CA-CAF多相体系在水和硫酸盐水溶液中的溶解及早期水化相互作用

Dissolution and Early Hydration Interaction of CA-CAF Polyphase in Water and Aqueous Sulfate Solutions.

作者信息

Ye Shaoxiong, Feng Pan

机构信息

College of Civil Engineering, Huaqiao University, Xiamen 361021, China.

Jiangsu Key Laboratory of Construction Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, China.

出版信息

Materials (Basel). 2025 Jul 20;18(14):3399. doi: 10.3390/ma18143399.

DOI:10.3390/ma18143399

PMID:40731609

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12299256/

Abstract

The concurrent dissolution and early hydration of tricalcium aluminate (CA) and tetracalcium aluminoferrite (CAF) critically govern early-stage reaction dynamics in Portland cement systems. However, their mutual kinetic interactions during reaction, particularly sulfate-dependent modulation mechanisms, remain poorly understood. Using in-situ digital holographic microscopy (DHM), this study resolved their interaction mechanisms during co-dissolution in aqueous and sulfate-bearing environments. Results reveal asymmetric modulation: while CAF's dissolution exhibited limited sensitivity to CA's presence, CA's kinetics were profoundly altered by CAF through sulfate-concentration-dependent pathways, which originated from two competing CAF-mediated mechanisms: (1) suppression via common-ion effects, and (2) acceleration through competitive sulfate species adsorption. These mechanistic insights would provide a roadmap for optimizing cementitious materials through optimized reaction pathways.

摘要

铝酸三钙（CA）和铁铝酸四钙（CAF）的同时溶解和早期水化对波特兰水泥体系的早期反应动力学起着关键作用。然而，它们在反应过程中的相互动力学作用，特别是硫酸盐依赖的调节机制，仍知之甚少。本研究使用原位数字全息显微镜（DHM），解析了它们在含水和含硫酸盐环境中共溶解过程中的相互作用机制。结果揭示了不对称调节：虽然CAF的溶解对CA的存在表现出有限的敏感性，但CA的动力学通过CAF以硫酸盐浓度依赖的途径发生了深刻改变，这源于两种相互竞争的CAF介导机制：（1）通过同离子效应抑制，以及（2）通过竞争性硫酸盐物种吸附加速。这些机理见解将为通过优化反应途径优化胶凝材料提供路线图。