Polycarboxylate Superplasticizer Hmoov Mortar Additives

Nyob rau hauv kev lag luam tshwj xeeb mortar, hmoov polycarboxylate superplasticizer dej reducer yog nce ntxiv, xws li tus kheej-leveling cement, gypsum self-leveling, kho mortar, grouting khoom, txhawb mortar, grouting khoom, UHPC high-performance pob zeb, thiab lwm yam Polycarboxylate Superplasticizer hmoov Kev ua haujlwm siab dej reducer tuaj yeem txhim kho cov kua dej ntawm cov tshuaj khib thiab ua kom lub zog thaum ntxov thiab lig ntawm cov khoom siv tshuaj khib.

Hauv cov txheej txheem tsim khoom txhua hnub, peb siv peb cov khoom siv cementitious feem ntau (calcium sulfate cementing cov ntaub ntawv, silicate cement, calcium aluminate cement). Hauv cov txheej txheem ntawm kev siv cov ntaub ntawv no, feem ntau muaj qee qhov kev nkag siab tsis zoo, uas yog, qhov teeb meem ntawm dej piv. Feem ntau, qhov sib piv ntawm cov dej siv hauv peb cov ntaub ntawv tiav yog qhov tseeb ntau dua li cov dej xav tau rau cov dej ntawm cov ntaub ntawv cementitious. Cov dej ntxiv yog los kho cov haujlwm ua haujlwm (constructibility) ntawm qhov system. Kev txo dej tsis yog txhais tau tias poob ntawm kev ua haujlwm, tab sis tuaj yeem txhim kho qhov kev ua tau zoo. Yog li dab tsi yog qhov txiaj ntsig ntawm kev txo cov dej?

Lub zog thaum ntxov (thaum ntxov lub zog), raws li peb txhua tus paub, cov dej hauv cov khoom maj mam evaporates kom txog thaum nws ploj mus tom qab cov khoom siv cementitious solidifies nrog lub sijhawm dhau los, nyob rau hauv cov yam ntxwv xws li kub thiab cua, yog li cov dej me me. ratio yog, cov dej tsawg yuav tsum tau evaporated, thiab qhov zoo dua lub zog thaum ntxov ntawm cov khoom yuav. Lub zog kawg (lub zog kawg), zoo ib yam li cov saum toj no, cov dej tsawg dua siv rau hauv cov khoom siv, qhov sib piv ntawm cov khoom siv ntau dua, cov voids tsawg dua, thiab qhov kawg lub zog yuav raug txhim kho.

Lub nruj gelation ntawm cementitious cov ntaub ntawv tsim nyob rau hauv cov txheej txheem hydration tas mus li yuav tsim ib tug loj shrinkage nyhuv, tshwj xeeb tshaj yog nyob rau hauv cov ntaub ntawv ntawm ib tug loj water ratio. Nyob rau hauv cov ntsiab lus, qhov shrinkage qhov chaw muab los ntawm ib tug me me dej ratio yog tsawg tshaj li ntawm ib tug loj water ratio, uas yog ib tug ntawm lawv. Tsis tas li ntawd, hloov kho polycarboxylic acid monomer yog cov khoom siv polymer. Yav dhau los, nws muaj lwm lub npe, hu ua plasticizer. Tom qab cov dej evaporates, lo lus nug yog, dab tsi txog polycarboxylic acid monomer? Qhov tseeb, raws li cov khoom siv polymer, nws tau ua cov yas thiab ntim rau hauv txhua qhov sib txawv uas tuaj yeem txo qis. Nws muaj qee yam cuam tshuam ntawm kev txo qis qis. Qhov no yog qhov thib ob.

Lub hauv paus ntsiab lus txo dej ntawm kev hloov pauv Polycarboxylate Superplasticizer Powder yog cov polymer qhwv cov hydrate molecules kom cov hydrate tsis ua ke nrog dej. Nyob rau hauv cov nqe lus ntawm layman, nws yog tsim ib tug barrier ntawm cov khoom gelling thiab dej. Qhov tshwm sim yog tias cov khoom siv gelling yuav ua raws li cov dej ntws thiab tsim kev thawb, uas yog qhov peb feem ntau hu ua fluidity. Qhov ntawd yog hais tias, polycarboxylate tuaj yeem muab kev ua haujlwm zoo ntawm kev tsim kho kev ua haujlwm thaum txo cov dej sib piv. Rau cov khoom tiav uas tsis tas yuav tsum muaj fluidity (anti-sagging, thiab lwm yam), nws tuaj yeem hloov kho los ntawm high-viscosity cellulose thiab starch ether.

Vim tias polycarboxylate dej reducer yog polymer, qhov ntau npaum li cas tsawg heev. Feem ntau pom zoo noj yog 0.1%-0.5% ntawm cov khoom siv cementitious. Ntawm qhov me me npaum li cas, tib neeg yuav muaj kev tsis ntseeg txog dej dispersibility ntawm polycarboxylates (ib lub sij hawm stirring thaum ntsib dej thaum lub sij hawm tsim kho). Cov khoom ntawm cov khoom lag luam polycarboxylate uas paub tab yuav tsum muaj peev xwm yaj sai sai, sai sai tawg mus rau txhua lub ces kaum ntawm cov khoom los ntawm electrostatic repulsion thiab steric hindrance, thiab ces sai sai adsorb, yog li ntawd lub sij hawm stirring thaum lub sij hawm tsim kho yog heev luv luv.

Tom qab lub sijhawm ntev ntawm kev rov ua qauv qhia, qhov hloov kho polycarboxylate superplasticizer dej reducer muaj qhov cuam tshuam me me ntawm cov dej ntawm cov ntaub ntawv cementitious piv nrog rau lwm cov dej reducers. Nws kuj muaj qhov zoo sib xws hauv kev sib raug zoo nrog lwm cov additives. Qhov yuav luag xoom AEPO emission ua rau nws sawv tawm hauv cov ntaub ntawv nrog rau ib puag ncig siab.

Cov kev ua tau zoo ntawm txhua cov khoom tiav yog txawv, yog li polycarboxylate tiav cov dej reducers kuj tau muab faib ua ntau yam qauv, xws li kev ua haujlwm: tsom rau cov dej ntws, tuav, dej txo qis dua, kev ua tau zoo plasticization, kev ua tau zoo, thiab lwm yam.

Yog li ntawd, thaum muas polycarboxylate superplasticizer dej reducer, sim nrhiav cov kws tshaj lij thiab cov neeg muag khoom, thiab qhia rau lawv cov neeg ua haujlwm muag khoom ntawm kev ua haujlwm ntawm lawv tus kheej cov ntaub ntawv, kom sai nrhiav cov khoom sib xws thiab tsis txhob hla.

Ntxiv rau kev siv cov tshuaj khib nyiab tshwj xeeb, cov hmoov av polycarboxylate dej reducers tau txuas ntxiv mus rau cov khoom sib xyaw qhuav qhuav, rwb thaiv tsev boards, prefabricated Cheebtsam, EPS kab, sab hauv thiab sab nrauv phab ntsa xov, gypsum-raws li cov ntaub ntawv, pobzeb adhesives, hluav taws xob porcelain. thiab lwm yam teb. Ntau thiab ntau kev lag luam siv cov hmoov polycarboxylate dej reducers, uas ua pov thawj lub luag haujlwm tseem ceeb ntawm cov hmoov polycarboxylate dej reducers hauv cov ntaub ntawv mortar.

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