Effect of Calcium Carbonate Whisker on Shrinkage Reduction and Reinforcement of Alkali-Activated Slag Cementitious Materials

被引：0
|
作者：
Zhao J. [1 ]
Wang A. [1 ]
Zhang Z. [2 ]
Liu K. [1 ]
Sun D. [1 ]
机构：
[1] Anhui Key Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei
[2] School of Materials Science and Engineering, Tongji University, Shanghai
来源：
Jianzhu Cailiao Xuebao/Journal of Building Materials | 2024年 / 27卷 / 04期
关键词：
alkali‑activated slag cementitious material; calcium carbonate whisker; crack; drying shrinkage;
D O I：
10.3969/j.issn.1007-9629.2024.04.010
中图分类号：
学科分类号：
摘要：
In response to the problem of shrinkage and cracking of alkali‑activated slag cementitious material，a new type of micrometer sized fiber—calcium carbonate whisker was used to reduce drying shrinkage and enhance mechanical properties of alkali‑activated slag cementitious material. The effects of different contents of calcium carbonate whiskers on the rheological properties，compressive strength and drying shrinkage of alkali‑activated slag cementitious material were studied，and the micro reinforcement mechanism was explored. The results show that the addition of micrometer sized calcium carbonate whisker has little effect on the fluidity of alkali‑activated slag cementitious material. When the calcium carbonate whiskers’content is 3%，the plastic viscosity of the freshly mixed slurry is 12.33 Pa·s，which is only 14.48% higher than the control group without calcium carbonate whiskers. The 28 d compressive strength of the hardened slurry reaches 105.8 MPa. The drying shrinkage rate of alkali‑activated slag cementitious material decreases with the increase of calcium carbonate whiskers’content. When the calcium carbonate whiskers’content is 5%，its 28 d drying shrinkage rate is only 0.87%，which is 32.56% lower than that of alkali‑activated slag cementitious material without calcium carbonate whiskers. Calcium carbonate whiskers are tightly combined with the matrix，dispersing the stress on the matrix when it is subjected to stress and improving the mechanical properties of alkali‑activated slag cementitious material. The bridging effect of calcium carbonate whisker can effectively delay the formation and propagation of microcracks in alkali‑activated slag cementitious material，and the development of macroscopic crack can be restrained to a certain extent. © 2024 Tongji University. All rights reserved.
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页码：359 / 365and374
相关论文
共 25 条
  • [1] SHI C J., Advances in understanding alkali‑activated materials［J］, Cement and Concrete Research, 78, (2015)
  • [2] DING Zhaoyang, SU Qun, LI Mingze, Et al., Influence of sodium silicate modulus on mechanical properties of geopolymer reclaimed concrete［J］, Journal of Building Materials, 26, 1, (2023)
  • [3] YANG Kai, YANG Yong, LI Xinyuan, Et al., Low temperature hydration behavior and early microstructure of alkali slag cement ［J］, Journal of Building Materials, 23, 5, (2020)
  • [4] ZHENG Yi, WANG Aiguo, LIU Kaiwei, Et al., Analysis of sulfate corrosion resistance and mechanism of different polymer mortars［J］, Journal of Building Materials, 24, 6, (2021)
  • [5] WANG Aiguo, WANG Xingyao, SUN Daosheng, Et al., Research progress in coagulation hardening and regulating techniques of geopolymers［J］, Material Reports, 35, 13, (2021)
  • [6] MA Baoguo, Meng QI, LI Zongjin, Study on the influencing factors and mechanisms of rapid setting of alkali slag cement［J］, Journal of Building Materials, 2, 2, (1999)
  • [7] Influence of the geopolymer formulation on the endogeneous shrinkage［J］, Construction and Building Materials, 298, (2021)
  • [8] ZHANG B，, ZHU H, CHENG Y Z，, Et al., Shrinkage mechanisms and shrinkage‑mitigating strategies of alkali‑activated slag composites：A critical review ［J］, Construction and Building Materials, 318, (2022)
  • [9] YE H L，, RADLINSKA A., Shrinkage mitigation strategies in alkali‑activated slag［J］, Cement and Concrete Research, 101, (2017)
  • [10] COLLINS F, SANJAYAN J G., Effect of pore size distribution on drying shrinking of alkali‑activated slag concrete［J］, Cement and Concrete Research, 30, 9, (2000)
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