高温后纤维矿渣微粉混凝土的弯曲性能

【作者】 高丹盈； 李翔宇； 杨淑慧；

【机构】 郑州大学； 同济大学地下建筑与工程系；

【摘要】 通过纤维矿渣微粉混凝土在高温后的弯曲试验,探讨了温度、矿渣掺量、纤维类型与掺量、混凝土强度等级对高温后纤维矿渣微粉混凝土抗折强度和荷载-挠度曲线的影响。结合扫描电镜照片,研究了高温后纤维矿渣微粉混凝土的劣化机理。结果表明,高温后纤维矿渣微粉混凝土弯曲性能随受热温度的升高而不断劣化;钢纤维、矿渣微粉和聚丙烯纤维均会在一定程度上提高高温后混凝土的弯曲性能。通过对试验结果的统计分析,提出了在考虑温度、矿渣微粉掺量和钢纤维掺量影响下的纤维矿渣微粉混凝土抗折强度计算公式。更多还原

【Abstract】 Based on the experiments on flexural properties of fiber reinforced ground granulated blast furnace slag(GGBFS) concrete after high temperature,the influences of temperature,slag content,fiber type and content and concrete strength grade on flexural strength and load-deflection curve of fiber reinforced GGBFS concrete are investigated.The deterioration mechanism of fiber reinforced GGBFS concrete after high temperature is also analyzed by scanned electric microscope(SEM).The results show that the flexural properties of fiber reinforced GGBFS concrete after high temperature are more serious deterioration with the higher temperature.The flexural properties of fiber reinforced GGBFS concrete are ail improved by steel fiber,GGBFS and polypropylene fiber(PP fiber) to some content.Through the analysis on test results,the calculation equations are proposed for flexural strength of fiber reinforced GGBFS concrete,which consider the combined effects of temperature,GGBFS content and steel fiber content.更多还原