第19卷第94期交通节能与环保Vol.19No.22023年04月TransportEnergyConservation&EnvironmentalProtectionApril.2023doi:10.3969/j.issn.1673-6478.2023.02.029提升UHPC早期抗裂性能试验研究陈光伟1,刘龙龙2,马千越1,王少鹏2,赵尚传2(1.江苏省交通工程建设局江苏南京210004;2.交通运输部公路科学研究所北京100088)摘要:为解决UHPC易开裂的问题,本研究进行了不同掺量微膨胀材料的凝结时间、收缩试验和不同养护方法的抗裂能力试验,研究了微膨胀材料掺量对凝结时间、收缩率,以及不同的养护方法对混凝土抗裂能力的影响。试验结果表明:随着微膨胀材料快硬水泥掺量的增加,混凝土的凝结时间和收缩率均呈现减小的趋势;对比喷雾养护和土工布湿喷养护对UHPC浇筑板材的影响,土工布湿喷养护对UHPC抗裂更有利。综合考虑微膨胀材料对UHPC材料硬化时间和收缩的影响,以及不同养护手段对混凝土抗裂能力的影响,选择微膨胀材料掺量为15%和土工布湿喷养护对UHPC抗裂最有利。关键词:抗裂;微膨胀;凝结时间;收缩;土工布中图分类号:U416.216文献标识码:A文章编号:1673-6478(2023)02-0160-05ExperimentonCrackResistancePropertiesofUHPCCHENGuangwei1,LIULonglong2,MAQianyue1,WANGShaopeng2,ZHAOShangchuan2(1.JiangsuTrafficEngineeringConstructionBureau,NanjingJiangsu210004,China;2.ResearchInstituteofHighway,MinistryofTransport,Beijing100088,China)Abstract:TosolvetheproblemthatUHPCiseasytocrack,thesettingtimeandshrinkagetestofdifferentmicro-expansionmaterialsandthecrackresistancetestwithvaryingcuringmethodswerestudied.Theeffectsofmicro-expansionmaterialcontentonsettingtime,shrinkagerateanddifferentcuringmethodsonthecrackresistanceofconcretewerestudied.Thetestresultsshowthatthesettingtimeandshrinkagerateofconcretedecreasewiththeincreaseofthecontentofmicro-expansivematerial.ComparingtheeffectsofspraycuringandgeotextilespraycuringonUHPCpouringplate,geotextilespraycuringismorefavourableforUHPCcrackresistance.Consideringtheinfluenceofmicro-expansivematerialsonthehardeningtimeandshrinkageofUHPCmaterials,besidestheimpactofdifferentcuringmethodsonthecrackresistanceofconcrete,themicro-expansivematerialcontentof15%andgeotextilewetspraycuringareselectedforUHPCcrack...