—1—2023年第1期黑龙江水利科技No.1.2023（第51卷）HeilongjiangHydraulicScienceandTechnology（TotalNo.51）不利环境下水工混凝土抗裂性试验研究张成哲（营口市水利勘测建筑设计院，辽宁营口115000）摘要：文章应用环境试验箱模拟盐渍土侵蚀及大温差不利环境下，不同矿粉-粉煤灰掺量及基准组水工混凝土的抗折抗折强度及抗裂性能。试验表明：矿物掺合料的掺入可以提高水工混凝土强度增长速率和抗裂性能，但会降低其力学性能；掺20%矿粉和15%粉煤灰混凝土较基准混凝土3~14d抗压强度增长率提高164.7%，28d断裂能提高50.74%，早期具有较高的抗压和抗折强度增长速率；经SEM微观分析，掺入适量的矿物掺合料可以明显减小裂缝宽度，改善混凝土孔隙结构、密实度及其抗裂性能。关键词：不利环境；矿物掺合料；抗裂性能；微观结构中图分类号：TV431文献标识码：AExperimentalStudyonCrackResistanceofHydraulicConcreteExperimentalStudyonCrackResistanceofHydraulicConcreteunderAdverseEnvironmentunderAdverseEnvironmentZHANGCheng-zhe(YingkouUrbanWaterConservancyInvestigationConstructionDesignInstitute,Yingkou115000,China)Abstract：Inthispaper,theenvironmentaltestchamberisusedtosimulatetheflexuralstrengthandcrackresistanceofhydraulicconcretewithdifferentslave-flyashcontentandreferencegroupundertheadverseenvironmentofsalinesoilerosionandlargetemperaturedifference.Theresultsshowthattheadditionofmineraladmixturescanimprovethestrengthgrowthrateandcrackresistanceofhydraulicconcrete,butreduceitsmechanicalproperties.Comparedwiththebenchmarkconcrete,theconcretemixedwith20%mineralpowderand15%flyashhas164.7%highercompressivestrengthgrowthrateat3-14dand50.74%higherfractureenergyat28d,andhashighercompressiveandflexuralstrengthgrowthrateatearlystage.SEManalysisshowsthattheproperamountofmineraladmixturescansignificantlyreducethecrackwidthandimprovetheporestructure,compactnessandcrackresistanceofconcrete.Keywords：adverseenvironment;mineraladmixture;anti-crackingability;microstructure中国东北地区具有干燥少雨、受盐渍土侵蚀、昼夜温差大等特点，这种不利环境对水工构筑物耐久性能构成严重影响。混凝土水化放热引起的内部温度场变化以及所处环境的昼夜温差极易导致混凝土收...
