剥落
耐火性
爆炸物
扫描电子显微镜
材料科学
骨料(复合)
抗压强度
复合材料
残余强度
熔渣(焊接)
有机化学
化学
作者
Xiangwei Liang,Chengqing Wu,Yu Su,Chen Zhu,Zhongxian Li
标识
DOI:10.1016/j.conbuildmat.2018.05.241
摘要
Fire or high temperature is a big challenge to ultra-high performance concrete (UHPC). Strength loss of UHPCs can reach up to 80% after exposure to 800 °C. In this study, a total of six UHPC mixtures were designed and tested after subjected to elevated temperatures up to 1000 °C. The effects of aggregate type, fibre type and heating rate were investigated. Residual compressive strengths and stress-strain relationships were studied. Besides, attention was paid to explosive spalling since UHPCs are usually of compact structure and thus more vulnerable to explosive spalling than other concretes. Scanning electron microscope (SEM) analysis was conducted to help understand the mechanism of variation of internal structure under different temperatures. It was found the mixture containing steel slag and hybrid fibre had excellent fire resistance. After being subjected to 1000 °C, this mixture retained a residual compressive strength of 112.8 MPa or a relative value of 69%.
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