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HEA膨胀剂的作用机理及在混凝土中的应用.docx

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HEA膨胀剂的作用机理及在混凝土中的应用 Introduction Tomakeconcretemixingeasier,additiveslikeHEAexpandingagent(heatexpansionagent)areaddedtothemixtoimprovesomepropertiesofconcretelikeworkability,expansion,orcompressivestrength.Ingeneral,HEAisduringthemixingprocesstoreduceconcrete'swatercontentandthereforeincreaseitscompressivestrength. Inthispaper,wewillexploreindetailthemechanisminvolvedintheactionofHEAasanexpandingagentinconcreteandtheapplicationofthiswastematerialinconcreteproduction. HEAExpandingAgent'sMechanismofAction HEAisatypeofheatexpansionagentthatcontainsAluminumPowderasaprimaryrawmaterial.Itincreasesthevolumeofconcretebyproducingthegasduringthemixingprocess.Itallowstheusertocontrolthevolumeoftheconcretewhenneeded.Morespecifically,theHEAexpandingagentworksbytheMaillardreaction.ThisprocessisachemicalreactionthatinvolvesthedecompositionoftheHEAduringthemixingprocess,whichreleaseshydrogengasintotheconcretemix,leadingtotheshrinkageoftheconcrete. Also,gaspressureincreasesovertimetoincreasethevolumeandpressureoftheconcretemix.Thereactionisaffectedbytemperatureandwaterintheconcretemix.Duringthemixingprocess,anexothermicreactiontakesplacewhichresultsinthereleaseofheat.Theheatproducedacceleratesthereactionandreleasesgasintotheconcretemix. HEAinConcreteProduction HEAiswidelyusedasanexpandingagentintheconcreteindustryforitseffectivenessinconcreteproduction.Generally,theamountoftheHEAisabout0.1%-0.5%oftheConcrete'sweighttoproducethedesiredeffect. 1)Inconcreteproduction,HEAisusedtoimprovecertainpropertiesofthefinalproduct,suchasworkabilityorexpanding. 2)Whenincludedinconcretemixtures,HEAdevelopssomeadvantagesasitiswater-reducing;itincreasescompressivestrengthofconcreteandresistsshrinkage. 3)Itmakestheconcretemixeasiertopourorspreadandimprovestheconcrete'sdurability,makingitlesslikelytocrackorfailovertime,thusprolongingitslife. 4)Itstrengthenstheconcretemix,makingitmoreresistanttoweatherandotherenvironmentalfactorsthatcancausedamage. HEAisusedindifferenttypesofstructureslikebuildings,bri