Development of ultra-high performance concrete with high fire resistance

被引：144

作者：

Liang, Xiangwei ^{[1
]}

Wu, Chengqing ^{[1
]}

Su, Yu ^{[1
]}

Chen, Zhu ^{[2
]}

Li, Zhongxian ^{[2
]}

机构：

[1] Univ Technol Sydney, Ctr Built Infrastruct Res, Sch Civil & Environm Engn, Sydney, NSW 2007, Australia

[2] Tianjin Chengjian Univ, Tianjin Key Lab Civil Struct Protect & Reinforcem, Tianjin 300384, Peoples R China

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2018年 / 179卷

基金：

澳大利亚研究理事会;

关键词：

Ultra-high performance concrete; Fire resistance; Steel slag; Steel fibre; Polypropylene fibre; Elevated temperature; HIGH-STRENGTH CONCRETE; STEEL SLAG; MECHANICAL-PROPERTIES; HIGH-TEMPERATURE; ELEVATED-TEMPERATURES; DYNAMIC STRENGTH; THERMAL STRAIN; FINE AGGREGATE; PORE STRUCTURE; COPPER SLAG;

D O I：

10.1016/j.conbuildmat.2018.05.241

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

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 degrees C. In this study, a total of six UHPC mixtures were designed and tested after subjected to elevated temperatures up to 1000 degrees 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 degrees C, this mixture retained a residual compressive strength of 112.8 MPa or a relative value of 69%. (C) 2018 Elsevier Ltd. All rights reserved.

引用

页码：400 / 412

页数：13

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