Yuyang Pang, Qun Tang, Zhenqi Li, Danying Gao, Lin Yang, Dongxu Liu, Dawei Li
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引用次数: 0
Abstract
In order to accurately evaluate the deterioration of the mechanical properties of steel fibre reinforced concrete (SFRC) after exposure to elevated temperature, it is particularly important to study the bonding properties between steel fibre and concrete matrix. In this paper, four types of steel fibre and five types of cement mortars with different strengths were selected to investigate the bond behaviour of the steel fibre-mortar interface after exposure to elevated temperature. The results showed that the compressive strength and flexural strength of each mortar decreased significantly after elevated temperature treatment, and the attenuation degree of flexural strength was greater than that of the compressive strength. In addition, the ultimate pull-out load of specimen with the straight steel fibre gradually decreased with the increase of temperature. However, the ultimate pull-out load of specimen with the end-hooked steel fibre had no significant change between 20°C and 400°C. When the temperature exceeded 400°C, the ultimate pull-out load gradually decreased with the increase of elevated temperature. Subsequently, the damage mechanism of the interface between steel fibre and mortar matrix under condition of elevated temperature was analyzed by testing the interfacial microstructure and phase change of cement paste. Finally, the calculation formula of the ultimate bond strength and temperature was established.
期刊介绍:
Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance.
Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.