crtsⅱ型无砟轨道板混凝土配合比设计与施工技术分析word格式论文.docxVIP

总体目标的同时，极大地降低了混凝土生产成本，为企业创造了500 多万元的经济效益。关键词：CRTSⅡ型无砟轨道板；混凝土配合比；耐久性；质量控制IIAbstractTheballastlessslabtrackofCRTSIIwiththeadvantagesofrunningsmoothly andcomfortablyunderahigh-speed,ismostwidelyappliedinChinacurrently.The concreteofballastlessslabtrackofCRTSIIisthekeymaterialoftheslabtrack structure,itsperformancedirectlyaffectsthedurabilityandsecurityofthetrack structure,thepreparationandconstructionofthiskindoftrackstructureisoneofthe coretechnology.Inthisresearchtheoptimizationdesignwasused,combinedwith theconcretecuringprocessmatchingbreakthroughtheconcretecuringconditionsin 16htoreachthetechnicalbottleneckofstrippingstrengthin48MPa,andacomplete setofballastlessslabtrackofCRTSIIproductiontechnologyofconcreteconstruction wasgotten,topromoteourcountryshigh-speedrailwayconstructionand development,andperfectthesystemofthehigh-speedrailwayconstructionwhich haveagreat significance.Themain works and the innovations ofthis paperareasfollows:ThemixproportionwasoptimizedusingtheP.II42.5Portlandcement,S95 mineralpowder,classIIflyash,polycarboxylicacidofhighefficiencywater reducingagentandhigh-qualityaggregateswiththewater/cementratioof0.27-0.29, sandcoarseaggregateratioof34%-38%,flyashmineralpowdercomposite compatibility(mineralpowder:flyash=50%:50%)contentundertheconditionof 10%-15%.Basedonwhich,aballastlessslabtrackofCRTSIIconcretewiththe compressivestrength marethan 48 MPaafter 16hwas achieved.Theconcretewascuredunderfourstagesofstop,heatingandconstant temperatureandcooling.Thetemperatureconcreteintothemold,templates temperaturewereadjustedaccordingtotheclimatechange,concretehydration processwascontrolled,theearlystrengthwasimproved,andatthesametime,thetopcuring temperature ≯55 ℃, warming and cooling rate ≯15 ℃/ h wascontrolled to prevent the concrete crack and ensure the quality of track plate production.Thedurabilityofslabtrackconcretewasstudied，andtheinfluencingfactorsofprimaryand secondaryfor electricfluxrespectivelyare as follows：water-binderratio,IIIflyash,airconten