冲击荷载作用下早强EPS混凝土的力学性能  

Mechanical properties of early-strengthened polystyrene concrete under impact load

作　　者：丁国博[1] 许金余[1,2] 胡泽斌[1] 席峰[1] 白二雷[1] 

机构地区：[1]空军工程大学工程学院机场建筑工程系,西安710038 [2]西北工业大学力学与土木建筑学院,西安710072

出　　处：《振动与冲击》2011年第3期269-273,共5页Journal of Vibration and Shock

基　　金：陕西省自然科学基金(SJ08E210)

摘　　要：采用100 mm分离式霍普金森压杆(split Hopkinson pressure bar,简称SHPB)试验装置,对养护龄期分别为12 h、24 h和36 h的早强聚苯乙烯混凝土(EPS)进行冲击压缩试验,得到了相应的应力-应变曲线,并与养护龄期为28 d的聚苯乙烯混凝土的应力-应变曲线进行比较。结果表明:养护龄期为36 h、28 d的EPS混凝土随着应变率的增加,其冲击压缩强度也相应增加;养护龄期为12 h、24 h的EPS混凝土随着应变率的增加,其冲击压缩强度变化不明显。另外,还研究了试件动态抗压强度与平均应变率的关系和养护龄期对动态抗压强度的影响,证明了EPS混凝土的抗冲击性能随养护龄期的增长而增加。The dynamic mechanical properties of early-strengthened polystyrene（EPS） concrete under 12 hours＇,24 hours＇ and 36 hours＇ maintenance duration were studied using split Hopkinson pressure bar（SHPB） apparatus.The corresponding stress-strain curves were gained and compared with that of EPS concrete under 28 days＇ maintenance duration.The results show that the dynamic compressive strength of EPS concrete under 36 hours＇ and 28 days＇ maintenance duration increase with the enhancing of strain rate,while the dynamic compressive strength of EPS concrete under 12 hours＇ and 24 hours＇ maintenance duration doesn＇t increase obviously with the strain rate.Also the relation between dynamic compressive strength and average strain rate and the influence of maintenance duration on dynamic compressive strength were studied.It is shown that the impact mechanical properties of EPS concrete increase with the elongation of maintenance duration.

关 键 词：聚苯乙烯混凝土 应力-应变曲线 动态抗压强度 应变率 养护龄期 

分 类 号：TU528.572[建筑科学—建筑技术科学]