Journal articles: 'Mineral Admixture'

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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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M M, Kosukhin, Starostina I V, and Kosukhin A M. "The research of clinker monominerals modified suspensions’ rheological properties." International Journal of Engineering & Technology 7, no. 2.23 (2018): 31. http://dx.doi.org/10.14419/ijet.v7i2.23.11878.

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The findings of studying the influence of the superplasticizers of various natures on rheological properties of clinker monominerals’ water suspensions have been presented. It has been shown that the plasticizing activity of admixtures is determined by the nature and the specific surface of a monomineral and the nature of the admixture’s hydrophilic groups, and for complex admixtures also with the ratio of individual components. The optimal admixture dosages for monomineral suspensions of clinker minerals change in the row C2S, C3S, C3A, C4AF, which allows forecasting the influence of admixtures on rheological properties of systems with cements of various mineral compositions. The obtained data correlate with the research findings of the admixtures’ influence on cements of various mineral composition, which allows deducing the influence of admixtures on the systems with other cements, and providing the economically and technologically feasible selection and consumption of admixtures depending on the type of cement and its mineral composition.

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Wang, Yuan Gang, Peng Ma, Kai Jian Huang, Gao Qin Zhang, and Ya Feng Hu. "Impact of Composite Mineral Admixture on Carbonization Resistance of High Performance Concrete." Advanced Materials Research 1095 (March 2015): 248–53. http://dx.doi.org/10.4028/www.scientific.net/amr.1095.248.

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Fly ash, silica fume and ground steel slag are chosen to make up composite mineral admixtures. Through the orthogonal test, carbonization resistance property of High Performance Concrete (HPC) mixed with composite mineral admixtures is studied. Test results show that the carbonization resistance property of HPC can be improved with defined amount of composite mineral admixture mixed, in addition, the effect of ternary composite admixture of ground steel slag, fly ash and silica fume is more obvious than that of binary composite admixture.

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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 (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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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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Popek, Mateusz, and Łukasz Sadowski. "Effect of Selected Mineral Admixtures on Mechanical Properties of Concrete." Key Engineering Materials 728 (January 2017): 367–72. http://dx.doi.org/10.4028/www.scientific.net/kem.728.367.

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The effect of mineral admixtures on compressive and tensile strength of concrete was studied in the article. The concrete mixtures were modified by quart, quartz-feldspar and basalt powder in amount 10, 20 and 30 % by weight of cement. The mix with no mineral admixture was prepared as a control sample. The results obtained show that selected mineral admixtures lower concrete strength but the degree of strength reduction depends on the used mineral admixture and its concentration.

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Li, Yun Feng, Yang Liu, Rong Qiang Du, and Fan Ying Kong. "Effect of Steel Slag Powder on the Durability of High Performance Concrete." Advanced Materials Research 79-82 (August 2009): 175–78. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.175.

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dvanced mineral admixtures can lead to economical high performance concrete with enhanced durability and reduced cement content. When super fine steel slag powder is mixed into concrete as active admixture, resistance to abrasion and resistance to chloride penetration are improved as well as workability and mechanical properties of the concrete. Resistance to abrasion of steel slag concrete is measured and resistance to chloride penetration is also determined by the method of NEL and ASTM C1202 in this paper. Result shows that compound mineral admixtures as partial replacement for Portland cement in mortar enhance abrasion resistance. Mixing mineral admixture is an effective means for controlling the chloride permeability. Concrete specimens prepared with compound mineral admixture with steel slag powder and blast furnace slag powder has very low permeability.

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8

Khan, Sadaqat Ullah, Muhammad Fadhil Nuruddin, Tehmina Ayub, and Nasir Shafiq. "Effects of Different Mineral Admixtures on the Properties of Fresh Concrete." Scientific World Journal 2014 (2014): 1–11. http://dx.doi.org/10.1155/2014/986567.

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This paper presents a review of the properties of fresh concrete including workability, heat of hydration, setting time, bleeding, and reactivity by using mineral admixtures fly ash (FA), silica fume (SF), ground granulated blast furnace slag (GGBS), metakaolin (MK), and rice husk ash (RHA). Comparison of normal and high-strength concrete in which cement has been partially supplemented by mineral admixture has been considered. It has been concluded that mineral admixtures may be categorized into two groups: chemically active mineral admixtures and microfiller mineral admixtures. Chemically active mineral admixtures decrease workability and setting time of concrete but increase the heat of hydration and reactivity. On the other hand, microfiller mineral admixtures increase workability and setting time of concrete but decrease the heat of hydration and reactivity. In general, small particle size and higher specific surface area of mineral admixture are favourable to produce highly dense and impermeable concrete; however, they cause low workability and demand more water which may be offset by adding effective superplasticizer.

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Wang, Xue Fang, and Jian Lan Zheng. "Influence of Compounded Mineral Admixtures on Shrinkage and Early-Age Cracking Behaviors of Concrete." Advanced Materials Research 450-451 (January 2012): 738–42. http://dx.doi.org/10.4028/www.scientific.net/amr.450-451.738.

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Influence of compounded mineral admixtures on shrinkage and early-age cracking behaviors of concrete was studied, based on the fellow factors: fly ash to blast furnace slag(denoted as BSF) ratio, fly ash-metakaolin ratio, BSF-silica fume ratio. Research shows that the Pozzolanic admixtures compounded with cementitious admixtures have complementary and synergistic effect for hydration progress of concrete, which can enhance the volume stability and cracking behaviors of concrete. However, the pozzolanic admixture compounded with other pozzolanic admixture, two pozzolanic admixtures will grab Ca(OH)2 resource. And then if the dosage of mineral admixture is higher, the compounding will result to decrease the volume stability and cracking behaviors of concrete.

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10

DING, Xiangqun, Tingyu LI, and Baoxin YANG. "Experimental Study on the Effect of Ultrafine Mineral Admixtures on the Mechanical Properties of Cement Mortar." Progress in Chinese Materials Sciences 2, no. 1 (2023): 1–7. http://dx.doi.org/10.48014/pcms.20230306001.

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Objective: The effect of ultrafine mineral admixtures on the mechanical properties of grouting mortar was studied. Methods: In this paper, the compressive strength and flexural strength of the mortar with different contents of ultrafine mineral admixture replacing cement were tested respectively, and the heat of hydration was tested. XRD and SEM were used to analyze the changes in the microstructure characteristics after the addition of ultrafine mineral admixture. Results: after the addition of 5% ultrafine mineral admixture, the fluidity of cement slurry decreased by 25. 3%, and the fluidity gradually decreased with the gradual increase of ultrafine mineral admixture. With the addition of superfine mineral addition, The compressive strength increased steadily and gradually decreased thereafter, while the content of superfine mineral added was 20%, the strength of rubber sand reached the maximum value at 28 days, which increased by 23. 76% compared with the test block without admixture. The flexural strength of 3d and 7d of rubber sand was weakened by the incorporation of ultrafine mineral admixture, and the flexural strength of 28d increased slowly with the incorporation of ultrafine admixture, and the flexural strength value reached the maximum when the dosage was 25%. The heat of hydration and microstructure analysis showed that the sand system produced more hydrated calcium silicate gel filling into the structure of the sand after the addition of ultrafine mineral admixture. Conclusion: a certain amount of ultrafine mineral admixture has remarkable influence on the compression strength of rubber sand, and the flexural strength of 3d and 7d is weakened, and increases the flexural strength of 28d.

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11

Han, Yongguang, and Tianhua Zhou. "Performance Analysis of High-Performance Concrete Materials in Civil Construction." Materials 16, no. 16 (2023): 5711. http://dx.doi.org/10.3390/ma16165711.

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This paper develops the mechanical and durable samples of C50 high-performance concrete, studies the mechanical properties, crack resistance, sulfate attack resistance, frost resistance, and impermeability of concrete with different mineral admixtures of mineral powder and fly ash, and obtains the best mineral admixture of mineral powder and fly ash to improve the performance of high-performance concrete. The results show that the doping effect is the best when the ratio of prepared mineral powder to fly ash is 3:2. With the increase in the mineral powder–fly ash admixture, the slump and expansion of high-performance concrete decrease rapidly at first and then slowly. In total, 60% doping is the turning point; the compressive and flexural strengths of concrete decreased slowly at first and then rapidly. Taking 30% of the admixture as the turning point, 35% of the mineral powder fly ash is generally selected. By mixing and adding a certain proportion of fly ash and mineral powder admixtures, the crack resistance of concrete is enhanced, and the shrinkage and cracking are reduced. The corrosion resistance coefficient will exceed 88%, the relative dynamic elastic modulus will exceed 95%, and the impermeability grade will reach P17. The durability of concrete can be improved by adding mineral admixtures.

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Xu, Shengnan, Zhishan Xu, and Yongsheng Ji. "Preparation and Mechanical Properties of Low Carbon Cementitious Materials with Superfine Cement Reverse Filling High-Volume Mineral Admixtures." Materials 16, no. 13 (2023): 4814. http://dx.doi.org/10.3390/ma16134814.

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In order to increase the content of mineral admixtures in cement, this study proposes a method for preparing a high-volume mineral admixture cementitious material (HMAC) using superfine cement as a reverse filling material. Firstly, superfine cement is prepared through mechanical grinding. Then, the activity of mineral admixtures (such as slag and fly ash) is enhanced by mechanical grinding, sulfate activation, and alkali activation methods. Meanwhile, the evolution of HMCM from microstructure to macroscopic mechanical behavior is studied by combining a laser particle size analyzer and a scanning electron microscope. Furthermore, the reverse filling mechanism of superfine cement on mineral admixtures under different activation conditions is proposed. Results show that superfine cement can largely improve the utilization rate of cement clinker and the compressive strength of cementitious materials. In the condition that the compressive strength is not lower than that of the control group (without mineral admixture), the content of mineral admixture can be increased to 50%, 70%, and 90% after mechanical grinding, sulfate activation, and alkali activation, respectively. Analysis indicates that the reverse filling effect of superfine cement is the main reason for improving the density of the HMCM.

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13

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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Tang, Ying, and Guo An Wang. "A Research on the Anti-Sulfate Corrosion Effects of the Concrete Mixed with Complex Multi-Mineral Admixture." Applied Mechanics and Materials 71-78 (July 2011): 755–59. http://dx.doi.org/10.4028/www.scientific.net/amm.71-78.755.

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This paper is focused on the method for improving capability of anti-sulfate corrosion of concrete. Based on the performance characteristics of mineral admixture, propose a method that mixing concrete with complex multi-mineral admixture to improve the effect of anti-sulfate corrosion. Finally, the ability of anti-sulfate corrosion and anti-dry-wet cycle, in different case, is studied and compared. The results show that concrete mixed with complex multi-mineral admixture is advantageous to improve the anti-sulfate corrosion effects of the concrete. The proportion of mineral admixtures has significant influence on the anti-sulfate corrosion effect. As the silica fume and slag content increased, the fly ash content decreased, the ability of anti-sulfate corrosion enhanced.

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Guo, Wen Ying, Mei Ru Zheng, Yi Bo Yang, and Heng Chang Wang. "Research on the Proportion of Inorganic Binder Stabilize Materials with Soda Residue." Key Engineering Materials 629-630 (October 2014): 481–86. http://dx.doi.org/10.4028/www.scientific.net/kem.629-630.481.

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The soda residue pollutes the environment because of high contents of alkali ion and choleric ion in it. So how to treat the soda residue is an urgent problem to be solved. The mineral admixtures are added in traditional inorganic binder to improve the strength performance of inorganic binder stabilized materials and decrease the negative effect of soda residue is studied. And the results as followings: (1) Soda residue has different activated effect on mineral admixture; (2) Mineral admixture replace the cement with same dosage can improve the unconfined compressive strength greatly to meet the requirement of standard; (3) The choleric ion leaching rates of cement-mineral admixture-soda residue stabilized stone chip decrease with time. Mineral admixture has a better immobilization effect on the chloride ion except fly ash before 90d; (4) Ground granular blast-furnance slag is the best material to improve the strength performance of inorganic binder stabilized materials and decreases the negative effect of soda residue.

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Huang, Zhi De. "Study on High Amount Mineral Admixtures Concrete Performance." Applied Mechanics and Materials 357-360 (August 2013): 667–70. http://dx.doi.org/10.4028/www.scientific.net/amm.357-360.667.

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Depended on Qingdao Bay Bridge construction, large amount mineral admixture replacing cement has been conducted systematical research aiming at marine concrete, main control index is chloride ion permeability resistance. The main research contents concrete working, mechanical properties and chloride ion permeability resistance at low water binder ratio and large amounts mineral admixture. Measures and adjustment are proposed for marine concrete construction control and cementitious material system that using amount mineral admixtures and low water binder ratio.

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Ramdas, M. Pise, Deshmukh C.M., and Lakade G.D. "Review on Performance Evaluation of High-Performance Concrete Using Ultrafine Mineral Admixture." Journal of Advanced Cement & Concrete Technology 7, no. 2 (2024): 9–15. https://doi.org/10.5281/zenodo.10896420.

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<em>This study aims to investigate the effects of incorporating ultrafine mineral admixtures on the properties of High-Performance Concrete (HPC). The research examines the performance enhancements achieved through the addition of these admixtures, focusing on aspects such as compressive strength, durability, workability, and microstructural characteristics. Experimental procedures involve varying concentrations of ultrafine mineral admixture in concrete mixes and conducting a series of tests to evaluate the resultant properties. The findings of this study will contribute to the understanding of utilizing ultrafine mineral admixtures to enhance the performance of high-performance concrete, offering insights for optimizing concrete mix designs in construction applications. High-Performance Concrete (HPC) has garnered significant attention in recent years due to its superior mechanical properties and durability characteristics, making it suitable for a wide range of structural applications. The research explores the effects of incorporating various concentrations of ultrafine mineral admixture, such as silica fume or metakaolin, on the compressive strength, modulus of elasticity, shrinkage, permeability, and microstructural properties of HPC.Experimental investigations involve the preparation of HPC mixes with different proportions of ultrafine mineral admixture, ranging from 2% to 10% replacement of cement by weight. Standard testing protocols, including compressive strength tests, modulus of elasticity measurements, shrinkage evaluations, permeability assessments and Scanning Electron Microscopy (SEM) analysis, are conducted to assess the performance of the concrete mixes. Results indicate that the inclusion of ultrafine mineral admixtures leads to improvements in compressive strength, modulus of elasticity, and durability properties of HPC. </em>

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Wang, H., and JE Gillott. "Effect Of Three Zeolite-containing Natural Pozzolanic Materials On Alkali-Silica Reaction." Cement, Concrete, and Aggregates 15, no. 1 (1993): 24–30. http://dx.doi.org/10.1520/cca10584j.

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Abstract This paper describes the effect of three natural zeolite-containing pozzolanic admixtures on expansion of mortar bars caused y alkali-silica reaction (ASR). Heulandite is present in all three samples, and clinoptilolite may be also present in one sample. Silica is also present in all three samples, but the mineral form and the amount of silica are significantly different in the different samples. Nevada opal was used as the alkali-expansive mineral in the aggregate, and the three admixtures (I, II, and III) were each blended with Type 10 portland cement at three replacement levels by weight of 6, 12, and 24%. Mortar bars containing 6 and 12% of the pozzolanic admixture tended to expand more than control bars, but when 24% admixture was present, expansion was reduced. The study suggests that the mineral composition and the content of alkali-reactive components in the admixture have an important bearing on their effectiveness in reducing expansion due to ASR.

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Lu, Wei, Guobao Ning, Jiao Tang, Limei Geng, and Wei Luo. "Influence of mineral admixtures on high performance concrete." Vibroengineering PROCEDIA 44 (August 25, 2022): 99–104. http://dx.doi.org/10.21595/vp.2022.22780.

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Taking high performance concrete (HPC) in hydraulic engineering as an example, this paper discusses the influence of different mixing methods of slag powder and fly ash on its frost resistance and chloride ion permeability. The results show that the compressive strength decreases with the addition of HPC; Proper addition of mineral admixtures is beneficial to improve the anti chloride ion permeability of HPC and reduce the electric flux; The HPC flux of 28d and 90 reaches 680C and 280C, when the mass ratio of slag powder to fly ash is 15:35 and the content of mineral admixture is 35 %; The frost resistance of HPC gradually deteriorates with the increase of mineral admixture under the condition of constant air content and water binder ratio. The frost resistance grade of HPC without mineral admixture reaches F200, and its frost resistance is the best.

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Zhang, Ping, Hong Gen Qin, Yi Kun Hou, Chao Ming Pang, Wei Sun, and Wei Ling Zhou. "Study of Concrete Deterioration under Immersion in Simulated Seawater." Applied Mechanics and Materials 204-208 (October 2012): 2330–33. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.2330.

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The underwater performance deterioration of different mineral admixtures concrete was tested through the indoor immersion experiment. The effect and mechanism of fly ash and slag powder were studied after 360d’s immersion. The performance deterioration and internal structure changes were analyzed with chloride ion content, ultrasonic test, SEM scan and X-CT technology. The results showed that mineral admixtures can refine the pore structure and block the channel in the concrete. The mineral admixture (especially FA) can help to resist chloride penetration. The ultrasonic velocity of C50F and C50S increased first, and then decreased after 160d and 50d, respectively. After 360d’s corrosion, the porosity (holes with diameter greater than 30μm) of three samples all increased, but the shape of holes for mineral admixture concrete changed significantly. Among them, the adding of SL had greater effect on the porosity.

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Geethakumari, B., R. Ramesh Kumar, and V. Syam Prakash. "Influence of Mineral Admixtures on Fracture Energy of Refractory Cement at Elevated Temperatures." Materials Science Forum 866 (August 2016): 88–93. http://dx.doi.org/10.4028/www.scientific.net/msf.866.88.

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The influence of three mineral admixtures, Silica Fume (SF), Fly Ash (FA), and Rice Husk Ash (RHA) on the fracture energy of Refractory Cement (RC) over a wide range of temperature from 300K to 1173K is studied. The optimum percentage replacement of RC by these admixtures is found to be around 0.5 for all the temperatures considered but for FA. Fracture energy of control (0% admixture) and blended RC (with 0.5% admixture) are determined by three point bending of notched beam specimens. Fracture energy of RC blended with the three mineral admixtures is lower than that of control RC for temperature range of 300K to 873K. But at elevated temperature of 1173K, blending plays its role as an admixture. Experimental results are corroborating with XRD. It is observed that phenomenon of pseudo dryness of Gismondine in the blended RC causes higher fracture energy which is double that of RC only at 1173K.

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Chen, Feng, Shenghao Tong, Wang Hao, and Shilin Shen. "Dynamic Compression Properties of Ni-Fe Slag Powder Soil Cement under Impact Load." Coatings 12, no. 7 (2022): 1003. http://dx.doi.org/10.3390/coatings12071003.

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In this research, Ni-Fe slag powder and mineral powder are blended into mineral admixtures and added to soil cement, with the aim of investigating the mechanical property of soil cement under a dynamic environment, and the dynamic properties of Ni-Fe slag powder soil cement after impact compression are obtained by conducting split-Hopkinson pressure bar (SHPB) test. The results show that under the same age and different admixture conditions, the dynamic stress of Ni-Fe slag powder soil cement increases first and then decreases and reaches the maximum when the admixture ratio is 40%, and the dynamic stresses at 7 d, 28 d and 60 d were 5.10 MPa, 9.73 MPa and 13.51 MPa, respectively. Under the same admixture ratio, Ni-Fe slag powder soil cement shows an increasing trend in dynamic stress with age, and its growth rate at the curing age from 7 d and 28 d is significantly higher than that at the curing age from 28 d to 60 d. After comparison, it is concluded that the best admixture ratio for Ni-Fe slag powder is 40%, which is close to the maximum value of 45% for mineral admixtures to replace cement as specified in the national standard.

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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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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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Shangina, N. N., and T. Yu Safonova. "Influence of mineral admixtures on shrinkage deformation of stone from lime solution." Вестник гражданских инженеров 18, no. 2 (2021): 142–49. http://dx.doi.org/10.23968/1999-5571-2021-18-2-142-149.

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The analysis of research works devoted to the study of different mineral admixtures influence on development of shrinkage deformation of cement stone is presented.There were studued strength properties and shrinkage deformation of stone from lime building solution based on binder agent with active mineral admixture. The authors give the data on the influence of active type admixture on the change of air shrinkage of stone aged up to 28 days, and the comparison of these date with plain solution content without admixtures has been carried out. It has been established that shrinkage for stone aged 28 days from mixture with metakaolin is 10 percent lower than that of stone of the same age from mixture with microsilica suspension.

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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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Ding, Qing Jun, Xiu Lin Huang, and Hua Sun. "Study on the Hydration Micro-Structure and Properties of Complex Cementitious Systems." Advanced Materials Research 150-151 (October 2010): 783–87. http://dx.doi.org/10.4028/www.scientific.net/amr.150-151.783.

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In this study complex cementitious systems were prepared by cement, slag, fly ash and silica fume. Changing the dosages of mineral admixtures, then studying the strength and micro-structure of harden cement pastes by XRD,SEM,BET etc. Comparing the influence of variety and dosage of mineral admixture on cement pastes.Finally we found that mineral admixtures could improve the pore size distribution of cement pastes, and the total dosage 10% is better than 20%; and the "FA+SF" is better than others.

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Zhou, Xuan, Zhongyang Mao, Penghui Luo, and Min Deng. "Effect of Mineral Admixtures on the Mechanical and Shrinkage Performance of MgO Concrete." Materials 16, no. 9 (2023): 3448. http://dx.doi.org/10.3390/ma16093448.

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Shrinkage deformation of concrete has been one of the difficulties in the process of concrete performance research. Cracking of concrete caused by self-shrinkage and temperature-drop shrinkage has become a common problem in the concrete world, and cracking leads to a decrease in the durability of concrete and even a safety hazard. Mineral admixtures, such as fly ash and mineral powder, are widely used to improve the temperature drop shrinkage of mass concrete; fly ash can reduce the temperature rise of concrete while also reducing the self-shrinkage of concrete, there are different results on the effect of mineral powder on the self-shrinkage of concrete, but the admixture of fly ash will reduce the strength of concrete, and mineral admixtures have an inhibitory effect on the shrinkage compensation effect of MgO expander(MEA). The paper investigates the effect of mineral admixtures on the mechanical and deformation properties of C50 mass concrete with a MgO expander(MEA), aiming to determine the proportion of C50 mass concrete with good anti-cracking properties under working conditions. The experiments investigated the effect of fly ash admixture, mineral powder admixture and MgO expander admixture on the compressive strength and deformation of concrete under simulated working conditions of variable temperature and analyzed the effect of hydration of magnesite in MgO expander and pore structure of cement paste on deformation. The following main conclusions were obtained: 1. When the concrete compounded with mineral admixture was cured under variable temperature conditions, the compounded 30% fly ash and mineral powder decreased by 4.3%, 6.0% and 8.4% at 7d age, and the compounded 40% fly ash and mineral powder decreased by 3.4%, 2.8% and 2.3% at 7d age, respectively. The incorporation of MEA reduced the early compressive strength of concrete; when the total amount of compounding remained unchanged, the early compressive strength of concrete was gradually smaller as the proportion of compounding decreased. 2. The results of concrete deformation showed that when the temperature rose, the concrete expanded rapidly, and when the temperature dropped, the concrete also showed a certain shrinkage, and the deformation of concrete basically reached stability at 18d. 3. The compounding of 30% fly ash and mineral powder As the compounding ratio decreases, the deformation of concrete increases, and the 28d deformation of concrete with a compounding ratio of 2:1 is 280 × 10−6, while the final stable deformation of concrete with a compounding ratio of 2:1 in compounding 40% fly ash and mineral powder is the largest, with a maximum value of 230 × 10−6, respectively. Overall, the concrete with a total compounding of 30% and a compounding ratio of 2:1 has the best shrinkage resistance performance.

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Dong, Rong Zhen, Jun Wei, Yun Xuan Qi, et al. "Compensation Effect of Expansive Agent on Shrinkage of Self-Compacting Concrete." Applied Mechanics and Materials 507 (January 2014): 401–5. http://dx.doi.org/10.4028/www.scientific.net/amm.507.401.

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The compensation effect of expansive agent on shrinkage of self-compacting concrete (SCC) are studied. The deformation of Concrete was tested by concrete comparator, and the qualitative and quantitative analysis of hydration products were done by X-ray diffractometer (XRD). The results show that the dosages of mineral admixture and curing conditions affect the application results of expansive agents markedly. SCC samples containing expansive agent cured in the water are expanding within the test time. In the case of watering condition and natural curing condition, the samples are always shrinkage within test time, but mineral admixtures have a good effect to resist the shrinkage of SCC. Microstructure analysis show that ettringite content is reduced slightly due to the reduction of the alkalinity of SCC resulted by more mineral admixture. However, when at water curing condition, humidity inside SCC is much higher, which makes ettringite content larger even though with more mineral admixture. So, curing is the most important factors for the micro-expansion of SCC containing expansive agent.

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Lee, Kwang-Myong, Su-Ho Bae, Jae-Im Park, and Soon-Oh Kwon. "Mass Change Prediction Model of Concrete Subjected to Sulfate Attack." Mathematical Problems in Engineering 2015 (2015): 1–10. http://dx.doi.org/10.1155/2015/298918.

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The present study suggested a mass change prediction model for sulfate attack of concrete containing mineral admixtures through an immersion test in sulfate solutions. For this, 100% OPC as well as binary and ternary blended cement concrete specimens were manufactured by changing the types and amount of mineral admixture. The concrete specimens were immersed in fresh water, 10% sodium sulfate solution, and 10% magnesium sulfate solution, respectively, and mass change of the specimens was measured at 28, 56, 91, 182, and 365 days. The experimental results indicated that resistance of concrete containing mineral admixture against sodium sulfate attack was far greater than that of 100% OPC concrete. However, in terms of resistance against magnesium sulfate attack, concrete containing mineral admixture was lower than 100% OPC concrete due to the formation of magnesium silicate hydrate (M-S-H), the noncementitious material. Ultimately, based on the experimental results, a mass change prediction model was suggested and it was found that the prediction values using the model corresponded relatively well with the experimental results.

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Djamila, Boukhelkhal, and Guendouz Mohamed. "The use of non-destructive tests to estimate Self-compacting concrete compressive strength." MATEC Web of Conferences 149 (2018): 01036. http://dx.doi.org/10.1051/matecconf/201814901036.

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Until now, there are few studies on the effect of mineral admixtures on correlation between compressive strength and ultrasonic pulse velocity for concrete. The aim of this work is to study the effect of mineral admixture available in Algeria such as limestone powder, granulated slag and natural pozzolana on the correlation between compressive strength and corresponding ultrasonic pulse velocity for self-compacting concrete (SCC). Compressive strength and ultrasonic pulse velocity (UPV) were determined for four different SCC (with and without mineral admixture) at the 3, 7, 28 and 90 day curing period. The results of this study showed that it is possible to develop a good correlation relationship between the compressive strength and the corresponding ultrasonic pulse velocity for all SCC studied in this research and all the relationships had exponential form. However, constants were different for each mineral admixture type; where, the best correlation was found in the case of SCC with granulated slag (R2 = 0.85). Unlike the SCC with pozzolana, which have the lowest correlation coefficient (R2 = 0.69).

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Lu, Feng, Haiyan Wang, Lichuan Wang, Kai Zhao, and Junru Zhang. "Degradation Law and Service Life Prediction Model of Tunnel Lining Concrete Suffered Combined Effects of Sulfate Attack and Drying–Wetting Cycles." Materials 15, no. 13 (2022): 4435. http://dx.doi.org/10.3390/ma15134435.

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The present study explored the degradation law and service life prediction of tunnel lining concrete with different mineral admixtures under coupled actions of sulfate attack (SA) and drying–wetting (DW) cycles. The deterioration resistance coefficient (DRC) of compressive strength and influence coefficients of sulfate concentration, mineral admixture content, water/binder (w/b) ratio, and curing regime on DRC were studied. After that, a new service life prediction model based on damage mechanics was developed and analyzed. Results show that, by increasing the DW cycles, the DRC first increases and then decreases. DRCs of Ordinary Portland cement (OPC), fly ash (FA), and ground granulated blast-furnace slag (GGBS) concrete linearly decrease with the increase of sulfate concentration, while the silica fume (SF) concrete displays a two-stage process; by increasing the admixture content, the DRCs of FA and GGBS concrete exhibit two distinct stages, while the SF concrete depicts a three-stage process; increasing the w/b ratio linearly decreases the DRC; the DRC of curing regime was sequenced as standard curing (SC) > fog curing (FC) > water curing (WC) > same condition curing (SCC). Based on the experimental results, the service life prediction model is applied and validated. The validation results show that the proposed model can accurately predict the lifetime of concrete with different mix proportions. Furthermore, it is found that the mineral admixture can effectively improve the lifetime of concrete, and the composite mineral admixture is more effective than a single mineral admixture in improving the lifetime of concrete.

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Yao, Ling, Shi Wei Li, and Chao Li. "Reflections on the Detection Method of Polycarboxylate Superplasticizer." Applied Mechanics and Materials 744-746 (March 2015): 1570–75. http://dx.doi.org/10.4028/www.scientific.net/amm.744-746.1570.

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According to the detection method of "Polycarboxylates high performance water reducing admixture"(JG/T223-2007), the different concrete mix ratio with different binder systems were designed to test the air-entraining content and compressive strength ratio for 3days of the HSP-V and PCA-II polycarboxylate superplasticizer. The results show that the mineral admixtures can reduce the air-entraining content of the HSP-V and PCA-II polycarboxylate superplasticizer, and lead to the compressive strength ratio for 3 days improved. Therefore mineral admixture on polycarboxylate superplasticizer should be fully considered, in order to adapt to the needs of the practical engineering.

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Ayub, Tehmina, Sadaqat Ullah Khan, and Fareed Ahmed Memon. "Mechanical Characteristics of Hardened Concrete with Different Mineral Admixtures: A Review." Scientific World Journal 2014 (2014): 1–15. http://dx.doi.org/10.1155/2014/875082.

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The available literature identifies that the addition of mineral admixture as partial replacement of cement improves the microstructure of the concrete (i.e., porosity and pore size distribution) as well as increasing the mechanical characteristics such as drying shrinkage and creep, compressive strength, tensile strength, flexural strength, and modulus of elasticity; however, no single document is available in which review and comparison of the influence of the addition of these mineral admixtures on the mechanical characteristics of the hardened pozzolanic concretes are presented. In this paper, based on the reported results in the literature, mechanical characteristics of hardened concrete partially containing mineral admixtures including fly ash (FA), silica fume (SF), ground granulated blast furnace slag (GGBS), metakaolin (MK), and rice husk ash (RHA) are discussed and it is concluded that the content and particle size of mineral admixture are the parameters which significantly influence the mechanical properties of concrete. All mineral admixtures enhance the mechanical properties of concrete except FA and GGBS which do not show a significant effect on the strength of concrete at 28 days; however, gain in strength at later ages is considerable. Moreover, the comparison of the mechanical characteristics of different pozzolanic concretes suggests that RHA and SF are competitive.

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Kravtsov, Aleksey Vladimirovich, Sergey Valer’evich Tsybakin, Ekaterina Alekseevna Vinogradova, and Lidiya Mikhaylovna Borodina. "Concrete with organic mineral admixture based on fine grinding cooper slag." Vestnik MGSU, no. 2 (February 2016): 86–97. http://dx.doi.org/10.22227/1997-0935.2016.2.86-97.

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The problem of applying copper manufacturing wastes locating in Chelyabinsk region as a component of organic mineral admixture for concrete with industrial wastes production is considered in this article. Also, organic mineral admixture consisting of superplasticizers, based on esters with carboxyl groups, has not yet been sufficiently studied due to the diversity of species and the complexity of chemical structure. This trend is current for today’s science because of the growing rates and scales of building production, in particular, concrete works. Using new complex admixtures processed of industrial by-products showed their effectiveness. Copper slag dumps located in Urals federal district haven’t been widely used in building production or in other industrial production up to the present time. Efficient utilization of copper production waste materials will help to solve the ecological problems in most regions of Russia. The structure formation period of cement stone with organic mineral admixture, based on fine grinding cooper slag and superplasticizer, is also studied in the article. The thermal variation diagram of concrete mixture with organic mineral admixture during 22 hours of hardening under normal condition are shown and the results of ultrasound of concrete forming structure period during 6 hours of hardening are presented in this article. The strength development process diagram of concrete with organic mineral admixture during 28 days of hardening under normal condition and the research results of the compressive strength of concrete samples are also presented. The obtained characteristics confirm the prospects of applying this kind of non-ferrous metallurgy wastes in the concrete. Also, the obtained results allow us to conclude the significant advantages of using this kind of complex admixture for concrete production with different purpose and in different fields of application.

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Wang, Yuan Gang, Chao Wan, Kai Jian Huang, Gao Qin Zhang, and Ya Feng Hu. "Study on the Workability of High Performance Concrete Mixture with Compound Mineral Admixtures." Advanced Materials Research 671-674 (March 2013): 1839–43. http://dx.doi.org/10.4028/www.scientific.net/amr.671-674.1839.

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Several compound mineral admixtures, such as steel slag powder, granulated blast furnace slag powder and silica fume, are mixed with proper proportion to improve the workability of High Performance Concrete（HPC）. Through the orthogonal experiment, workability of HPC is analyzed on water-binder ratio, sand ratio, the amount of superplasticizer and the amount of compound mineral admixtures. Results show that: workability of HPC was significantly effected by the amount of naphthalene sulphonate water-reducing admixture and water-binder ratio, the amount of compound mineral admixtures and sand ratio are impact factors on the workability in a certain extent.

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37

Sun, Yong Mei, and Juan Hong Liu. "Experimental Study on Performance of Green Complex Binder of Low-Grade Fly Ash and Limestone Powder." Advanced Materials Research 152-153 (October 2010): 992–95. http://dx.doi.org/10.4028/www.scientific.net/amr.152-153.992.

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In this article, the effects of different content and compound ratio of low-grade fly ash and limestone powder on the strength, water requirement and adaptability with admixture of green complex binder were studied, and the influence of particle size distribution and particle morphology on its performance was analyzed. The results indicated that the strength decreased obviously with the increase of mineral content. There was an optimum ratio of fly ash and limestone powder (6:4) at a certain mineral content. Water requirement decreased, and the saturated content of admixture points became small with the increasing of limestone powder. The effects of content on the strength were much more than that of particle size distribution for composite cement with high volume of mineral admixtures.

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Holika Kumari and Vikash Kumar Badal. "Behavior of self-compacting concrete incorporating mineral admixture." International Journal of Science and Research Archive 8, no. 1 (2023): 771–80. http://dx.doi.org/10.30574/ijsra.2023.8.1.0139.

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The objective of this paper is to investigate the effect that mineral admixtures, different SPs, and different VMAs have on the fresh qualities of SCMs. In this specific instance, the four mineral admixtures that are used are fly ash, limestone powder, brick powder, and kaolinite. Pozzolanic or non-pozzolanic are two possible classifications for these admixtures. One of the SPs had a base consisting of melamine formaldehyde, while the other three included polycarboxylates as their primary component of their bases. On the other hand, the VMAs were an aqueous dispersion of microscopic admixtures based on silica, and they also included a high molecular weight admixture based on hydroxylated polymer. It is possible to make a variety of concrete mixes, each of which has its own unique slump flow, V-funnel, and setting characteristics, which are evaluated in the same way as the fresh properties. At 7, 14, and 28 days of age, respectively, the material is evaluated for its density, ultrasonic pulse velocity, and strength. These are the hardened attributes that are taken into account.

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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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Luan, Guang Ri, Lian Jun Wang, and Yi Li. "Effects of Fluidity and Strength on Cement Mortar with Compound Mineral Admixture." Applied Mechanics and Materials 97-98 (September 2011): 373–77. http://dx.doi.org/10.4028/www.scientific.net/amm.97-98.373.

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In this paper, the influence of compound mineral admixture on cement mortar’s performance is studied. The optimum compound proportion of compound mineral admixture and the suitable substitution amount can be obtained. The analysis work is carried out on the additive effect of compound mineral admixture. It is shown that the mineral admixture has many advantages, such as improving the performance of cement mortar, making full use of waste, reducing the cost and environmental protection.

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Świerczyńska, Anna Maria. "Studia nad domieszką mineralną w ceramice naczyniowej kultury amfor kulistych z terenu Kujaw." Folia Praehistorica Posnaniensia 24 (December 15, 2019): 311–26. http://dx.doi.org/10.14746/fpp.2019.24.18.

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This article relates to the question, „what exactly is a mineral admixture in Globular Amphora Culture?”. My studies prove that only the granites fulfill the criteria. I designed the experiment. One of the goals was to examine which stone is the easiest to process. It was a rapakivi granite. Its minerals are pink or grey after processing. The admixture found in GAC ceramics has the same color and the same size of minerals. There was another type of admixture which was not recognizable.

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Christopher Gnanaraj, S., Ramesh Babu Chokkalingam, G. Lizia Thankam, and S. K. M. Pothinathan. "Effect of ultrafine natural steatite powder, super plasticizer and VMA on the fresh and hardened properties of self-compacting cement paste and mortar." International Review of Applied Sciences and Engineering 12, no. 3 (2021): 285–92. http://dx.doi.org/10.1556/1848.2021.00279.

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AbstractFor the past few decades innovation in construction material has grown a lot. This leads to special concrete such as self-compacting concrete, geopolymer concrete, self-healing concrete, etc. To prepare a special concrete apart from regular concreting material some sort of special materials was also needed, like mineral and chemical admixtures. Hence it is necessary to study the effect of these admixtures in cement paste and mortar before studying the same in concrete. Hence an attempt is made to study the effect of mineral and chemical admixtures in the fresh and hardened properties of cement paste and mortar. For this study ultrafine natural steatite powder is taken as mineral admixture and polycarboxylic based superplasticizer and glenium stream 2 were taken as chemical admixtures. Ultrafine natural steatite powder was used as additive to cement in various percentages like 0%, 5%, 10%, 15%, 20% and 25%. Superplasticizer and viscosity modifying admixture were taken as 1.5% and 0.5%, respectively. Then various combinations were worked out. To study the fresh property of cement paste consistency, initial setting time and miniature slump cone test were done based on the results yield stress of cement paste also calculated empirically. To study the hardened property compression test on cement mortar was done. Based on the test results it is clear that the addition of ultrafine natural steatite powder increases the water demand hence reduces the workability. On the other hand, it increases the compressive strength up to a certain limit. Adding superplasticizer increases the workability and reduces the water demand and viscosity modifying admixture reduces the bleeding and segregation effects hence increases the compressive strength.

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He, Zhi Min, Jun Zhe Liu, and Tian Hong Wang. "Mechanical Properties of Steam-Cured Concrete with Combined Mineral Admixtures." Advanced Materials Research 168-170 (December 2010): 1535–38. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.1535.

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In precast concrete elements manufacturing, steam-cured concrete incorprating 30% mineral admixtures encountered the problem of too low demoulding compressive strength. To resolve it, this paper mainly studied the influence of mineral admixtures on the compressive strength, the tensile-splitting strength and the flexural strength of the steam-cured concrete. The experimental results indicated that, compared with steam-cured concrete incorprating mineral admixtures, the later strength of steam-cured concrete incorprating 0% mineral admixtures has lower increment degree and its increment of tensile-splitting strength and flexural strength inverted to some extent. The demoulding compressive strength is too low for the high volume fly ash concrete mixtures. The problem of too low demoulding compressive strength is solved by incorprating composites of ground blast furnace slag(GBFS) and fly ash. Different varieties of mineral admixture used in the concretes can produce a certain degree of potentiation.

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Zhao, Mei Li. "The Mechanism of Mineral Admixture in Cement Hydration." Advanced Materials Research 450-451 (January 2012): 1528–31. http://dx.doi.org/10.4028/www.scientific.net/amr.450-451.1528.

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The mineral admixture is one of the indispensable materials for ordinary high-performance concrete. In this paper, the pure cement paste and cement paste replacing by mineral admixture were tested by cement mortar. The SEM analysis of pure cement paste and mineral admixture paste after curing period of 7 days and 28 days.From the picture of SEM after the period of 7 days and 28 days,the cement hydration mechanism was suspected.It could be used for explanating the physical performance and durability performance of the high perfromance concrete with mineral admixture.

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Jin, Dan, Wu Yao, and Hong Zhi Wang. "Studying Blended Cement Paste with Nuclear Magnetic Resonance Relaxation Time." Key Engineering Materials 492 (September 2011): 433–36. http://dx.doi.org/10.4028/www.scientific.net/kem.492.433.

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The pore structure of cement paste has a relationship with its strength and durability. An appropriate method of measurement is a prerequisite to study the pore structure of cement paste. Among many test methods, Nuclear Magnetic Resonance (NMR) relaxation time is a novel testing methods to study pore structure of cement paste. Different from previous research object is limited to white cement, the test sample in this paper is the blended cement paste containing mineral admixture and has been widely used in practical engineering applications. The factors of pore structure are water to cementitious material ratio, kind of mineral admixture, and mineral admixture content. Measure the same sample at four different ages to obtain the relaxation time distribution to reflect the pore structure. The test results show that, in most cases, the distribution curves of the same kind of paste are in good agreement, and the change of relaxation time distribution of the blended cement paste with different ages can be interpreted as the characteristic of the mineral admixtures in cement paste. So the NMR relaxation time is suitable for study on the blended cement paste. However due to side effects caused by iron content and unsaturated water in gel pore, this method needs further improvement.

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Yang, Chaodong, Bangsheng Liu, Changsong Wu, and Xi Qin. "Analysis of Micromechanical Behavior and Adaptive Optimization Algorithm for High Performance Concrete with Complex Mineral Admixtures for Bridges." Journal of Combinatorial Mathematics and Combinatorial Computing 127a (April 15, 2025): 2591–606. https://doi.org/10.61091/jcmcc127a-146.

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The extreme high temperature and erosive environment service environment in bridge construction puts forward higher requirements for high performance concrete and other aspects of performance. In this paper, compound mineral admixture is selected as a research breakthrough, and X-ray diffraction analysis (XRD) and Raman spectroscopy are used to explore the micromechanical behavior of compound mineral admixture in high-performance concrete. In the Raman spectral analysis, the stress distribution of the fitted curve of the compound mineral admixture is more flat and uniform, and the offset of the G’ peak position is higher than that of the reference concrete and the single-mineral-admixture concrete, and the stress can reach 2.5 MPa under 1% strain, showing good interfacial bond, stress transfer efficiency, etc. The physical phase data of the XRD also shows the frost resistance of compound mineral admixture, with the ability to mitigate carbon dioxide, and the ability to reduce the carbon footprint of the concrete, with the ability to reduce the carbon dioxide. The XRD data also show the frost resistance of the compound mineral admixture, which has the performance of slowing down carbonization. The NSGA-II algorithm is introduced and improved to propose a concrete proportion optimization model. The final evaluation function converges from 35 generations and the final value is 0.4558, which achieves the adaptive optimization of compound mineral admixture.

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Bian, Wen Hui, Peng Cheng Li, and Chang He Bai. "Lightweight Aggregate Shotcrete: Part 1." Key Engineering Materials 815 (August 2019): 195–202. http://dx.doi.org/10.4028/www.scientific.net/kem.815.195.

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In this paper, preliminary research on lightweight aggregate shotcrete is carried out. The main discussion is the pumpability and sprayability of light aggregate injection by single-mixed and complex-doped mineral admixture, and the different dosages and different types are studied. The effect of mineral admixture on the physical and mechanical properties of lightweight aggregate shotcrete. The results show that the small amount of fly ash, silica fume and nano-silica can prevent the segregation and bleeding of the mixture. With the increase of the content of silica fume and nano-silica, the pumpability can be reduced. At the same time, the sprayability is increased. It has also been found that, due to the difference in particle size, the mutual complementation of particles between the complex mineral admixtures in terms of physical and mechanical properties results in a significant increase in sprayability and strength.

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Li, Yun Feng. "Microstructure and Properties of High Performance Concrete with Steel Slag Powder." Materials Science Forum 675-677 (February 2011): 503–6. http://dx.doi.org/10.4028/www.scientific.net/msf.675-677.503.

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As an active admixture, super fine steel slag powder can be mixed into concrete to produce high performance concrete. The microstructures between cement paste mixed with steel slag powder and plain cement paste are experimentally studied. The SEM of the microstructures shows that microstructure of cement paste are changed by active mineral admixture, the internal structure of the cement paste are improved. Drying shrinkage of cement mortar with different steel slag kinds and different dosage of admixtures are measured. Experiments results show the effect of steel slag powder on drying shrinkage of cement mortar.

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Kim, Il Sun, Yoon Suk Choi, Chan Kyu Lee, and Eun Ik Yang. "Analytical Study on the Flexural Behavior of Reinforced Concrete Beam with Mineral Admixture under Calcium Leaching Degradation." Materials Science Forum 940 (December 2018): 123–27. http://dx.doi.org/10.4028/www.scientific.net/msf.940.123.

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Calcium leaching degradation could be happened in reinforcement concrete member due to the contact with pure water in underground condition. Thus, it is needed to evaluate the resistance of calcium leaching for concrete mixed with mineral admixtures. So, in this paper, to evaluate the flexural behavior in RC member with mineral admixture under calcium leaching degradation, we investigated the effect of calcium leaching using the non-linear finite-element program. From the results, the load capacity and flexible rigidity of a degraded RC member decrease when the degradation level increases with leaching period. And, regardless of the type of mineral admixtures, finite-element-method analysis effectively showed the characteristics of calcium leaching damaged RC beam.

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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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Journal articles on the topic 'Mineral Admixture'

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