Page 160 - 《水资源与水工程学报》2022年第3期
P. 160

!33 " ! 3 #                       & ' ( ) & * + , -                               Vol.33No.3
               2022 $ 6 %               JournalofWaterResources&WaterEngineering                 Jun.,2022

            DOI:10.11705/j.issn.1672-643X.2022.03.20


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              Influenceofcuringenvironmentonrestrictedshrinkagecrackingofconcrete

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               ZHANGLei ,WANGZhihua ,TONGJiyou,ZHANGHaili,WUGangquan,CAOZunyi
                       (1.YellowRiverInstituteofHydraulicResearch,YellowRiverConservancyCommissionoftheMinistryof
                         WaterResources,Zhengzhou450003,China;2.HenanEngineeringResearchCenterofHydropower
                           EngineeringAbrasionTestingandProtection,Zhengzhou450003,China;3.CollegeofWater
                             ConservancyandHydropowerEngineering ,HohaiUniversity,Nanjing210098,China;
                             4.Xing’anLeagueHehaiWaterSupplyCo.,Ltd.,Ulanhot137400,China;5.Henan
                                   ZhiheEngineeringTechnologyCo.Ltd. ,Zhengzhou450003,China)
                 Abstract:Undertheextremeenvironmentinhighaltitudeareas,cracksarepronetodevelopinthe
                 processofconcretepouringandcuring ,whichaffectstheengineeringqualityandsafeoperationofthe
                 structure.Inthispaper ,theringmethodconcreterestrictedshrinkagecrackingtestiscarriedout,the
                 effectsofdifferenttemperatures(-5,10,25,40℃)andhumidity(50%,65%,80%)ontheearly
                 restrictedshrinkagecrackingofconcretearestudiedtorevealthemechanismofconcretecrackingatthe
                 earlystage.Theresultsshowthatthecompressivestrengthandelasticmodulusofearlyconcreteincrease
                 withtheincreaseofcuringtemperatureandhumidity ,andtheincreaseofcompressivestrengthwithcu
                 ringageismoreobviousthanthatofelasticmodulus;withthedecreaseofcuringtemperatureorincrease
                 ofcuringhumidity ,thedryingshrinkageandselfshrinkageofconcreteisreduced,whichinturnwould
                 reducetheinternalstressofconcreteandimproveitscrackingresistance;thepredictionmodelofearly
                 restrictedshrinkagecrackingofconcreteisproposed ,withwhichthetimeofrestrictedshrinkagecracking
                 ofearlyconcretecanbeaccuratelypredicted.Thefindingscanprovidebasicdatasupportforthedevel
                 opmentofconcretecrackingcontroltechnology.
                 Keywords:concrete;restrainedshrinkage;curingenvironment;ringtest;curingage




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