.R, Aminur, Harunur M.R, Teo D.C.L, and Abu Zakir M.M. "Effect of aggregates and curing conditions on the compressive strength of concrete with age." Journal of Civil Engineering, Science and Technology 1, no. 2 (April 1, 2010): 1–6. http://dx.doi.org/10.33736/jcest.71.2010.
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The present research describes the effect of aggregate and curing condition on the compressive strength of concrete with age. Ordinary Portland cement, coarse sand and brick chips/pebble gravels were used as binder, fine aggregate and coarse aggregate respectively. The ratio of cement, sand and coarse aggregate was 1:2:4 by weight. Five different curing conditions namely, water curing (WC), self curing (SC), air dry curing (ADC), one-day delay curing (1-DC) and three-days delay curing (3-DC) were employed. Two types of concrete namely; concrete C1 (brick chips as coarse aggregate) and C2 (pebbles gravel as coarse aggregate) were prepared in this study. The physical and mechanical properties of aggregates and concrete were determined respectively. The results show that, the compressive strength of concrete is affected by the properties of the aggregate and also curing condition employed. It was found that, the concrete C1 and the normal water curing appeared to be better than concrete C2 and other types of curing condition.
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T. Senthil Vadivel, Dr, E. Giri Prasad Goud, S. Nagarjuna, M. Doddurani, and A. P. Geethu. "Behavioural Study on Self Curing Concrete Using Poly Ethylene Glycol and Silica Fume." International Journal of Engineering & Technology 7, no. 3.35 (September 2, 2018): 60. http://dx.doi.org/10.14419/ijet.v7i3.35.29148.
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Water has a major role throughout the life of the concrete, because it is a critical component in the mixing, curing and hardening. Water obtained by the curing of concrete maintains satisfactory moisture content in order to achieve the desired properties developing the concrete microstructure and pore structure and hence improves its durability and performance. But, good curing is not always practical in many cases. So attempts have been made to develop internal curing concrete in which internal – curing agent provides water internally which is distributed throughout the concrete matrix whereas plain concrete is completely dependent on surface curing which only penetrates concrete surface by a few millimeter. Keeping importance to this, an attempt has been made to develop internal-curing concrete by using Poly Ethylene Glycol (PEG-400). In this experimental analysis the strength characteristics of conventional concrete and self curing concrete, cast with the self-curing agent PEG-400 have been studied and compared. M30 grade of concrete is adopted using IS method of mix design. For the production of internal-curing concrete trial fractions of 1%, 2% and 3% of PEG-400 and silica fume of 15%, 18% and 20% by weight of cement was used and tested for different mechanical properties and found that 1% PEG at 20% silica fume is the optimal among all mixes.
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Luosun, Yi Ming, Jun Zhang, and Yuan Gao. "Evaluation of Shrinkage Resulted Cracking of High Strength Calcium Sulfoaluminate Cement Concrete with Impact of Internal Curing." Key Engineering Materials 629-630 (October 2014): 144–49. http://dx.doi.org/10.4028/www.scientific.net/kem.629-630.144.
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In this paper, restrained ring test and shrinkage test are carried on three kinds of concrete—high-strength portland cement concrete, high-strength calcium sulfoaluminate cement concrete and high-strength calcium sulfoaluminate cement concrete with internal curing in order to evaluate the shrinkage induced cracking performance of the concretes. The experimental results show that calcium sulfoaluminate cement concrete exhibits lower shrinkage caused by surface drying comparing to portland cement concrete. Internal curing can eliminate most of the autogenous shrinkage of concrete. In the ring test, the latter two concrete did not crack during the whole test history—42 days, while high-strength portland cement concrete cracked at the 13th day after casting. High strength calcium sulfoaluminate cement concrete exhibits better anti-cracking ability than the high strength portland cement concrete with the same strength grade.
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Adibah Ayuni Abd Malek, Nur, Khairunnisa Muhamad, Mohd Zulham Affandi Mohd Zahid, Nur Ain Hamiruddin, Norrazman Zaiha Zainol, Norhaizura Yahya, Nurulashikin Bahaman, and Nurfaraheen Mohd Ramli. "Evaluation of bond strength between normal concrete and high performance fiber reinforced concrete (HPFRC)." MATEC Web of Conferences 195 (2018): 01015. http://dx.doi.org/10.1051/matecconf/201819501015.
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High Performance Fiber Reinforced Concrete (HPFRC) has been proposed to be used as a repair material for the deterioration of concrete structure since its very low porosity that leads to a low permeability and high durability. This characteristic makes it suitable for rehabilitation and retrofitting reinforced concrete structures or for as a new repair material. The bond strength between HPFRC and old concrete should have a good bond strength, thus surface preparation method and curing method can help strengthen the bond strength between HPFRC and normal concrete. This paper was performed to study the effect of surface preparation and curing method on the bond strength between HPFRC and normal concrete. In this study, three surface preparations were prepared: sandblasting, grooved and drill hole. Then, the curing methods that were performed in this study are ambient curing and water curing. The tests that were conducted to evaluate the bond strength between HPFRC and normal concrete are slant shear test and splitting tensile test. The result from this study shows that sandblasting gave the highest bond strength result between normal concrete and HPFRC. For the curing method, water curing gives the highest bond strength between normal concrete and HPFRC.
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Abdelhalim, Benouis, and Mehamdia Ali. "The use of ultrasonic pulse velocity to estimate the water permeability of concretes." MATEC Web of Conferences 149 (2018): 01065. http://dx.doi.org/10.1051/matecconf/201814901065.
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In this work we investigated the possibility of estimating the water permeability of concrete from the ultrasonic surface wave velocity (Rayleigh's waves). This is a method for the non-destructive permeability diagnosis of the in situ auscultation of a structure. Four ordinary concrete compositions with different W/C ratios and two self compacting concretes SCC were used. This study showed a decrease in of ultrasonic pulse velocity with the increase in the W/C ratio, this is due to the increase in porosity. Curing in air of the concrete specimens produces greater permeability than curing in water. The increase in the permeability with the increase of W/C ratio is more important for curing in water than for the curing in air. SCC1 has a lower permeability than that of SCC2, this difference is respectively 20% and 10 % for curing in air and in water. The study show that permeability estimation with ultrasonic surface waves is more reliable for curing in water mode than tin curing in air. The correlations obtained between the permeability and the indirect ultrasonic velocity are linear, with an inversely proportional relation.
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Raza, Muhammad Saleem, Haresh Kumar, Danish Kumar, and Naraindas Bheel. "Effect of Various Curing Methods and Curing Days on Compressive Strength of Plain Cement Concrete." Quaid-e-Awam University Research Journal of Engineering, Science & Technology 18, no. 02 (December 31, 2020): 29–32. http://dx.doi.org/10.52584/qrj.1802.04.
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Concrete is the most important and most consumed construction material in global construction industry. The properties of concrete are greatly influenced by properties of its constituents and curing methods utilized for preparation of specimens. This study is focused on investigating the influence of three common curing methods, i.e., ponding, sprinkling and wet cover curing on compressive strength behavior of concrete. In total, 45 cubes were casted and tested after curing for 3, 7, 14, 28 and 56 days. The obtained results suggest that ponding method of concrete curing is most effective among all the three methods of concrete curing considered in this study. After ponding, the performance of concrete cured with wet cover curing method was quite acceptable. Moreover, the study also suggested that sprinkling method of curing gives lowest compressive strength due to greater moisture movement which abates the hydration of binder in concrete. This study will be helpful for construction practitioners in deciding the best-suited curing method under given conditions and available methods of preparation of concrete.
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Kastornykh, Lubov I., I. V. Trischenko, A. V. Kakljugin, and D. R. Shershen. "Heat Curing Efficiency Estimation of Concrete with Superplastificators on Polycarboxylates Basis." Materials Science Forum 974 (December 2019): 231–36. http://dx.doi.org/10.4028/www.scientific.net/msf.974.231.
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The influence of superplastificators on polycarboxylates basis upon forming concrete mechanical and physical properties was estimated under heat curing. Heat curing is most effective for rapid concrete hardening. But simultaneously with concrete strength development heat curing may cause destruction, decreasing the most important concrete properties. It was established that steam cured self-compacting concrete with superplastificators on polycarboxylates basis is most effective at low temperature heat curing conditions. The rational concrete heat curing temperature mode should be chosen according to quality parameters estimated during experiments.
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Parniani, Sasan, Mohd Warid Hussin, and Farnoud Rahimi Mansour. "Compressive Strength of High Volume Slag Cement Concrete in High Temperature Curing." Advanced Materials Research 287-290 (July 2011): 793–96. http://dx.doi.org/10.4028/www.scientific.net/amr.287-290.793.
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Recent consideration has been given to use of GGBFS as separate cementitious material mixed along with Portland cement in production of concrete. Problems are frequently encountered in producing good-quality concrete specially slag cement concrete in hot climates.Curing problems are exaggerated when concreting in hot weather, as a result of both higher concrete temperatures and increased rate of evaporation from the fresh mix. The disadvantage of GGBFS concretes is that they proved to be more sensitive to poor curing than OPC Therefore, special care must be taken when using this type of concrete, especially on site, where the working conditions and the application of curing are not as easy to control as in the laboratory concrete. The purpose of this paper is investigation and evaluation strength loss in slag cement concrete in poor curing situation. To carry out this aim, 72 cube specimens with three different proportion of slag are made and cured in two different conditions. And result of compressive tests compared together to determine susceptibility of GGBFS concrete in hot-dry condition.
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Kamaruzaman, Norul Wahida, and Khairunisa Muthusamy. "Effect of Curing Regime on Compressive Strength of Concrete Containing Malaysian Laterite Aggregate." Advanced Materials Research 626 (December 2012): 839–43. http://dx.doi.org/10.4028/www.scientific.net/amr.626.839.
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Concrete subjected to improper curing process would exhibit poor strength performance due to incomplete hydration process. This research investigate the effect of curing regime towards compressive strength of concrete containing Malaysian laterite aggregate (MLA) as partial coarse aggregate replacement. Concrete specimens produced using a range of laterite aggregate replacement from 0 to 50% were placed in different curing regime namely water curing, natural weather curing and air curing until the testing date. Specimens were subjected to compressive strength test in accordance to BS EN 12390 at 60 days. The results show strength of all specimens except the air cured samples increase as the curing age become longer. It was found that water curing is the most suitable for better performance of laterite concrete. The presence of water throughout the curing process is very much crucial for laterite concrete strength developement compared to normal concrete.
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Joshaghani, Alireza, and Dan G. Zollinger. "Assessment of Concrete Pavement Set Gradient Based on Analysis of Slab Behavior and Field Test Data." Transportation Research Record: Journal of the Transportation Research Board 2673, no. 6 (May 16, 2019): 512–23. http://dx.doi.org/10.1177/0361198119849900.
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This paper discusses how the set gradient in a jointed concrete slab is related to the cracking performance and its effects on fatigue crack model calibration. The role of curing quality on-set and how curing quality parameters are related to the set gradient is also discussed. To assess the impacts of curing practices on the set gradient of a newly constructed concrete slab, a field investigation was undertaken at the Florida Department of Transportation State Materials Office in Gainesville, Florida. This study investigated early age concrete pavement behavior with respect to the development of the set gradient. In this research, four test slabs were placed and cured under different conditions to create different states of stress and creep behavior during and after hardening of the concrete. Early age concrete temperature and moisture history are key factors that affect the slab curling and warping behavior as they pertain to the resulting set gradient. This paper elaborates on the details of the cracking performance data analysis of test data associated with the development of the set gradient.
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Bashandy, A. A. "Self-Curing Concrete under Sulfate Attack." Archives of Civil Engineering 62, no. 2 (June 1, 2016): 3–18. http://dx.doi.org/10.1515/ace-2015-0061.
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Abstract Self-curing concrete SC is a concrete type that can be cured without using any external curing regimes. It can perform by several methods such as using lightweight aggregate or chemical agents. In this research chemical curing agent is used to produce SC. This paper reports the results of a research study conducted to evaluate the effect of sulfates on the performance of self-curing concrete compared to ordinary concrete. Samples are immersed in sodium sulfate Na2SO4 solution of 4% concentration. Results are measured in terms of compressive strength, tensile strength, flexural strength and mass loss. It was found that the rate of strength loss is noticed at ordinary concrete compared to SC concrete. Sulfate resistance is improved when using self-curing concrete. This improvement appears to be dependent on using a chemical curing agent.
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Rostami, Vahid, Yixin Shao, and Andrew J. Boyd. "Carbonation Curing versus Steam Curing for Precast Concrete Production." Journal of Materials in Civil Engineering 24, no. 9 (September 2012): 1221–29. http://dx.doi.org/10.1061/(asce)mt.1943-5533.0000462.
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Zheng, Yuanxun, Weixing Kong, Mengen Ji, Chao Wan, and Ehsan Moshtagh. "Experimental investigation of concrete strength curve based on pull-out post-insert method." International Journal of Distributed Sensor Networks 16, no. 7 (July 2020): 155014772094402. http://dx.doi.org/10.1177/1550147720944021.
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As concrete is a building material that is widely used in the field of infrastructure construction, and its quality is related to the quality and service life in infrastructure engineering, concrete strength is an important reference index that reflects the concrete quality. Based on this, two commercial concretes A and B are selected in Henan Province, China, to perform the concrete strength test under same condition curing and standard condition curing in the pull-out post-insert method, cubic compression, rebound method, and drilling core method. The relationships between the different curing conditions, cubic compressive strength, core sample strength, rebound strength, and pull-out force of different commercial concretes are compared and analyzed. Through a comparative analysis and while considering the convenience and accuracy requirements, the strength curves of the two different concretes based on the pull-out post-insert method were fitted and analyzed, and the local strength curve test in Henan based on the pull-out post-insert method was established. The research results provide technical support for evaluating the strength of concrete structures using the pull-out post-insert method, which has important engineering significance for improving the popularize and application of the pull-out post-insert method.
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Rath, Badrinarayan, Shirish Deo, and Gangadhar Ramtekkar. "Curing: The easiest and cheapest method to increase the durability and strength of concrete." Facta universitatis - series: Architecture and Civil Engineering 16, no. 3 (2018): 475–87. http://dx.doi.org/10.2298/fuace180919023r.
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Curing is a process which follows immediately after placing and finishing of concrete. It maintains a satisfactory moisture content and temperature in concrete for a period of time so that the desired properties may develop. Curing has a strong influence on the properties of hardened concrete. With proper curing concrete becomes stronger, more impermeable, and more resistant to stress, abrasion, and freezing and thawing. Using of fiber in concrete may improve these properties but it increases the cost of concrete. This paper reports the results of a study conducted to assess the effect of ages of curing on durability and strength of fiber and non fiber reinforced concrete. Also a comparative study of cost per unit strength and cost per unit service life period is done in between fiber reinforced concrete and non fiber reinforced concrete with proper curing. The concrete cubes were prepared by varying three water cement ratios and by curing them for a different number of curing days. Bulk electrical resistivity test, ultrasonic pulse velocity test, compressive strength test, flexural strength test and carbonation depth test of the cured cubes were performed. From the test results it is found that proper curing of traditional concrete is more economical than fiber reinforced concrete in achieving the same strength and durability.
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Lo, King-Chi, Heung-Wing Terry Kwok, Ming-Fung Francis Siu, Qiping Geoffrey Shen, and Chi-Keung Lau. "Internet of Things-Based Concrete Curing Invention for Construction Quality Control." Advances in Civil Engineering 2021 (June 7, 2021): 1–13. http://dx.doi.org/10.1155/2021/9933615.
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The efficiency of the traditional concrete curing process on site is low, due to the difficulties in providing continuous supervision and control of the curing environment, leading to considerable variation in the curing regimes experienced by different concrete pours. To enhance concrete curing practice, technologies have been harnessed which eliminate human involvement enabling more rigorous control of the environmental conditions affecting curing, but the potential for Internet of Things (IoT) technologies had yet to be explored in this context. This research study examined an IoT-based concrete curing control system based on sensor technologies invented for monitoring and controlling the moisture content of hardening concrete to the levels appropriate for good quality hardened concrete. Based on on-site experiments, the performance of this IoT-based method was compared with the performance of traditional curing methods. The results indicate that the system invented outperforms the traditional approach both in terms of concrete curing quality and time spent on supervision.
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Whiting, Nancy M., and Mark B. Snyder. "Effectiveness of Portland Cement Concrete Curing Compounds." Transportation Research Record: Journal of the Transportation Research Board 1834, no. 1 (January 2003): 59–68. http://dx.doi.org/10.3141/1834-08.
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Many different spray-on compounds are available for curing concrete, including newer products that are intended to address the environmental concerns associated with high volatile organic compound (VOC) contents. A laboratory study was conducted to examine the effectiveness of different types of curing compounds in retaining water for hydration, promoting concrete strength, and reducing permeability, relative to classic curing techniques such as plastic sheeting and ponding and relative to the use of no curing treatment. Comparisons of moisture loss, compressive strength, permeability, and capillary porosity were made for samples representing three high-VOC curing compounds, three low-VOC curing compounds, water curing, and plastic-sheet curing, and for samples with no curing treatment after 3 days and 28 days of curing. The performance of the six compounds tested varied greatly, but none of the compounds performed as well as the samples cured with water or plastic sheeting. All compounds performed better than samples with no curing treatment.
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Zulkiflee, Normarliana, and Ahmad Zurisman Mohd Ali. "The Development of Geopolymer Concrete Mix and Portable Steam Curing Technique." E3S Web of Conferences 65 (2018): 02009. http://dx.doi.org/10.1051/e3sconf/20186502009.
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Geopolymers concrete is environmental-friendly constructions material utilizing waste as the main ingredient in a concrete binder. Various properties of heat-cured geopolymer concrete have shown its suitability for applications such as precast concrete structure. However, the heat-cured method for geopolymers such as steamer generator and a dry-air oven is limited due to the curing system is not mobilized and it is an industrial form. Thus, these types of curing system is not suitable for cast in situ applications. Based on the study carried out, new finding will be proposed to determine the effectiveness of portable steam curing as the new alternative curing technique for geopolymer concrete. Engineering properties of Class F fly ash based geopolymer concrete after curing with portable steam curing method are study and the corresponding results will be compared with the oven curing method. At the end of the research, the portable steam curing method can offer the effectiveness of geopolymer concrete for cast-in-situ alternatives. Besides, the maximum compressive strength of geopolymer concrete with a portable steam curing can be achieved within 24 hours at 80°C.
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Bredenkamp, S., K. Kruger, and G. L. Bredenkamp. "Direct electric curing of concrete." Magazine of Concrete Research 45, no. 162 (March 1993): 71–74. http://dx.doi.org/10.1680/macr.1993.45.162.71.
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Khaliq, Wasim, and Waqas Javaid. "Characterization of Conventional and Modern Curing Techniques in Concrete." Key Engineering Materials 711 (September 2016): 1118–25. http://dx.doi.org/10.4028/www.scientific.net/kem.711.1118.
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Appropriate curing of concrete is of vital importance in development of desired material properties in concrete namely compressive strength, durability, and dense uniform microstructure. Improper and intermittent curing is considered as one of the major reasons for concrete failures as evident in the form of cracks that consequently lead to durability issues of structures. An experimental program was designed to study the behavior of concrete under various conventional and modern curing techniques. Numerous cylindrical specimens were tested with different conventional and modern curing techniques to quantify their effects on curing of concrete. Microstructural and compressive strength development analyses at different ages were conducted to monitor the effect of curing methods. This work is helpful in establishing the best curing techniques for attainment of compressive strength and durability in concrete.
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Lu, En Li, Guo Li, Ying Shu Yuan, Ou Geng, and Jian Min Du. "Studies about the Initial Curing Conditions on the Carbonation Resistance of Fly-Ash Concrete." Advanced Materials Research 250-253 (May 2011): 920–24. http://dx.doi.org/10.4028/www.scientific.net/amr.250-253.920.
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Studies about the resistance of carbonation capability of fly-ash (FA) concrete at different initial curing regimes and exposure time through accelerated carbonation experiments were made. Firstly, 30% replacement ratio fly-ash concrete specimens were fabricated and cured in 20°C, 30°C and 40°C water for 3d, 7d, 14d and 28d respectively, and cured in a standard air environment (20±2°C, relative humidity ≥95% ) for 28d. As a comparison, ordinary Portland concrete (OPC) specimens were also made and cured in 30°C water for 7d, and standard curing for 28d. After the initial curing, all the specimens were taken out and placed indoor natural environment. When specimen age reach 30d, 60d and 120d, 2 weeks accelerated carbonation experiments were made and concrete carbonation depth were measured. In addition to this, hydration degrees of fly ash at different initial curing conditions were measured using the selective dissolve method. Results show that the initial curing conditions play an important role in the carbonation resistance of FA concrete. Initial water curing is beneficial to the development of carbonation resistance of FA and OPC concrete. Prolonging initial curing time and increasing curing temperature is beneficial for the carbonation resistance of FA concrete. For the same curing conditions, carbonation rate of FA concrete is usually higher than OPC concrete, but with the increase of initial curing temperature, the difference can be reduced.