（1 西安理工大学土木建筑工程学院， 西安 710048； 2 西安理工大学省部共建西北旱区生态水利国家重点实验室, 西安 710048；3 郑州科技学院土木建筑工程学院, 郑州 454000）

［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。

［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

中图分类号：TU502+.6文献标识码：A文章编号：1002-848X(2019)05-0125-06

Experimental study on mechanical properties of high ductile concrete under freezing-thawing cyclic erosion

Kou Jialiang1,2, Lin Yadang1,3, Xi Fangyong1

(1 School of Civil Engineering & Architecture, Xi′an University of Tcchnology, Xi′an 710048, China；2 State Key Laboratory of Eco-hydraulics in Northwest Arid Region， Xi′an University of Technology, Xi′an 710048, China；3  School of Civil Engineering & Architecture, Zhenzhou University of Science & Technology, Zhenzhou 454000, China)

Abstract: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.

Keywords:high ductile concrete(HDC); freezing-thawing cycle; freezing-thawing constitutive relation; uniaxial compression; dynamic elastic modulus

*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)。

作者简介：寇佳亮，博士，副教授,Email: jialiangkou0918@163.com。