EPS granular thermal rwb thaiv tsev mortar yog ib lub teeb yuag thermal rwb thaiv tsev cov ntaub ntawv sib xyaw nrog cov khoom siv tsis zoo, cov organic binders, admixtures, additives thiab lub teeb aggregates nyob rau hauv ib qho kev faib ua feem. Ntawm EPS granular thermal rwb thaiv tsev mortars tam sim no tshawb fawb thiab siv, nws tuaj yeem rov ua dua Dispersed latex hmoov muaj kev cuam tshuam zoo rau kev ua haujlwm ntawm mortar thiab occupies ib qho kev faib ua feem ntawm tus nqi, yog li nws tau ua kom pom tseeb ntawm tib neeg kev mloog. Kev sib koom ua ke ntawm EPS particle rwb thaiv tsev mortar sab nrauv phab ntsa rwb thaiv tsev feem ntau yog los ntawm cov polymer binder, thiab nws cov muaj pes tsawg leeg feem ntau yog vinyl acetate / ethylene copolymer. Redispersible latex hmoov tuaj yeem tau los ntawm cov tshuaj tsuag kom qhuav no hom polymer emulsion . Vim qhov kev npaj meej, kev thauj mus los yooj yim thiab khaws cia yooj yim ntawm redispersible latex hmoov hauv kev tsim kho, tshwj xeeb xoob latex hmoov tau dhau los ua ib qho kev txhim kho vim nws qhov kev npaj meej, kev thauj mus los yooj yim thiab khaws cia yooj yim. Qhov kev ua tau zoo ntawm EPS particle rwb thaiv tsev mortar yog nyob ntawm ntau yam ntawm cov khoom siv thiab cov khoom siv polymer. Ethylene-vinyl acetate latex hmoov (EVA) nrog cov ntsiab lus ethylene siab thiab qis Tg (iav hloov kub) tus nqi muaj kev ua tau zoo dua ntawm kev cuam tshuam lub zog, daim ntawv cog lus lub zog thiab dej tsis kam.
Kev ua kom zoo ntawm cov hmoov latex ntawm kev ua haujlwm ntawm mortar yog vim lub fact tias latex hmoov yog ib tug siab molecular polymer nrog polar pawg. Thaum cov hmoov latex tov nrog EPS hais, qhov tsis yog-polar ntu nyob rau hauv cov saw tseem ceeb ntawm latex hmoov polymer yuav lub cev adsorption yuav tshwm sim nrog cov tsis-polar nto ntawm EPS. Cov pawg polar nyob rau hauv cov polymer yog taw qhia sab nraud ntawm EPS hais, kom cov EPS hais hloov ntawm hydrophobicity mus rau hydrophilicity. Vim yog kev hloov kho ntawm EPS cov khoom los ntawm cov hmoov latex, nws daws qhov teeb meem uas EPS cov khoom tau yooj yim raug dej. Floating, qhov teeb meem ntawm loj txheej ntawm mortar. Nyob rau lub sijhawm no, thaum cov cement ntxiv thiab sib xyaw, cov pawg polar adsorbed rau ntawm qhov chaw ntawm EPS cov khoom sib cuam tshuam nrog cov cement hais thiab sib xyaw ua ke, kom cov haujlwm ntawm EPS rwb thaiv tsev mortar yog qhov zoo tuaj. Qhov no tau tshwm sim nyob rau hauv qhov tseeb tias EPS hais tau yooj yim wetted los ntawm cov cement paste, thiab lub zog sib txuas ntawm ob qho tib si tau txhim kho zoo heev.
Emulsion thiab redispersible latex hmoov tuaj yeem tsim lub zog tensile siab thiab kev sib txuas ntawm cov ntaub ntawv sib txawv tom qab tsim cov yeeb yaj kiab, lawv tau siv los ua tus thib ob binder hauv mortar los ua ke nrog inorganic binder cement, cement thiab polymer raws li muab kev ua si tag nrho rau cov kev sib raug zoo los txhim kho lub kev ua haujlwm ntawm mortar. Los ntawm kev soj ntsuam lub microstructure ntawm cov khoom siv polymer-cement composite, nws ntseeg tau tias qhov sib ntxiv ntawm cov kua roj hmab redispersible latex tuaj yeem ua rau cov ntaub ntawv polymer ua ib zaj duab xis thiab ua ib feem ntawm lub qhov phab ntsa, thiab ua rau cov mortar tag nrho los ntawm lub zog sab hauv, uas txhim kho lub zog sab hauv ntawm lub mortar. Polymer lub zog, yog li txhim kho qhov tsis ua hauj lwm kev nyuaj siab ntawm lub mortar thiab ua rau qhov kawg strain. Txhawm rau kawm txog kev ua haujlwm ntev ntawm redispersible latex hmoov nyob rau hauv mortar, nws tau pom los ntawm SEM tias tom qab 10 xyoo, lub microstructure ntawm polymer nyob rau hauv mortar tsis tau hloov, tuav ruaj khov, flexural thiab compressive zog thiab zoo dej repellency. Kev tsim cov txheej txheem ntawm cov pobzeb nplaum lub zog tau kawm nyob rau ntawm cov hmoov av redispersible latex, thiab nws tau pom tias tom qab cov polymer tau qhuav rau hauv zaj duab xis, cov yeeb yaj kiab polymer tsim ib qho kev sib txuas ntawm cov mortar thiab cov nplais ntawm ib sab, thiab ntawm Nyob rau hauv tas li ntawd, lub polymer nyob rau hauv lub mortar tsub kom cov huab cua cov ntsiab lus ntawm lub mortar thiab cuam tshuam lub tsim thiab wettability ntawm lub nto, thiab tom qab ntawd thaum lub sij hawm txheej txheem, lub polymer kuj muaj ib tug zoo ntxim rau lub hydration txheej txheem thiab shrinkage ntawm cov cement nyob rau hauv cov txheej txheem. binder, Tag nrho cov no yuav pab txhim kho kev sib raug zoo.
Ntxiv cov roj respersible latex hmoov rau hauv mortar tuaj yeem txhim kho kev sib raug zoo nrog lwm cov ntaub ntawv, vim tias hydrophilic latex hmoov thiab cov kua theem ntawm cov cement suspension nkag mus rau hauv cov pores thiab capillaries ntawm matrix, thiab cov hmoov latex nkag mus rau hauv cov pores thiab capillaries. . Cov zaj duab xis sab hauv yog tsim thiab khov kho adsorbed rau ntawm qhov chaw ntawm lub substrate, yog li ua kom muaj kev sib raug zoo ntawm cov khoom siv cementitious thiab substrate.
Post lub sij hawm: Feb-17-2023