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（長沙理工大學(xué)土木工程學(xué)院， 長沙 410004）
［摘要］對9組砂漿棱柱體試件進行靜力彈性模量試驗及應(yīng)力-應(yīng)變?nèi)€試驗，基于試驗結(jié)果分析了灰砂比、水灰比及石灰膏、粉煤灰摻量等因素對砂漿破壞形態(tài)、變形性能及彈性模量的影響。試驗表明，砂漿單軸受壓棱柱體試件的破壞形態(tài)主要為劈裂破壞，主裂縫既有貫通豎向裂縫也有斜裂縫；砂漿彈性模量隨著抗壓強度的增加呈指數(shù)增長；砂漿抗壓強度越大，試件破壞程度越劇烈，殘余強度越小，砂漿脆性越大；石灰膏摻入砂漿有利于試件延性，粉煤灰摻入砂漿不利于試件延性。采用三次多項式及有理分式分別擬合應(yīng)力-應(yīng)變?nèi)€試驗結(jié)果得到砂漿應(yīng)力應(yīng)變?nèi)€上升段及下降段，提出了砂漿分段式本構(gòu)模型及建議參數(shù)值，模型計算結(jié)果與試驗曲線吻合良好，便于工程應(yīng)用與有限元分析。
［關(guān)鍵詞］砂漿； 彈性模量； 單軸受壓； 應(yīng)力-應(yīng)變?nèi)€； 本構(gòu)模型
中圖分類號：TU502-6文獻標(biāo)識碼：A文章編號：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
*國家自然科學(xué)基金面上項目（51678067），長沙理工大學(xué)土木工程優(yōu)勢特色重點學(xué)科創(chuàng)新性項目（16ZDXK03）。
作者簡介：楊偉軍，博士，教授，博士生導(dǎo)師，Email：yyyaozhijian@163.com。
