冻融循环后自密实混凝土单轴受压应力-应变曲线试验研究  

Experiment research on uniaxial compressive stress-strain curve of self-compacting concrete subjected to freeze-thaw cycle

作　　者：谢世光[1] 刘清[1] 韩风霞[1] 高金东[1] 

机构地区：[1]新疆大学建筑工程学院,新疆乌鲁木齐830047

出　　处：《混凝土》2017年第4期11-14,共4页Concrete

基　　金：国家自然科学基金资助项目(51368057);国家自然科学基金资助项目(51468061)

摘　　要：为研究新疆地区自密实混凝土冻融循环后单轴受压应力-应变曲线,采用新疆地区原材料配制自密实混凝土,制作27个100 mm×100 mm×400 mm棱柱体抗压试件,经历0、25、50、75、100、125、150、175、200次冻融循环后,进行单轴受压应力-应变曲线试验。分析了不同冻融循环次数对自密实混凝土峰值应力、峰值应变、泊松比、和单轴受压应力-应变曲线的影响。结果表明:峰值应力随着冻融循环次数的增加而降低;在25、50次冻融循环时,峰值应变逐渐减小,50~200次冻融循环时,峰值应变随着冻融循环次数的增加逐渐增大;泊松比随着冻融循环次数的增加而减小;纵向应力-应变曲线随着冻融循环次数的增加渐趋扁平,与横轴的包围面积减小,自密实混凝土吸收能量的能力变弱。In order to investigate the stress-strain curves of the self-compacting concrete after freeze-thaw cycles in Xinjiang region, con stituent materials of Xinjiang were applied to produce the self-compacting concrete, and 27 （ 100 mm× 100 minx400 ram） prism compression specimens were made, after 0,25,50,75,100,125,150,175,200 cycles of freezing and thawing,the experiment on uniaxial compressive stress- strain curve was conducted.The effects of different cycles of freezing and thawing on the peak stress,peak strain,Poisson＇s ratio, andstress-strain curves of the self-compacting concrete were analyzed.The results show that the peak stress decreases with the increase numbers of freeze-thaw cycles.At the 25 and 50 cycles of freezing and thawing,the peak strain gradually decreases, and the peak strain in- creases with the increase numbers of freeze-thaw cycles at the 50 to 200 cycles of freezing and thawing.The Poisson＇s ratio decreases with the increase numbers of freeze-thaw cycles.Besides,the longitudinal stress-strain curve gradually turns to beflat with the number of freeze-thaw cycles increase, and the area which is surrounded by the X axis also reduces,revealing that the energy absorption capacity of self-compacting concrete weakened.

关 键 词：自密实混凝土 冻融循环 单轴抗压 应力-应变曲线 

分 类 号：TU528.01[建筑科学—建筑技术科学]