期刊
MATERIALS CHARACTERIZATION
卷 92, 期 -, 页码 15-25出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2014.02.010
关键词
Atomic force microscopy (AFM); Cement paste; High temperature exposure; Nano-structure; Shrinkage of C-S-H; Image analysis
The degradation of hydration products of cement is known to cause changes in the micro- and nano-structure, which ultimately drive thermo-mechanical degradation of cement-based composite materials at elevated temperatures. However, a detailed characterization of these changes is still incomplete. This paper presents results of an extensive experimental study carried out to investigate micro- and nano-structural changes that occur due to exposure of cement paste to high temperatures. Following heat treatment of cement paste up to 1000 C, damage states were studied by compressive strength test, thermogravimetric analysis (TGA), scanning electron microscopy (SEM) atomic force microscopy (AFM) and AFM image analysis. Using experimental results and research from existing literature, new degradation processes that drive the loss of mechanical properties of cement paste are proposed. The development of micro-cracks at the interface between unhydrated cement particles and paste matrix, a change in C-S-H nano-structure and shrinkage of C-S-H, are considered as important factors that cause the thermal degradation of cement paste. (C) 2014 Elsevier Inc. All rights reserved.
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