桥梁大体积混凝土温控与防裂

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1、西南交通大学硕士学位论文桥梁大体积混凝土温控与防裂姓名：张小川申请学位级别：硕士专业：桥梁与隧道工程指导教师：李亚东20060601西南交通大学硕士研究生学位论文第

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3、页AbstractWithther印iddevelopmentinin抒astmcture，long—spaIlbridgestogetherwith，pilec印s、anchorageblocksandtowersmadeofmassconcretehavefoundwide印plication．Nowadalys，theme衄alreleasespeedofthecementiscomparati

4、velymuchfasterthanthatinthepast，thismakesthememalcrackproblemofthela唱emassconcretemoreoutstaIldingandcor啪on．Theheatofhydrationreleasing舶mthelargemassconcretewhileithardeningleadstothetemperatIlrechangeandconcretecontraction．Thiscausest11eco玎espondmgstresseswhicharethemainfactorstofonll

5、cracksinthemassconcrctesmJcnJres．ObViously，crackswillinnuenceunfaVourablytheuni慨wate单mofinganddurabili移ofstmctllrea11dbecomeahiddentrouble．Thus，crackcontrolmustbeconsideredwhileala唱emassconcretestmctureisinconstnlction，ThemerIllalcrackingproblemoftllelargemassconcreteisVerycomplicated，

6、whichisrelatedtos劬cture；buildingmaterial，constmction，andeventhecircumstance．Thecurrentresearchonheatofhydrationinlargemassconcreteisnotenou曲aIldcomprehensiVe．ThecoVeringareaintherelatedcodesislirIlitedandnarrow．MarlyissuesappearinginconstnlctionhaVetobesolvedbasedonexperience，ramerthan

7、theory．ThisphenomenamayleadtothewasteOflabour，materialaIld6nancialresource．Basedonthefactorresearchwhichleadtothememlalcmckinginlargemassconcreteandcombinedwimmesitetestoftemperaturccon仃olof8拌pilec印intlleTianChiBridgeacrossJinSha砌ver，廿listhesisstudiesa11daJlalyzestherulesforchangingofi

8、蛐ertemperatureneldandtemperatures订essinla唱emassconcrete，anddiscussestheactualefrcctsofmeasuresforheatofhydrationconnDladoptedinco玎s协lction．TktemperahJremonitoringandcrackingcontrolmeasurementsforactllalmassconcrcteinthisthesiswiUnotonlyprovideuse血linformationfbrsimilareng血eeringproject

9、，butalsobeusedasaavailablereferenceforⅡleo巧studyaIld西南交通大学硕士研究生学位论文第l

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11、页test．KeyWords：bridge；pilec印；la唱emassconcretcIheatofhydration；crackcontrol：testcube西南交通大学硕士研究生学位论文第1页第1章绪论1．1大体积混凝土的定义大体积混凝土的定义：一般认为体积很大的现场浇筑的混凝土，其尺寸大到必须采取措施以对付水泥水化发出的热量及伴随发生的体积变化，尽量减少温度裂缝。各种不同类型的大体积混凝土结构，由于所处环境的差