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工程科学与技术:2008,40(5):74-78
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隧道火灾高温后混凝土的力学性能研究
(1.四川大学 建筑与环境学院,四川 成都 610065;2.西南交通大学 机械工程学院,四川 成都610031)
Influence of Elevated Temperature on Mechanical Properties of Concrete in Tunnel Fir
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投稿时间:2007-04-30    
中文摘要: 隧道火灾的高温作用对混凝土的性能有很大影响。基于ISO834标准,对不同高温(100 ℃~700 ℃)后的20个混凝土立方体试件进行了抗压强度试验,拟合了高温作用后混凝土抗压强度与温度及静置时间之间的耦合关系公式,并利用扫描电子显微镜(SEM)对试验后的混凝土试件的内部组织进行了微观分析,获得了混凝土抗压强度随温度升高而逐渐下降的等试验结论。其试验结果可为分析和研究混凝土在不同温度、不同冷却方式、不同静置时间作用下的材性变化情况提供一些依据
中文关键词: 隧道火灾  升温曲线  混凝土  抗压强度
Abstract:The properties of concrete are greatly influenced by tunnel fire.Therefore, based on ISO834 fire curve, compressive experiments were conducted to study the compressive strength variations with increasing temperatures up to 700 ℃, and the formula which shows the coupling correlation between compressive strength and temperature variation based on standing time was established.Then microstructural observations of the concrete specimens by means of scanning electron microscopy (SEM) were obtained. Results showed that the compressive strength gradually decreased with increasing temperatures. These test results can be used for accurately analyzing and investigating the behavior of concrete with different temperatures, cooling modes and standing time.
文章编号:20080513     中图分类号:    文献标志码:
基金项目:国家自然科学基金重大资助项目(50490272)
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阎慧群,雷兵,王清远.隧道火灾高温后混凝土的力学性能研究[J].工程科学与技术,2008,40(5):74-78.
.Influence of Elevated Temperature on Mechanical Properties of Concrete in Tunnel Fir[J].Advanced Engineering Sciences,2008,40(5):74-78.