Investigations on the rehydration of recycled blended SCMs cement
Investigations on the rehydration of recycled blended SCMs cement
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DOI：
10.1016/j.cemconres.2022.107036
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发表时间：
2022-11-21
影响因子：
11.4
通讯作者：
Ling, Zheng
中科院分区：
文献类型：
--
作者：
Xu, Lei;Wang, Junjie;Ling, Zheng
本文旨在有助于更好地了解混合SCMs（SF，FA，GGBS，LS）-水泥浆体的脱水和再水化。为此，进行了综合的实验计划，结合QXRD，TG，SEM，等温量热法，MIP和力学测试。热活化温度（达特）对再生混合水泥（RBC）浆体的再水化性能有重要影响，特别是不同前驱体组分的RBC，其最佳达特值不同，导致浆体的微观结构和力学性能不同。RBC糊由内部水合产物（从多孔RBC颗粒再水合）和外部水合产物（围绕分散的颗粒，主要是AFt和AFm）组成的“双重结构”形成。从热活化脱水的非晶相的C（-A）-S-H的重组被发现是负责RBC作为粘合剂的反应性和强度增益。
This paper intends to contribute to a better knowledge of the dehydration and rehydration of blended SCMs(SF, FA, GGBS, LS)-cement pastes. To this end, a comprehensive experimental program combining QXRD, TG, SEM, isothermal calorimetry, MIP and mechanical tests was performed. The thermal activation temperature (TAT) has a significant influence on the rehydration properties of recycled blended cement (RBC) pastes, in particular, different optimum TAT was obtained in different RBC with various precursor components, resulting in pastes with different microstructure and mechanical properties. The RBC paste is formed by a 'dual structure' composed by internal hydration products (rehydrated from porous RBC particles) and external hydration products (surrounding dispersed particles, primarily AFt and AFm). The reformation of C(-A)-S-H from the thermal-activated dehydrated amorphous phases is found to be responsible for the reactivity and strength gain of the RBC as a binder.