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1、外文翻译资料ConstructioncracksinconcretecausesandpreventionConstructioncracksinconcrete,causesandpreventionConstructioncracksofconcretereasonfortheexternalandinternal.Theinitialmainlyreferstotheinternaldefectsofconcreteinearlyconcrete,itsinternalhardeningprocesswillexistnum
2、erousmicro-pores,air-pocketandmicrocracks,Externalreferstotheloadreason:temperaturecrack,dryshrinkageeffectetc.Inthese,canproducevariousformsofconcretecracks.Tograsptheconstructionprocessofrawmaterials,inpouringprocessconfigurationofprogressandthickness,grasptimelymai
3、ntenanceworkwell,whichcanavoidconcretecracks.A,Thecauseofthetear1.TheinitialdefectsofconcreteConcreteiscomposedofcement,sandaggregate,mixedwithwaterandothermaterialsandformationofheterogeneitybrittlematerials.Inthebeginning,becausehardenedconcreteconstructionanddeform
4、ation,aseriesofproblems,suchasconstraintintheconcreteshapesclerosiswillexistnumerousmicro-pores,air-pocketandmicrocracksofconcretethatusuallycalledinitialdefects.Microcracksisusuallyacracksintheconcrete,bearing,andsomeotherfunctionnotharm.Butunderload,temperatureofcon
5、crete,shrinkageandfunction,microcrackswillbeexpandedandconnectivity,andfinallyformthevisiblecracksofconcrete,macroscopiccrack,saiditwastheuseofconcretestructure,propertiesanddurabilityofadverseeffects.2.TheloadfactorDuetothetensilestrengthofconcretestructureorstructur
6、es,smallasapartoftheexternaleffectsofstressthanconcretetensilestrength,willcrack.Therefore,theconcreteintheloadandtheload,canproduceacrack.Toloadthecrack,canproducebyreasonabledesignandconstructiontoprevent.Fortheloadofcrack,duetoreasons,itishardtohandleandprevent.The
7、morecommonthanloadfactorshavetemperature,dryshrinkage,settlingcontractiondeformation,plasticshrinkagedeformation,etc,inthesefunction,canmakeconcreteinsidetensilestress.3.BigvolumeconcretecrackformationreasonsMassiveconcretecrackingreasonscanbedividedintotwotypes:oneis
8、thestructuralcracks,iscausedbyexternalload,2itismaterialofcrackisnotcausedbythechangesofdeformationandtemperaturestressandis
