第54卷第19期2023年10月Vol.54No.19Oct.2023·2317·建筑技术ArchitectureTechnology交通枢纽工程超缓凝混凝土配制与应用丁帅,宋蕴桥,郑文才,李雏峰,丁怀林,杨博文(北京建工新型建材有限责任公司,100015,北京)摘要:超缓凝混凝土具有凝结时间长,可长时间保持较高工作性能的特点,适用于大体积混凝土、连续施工时间要求较长的工程,一般通过降低水泥用量、提高粉煤灰掺量或提高外加剂缓凝组分,延长混凝土凝结时间,但会导致混凝土拌合物工作性差、强度低、生产控制难等问题,并且受温度、施工环境等影响较大。通过探究水胶比、外加剂掺量、砂含泥量对超缓凝混凝土凝结时间和强度的影响规律,成功配制出初凝时间为51h左右、终凝为70h左右的C35超缓凝混凝土,60d抗压强度达到46.3MPa,并成功应用于北京某交通枢纽工程。关键词:超缓凝混凝土;抗压强度;凝结时间中图分类号:TU5文献标志码:B文章编号:1000–4726(2023)19–2317–03PREPARATIONANDAPPLICATIONOFSUPER-RETARDINGCONCRETEINTRANSPORTATIONHUBENGINEERINGDINGShuai,SONGYun-qiao,ZHENGWen-cai,LIChu-feng,DINGHuai-lin,YANGBo-wen(BCEGAdvancedConstructionMaterialsCo.,Ltd.,100015,Beijing,China)Abstract:Super-retardingconcreteischaracterizedbylongsettingtimeandhighworkingperformanceforalongtime.Itissuitableforprojectswithmassconcreteconstructionandlongcontinuousconstructiontime.Generally,thesettingtimeofconcreteisextendedbyreducingtheamountofcement,increasingthecontentofflyashorimprovingtheretardingcomponentsofadmixture.However,thiswillleadtopowerworkabilityandlowstrengthofconcretemix,difficultyinproductioncontrolandotherproblems.Inaddition,thesettingtimeisgreatlyaffectedbythetemperatureandconstructionenvironment.Byexploringtherulesofimpactofwater-cementratio,admixturecontentandsiltcontentofsandonthesettingtimeandstrengthofsuper-retardingconcrete,C35super-retardingconcretewaspreparedsuccessfully,ofwhichtheinitialsettingtimeisabout51handthefinalsettingtimeisabout70h.Its60dcompressivestrengthisupto46.3MPa.IthasbeensuccessfullyappliedtoatransportationhubprojectinBeijing.Keywords:super-retardingconcrete;compressivestrength;settingtime1工程概况桩基基础是北京某交通枢纽工程建设的基础...