（长沙理工大学土木工程学院， 长沙 410004）

［摘要］对9组砂浆棱柱体试件进行静力弹性模量试验及应力-应变全曲线试验，基于试验结果分析了灰砂比、水灰比及石灰膏、粉煤灰掺量等因素对砂浆破坏形态、变形性能及弹性模量的影响。试验表明，砂浆单轴受压棱柱体试件的破坏形态主要为劈裂破坏，主裂缝既有贯通竖向裂缝也有斜裂缝；砂浆弹性模量随着抗压强度的增加呈指数增长；砂浆抗压强度越大，试件破坏程度越剧烈，残余强度越小，砂浆脆性越大；石灰膏掺入砂浆有利于试件延性，粉煤灰掺入砂浆不利于试件延性。采用三次多项式及有理分式分别拟合应力-应变全曲线试验结果得到砂浆应力应变全曲线上升段及下降段，提出了砂浆分段式本构模型及建议参数值，模型计算结果与试验曲线吻合良好，便于工程应用与有限元分析。

［关键词］砂浆； 弹性模量； 单轴受压； 应力-应变全曲线； 本构模型

中图分类号：TU502-6文献标识码：A文章编号：1002-848X(2019)21-0114-06

Experimental research on overall stress-strain curves of  uniaxial compression mortar

Yang Weijun， Yuan Shuai， Yang Chunxia

（School of Civil Engineering, Changsha University of Science & Technology, Changsha 410004, China)

Abstract:Static elastic modulus test and overall stress-strain curve test were carried out on 9 groups of prism specimens of mortar. Based on the test results, the effects of lime-sand ratio, water-cement ratio, lime gypsum and fly ash content on the failure morphology, deformation performance and elastic modulus of mortar were analyzed. The test results show that the main failure modes of uniaxial compressive prism specimens are splitting failure, and the main cracks are both vertical and inclined cracks; the elastic  modulus  of mortar increases exponentially with the increase of compressive strength; the greater the compressive strength of mortar, the more severe the damage of specimens, the smaller the residual strength and the greater the brittleness of mortar; the addition of lime gypsum into mortar is beneficial to the ductility of specimens, while the addition of fly ash into mortar is not conducive to the ductility of specimens. The test results of stress-strain curve were fitted by cubic polynomial and rational fraction to get the rising and falling sections of the stress-strain curve of mortar respectively. The sectional constitutive model and the recommended parameters were put forward. The calculated results of the model are in good agreement with the test curves, which is convenient for engineering application and finite element analysis.

Keywords:mortar; elastic modulus; uniaxial compression; overall stress-strain curve; constitutive model

*国家自然科学基金面上项目（51678067），长沙理工大学土木工程优势特色重点学科创新性项目（16ZDXK03）。

作者简介：杨伟军，博士，教授，博士生导师，Email：yyyaozhijian@163.com。