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Studyonthecouplingeffectandfailuremechanism ofmeshfabric
reinforcedpolyureacoating
LIBingqi,ZHANGJilei,LIUXiaonan,MENGTianyi
(StateKeyLaboratoryofSimulationandRegulationofWaterCycleinRiverBasin,ChinaInstituteofWaterResources
andHydropowerResearch ,Beijing 100038,China)
Abstract:Polyureaisanexcellentcaulk - sealingandsurfaceanti - seepagematerial.Compositecoatingcomposed
ofpolyureaandmeshfabriccanbefoundinsomeprojects.However ,thiscombinationisonlyasimpleimitationof
thetraditionalpolyurethane - mesh - fabriccompositecoatingstructure.Researchonthecouplingbehaviorand
failuremechanismofthiscompositecoatingcanrarelybefound.Problemssuchaspeeling,hydrolysis,andpoor
durabilityoccurred.Thisstudyinvestigatedthecouplingeffectbetweenthemeshfabricandpolyureasubstrate ,and
exploredthemechanicalbehaviorandfailurepatternofmeshfabricreinforcedpolyureacoating.Thedeformation
behaviorandload - carryingcapacityofdifferentmaterialcombinationswerealsoanalyzed.Themainconclusions
areasfollows :Fabricfiberfractureleadstoinstantaneousstresspulseinthepolyureasubstrate,fiberfracturesur
faceandstress - pulse - inducedmicrocracksleadtotheoverallcross - sectionpull - offfailure.Thepolyureamaterial
exhibitsahigherstrength.Meshfabricinduceddefectsleadstoanelongationdecreaseofmorethan75%.The
meshfabriccouldunderminethestrengthanddeformationcapacityofthepolyureasubstrate ,playinganegative
roleonthematerialperformance.Thepolyurethanematerialgenerallyexhibitsalowerstrength.Themeshfabric
couldincreasethetensilestrengthby14%.Themeshfabriccouldincreasethestrengthofthepolyurethanecoating
substrate ,bringingacertainstrengtheningeffect.However,thebreakelongationcouldalsobedecreased.Asthe
elongationandstrengthofthemeshfabricdominatesthatofthecompositecoating ,inpracticalengineeringapplica
tions,themeshfabricshouldnotbeadoptedwhenmeetingthefollowingconditions:(a)thecoatingelongationre
quirementsarehigherthanthatofthemeshfabric ;(b)thesubstratematerialstrengthisgreaterthanthemeshfab
ric ;(c)thesubstratematerialstrengthisgreaterthanthecoating - substratetangentialbondingstrength(e.g.
3.2MPaforconcretesubstrate ).Atpresent, thephysicalandmechanicalpropertiesintheexistingpolyurea
relatedstandardsandspecificationsareproposedwithoutadoptingmeshfabric.Thematerialpropertiesproposedin
therelatedstandardsandspecificationscanalsomeetthecorrespondingconditionsfornotusingmeshfabricpro
posedinthisstudy.Thus ,meshfabricshouldnotbeusedwithpolyurea.
Keywords:meshfabric;polyurea;meshfabricreinforcedpolyureacoating;detailedmodel;tensiletest
(责任编辑:韩 昆)
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