IndustrialConstructionVol.53，No.2，2023工业建筑2023年第53卷第2期29混凝土－环氧砂浆界面Ⅰ－Ⅱ型断裂性能试验研究*杭振园1，2喻莹2(1．浙江交通职业技术学院路桥学院，杭州311112;2．汕头大学土木与环境工程系，广东汕头515000)摘要:为研究混凝土强度和界面粗糙度对混凝土－环氧砂浆界面Ⅰ－Ⅱ型复合裂缝扩展和断裂性能的影响，对15个试件进行四点剪切试验，采用数字图像相关(DIC)技术获得试件表面位移场和应变场。基于线弹性断裂理论和试验测得的Ⅰ型裂缝起裂韧度，计算断裂能、变形系数和裂缝尖端Ⅰ型和Ⅱ型应力强度因子。研究结果表明:试件均沿着界面发生典型的准脆性破坏;通过提高混凝土强度可以显著增强界面的断裂性能，但对裂缝尖端处Ⅰ型和Ⅱ型应力强度因子比重的影响较小;试件断裂性能、裂缝尖端应力场和破坏角与界面粗糙度有较大的相关性，当灌砂平均深度�h从0mm增大到0.31mm和0.97mm时，断裂能Gu分别提高了16.1%和66.9%，变形系数Nu分别提高了5.4%和27.6%，Ⅰ型、Ⅱ型应力强度因子比值分别下降了11.96%和39.7%，破坏角分别增大了11.9%和37.8%。关键词:混凝土;环氧砂浆;粗糙度;断裂性能;应力强度因子DOI:10.13204/j．gyjzG22113007ExperimentalＲesearchonFracturePropertiesofMixedModeⅠ-ⅡConcrete-EpoxyMortarInterfaceHANGZhenyuan1，2YUYing2(1．CollegeofＲoad＆Bridge，ZhejiangInstituteofCommunication，Hangzhou311112，China;2．DepartmentofCivilandEnvironmentEngineering，ShantouUniversity，Shantou515000，China)Abstract:InordertoanalyzetheeffectsofconcretestrengthandinterfaceroughnessonthecrackpropagationandfracturepropertiesofmixedmodeⅠ-Ⅱconcrete-epoxymortarinterface，four-pointsheartestswereconductedon15specimens，andthedisplacementandstrainfieldsofthespecimenswereobtainedbydigitalimagecorrelation(DIC)technology．Thefractureenergy，ductilityindexandthestressintensityfactorsofmodeⅠandmodeⅡatthecracktipwerecalculatedbasedonthelinear-elasticfracturemechanicstheoryandfractureinitiationtoughnessofmodeⅠmeasuredbytests．Thetestresultsshowedthatthecrackpropagatedalongtheinterface，whichbelongedtypicalquasi-brittlefailure．Thefractureperformanceoftheinterfacecouldbesignificantlyenhancedthroughincreasingtheconcretestrength，however，therewaslit...
