Page 156 - 《水资源与水工程学报》2022年第1期
P. 156

!33 " ! 1 #                       & ' ( ) & * + , -                               Vol.33No.1
               2022 $ 2 %               JournalofWaterResources&WaterEngineering                 Feb.,2022

            DOI:10.11705/j.issn.1672-643X.2022.01.21


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                 BCDEF:TV33   GHIJK:A    GLMF:1672643X(2022)01015207
                 Evaluationandanalysisofmechanicalpropertiesofhighstrengthepoxy
                               mortarforrepairingcracksinhydraulicconcrete


                                      1
                                                                   2
                                                                                                2
                                                                                     2
                                                     2
                        ZHANGJuntao,MINQiaoling,LIMingchao,ZHANGMengxi,FENGDa
                       (1.YellowRiverEngineeringConsultingCo.,Ltd.,Zhengzhou450003,China;2.StateKeyLaboratory
                           ofHydraulicEngineeringSimulationandSafety,TianjinUniversity,Tianjin300350,China)
                 Abstract:Hydraulicconcreteconstructionsarepronetocracking,whichcompromisesthestructure’sin
                 tegrityandsafety.Torepairthecracksandreinforcethestructure,effectivemeasuresmustbeimplemen
                 ted.Athreepointbendingconcretebeamwithprecastcrackswastakenastheresearchobjecttoinvesti
                 gatethemechanicalpropertyandfailuremodeofthebeam beforeandafteritwasrepairedbyhigh
                 strengthepoxymortar.Meanwhilealaboratorymechanicalexperimentwasconductedtoverifytheaccura
                 cyofthematerialparametersandmodelsettings.Thebondingeffectbetweenthecrackandtheepoxy
                 mortarinterfacewassimulatedusingzerothicknesscohesiveelements.Thefindingsrevealthatthebear
                 ingcapacityoftheconcretebeamrestoredwithhighstrengthepoxymortarperformedevenbetterthanthat
                 oftheconcretebeamwithoutcracks.Withtheincreaseofthecrackheightratiooftheepoxymortar ,the
                 ultimatebearingcapacityoftheconcretebeamincreasedfirstandthenstabilized.Afterachievingitsfinal
                 ultimatebearingcapacity,therepairedconcretebeam’sstrengthrapidlydeteriorated.Finally,acalcula
                 tionformulaforquantifyingtheincrementoftheultimatebearingcapacityofconcretebeamsafterrepair
                 withvariouscrackheightratioswasproposed ,whichcanbeusedtoprovidetechnicalassistanceforthe
                 repairofconcretestructures.
                 Keywords:hydraulicconcrete;highstrengthepoxymortar;crack;repairandreinforcement;three
                 pointbendingexperiment ;mechanicalproperty



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