材料科学
微观结构
钙矾石
水泥
煅烧
热分解
热稳定性
硅酸盐水泥
复合材料
灰浆
饱和(图论)
分解
矿物学
冶金
化学工程
化学
工程类
组合数学
催化作用
有机化学
生物化学
数学
作者
Yubin Cao,Yanru Wang,Zuhua Zhang,Yuwei Ma,Hao Wang
标识
DOI:10.1016/j.cemconcomp.2022.104832
摘要
The mechanical properties, phase evolution, microstructure development and (re)hydration properties of limestone calcined clay cement (LC3) paste and mortar were investigated to understand their thermal stability under moderate temperatures (100–400 °C). The residual compressive strengths of LC3 and Portland cement (PC) mortars kept constant or slightly increased from ambient to 300 °C, and sharply dropped at 400 °C. At 100 °C, monocarboaluminate (Mc) and ettringite (AFt) converted into hemicarboaluminate (Hc) and monosulfate (Ms), and caused partial dehydroxylation of C-(A)-S-H. As the temperature increased, at 200–300 °C, due to the decomposition of large fraction of hydration products, macroscopic cracks and microstructure damage occurred. At 400 °C, the mean chain length (MCL) of C-(A)-S-H gel decreased, accompanied by the shift of Si and Al-coordination number and the formation of active sites. Under water saturation conditions, the microstructure showed self-repairing performance.
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