Cov yam ntxwv & Cov txiaj ntsig ntawm hmoov polycarboxylate superplasticer pce

Lub polycarboxylate superplasticizer pce hmoov tej hmoov uas cov txheej txheem sib xyaw ua ke, siv cov thermal synthesis txoj kev. Qhov no tuaj yeem txo cov nqi ntau lawm hauv kev siv hluav taws xob. Nws tsis ntxiv cais cov neeg sawv cev, ua rau cov khoom lag luam siab dua, nrog cov ntsiab lus ruaj khov ntawm ib ncig ntawm 98%. Nyob rau hauv cov nqe lus ntawm cov khoom lag luam, cov khoom lag luam siab muaj cov yam ntxwv ntawm cov khoom siv tsawg, muaj kev ruaj khov ntawm cov khoom xyaw nquag, thiab kev ruaj khov zoo. Qhov no ntxiv txo tus nqi rau cov neeg siv khoom.

Lub polycarboxylate superplasticizer pce hmoov hmoov muaj kev tawg ua tau zoo heev thiab kua qaub rau cement ntawm cov tshuaj qis; Thaum cov tshuaj ntau tshaj 0.12% rau 0.22%, kev sib xws ntawm cov paste qhia tau nce ntxiv; Qhov ploj ntawm cov tshuaj txhuam tau sib xws nyob hauv ib teev tsawg dua li cov koob tshuaj nce ntxiv.

Cov txiaj ntsig ntawm cov dej txo tus tshuaj khib muaj kev sib raug zoo nrog cov txiaj ntsig ntawm cov ntshiab paste ntawm cov ntshiab paste. Ntawd yog, qhov ntau dua cov fluidity ntawm cov ntshiab muab tshuaj txhuam, ntau dua cov dej txo ntawm cov tshuaj cug. Raws li polycarboxylate superplasticizer pce cov hmoov noj nce, cov nyiaj txo qis nce nrawm, thiab nws yog qhov siab. Cov dej txo qis ntawm cov pob zeb ua nrog cov roj reducer feem ntau tsis sib xws nrog cov ntaub ntawv txo qis ntawm cov khoom siv admixture thiab cov pob zeb. Thaum cov khoom ntawm admixture cov ntaub ntawv thiab cov xuab zeb thiab gravel tau ua kom muaj txiaj ntsig, cov dej txo qis dua li ntawm lub cug vuaj, thiab hloov ua lwm yam.

Qhov kev pom zoo ntawm polycarboxylate superplasticizer pce hmoov hmoov dej reducer yog: 0.1% rau 0.3% ntawm txoj kev siv Maas. Lub hmoov hom polycarboxylate superplasticer pce dej reducer yog ib yam hmoov av, nrog cov ntsiab lus ntawm txog 98%. Qhov kev siv tshuaj ib txwm muaj 0.1% {- 0.3%, nws tuaj yeem ua tiav 12% lub zog nce ntxiv, uas yog qhov zoo dua li ntawm cov neeg ua kom tuag taus. Thaum cov tshuaj yog 0.1%, nws txoj kev ua tau zoo tshaj qhov uas muaj naphthalene-raws li thiab melamine-raws li cov dej ntws zoo. Txawm li cas los xij, thaum ntau npaum li cas ntawm polycarboxylate superplasticizer yog qis dua 0.14%, kev ua haujlwm zoo ntawm kev ua haujlwm tsis pom tseeb. Thaum cov koob tshuaj mus txog 0.20% lossis siab dua, qhov ua haujlwm thiab nqus dej ntawm cov pob zeb ua tau zoo dua los txhim kho. Thaum teeb tsa high-concentration ya tshauv ya / slag micro-hmoov pob zeb ua thiab pob zeb ua kom tau tshwj xeeb, cov tshuaj yuav nce ntxiv rau 0.3%.

Thaum lub sij hawm cov txheej txheem ntau lawm, peb cov khoom siv ua kom zoo nkauj (calmium sulfate caas key) feem ntau ua rau qee cov ntaub ntawv tsis muaj teeb meem thaum siv cov teeb meem dej sib txawv. Feem ntau, cov dej piv tau siv nyob rau hauv cov khoom kawg tau tshaj li cov dej uas yuav tsum muaj rau cov kev haus dej ntawm cov khoom siv xis. Cov dej ntxiv yog rau kev hloov kho kom zoo nkauj (muaj zog) ntawm lub system. Txo dej tsis txhais tau tias poob fluidity; Hloov chaw, nws yuav txhim kho qhov kev ua tau zoo ntawm kev ua tau zoo. Yog li, cov txiaj ntsig ntawm polycarboxylate superplasticer pce hmoov uas tau coj los txo cov dej siv? Thov nyeem rau.

Early strength, as is well known, the water in the material gradually evaporates over time under the influence of factors such as temperature and wind force until it disappears. Thaum cov dej uas siv los ua kom muaj kev co kom ntseeg tau, cov dej tsawg dua, thiab cov khoom tsawg dua uas yuav tsum tau ua kom muaj zog, thiab cov khoom siv tsawg yuav zoo dua. Kawg zog, zoo sib xws rau cov dej saum toj no, cov khoom tsawg dua hauv cov khoom siv zaum kawg los ntawm polycarboxylate superplasticizer pce hmoov.

Thaum lub sij hawm cov txheej txheem kiv cua tshuab ntawm cov khoom noj qabentitious, tus kheej cohesive Caasation tsim los ntawm cov ntaub ntawv yuav muaj qhov sib piv tseem ceeb, uas yog qhov hnyav dua. Hauv cov ntsiab lus, ib qho me me dej piv muab qhov chaw tsawg rau shrinkage, uas yog ib kis. Lwm lub ntsiab lus yog tias hloov polycarboxylate superplasticizer pce monomer yog cov khoom siv siab. Nyob rau lub sijhawm dhau los, nws muaj lwm lub npe, hu ua polycarboxylate superplasticer. Tom qab cov dej evaporation tiav, cov lus nug tshwm sim: Yuav ua li cas hais txog Polycarboxylic Monomer? Qhov tseeb, raws li cov khoom siv high-molecular, nws twb tau muab cov yas thiab sau rau hauv thaj chaw uas yuav ua rau shrinkage, muaj qee yam cuam tshuam ntawm kev txo cov shrinkage. Qhov no yog point ob.

Lub hauv paus ntsiab lus ntawm kev txo qis los ntawm hloov polycarboxylate superplasticizer pce, tiv thaiv cov molecule hydrees los ntawm kev sib txuas nrog dej. Hauv cov ntsiab lus yooj yim, ib qho teeb meem yog tsim los ntawm cov khoom qab zib cov khoom qab zib thiab dej, yog li cov tshuaj pleev ib ce yuav ua raws li cov nyhuv thawb, uas yog ib txwm hu ua fluidity. Uas yog hais, lub polycarboxylic ntsev / polycarboxylate superplasticizer pce hmoov zoo nyob rau hauv kev txo cov dej ntws. Rau cov ntaub ntawv uas tsis tas yuav muaj fellity (anti-splashing, thiab lwm yam), siab-vaculose cellulose thiab cov hmoov txhuv nplej siab tuaj yeem siv rau kev hloov kho.

Vim tias polycarboxylic ntsev / polycarboxylate superplasticizer pce hmoov dej reducer yog cov khoom siv ntau, nws cov tshuaj muaj tsawg heev. Qhov kev pom zoo muab tshuaj feem ntau yog 0.1%- 0.5}% ntawm cov khoom siv xis. Yog li ntawd, nrog rau cov tshuaj tsawg, tib neeg yuav muaj kev ua xyem xyav txog cov neeg tsis txaus siab txog cov ntsev (lub sijhawm rau kev siv dej) thaum siv nws. Cov khoom muaj kuab heev ntawm cov khoom siv polycarboxylic yuav tsum muaj peev xwm tshem tawm sai sai, dispersing nrawm nrawm nrawm mus rau txhua lub ces kaum ntawm cov khoom, thiab tom qab ntawd adsorbing. Qhov xaus lus no yog tias nws ua rau lub sijhawm sib xyaw ua ke thaum kev tsim kho. Tom qab lub sijhawm ntev ntawm kev txheeb xyuas qhov tseeb, hloov kho cov roj polycarboxylate loj heev ntawm cov tshuaj tsw qab rau lwm cov dej reducers. Nyob rau tib lub sijhawm, nws muaj qhov tsis sib thooj hauv kev sib xyaw nrog lwm cov kev sib ntxiv, nrog yuav luag xoom epo emissions, ua rau nws sawv tawm hauv cov ntaub ntawv nrog cov khoom muaj kev tiv thaiv ntau dua.

Cov ntaub ntawv yuav tsum tau ua tiav rau txhua cov khoom lag luam tiav tiav lawm, yog li Polycarboxylic / polycarboxylate superplasticer ntsev tau muab faib ua ntau yam qauv. Piv txwv li, hais txog kev ua tau zoo: