摘要
高延性混凝土(HDC)具有良好的拉伸应变-硬化特性和裂缝控制能力,受拉状态下产生多条细密裂纹,这使得HDC极有可能具有良好的抗冻性能。基于此,通过采用快速冻融方法对21个HDC试件进行了冻融循环试验来研究HDC的抗冻性能,其中,3个HDC棱柱体试件进行冻融循环试验,18个HDC立方体试件进行不同冻融循环次数下单轴受压试验,测定不同冻融循环次数作用后HDC的表观特征以及各项基本力学性能,包括极限承载力、动弹性模量、峰值应变和裂缝状态。试验结果表明,经过300次冻融循环后HDC具有良好的裂缝控制能力,试件出现较少的细密裂纹,表现出良好的抗冻性能。通过分析HDC冻融试验应力-应变曲线,得到HDC冻融本构关系曲线,且与试验曲线对比,发现本构模型曲线与试验曲线较为吻合。
High ductile concrete(HDC)has good tensile strain-hardening properties and crack control ability,and many fine cracks produce under tension,which makes it possible that HDC has good frost resistance.Based on this,21 HDC specimens were tested by rapid freezing-thawing method to study the freezing-thawing resistance of HDC.Among them,3 HDC prism specimens were tested by freezing-thawing cycle,18 HDC cube specimens were tested under uniaxial compression under different freezing-thawing cycles,and the apparent characteristics and basic mechanical properties of HDC after different freezing-thawing cycles were measured,including ultimate bearing capacity,dynamic elastic modulus,peak strain and crack state.The test results show that after 300 freezing-thawing cycles,HDC has good crack control ability,and there are fewer fine cracks in the specimens,showing good frost resistance.By analyzing the stress-strain curve of HDC freezing-thawing test,the constitutive relation curve of HDC freezing-thawing test is obtained,and constitutive relation model curve is in good agreement with the experimental curve.
作者
寇佳亮
林亚党
席方勇
Kou Jialiang;Lin Yadang;Xi Fangyong(School of Civil Engineering&Architecture,Xi'an University of Tcchnology,Xi'an 710048,China;State Key Laboratory of Eco-hydraulics in Northwest Arid Region,Xi'an University of Technology,Xi'an 710048,China;School of Civil Engineering&Architecture,Zhenzhou University of Science&Technology,Zhenzhou 454000,China)
出处
《建筑结构》
CSCD
北大核心
2019年第5期125-130,共6页
Building Structure
基金
国家自然科学基金资助项目(51408487)
中国住建部科学技术资助项目(2014-K2-037)
中国博士后科学基金第56批面上资助项目(2014M562437)
陕西省自然科学基金资助项目(2014JQ7292)
陕西省教育厅专项科学研究计划资助项目(14JK1516)
陕西省博士后科学基金资助项目
西安市建设科技项目(SJW2015-09)
西安理工大学科学研究计划资助项目(118-211403)
关键词
高延性混凝土
冻融循环
冻融本构关系
单轴受压
动弹性模量
high ductile concrete(HDC)
freezing-thawing cycle
freezing-thawing constitutive relation
uniaxial compression
dynamic elastic modulus
