Journal articles: 'Admixture(concrete)'

1

Fujio, Yamato, Fujita Shuich, Tanisho Yoshiaki, Kitagawa Kazushige, and Satoh Haruyuki. "5707445 Admixture for concrete." Cement and Concrete Composites 21, no. 3 (January 1999): 241. http://dx.doi.org/10.1016/s0958-9465(99)90106-3.

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Ru, Songnan, Zuozhou Li, Handong Liu, Huaichang Yu, Chunlei Wei, Guangzhu Hu, Fangfang Xue, Congxian Wang, and Jialiang Wang. "Experimental Study of a New Concrete Admixture and Its Function in Filling and Reinforcing Granite Fissures." Geofluids 2021 (September 3, 2021): 1–9. http://dx.doi.org/10.1155/2021/8587258.

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A concrete admixture with water retention and superhydrophobic properties was developed according to the high tensile strength, fissure resistance, and antiseepage requirements of concrete linings. Capillary water absorption, early-age anticracking, cube compressive strength, and splitting tensile tests were employed to study the effects of the new concrete admixture on the basic performance of concrete. On this basis, a triaxial compression test was conducted on granite fissures filled with concrete containing the admixture; the stress-strain and failure characteristics under different admixture dosages, confining pressures, and fracture widths were analyzed, and the reinforcement effect of the concrete with the admixture on the fractured rock mass was studied. The results show that the admixture can effectively improve the ability of concrete to resist water and fissures, and the concrete with the admixture significantly reinforced the fractured rock mass. Therefore, it can be widely applied in filling and reinforcing fractured rock masses.

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Luo, Mei Fang. "Study on Effects of Concrete Admixtures on Performance of Concrete." Applied Mechanics and Materials 94-96 (September 2011): 856–59. http://dx.doi.org/10.4028/www.scientific.net/amm.94-96.856.

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Concrete admixture is a kind of addition agents, which can improve the performance of concrete. Adding a certain amount of concrete admixture can enhance the early strength, the age strength, and the anti-permeability strength of concrete. Also, concrete admixtures can improve the workability and adjust the setting time of concrete, so as to reduce the dosage of concrete and save the cost of concrete. This paper describes the types of concrete admixture and their functions, studies the functions of water reducers, and analyzes their effects to concrete, so as to improve the concrete performance and save materials in actual operation.

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Fedorova, Galina D., Gregory N. Alexandrov, Grigory I. Yakovlev, Irina S. Polyanskikh, and Igor A. Pudov. "Fine Grain Portland Cement Concrete with Complex Nanodisperse Admixture for Structure Rehabilitating." Advanced Materials Research 1122 (August 2015): 105–10. http://dx.doi.org/10.4028/www.scientific.net/amr.1122.105.

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The influence of new complex nanodisperse admixture on structure and strength characteristics of fine grain concrete used in rehabilitation of damaged concrete structures has been studied. Concrete without the admixture is more susceptible to cracking than concrete with the complex admixture, thus increasing the working time of structures. At the age of 28 days the compressive strength of fine grain concrete with the admixture reaches 52,35 MPa, the flexural strength is 5,2 MPa. The strength characteristics of concrete increased by 15%.

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Zhao, Mei Li, Ai Xiang Li, Lin Tong Wang, and Yun Fa Chen. "The Study on Chloride Corrosion of Concrete Containing Admixture Mineral." Applied Mechanics and Materials 174-177 (May 2012): 1269–72. http://dx.doi.org/10.4028/www.scientific.net/amm.174-177.1269.

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Chloride ions were harmful to the performance of the concrete.Admixture mineral had been replaced part of cement in high performance concrete to improve the durability and chloride resistance of the concrete.In this paper,the compressive strength of the concrete with admixture mineral and without admixture mineral had been measured cured after 28 days. The results had been shown that the compressive strength of the concrete without admixture mineral is lower than the one with admixture mineral after 28ds’and 56ds’ immersing in 5%NaCl solution. The quantities of electricity through the concretes with 30% admixture mineral were lower than the benchmark concretes. The current of C30 and C40 concretes with admixture mineral was lower than the benchmark concretes.The concrete with admixture mineral had been eroded lower than the one without admixture mineral.

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Zheng, Yu Xian, and Xun Guo Zhu. "The Influence on the Concrete Durability in Bleed Air Performance Caused by Concrete Admixture." Advanced Materials Research 690-693 (May 2013): 767–70. http://dx.doi.org/10.4028/www.scientific.net/amr.690-693.767.

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The article issued the influence on concrete durability caused by concrete admixture, based on the further study on concrete admixture bleed air performance test, and researched the influence on concrete durability caused by it. The experiments show that the admixtures of air-entraining performance improve internal pore structure of concrete and increase the compacting condition concrete. Concrete admixture also can improve the impermeability of concrete frost resistance and improve the resistance to environmental actions, and proposed concrete air content of the Dalian region suitable value.

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Nagashio, Y., and A. Sugiyama. "Concrete with Rapid Hardening Admixture." Concrete Journal 57, no. 1 (2019): 63–66. http://dx.doi.org/10.3151/coj.57.1_63.

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Wang, Qiang, Pei Yu Yan, and Reng Guang Liu. "Effects of Blended Steel Slag-Superfine Fly Ash Mineral Admixture and Ordinary Fly Ash on the Properties of Concrete." Materials Science Forum 743-744 (January 2013): 323–28. http://dx.doi.org/10.4028/www.scientific.net/msf.743-744.323.

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The effects of blended steel slag-superfine fly ash mineral admixture and ordinary fly ash on the properties of concrete were compared in this study. The results show that, in the case of the same adding amount, blended steel slag-superfine fly ash mineral admixture and ordinary fly ash have similar effects on the early strength and chloride ion permeability of concrete. Blended mineral admixture has higher ability to improve the late strength of concrete than ordinary fly ash. Paste and concrete containing blended mineral admixture have smaller porosities than that containing ordinary fly ash. Blended steel slag-superfine fly ash is an ideal mineral admixture for concrete.

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Zong, Xiang. "Research on the Application of Compound Admixture in the Freezing Mine Shaft Lining Concrete." Advanced Materials Research 250-253 (May 2011): 1252–55. http://dx.doi.org/10.4028/www.scientific.net/amr.250-253.1252.

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In order to achieve the setting and hardening of mine shaft lining concrete under the minus temperature in freezing construction and to meet the demands of every performance of concrete, the technique of compounding air entraining admixture and antifreezing admixture and early strength water reducing admixture was applied in this research. Based on the orthogonal experimental design, several mix proportions of compound admixture for early strength liquid mine shaft lining concrete were developed in the laboratory. The data collected in this research provide reference for the optimum mix proportion of the adulteration quantity of the concrete admixture. The results show that the 2.1％ amount of compound antifreezing admixture achieves favorable effects of liquid, early strength, freezing prevention and antifreezing.

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Zhao, Mei Li, Su Qing Wang, and Ai Xiang Li. "The Study on Sulfate Resistance of Concrete Containing Admixture Mineral." Applied Mechanics and Materials 174-177 (May 2012): 1265–68. http://dx.doi.org/10.4028/www.scientific.net/amm.174-177.1265.

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Admixture mineral has been replaced part of cement in high performance concrete to improve the durability and sulfate resistance of the concrete.In this paper,the compressive strength of the concretes with adimixture mineral and without admixture mineral had respectively measured after 28ds’ standard curing.Then the concretes had been immersing in NaSO4 solution and MgSO4 solution.The compressive strength of the concrete with admixture mineral and without admixture mineral has been measured after 28ds’and 56ds’ immersing in NaSO4 solution and MgSO4 solution. The concrete with admixture mineral had been eroded lower than the one without admixture mineral after 28 days and 56 days.

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Zhou, Jian Mei, and Run Xia Hao. "Effect of Shrinkage Reducing Admixture on Properties of Pumping Concrete." Advanced Materials Research 472-475 (February 2012): 565–69. http://dx.doi.org/10.4028/www.scientific.net/amr.472-475.565.

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In order to improve the crack resistance of pumping concrete, effect of shrinkage reducing admixture on the performance of pumping concrete was stuied, the results showed that dry shrinkage decreased obviously when shrinkage reducing admixture was added into pump concrete , and 28d shrinkage can be reduced by over 40% when the dosage of shrinkage reducing admixture was 1.5% , while the shrinkage reducing admixture can significantly improve the fresh pumping concrete workability, improve compressive strength of 28d, but the flexura strength decreases slightly.

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Yang, Ding Yi, Hao Li, Han Yue, Li Jie Ge, and Wen Hua Wang. "Research on Nickel Slag Powder as Concrete Mineral Admixture." Advanced Materials Research 1065-1069 (December 2014): 1825–32. http://dx.doi.org/10.4028/www.scientific.net/amr.1065-1069.1825.

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s. Using industrial waste residue as concrete mineral admixture has become a direction of the development of the green concrete. Nickel slag is mainly introduced, and the chemical composition and preparation of nickel slag powder, and study its physical properties, activity, volume stability and mechanical properties. According to nickel slag powder admixture amount of replacing cement, admixture fineness, mixed with admixture of concrete changes between the intensity of the three, put forward suitable fineness of slag powder and nickel content of concrete.

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Yu, Le Hua, Hui Ou, and Shuang Xi Zhou. "Preparation of Railway Concrete Sleeper Blended with Perlite Admixture." Advanced Materials Research 139-141 (October 2010): 247–50. http://dx.doi.org/10.4028/www.scientific.net/amr.139-141.247.

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The experimental data about concrete incorporating perlite admixture revealed that perlite admixture in content of 10%-20% replacing cement in equal mass enhanced effectively the workability, late-age mechanical strength and durability for concrete. The railway sleepers made of concrete with perlite admixture substituting for 20% cement were probingly produced in production line of manufactory without any modification to the conventional equipment or procedures. The summary was concluded that the concrete sleepers with 20% perlite admixture not only have met requirement of product quality, but also far better than demand of product quality on fatigue resistance, meanwhile prior to reference concrete sleepers without mineral admixture on major properties, such as fracture resistance. Consequently, the concrete sleeper considerably requires less maintenance and offers a longer service and reduced life-cycle costs.

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Song, Shao Min, Xiao Lun Wang, and Lin Wang. "Properties of Concrete with High-Volume Limestone Powder as Composite Mineral Admixture." Applied Mechanics and Materials 193-194 (August 2012): 351–59. http://dx.doi.org/10.4028/www.scientific.net/amm.193-194.351.

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This paper studies the effects of high-volume composite mineral admixture made of limestone powder and low-quality fly ash on the properties of concrete. Through experiments, this paper makes clear the workability of fresh concrete and analyzes the law of strength development of concrete. The experimental results indicate that the concrete with high-volume limestone powder as composite mineral admixture has good fresh properties; due to low water consumption per unit volume, medium-and-high-strength concrete can be prepared. As new type concrete mineral admixture, the composite mineral admixture made of limestone powder and low-quality fly ash will play an active role in the sustainable development of concrete industry.

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15

Zhang, Wei, Xiao Yao, and Ru Mu. "Improvement of Resistance of Concrete Against Chloride Ingression Using a New Admixture." Advanced Materials Research 415-417 (December 2011): 1496–502. http://dx.doi.org/10.4028/www.scientific.net/amr.415-417.1496.

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This paper studies a new admixture used to improve the resistance of concrete against the chloride penetration. The minerals blends, e.g., fly ash and GGBFS, can significantly improve the resistance of concrete against chloride penetration, which is one of the main reasons causing the corrosion of rebar in concrete. Another measure used to recover the resistance of rebar against corrosion is corrosion inhibitor. The new admixture investigated herein is fabricated by combination of corrosion inhibitor and mineral additive to form a new admixture. One of the typical composition of the new admixture is (in mass percentages) with calcium nitrite 20%~30%, calcined gypsum 15%~20%, instant layered sodium metasilicate 5%~10%, hexamethylene tetramine 3%~5%, sodium tripolyphosphate 1%~3%, water reducer 0% ~20%, AEA 0% ~ 0.4% (optional) and fly ash. Series of tests have been carried out to verify the performance of the new admixture. The results showed that by adding the new admixture with mass dosage of 3~5% of the cementitious materials into concrete, the penetration of chloride of chloride into concrete is significantly slowed down. Also, the new admixture is compared with conventional products experimentally and it is proved that the new admixture does have advantage in the resistance against corrosion of steel bars in concrete.

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16

Zhao, Mei Li. "The Effects of Mineral Admixture on the Compressive Strength of Concrete." Advanced Materials Research 450-451 (January 2012): 263–66. http://dx.doi.org/10.4028/www.scientific.net/amr.450-451.263.

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Mineral admixture was one or more industrial waste, or mixed with finely ground natural minerals, or grinded mixture.By replacing part of the cement with mineral admixtures , cement could be saved and improved the performance of concrete. In this paper，the compressive strength and slump of the concrete with mineral admixture were tested. The amount of cement replaced by mineral admixture in the concrete affected the compressive strength and the slump. According to the compressive strength and slump of the concrete, the optimum dosage of the mineral admixture was from 30% to 40%.

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Gadgihalli, Vishal, Ramya, Abrar Khan, Ranjitha, and Babitha Rani. "ANALYSIS OF PROPERTIES OF CONCRETE USING CRUSHED GLASS POWDER AS ADMIXTURE." International Journal of Research -GRANTHAALAYAH 5, no. 4RASM (April 30, 2017): 54–58. http://dx.doi.org/10.29121/granthaalayah.v5.i4rasm.2017.3369.

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Concrete admixture is added to enhance the properties of concrete to make its function as required. In this paper analysis of properties of concrete using of glass powder as admixture to concrete is studied and verified the strength of concrete and temperature emitted due to chemical reaction to the normal Portland cement. Using of glass powder as admixture the temperature emitted due to exothermal reaction of concrete has reduced. As glass has property of absorbing high temperature. This gives better results hence we can use this glass powder as an admixture. Where the reacting temperature and the emitting temperature place a crucial role in construction, and as glass powder is rigid and non-crystalloid solid this increase bond strength in concrete to increase its strength.

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V, Boopathi, and Sharmila Devi K. "Durability Study on Self Compacting Concrete with Mineral Admixture." International Journal of Trend in Scientific Research and Development Volume-3, Issue-3 (April 30, 2019): 1790–97. http://dx.doi.org/10.31142/ijtsrd23226.

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Xie, Jian Bin, Tian Chun He, Yong Ping Ai, and Guo Jin Ji. "Study on the Properties of Mass Hydraulic Concrete with Admixtures of Limestone Powder and Water Quenched Iron Slag." Advanced Materials Research 255-260 (May 2011): 3573–78. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.3573.

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For mass concrete with the admixtures of limestone powder and water quenched iron slag (shortly called double admixture concrete) in dam of Jinghong hydropower station located at the downstream of Lancang river in Yunnan province, the mineral composition of double admixture was analyzed in this paper. And it is also studied by materials testing and microscopic analysis methods such as laser particle analysis, scanning electron microscopy, energy spectrum analysis, X-ray diffraction analysis and thermo gravimetric-differential thermal analysis that the hydration, hydrated product and mechanism of hydration process in the system of cementing and double admixture material system. Then the mechanical, thermal and deformation properties and the durability of the concrete with double admixtures were also analyzed by experimental methods. The study results show it was theoretically feasible that adopting the double admixtures as the admixture of the mass hydraulic concrete which can be roller compacted concrete or normal concrete. And the properties of the double admixture concrete in Jinghong hydropower station meet all kind requirements.

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Pazderka, Jiří, and Eva Hájková. "CRYSTALLINE ADMIXTURES AND THEIR EFFECT ON SELECTED PROPERTIES OF CONCRETE." Acta Polytechnica 56, no. 4 (August 31, 2016): 306–11. http://dx.doi.org/10.14311/ap.2016.56.0306.

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There have been many experimental measurements of the waterproofing ability and durability of concrete with a crystalline admixture, but some other important properties have not been reliably tested yet. The results of the tests, carried out by the authors, showed that crystalline admixtures reduce the water vapor permeability of concrete by 16-20 %. The authors also carried out the water pressure test in different time intervals, during the initial phase of cement hydration. The test results have shown that the full waterproofing effect of concrete with a crystalline admixture is available approximately on the 12th day after the concrete creation. The crystalline admixture effect on the compressive strength of concrete was also the subject of the testing. The results have shown that the compressive strength of the concrete with a crystalline admixture (added in an amount of 2 %) and the compressive strength of the specimens from concrete without admixture were almost identical after 28 days.

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Wang, Yuan, Da Li Zhang, and Cui Hong Chen. "Study and Application of Salt-Scaling Resistant Admixture in Concrete." Key Engineering Materials 405-406 (January 2009): 361–66. http://dx.doi.org/10.4028/www.scientific.net/kem.405-406.361.

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This paper investigated a new type of admixture which can be used to enhance the resistance of concrete surface to deicing salt deteriorating. Physical and mechanical properties of concrete incorporating this salt-scaling resistant admixture were measured. Practical application on site has proved that this admixture is effective for concrete to resist salt-scaling action.

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Wang, Yuan, and Bin Liu. "Study and Application of Salt-Scaling Resistant Admixture in Concrete." Key Engineering Materials 302-303 (January 2006): 105–10. http://dx.doi.org/10.4028/www.scientific.net/kem.302-303.105.

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This paper investigated a new type of admixture which can be used to enhance the resistance of concrete surface to deicing salt deteriorating. Physical and mechanical properties of concrete incorporating this salt-scaling resistant admixture were measured. Practical application on site has proved that this admixture is effective for concrete to resist salt-scaling action.

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Gadgihalli, Vishal, Ramya, Abrar Khan, Raghavendra Prasad Dinakar, and Babitha Rani. "ANALYSIS OF PROPERTIES OF CONCRETE USING HUMAN HAIR LENGTH GREATER THAN 10CENTIMETER DIPPED IN SALT WATER AS FIBER REINFORCEMNT ADMIXTURE." International Journal of Research -GRANTHAALAYAH 5, no. 4RASM (April 30, 2017): 50–53. http://dx.doi.org/10.29121/granthaalayah.v5.i4rasm.2017.3368.

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Admixtures now days play a predominant role in concrete manufacturing. The admixtures ranged from blood in history to fiber reinforcement admixture. In this paper the author analyzing the properties of concrete using salt water cured and oven dried human hair whose length exceeding 10cm as fiber reinforced admixture is studied and verified by strength of ordinary Portland cement without using any admixture. Using human hair length greater than 10cm as fiber reinforcement admixture gave good percentage of increment in compressive strength and flexural strength, but as the length of the human hair increases used for concrete as fiber reinforcement admixture reduces the strength.

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Magdaluyo Jr., Eduardo, Lorenz Charles E. Aterrado, Jared Christian B. Paz, and Ivy Rose B. Gonzales. "Fabrication of High Strength Concrete from Recycled Concrete Aggregate Utilizing Taguchi Method." Applied Mechanics and Materials 789-790 (September 2015): 1109–13. http://dx.doi.org/10.4028/www.scientific.net/amm.789-790.1109.

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The preparation of concrete mixtures can be tailored to provide wide range of mechanical and durability properties as well as to meet the design specifications of the structure. This paper discusses the potential use of recycled concrete aggregate in the production of high strength concrete. The effect of other processing parameters such as aggregate replacement ratio, type of admixture and slump height on the compressive strength and water absorption rate of different concrete mixes were investigated. The fabrication of high strength concrete was done by machine-mixing of the aggregates, cement and admixture in accordance with ASTM C192, utilizing the Taguchi design to derive the concrete mixtures. Using the 10% recycled fine aggregate with Mira P99 admixture and slump height of 4-6 inches showed an optimum condition and yielded a predicted maximum compressive strength at around 8400 psi. The failure mode of the concrete after compression test was generally shear fracture type. For the water absorption rate, only the admixture had a significant effect. Surface morphology of the fractured concrete surface revealed that utilizing recycled concrete aggregate resulted to a porous surface morphology compared to the natural aggregate.

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Chen, Ai Jiu, Jing Wang, Zhan Fang Ge, and Ming Wu. "Permeability of Anti-Chloride Ion of Fly Ash Recycled Concrete." Advanced Materials Research 317-319 (August 2011): 544–47. http://dx.doi.org/10.4028/www.scientific.net/amr.317-319.544.

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Adding fly ash to recycled concrete with super-substitute technique, comparing the 28d strength of fly ash recycled concrete(FARC) with the 28d strength of ordinary recycled concrete(ORC), the compressive strength of fly ash recycled concrete slightly decreased with the increase of the fly ash and the admixture of renewable aggregate. Along with the increase of mixing amount of the air entraining and water-reducing agent, the compressive strength of fly ash recycled concrete tends to reduce. The order of the factors that affect the chloride ion diffusion coefficient of recycled concrete is fly ash admixture→mixing amount of the air entraining and water-reducing agent→admixture of recycled coarse aggregate→polypropylene fibre admixture, which provides a basis for the application of recycled concrete engineering in the environment which is affected by chlorine salt in the north frigid area .

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Gadgihalli, Vishal, Meena, Sindhu Shankar, and Raghavendra Prasad Havanje Dinakar. "ANALYSIS OF PROPERTIES OF CONCRETE USING DRIED BANANA PEEL POWDER AS ADMIXTURE." International Journal of Research -GRANTHAALAYAH 5, no. 11 (November 30, 2017): 351–54. http://dx.doi.org/10.29121/granthaalayah.v5.i11.2017.2367.

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Ingredients other than cement, water& aggregates that import a specific quality to either plastic(fresh)mix or the hardened concrete (ASTMC 496) is called concrete admixture. In this paper analysis of properties of concrete using banana peel as admixture is studied and verified the strength of concrete and temperature emitted due to chemical reaction to the normal Portland cement. As banana’s peel is rich in natural fiber and it is well known source of potassium. The flexural strength of concrete by using banana peel powder as admixture has increased, but considerable lesser compressive strength has increased. The percentage of transmission temperature and reduction time of temperature has decreased; hence it is clear that the exothermal reaction in concrete has been reduced by using dried banana peel powder as admixture.

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Zou, Si Yu, Ran Huang, An Cheng, Wei Ting Lin, and Jia Liang Chang. "Microstructure and Mechanism of Concrete Using Inorganic Silicate Admixture." Applied Mechanics and Materials 284-287 (January 2013): 1235–41. http://dx.doi.org/10.4028/www.scientific.net/amm.284-287.1235.

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The study evaluates the properties of concrete mixed with inorganic silicate admixture. The admixture was used in proportions of 3%, 5%, and 7% of the weight of the cement. We performed tests on compressive strength and elastic modulus to evaluate the mechanical properties of concrete. Results show that the addition of the inorganic silicate admixture has a positive influence on the mechanical properties of concrete, with the best results obtained with 3% admixture. MIP porosity measurements determined that the addition of inorganic silicate admixture increased the density of the porous structure. SEM microscopic analysis revealed many needle-like protrusions into the porous structure of concrete. XRF chemical composition analysis indicated that these structures comprised mainly Na2O and SiO2. Can with cement hydration products Ca(OH)2 bring in Chemical reaction. Inferred pore structure Within be C-S-H gel of needle-like protruding structure. it can improve the main cause of mechanical properties of concrete.

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Nagrockienė, Džigita, Giedrius Girskas, Gintautas Skripkiūnas, and Aurelijus Daugėla. "PROPERTIES OF CONCRETE MODIFIED BY AMORPHOUS ALUMINA SILICATE." Engineering Structures and Technologies 6, no. 4 (March 27, 2015): 178–83. http://dx.doi.org/10.3846/2029882x.2015.1016314.

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Concrete is the most widely used building material obtained by hardening the mix made of coarse and fine aggregates, cement as the binding material, and water. The basic properties of concrete depend on the quality and properties of cement, w/c ratio and the homogeneity of compaction. Compressive strength is one of the most important properties of concrete. Materials used: Portland cement CEM I 42.5 R, 0/4 fraction sand, 4/16 fraction gravel, amorphous alumina silicate admixture, polycarboxylate ether-based superplasticizer Muraplast FK 63.30, and tap water. Five compositions of concrete mixes containing 0%, 2.5%, 5%, 7.5% and 10% of amorphous alumina silicate admixture by mass of cement were produced. The article analyses the effect of amorphous alumina silicate on the properties of concrete depending on the admixture content. The results revealed that the compressive strength of concrete after 7 days of curing increased by 7.1%, after 28 days of curing increased by 13.3% when the amorphous aluminum oxide doped silicate content was increased to 10%. Amorphous alumina silicate admixture added in quantities of up to 10%, increased the density of hardened concrete by 0.75%, and ultrasonic pulse velocity in specimens with the admixture increased up to 2.63%.

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Jackiewicz-Rek, W., J. Kuziak, and B. Jaworska. "Analysis of the Properties of Expansive Concrete With Portland and Blast Furnace Cement." Archives of Civil Engineering 64, no. 4 (December 1, 2018): 175–96. http://dx.doi.org/10.2478/ace-2018-0051.

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AbstractThe properties of expansive concretes made of two types of cement: Portland cement CEM I and blast furnace slag cement CEM III were tested. The expansion of the concrete was caused by using an expansive admixture containing aluminium powder added in an amount of 0.5; 1 and 1.5% of cement mass. It was found that the compressive strength of concrete with CEM I decreased after using an expansive admixture in the amount of more than 0.5% of the cement mass. The compressive strength of concrete with CEM III decrease after addition of admixture in the entire range of dosages used. On the basis of electrochemical measurements, it was found no influence of an expansive admixture on corrosion of reinforcing steel. The use of an expansive admixture causes a slight increase in the effective diffusion coefficient of chloride ions in concrete.

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Toda, K. "My Life with Concrete Chemical Admixture." Concrete Journal 50, no. 3 (2012): 269. http://dx.doi.org/10.3151/coj.50.269.

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Elinwa, Augustine Uchechukwu. "Admixture Applications in Large Concrete Pours." Journal of Materials in Civil Engineering 6, no. 3 (August 1994): 352–56. http://dx.doi.org/10.1061/(asce)0899-1561(1994)6:3(352).

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OKAMURA, HAJIME, and KAZUMASA OZAWA. "MC as an Admixture for Concrete." Sen'i Gakkaishi 48, no. 10 (1992): P557—P560. http://dx.doi.org/10.2115/fiber.48.10_p557.

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Benson, Ronald E., Henry W. Chandler, and Kenneth A. Chacey. "Hazardous Waste Disposal as Concrete Admixture." Journal of Environmental Engineering 111, no. 4 (August 1985): 441–47. http://dx.doi.org/10.1061/(asce)0733-9372(1985)111:4(441).

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Pazderka, Jiří. "The Crystalline Admixture Effect on Concrete and Cement Mortar Compressive Strength." Key Engineering Materials 722 (December 2016): 87–91. http://dx.doi.org/10.4028/www.scientific.net/kem.722.87.

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There have been many experimental measurements of the waterproofing ability of concrete with a crystalline admixture. For the comprehensive evaluation of crystalline admixtures, it is necessary to consider their effect on the compressive strength of concrete fck, not only their waterproofing ability. The paper describes laboratory testing which subject was the selected crystalline admixtures effect on the compressive strength of concrete fck. The results have shown that the compressive strength fck,cubeof concrete with a crystalline admixture (added in an amount of 2%) was almost identical to the specimens from concrete without admixture after 28 days. The compressive strength of the next specimens from cement mortar with a smaller amount of a crystalline admixture (1%) after the 28 days was higher than the strength of the specimens without admixtures.

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Yang, Ben Ju, Qiu Yi Li, Song Gao, and Tao Li. "Research on Sulfate Attack Resistance of Concrete with Sulfate Corrosion-Resistance Admixture." Applied Mechanics and Materials 71-78 (July 2011): 3562–65. http://dx.doi.org/10.4028/www.scientific.net/amm.71-78.3562.

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A concrete sulfate corrosion-resistance admixture is developed with anhydrous calcium sulfo aluminate (C-S-A), super fine slag powder (P800) and anhydrite (CaSO4) in this paper. Scope of prescription is optimized according to performance requirements of JC/T1011-2006. This sulfate corrosion-resistance admixture has declared Chinese national invention patent (201010256189.2)[1]. Corrosion resistance coefficient is tested after sulfate corrosion-resistance admixture is adjoined into fly ash concrete. The results reveal that sulfate resistance of the concrete is obviously improved by addition of sulfate corrosion-resistance admixture, and the its anti sulfate erosion grade is KS150.

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Girskas, Giedrius, Džigita Nagrockienė, and Gintautas Skripkiūnas. "The effect of synthetic zeolite admixture on the durability of concrete paving blocks." Baltic Journal of Road and Bridge Engineering 11, no. 3 (September 30, 2016): 215–21. http://dx.doi.org/10.3846/bjrbe.2016.25.

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Concrete paving blocks that were started to be used in the last century have become very popular. They became an alternative to the natural stone. Concrete paving blocks are used for the paving of pedestrian and vehicle zones. Durability is one of the main characteristics in the production of high-quality concrete paving blocks in the Baltic region climate zone. The article describes tests with concrete paving blocks, the top layer of which contains 5% of synthetic zeolite admixture obtained by means of low temperature synthesis in laboratory conditions. This zeolite admixture is obtained from aluminium fluoride production waste. The durability of concrete paving blocks was tested according to abrasion resistance, tensile splitting strength, absorption and frost resistance. The test results revealed that 5% of zeolite admixture added to the top layer of concrete paving blocks reduce the absorption, increase the tensile splitting strength by more than 10%, and decrease abrasion by 6.5%. The zeolite admixture used in concrete paving blocks reduces the scaling about 4 times after 28 freeze-thaw cycles when 3% NaCl is used as the freezing solution. The tests revealed that synthetic zeolite admixture can be used in concrete elements production by means of vibropressing (pavement elements) to increase their durability.

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Marshdi, Qosai Sahib Radi, Ahlam Hamid Jasim, and Haider Abass Obeed. "Effect of Dolomite as Expansive Agent and Shrinkage Reducing Admixture in Self-Compacting Shrinkage – Compensating Concrete." Journal of University of Babylon for Engineering Sciences 26, no. 5 (March 6, 2018): 1–8. http://dx.doi.org/10.29196/jub.v26i5.848.

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The principle of using expansive agents has been recommended to manufacture shrinkage compensating concrete provided that an adequate wet curing is carried out. On the other hand, shrinkage-reducing admixture (SRA) in the concrete mixes, has been more recently suggested to reduce the risk of cracking in concrete structures caused by drying shrinkage. This paper is devoted to the study of the influence of complex modifier in the form of superplasticizer, shrinkage reducing admixture and expansive agent CaO- MgO-based on the fresh properties, hardening processand restrained shrinkage of Self-Compacting-Shrinkage-Compensating Concretes. The combined addition of shrinkage-reducing admixture with expansive agent has been found to be successful in producing shrinkage-compensating concrete. It should be noted also that the shrinkage reducing admixture slightly improve the workabilityof the fresh concrete mixtures but, it slightly reduces the early compressive strength of concrete.

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Xie, Li. "Influence of Mineral Admixtures on Early-Age Autogenous Shrinkage of High-Performance Concrete." Applied Mechanics and Materials 457-458 (October 2013): 318–22. http://dx.doi.org/10.4028/www.scientific.net/amm.457-458.318.

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The influence rules of the mineral admixtures containing fly ash, ground slag and silica fume on the early-age autogenous shrinkage of high-performance concrete have been discussed in this paper. According to the research results, fly ash mixture can substantially decrease the early-age autogenous shrinkage of high-performance concrete, while the silica fume will increase the autogenous shrinkage. Meanwhile the influence of ground slag on autogenous shrinkage is related to its fineness and admixture amount. Generally, it is believed that when the fineness of the fly ash is higher than 4000cm2/g, the autogenous shrinkage will increase with the increasing admixture amount. The double admixture or multi-admixture of fly ash or ground slag is better for reducing the early-age autogenous shrinkage of concrete than the single-admixture. The early-age autogenous shrinkage of concrete occurs in distinctive linear dependence with the three types of mineral admixtures.

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Gadgihalli, Vishal, Meena, Lohit, Raghavendra Prasad HavanjeDinakar, and Babitha Rani. "ANALYSIS OF PROPERTIES OF CONCRETE USING SEA SHELLS CRUSHEDPOWDER AS ADMIXTURE." International Journal of Research -GRANTHAALAYAH 5, no. 11 (November 30, 2017): 374–78. http://dx.doi.org/10.29121/granthaalayah.v5.i11.2017.2370.

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The tremendous increment of demand on concrete made admixture one of major component. As admixtures help in enhancement of concrete physical and chemical admixture. In this paper analysis of sea shells as chemical admixture is studied and verified the strength of concrete and temperature emitted due to chemical reaction to the normal Portland cement. As sea shells contain calcium carbonate, CaCo3 as major composition, as calcium is one major component that helps in densifying and hardening of bones in all living things. The flexural and compressive strength has gradually increased; the transmission temperature and reduction time of exothermal reaction has reduced. Hence seashell acts as great admixture.

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Li, Xin, Qiang Wang, and Shu Hua Liu. "Activity Index of Steel Slag-GGBS Composite Mineral Admixture at Different W/B Ratios." Applied Mechanics and Materials 584-586 (July 2014): 1541–44. http://dx.doi.org/10.4028/www.scientific.net/amm.584-586.1541.

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The activity index of steel slag-GGBS composite mineral admixture with different steel slag contents at the W/B of 0.3, 0.4, and 0.5 was investigated. The results show that the activity index of the composite mineral admixture with higher GGBS content is larger, and this phenomenon is more obvious at later ages. At lower W/B, the gap of activity index of different composite mineral admixtures is smaller. The activity index of each composite mineral admixture is higher at lower W/B and at later age. The steel slag-GGBS composite mineral admixture is more suitable to be used in high strength concrete than in low strength concrete. As far as the long-term properties of concrete are concerned, the activity index of the composite mineral admixture at the late age should be adopted.

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Křížová, Klára, and Rudolf Hela. "Effect of Combination of Admixture on the Development of Selected Properties of Concrete and their Comparison." Materials Science Forum 865 (August 2016): 206–10. http://dx.doi.org/10.4028/www.scientific.net/msf.865.206.

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The paper is involved with effects of admixtures (fly ash, slag) and their combination on selected properties of ordinary concrete. The set of concrete covers seven different containing of Portland cement and approximately 10% of admixed slag and concrete with fly ash and slag contents up to 42 %. At early age of the concrete balanced values of compressive strength were obtained except the concrete with admixture combinations. And on the contrary at 28-day age the concrete with admixture combinations obtained comparable values like concrete with only one type of admixture. The compressive strength was monitored together with modulus of elasticity to 180-day age of the concrete. In the last phase the obtained values were compared with guide value where the slower development of theses parameters with applied admixtures was pointed out.

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Zhang, Xiang Chao, Li Hui Xie, Hang Chan, and Jun Wen Huang. "Improving the Durability of Concrete for Mechane Engineering." Applied Mechanics and Materials 174-177 (May 2012): 362–65. http://dx.doi.org/10.4028/www.scientific.net/amm.174-177.362.

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In order to improve the durability of concrete for mechane engineering, the experimental investigation of the preparation process condition of concrete have been reported.The effect of mix proportion design and chemical admixture on the strength of concrete are studied, the anti-permeability and anti-erosion by acid are analyzed. The results indicated that the addition of 1% water-reducing admixture and 3% organic Si waterproof (the precent of admixture and cement in mass) are useful to improve the mechanics property and durability of the concrete, the compressive strength after dipped in water 48 h enhance 100% , the permaebility grade enhance from P4 to P10, the erosion coefficient K decrease from 6.1% to 2.2% and the erosion degree R decrease from 57.5% to 32.8%, respectively, compare with that without dopant the water-reducing admixture. The results gained in this study are helpful for improving the the durability of the concrete and enlarge application the mechane engineering in rural areas.

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Pazderka, Jiří, and Eva Hájková. "The Speed of the Crystalline Admixture’s Waterproofing Effect in Concrete." Key Engineering Materials 722 (December 2016): 108–12. http://dx.doi.org/10.4028/www.scientific.net/kem.722.108.

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There have been many experimental measurements of the waterproofing ability and durability of concrete with a crystalline admixture but there are uncertainties about the speed of the waterproofing effect caused by the crystalline admixture. The paper describes water pressure test carried out in different time intervals during the initial phase of cement hydration. The test results have shown that the full waterproofing effect of concrete with a crystalline admixture was available approximately on the 12th day after the concrete creation.

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Xia, Kai Quan, Wei Guo, Xue Wu Liu, Huan Liu, Zhan Guo Li, and Yue Li. "Research on the Effects of Admixture on Concrete Permeability." Applied Mechanics and Materials 618 (August 2014): 114–19. http://dx.doi.org/10.4028/www.scientific.net/amm.618.114.

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At present, our country norms on the permeability of concrete is mainly determined by its strength, without considering the influence of admixtures on the permeability. This paper studies the permeability of different strength concrete rules of different kinds and dosage of admixture. The results show that, the permeability of concrete is closely related to the w/b, but also it has a strong correlation with admixture dosage, the relevance between the permeability of concrete and the kinds of admixture is relatively small. The results of this paper can provide some reference value to the relevant standards of durability in our country.

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Chu, Hong Qiang, Lin Hua Jiang, Ning Xu, and Chuan Sheng Xiong. "Research on Mechanical Properties of C100 High-Strength Concrete Used for Frozen Shaft." Advanced Materials Research 598 (November 2012): 388–92. http://dx.doi.org/10.4028/www.scientific.net/amr.598.388.

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The mechanical properties of C100 high-strength concrete used for frozen shaft were studied in this research. The results demonstrate that: The cementitious materials 570kg/m3 concrete 28 strength is only 104.5MPa, which is lower than the C100 requirements; the early strength (3d) of the concrete doped with 30% admixture is less than 20% admixture concrete, but with the age increase, its strength gradually reaches close to concrete doped with 20% admixture, and eventually exceeds the concrete doped with 20% admixture.The tension-compression of high strength concrete doped with 15% fly ash and 15% slag is the smallest, while the tension-compression of the concrete doped 10% fly ash and 10% slag reaches the maximum.The Poisson's ratio of C100 concrete is between 0.20 and 0.24; the compressive elastic modulus is about 50GPa; and the tensile elastic modulus is about 110GPa.

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Quan, Hong-zhu, and Hideo Kasami. "Experimental Study on Durability Improvement of Fly Ash Concrete with Durability Improving Admixture." Scientific World Journal 2014 (2014): 1–11. http://dx.doi.org/10.1155/2014/818103.

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In order to improve the durability of fly ash concrete, a series of experimental studies are carried out, where durability improving admixture is used to reduce drying shrinkage and improve freezing-thawing resistance. The effects of durability improving admixture, air content, water-binder ratio, and fly ash replacement ratio on the performance of fly ash concrete are discussed in this paper. The results show that by using durability improving admixture in nonair-entraining fly ash concrete, the compressive strength of fly ash concrete can be improved by 10%–20%, and the drying shrinkage is reduced by 60%. Carbonation resistance of concrete is roughly proportional to water-cement ratio regardless of water-binder ratio and fly ash replacement ratio. For the specimens cured in air for 2 weeks, the freezing-thawing resistance is improved. In addition, by making use of durability improving admixture, it is easier to control the air content and make fly ash concrete into nonair-entraining one. The quality of fly ash concrete is thereby optimized.

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Al-obaidey, Shubbar Jawad. "The Synergic Effects of Mineral Admixtures in Ternary Blended Cement: A Review." Journal of Engineering 27, no. 2 (February 1, 2021): 83–105. http://dx.doi.org/10.31026/j.eng.2021.02.07.

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In the last decades, using mineral admixture in concrete became very necessary to improve concrete properties and reduce CO2 emissions associated with the cement production process. Subsequently, more sustainable concrete can be obtained. Ternary blended cement containing two different types of mineral admixture can achieve ambitious steps in this trend. In this research, the synergic effects of mineral admixtures in ternary blended cement and its effects on concrete fresh properties, strength, durability, and efficiency factors of mineral admixture in ternary blended cement, were reviewed. The main conclusion reached after reviewing many literature pieces is that the concrete with ternary blended cement, depending on types of mineral admixtures used, replacement percentages by weight of cement, and age of concrete, exhibited superior properties than with no mineral admixtures and corresponding binary blended cement concrete.

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Meng, Fan Shen. "Study on Effects of Admixture and Shrinkage Models on High-Performance Concrete." Advanced Materials Research 168-170 (December 2010): 1073–76. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.1073.

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The study on contraction of high performance concrete affected by slag, ash, silica fume, concrete shrinkage reducing admixture and water reducing admixture indicates that early contraction distortion of high-performance concrete is more complex that of ordinary concrete. A practical model for calculating stressis given.Compared to ordinary model of contraction, the proposed model in the paper is more suitable for the contraction distortion calculation of high performance concrete.

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Cao, Zhen Min, Li Shan Li, Yan Wang, and Wei Jun Yang. "Experimental Research on the Work Performance of Ceramisite Concrete with Mineral Admixture." Applied Mechanics and Materials 204-208 (October 2012): 4026–30. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.4026.

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The mechanism of effect on work performance of ceramisite concrete with two kinds of mineral admixture is analyzed and also the each effect on ceramisite concrete with different dosage of fly ash and pulverized slag mixed with concrete, and when the two mixed together, the effect on work performance of ceramisite concrete with different dosage of the admixture is analyzed, it provides a better basis to ceramisite concrete mixing.

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Haibier, Abuduhelili, and Yong Xin Wu. "Effects of Mineral Admixtures on Carbonation and Chloride Ingress of Concrete." Applied Mechanics and Materials 212-213 (October 2012): 878–82. http://dx.doi.org/10.4028/www.scientific.net/amm.212-213.878.

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Reinforcement corrosion is one important factor affecting the durability and safety of reinforced concrete structures. Concrete carbonation and chloride ion penetration is the main cause leading to steel corrosion, also important indicators affecting the service life of concrete structures. An accelerated carbonation experiment and Chloride penetration experiment was carried out on ordinary Portland cement (OPC) concrete and admixture concrete in various conditions. Eight concrete specimens of different mixture properties were tested in experiment. Resistance of OPC concrete system with and without mineral admixture (fly ash, slag) and air-entraining agent against carbonation was investigated. Besides, the influence of mineral admixture on the chloride penetration was also studied. The carbonation process and the factors affecting concrete carbonation are discussed according to test results. The test results were presented and they were in good agreement with the results of previous research.

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Journal articles on the topic 'Admixture(concrete)'

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