骨料类型对混凝土棱柱体高温后力学性能影响研究  

Experimental study on influences of aggregate types on mechanical property of concrete prisms after exposure to high temperatures

作　　者：周立欣[1] 贾文亮[1] 张必亮[1] 李世鸣[1] 

机构地区：[1]中国矿业大学力学与建筑工程学院,江苏徐州221008

出　　处：《河南城建学院学报》2011年第1期28-32,共5页Journal of Henan University of Urban Construction

基　　金：国家自然科学基金(59978008)

摘　　要：对不同骨料类型的混凝土棱柱体经历不同温度、不同冷却方式后的力学性能进行研究。试验结果表明,棱柱体的峰值应力下降速度和峰值应变增长幅度均随温度的升高而变大;相同条件下高温喷水冷却后混凝土棱柱体的峰值应力下降速度和峰值应变增长幅度均大于高温自然冷却后的试验值;高温喷水冷却后硅质骨料混凝土棱柱体的峰值应力下降速度和应变增长速度分别为钙质骨料混凝土的1.08倍和1.58倍。这些研究成果为进一步研究混凝土结构的抗高温性能及其损伤评估提供了一定的参考。This experimental study investigated the mechanical properties of concrete prisms with different aggregate types which have been cooled under different cooling regimes after exposure to high temperatures.Test results show that both the decreasing speed of maximum stress and the increasing extent of maximum strain of concrete prisms increase as the heating temperature rises.Under the same condition,the decreasing speed of maximum stress and the increasing extent of maximum strain after water-cooling are higher than those after air-cooling,the values of the former are 1.08 and 1.58 times of the latter,respectively.These test results provide scientific proofs for further evaluation and analysis of mechanical properties of reinforced-concrete structures after exposure to high temperatures.

关 键 词：高温 冷却方式 粗骨料 力学性能 

分 类 号：TU502.6[建筑科学—建筑技术科学]