期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 195, 期 -, 页码 19-27出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2018.11.046
关键词
Drying; Compressive strength; Moisture content; Porosity; MIP; FEIM; Strength-porosity-saturation model
资金
- National Key Research and Development Program of China [2017YFC0804602]
- National Natural Science Foundation of China [51839007, 51879141]
- State Key Laboratory of Hydroscience and Engineering [2016-KY-05]
Concrete structures can at times be exposed to temperatures of up to 105 degrees C. In this study, the compressive strength of concretes with different water-cement ratios during drying at 105 degrees C is measured. The results indicate that, with increasing moisture content, the compressive strength decreases initially and then increases. The effect of moisture content on compressive strength increases with the increasing porosity. In addition, the competitive effects of capillary pressure and microcracks on the evolution of the compressive strength during the drying process are discussed through mercury intrusion porosimetry (MIP) and the fluorescent epoxy impregnation method (FEIM). Finally, based on the strength-porosity model reported by Ryshkewitch, a strength-porosity-saturation model, which considers the effect of moisture content and porosity on the compressive strength, is proposed. (C) 2018 Elsevier Ltd. All rights reserved.
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