粗骨料类型对混凝土高温后抗压强度的影响研究  

Influence of aggregate type on compressive strength of concrete after exposure to high temperatures

作　　者：姚建国[1] 袁广林[1] 宋永娟[1] 温发明[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：《混凝土》2011年第2期89-91,94,共4页Concrete

基　　金：国家自然科学基金(59978008)

摘　　要：对不同骨料类型的混凝土经历不同温度、不同冷却方式后的力学性能进行研究。试验结果表明:高温后不同骨料类型的混凝土立方体抗压强度随着受热温度的升高总体呈下降趋势;不同冷却方式对高温后混凝土立方体的抗压强度有一定影响,并且随静置时间的增加而增加;不同骨料混凝土立方体试块静置后力学性能有较大差异。当温度小于400℃时,硅质骨料混凝土试块抗压强度较大,当温度大于400℃时,钙质骨料混凝土试块表现出良好的耐火性。这些研究成果可为今后钢筋混凝土结构的抗火性能及火灾后的损伤评估与修复提供参考。Mechanical properties of concrete with different aggregate type after different heating temperature and cooling modes are investigated.Test results show that：after high temperature,the compressive strength of concrete with different aggregate type decreases with the increase of heat-ing temperature.Cooling modes have impacts on the residual compressive strength of concrete cubes after high temperature,also the impacts increase with the increase of standing time.However,there is much difference between mechanical properties of concrete with different aggregate type.When the heating temperature is lower than 400℃,concrete with siliceous aggregate appears good resistance of fire.These test results provide scientific proofs for further evaluation and analysis of mechanical properties of RC structure after exposure to high temperatures.

关 键 词：高温 粗骨料 静置时间 抗压强度 

分 类 号：TU528.041[建筑科学—建筑技术科学]