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斜拉桥大体积混凝土构件水化热温度效应研究.docx

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斜拉桥大体积混凝土构件水化热温度效应研究 Abstract: Thestudyontemperatureeffectsofhydrationinlargevolumeconcretecomponentsofcable-stayedbridgesisofgreatsignificancetoensurethesafetyandreliabilityofsuchstructures.Thispaperpresentsacomprehensivereviewandanalysisofthetemperatureeffectsofhydrationinlargevolumeconcretecomponentsofcable-stayedbridges.Theresearchresultsshowthat,undertheinfluenceofwater-cementratio,aggregatetypeandsize,mixingmethod,curingconditionsandotherfactors,thepeaktemperatureriseandtemperaturegradientdistributioninconcretearesignificantlyaffected.Inordertoensurethenormalhydrationofconcreteandpreventcrackingcausedbytemperaturerise,appropriatemeasuresshouldbetaken,suchasmixingappropriateamountofmineraladmixturetoimprovetheperformanceofconcreteandsettingupeffectivetemperaturemonitoringandcontrolsystems. Introduction: Cable-stayedbridgeshavebecomeanimportantpartofmodernurbantransportationinfrastructure.Inordertoensurethesafetyandreliabilityofcable-stayedbridges,itisnecessarytopayattentiontothequalitycontrolofconcretecomponents.Thetemperatureeffectofcementhydrationisanimportantfactoraffectingthequalityofconcretecomponents.Whentheconcretecomponentsofcable-stayedbridgesarepoured,theheatofcementhydrationgeneratedintheconcretecancausesignificanttemperatureriseandtemperaturegradientdistribution,whichcancausethermalcrackingandaffectthedurabilityoftheconcrete.Therefore,itisnecessarytostudythetemperatureeffectsofhydrationinlargevolumeconcretecomponentsofcable-stayedbridges,inordertoimprovethequalityofconcretecomponentsandensurethesafetyandreliabilityofcable-stayedbridges. Theoreticalanalysis: Thetemperatureeffectofcementhydrationismainlycausedbytheexothermicreactionofcementhydration.Accordingtotheprincipleofconservationofenergy,theheatgeneratedbycementhydrationisequaltothesumoftheheatabsorbedbywaterandtheheatemittedtothesurroundingenvironment.Theheatabsorbedbywaterismainlyusedtoraisethetemperatureoftheconcrete,whiletheheatemittedtothesurroundingenvironmentismainlyusedtodissipatethehea