Wang Yanfeng, Liu Songhui, Xuan Dongxing, Guan Xuemao, Zhang Haibo
Henan Key Laboratory of Materials on Deep-Earth Engineering, School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China.
Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China.
Materials (Basel). 2020 Oct 29;13(21):4854. doi: 10.3390/ma13214854.
To improve the hardening performance of sulfoaluminate cement-based grouting material (SCGM) and reduce its cost, limestone powder was adopted to replace anhydrite in the control SCGM. The influence of the replacement rate of limestone powder on the hydration, hardening strength, expansion, and microstructure evolution of the SCGM was systematically researched. The results indicated that replacing anhydrite with limestone powder in SCGM can improve the flowability, shorten the setting time, and enhance the compressive strength at early and late stages. When the replacement rate of limestone powder was 20%, the compressive strength of SCGM for 6 h and 28 days increased by 146.41% and 22.33%, respectively. These enhancements were attributed to the fact that fine limestone powder can accelerate the early hydration reaction rate and promote the formation of ettringite due to its nucleation effect. Moreover, due to the presence of limestone powder, mono-carbonate (Mc) can be formed, which would densify the microstructure and refine the pore structure of the hardened SCGM.
为提高硫铝酸盐水泥基灌浆材料（SCGM）的硬化性能并降低其成本，采用石灰石粉替代对照SCGM中的硬石膏。系统研究了石灰石粉替代率对SCGM水化、硬化强度、膨胀及微观结构演变的影响。结果表明，在SCGM中用石灰石粉替代硬石膏可提高流动性、缩短凝结时间，并提高早后期抗压强度。当石灰石粉替代率为20%时，SCGM的6 h和28 d抗压强度分别提高了146.41%和22.33%。这些增强作用归因于细石灰石粉因其成核作用可加速早期水化反应速率并促进钙矾石的形成。此外，由于石灰石粉的存在，可形成单碳铝酸钙（Mc），这会使硬化SCGM的微观结构致密化并细化孔隙结构。
