聚合
硅酸盐
水合硅酸钙
硅酸钙
聚合度
雪硅钙石
化学
水合物
矿物学
化学工程
结晶学
聚合物
材料科学
水泥
有机化学
冶金
工程类
作者
Jiaqi Li,Guoqing Geng,Wenxin Zhang,Young‐Sang Yu,David A. Shapiro,Paulo J.M. Monteiro
出处
期刊:ACS Sustainable Chemistry & Engineering
[American Chemical Society]
日期:2018-12-20
卷期号:7 (2): 2316-2326
被引量:41
标识
DOI:10.1021/acssuschemeng.8b05060
摘要
Dicalcium silicate (C2S) is an important clinker mineral in Portland and belite-calcium sulfoaluminate cement. However, there is still a lack of information on the local degree of silicate polymerization and calcium coordination in C2S hydration products. This study aimed to fill this gap by characterizing the hydration of two C2S polymorphs, the β- and α′H- types, using scanning transmission X-ray microscopy coupled with ptychographic imaging. The results showed that the coordination of the Ca species in β- and α′H-C2S had a distorted, cubic-like symmetry, whereas the Ca coordination of calcium silicate hydrate (C-S-H), the main hydration product, was structurally similar to that of tobermorite. The outer hydration product (Op) of both polymorphs exhibited an increasing degree of silicate polymerization over time. The inner hydration product (Ip) of β-C2S polymerized slower than Op; however, the degree of silicate polymerization of both Ip and Op in the α′H-C2S hydration system was comparable. The polymerization degree of Op was relatively heterogeneous, whereas, in α′H-C2S, the polymerization degree was more homogeneous. Ptychographic imaging shows that the Op of α′H-C2S exhibits coarser fibrils than the Op of β-C2S, and a clear Op–Ip interface of hydrated β-C2S is observed.
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