Dab tsi yog compatibility ntawm polycarboxylic acid superplasticizer thiab pob zeb raw khoom?

Kev ua haujlwm ntawm pob zeb thiab lub zog ib txwm muaj feem cuam tshuam nrog dej-cement piv. Piv txwv li, kev npaj cov pob zeb muaj zog feem ntau yuav tsum muaj qhov sib piv ntawm cov dej-cement tsawg, tab sis qhov qis dej-cement piv txwv tsis pub txo cov dej ntws ntawm cov pob zeb, ua rau kev tsim kho nyuaj dua. Kev taw qhia ntawm cov dej-txo cov neeg ua haujlwm tau ua tiav qhov kev tsis sib haum xeeb ntawm kev ua haujlwm thiab lub zog los ntawm cov dej-cement piv, ua rau kev npaj cov pob zeb ua haujlwm zoo thiab muaj zog.

Vim nws cov txiaj ntsig zoo xws li kev siv tsawg tsawg, cov dej txo qis, zoo slump tuav, kho cov qauv molecular, thiab ib puag ncig tus phooj ywg, polycarboxylate superplasticizer tau nce ntxiv. Nws tau dhau los ua cov dej txo qis rau kev npaj cov pob zeb ua haujlwm siab zoo li cov pob zeb ua haujlwm siab, cov pob zeb ua kom nws tus kheej, thiab cov pob zeb muaj zog. Txawm li cas los xij, txawm tias muaj kev loj hlob ntawm daim ntawv thov ntawm polycarboxylate superplasticizer, cov teeb meem xws li kev txo qis dej tsis zoo thiab kev tawg, kev teeb tsa tsis zoo ntawm cov pob zeb, kev poob qis dhau sijhawm, thiab txawm tias cov pob zeb tsis muaj zog tau pom nyob rau hauv cov kev siv tswv yim. Ib qho ntawm cov laj thawj tseem ceeb yog qhov teeb meem kev sib raug zoo ntawm polycarboxylate superplasticizer thiab ntau yam khoom siv raw hauv pob zeb.

Raws li JC/T 1083-2008Test Methods rau Compatibility ntawm Cement thiab Dej Reducers, kev sib raug zoo ntawm cov cement thiab dej reducer yog suav tias yog qhov zoo yog tias qhov saturation point ntawm cov dej reducer yog qhov tseeb, qhov pib fluidity ntawm cov cement paste yog qhov zoo, qhov poob ntawm lub sij hawm me me, thiab tsis muaj qhov pom tseeb los ntshav lossis kev sib cais. Kev sib raug zoo ntawm polycarboxylate superplasticizer nrog cov ntaub ntawv sib txawv hauv cov pob zeb tuaj yeem tshwm sim hauv cov hauv qab no:

Cement

Thaum siv tib lub polycarboxylate superplasticizer nrog cov cements sib txawv, nws muaj peev xwm hais tias lub superplasticizer tuaj yeem ua tau zoo nrog ib qho cement tab sis tsis zoo sib xws nrog lwm tus. Ib yam li ntawd, thaum siv tib cov cement nrog cov polycarboxylate superplasticizers sib txawv, cov xwm txheej zoo sib xws yuav tshwm sim. Nyob rau saum npoo, cov teeb meem no tshwm sim los ntawm qhov sib txawv ntawm cov cement thiab polycarboxylate superplasticizer hom, tab sis lub hauv paus ua rau nyob rau hauv lawv lub cev thiab tshuaj. Tsis tas li ntawd, thaj chaw tshwj xeeb ntawm cov cement yog lwm qhov cuam tshuam rau nws cov kev sib raug zoo nrog polycarboxylate superplasticizer. Thaum qhov chaw tshwj xeeb ntawm cov cement nce, qhov chaw sib cuag ntawm cov cement hais thiab dej, nrog rau cov polycarboxylate superplasticizer molecules, nce, ua rau kom muaj zog saum npoo thiab cov cement hydration sai, yog li txhim kho adsorption thiab ua rau ntau dua. poob lub sij hawm, uas yuav ua rau tsis zoo compatibility.

Mineral Admixtures

Muaj cov khoom pov tseg xws li ya tshauv, slag, thiab silica fume feem ntau yog siv los ua cov khoom sib xyaw ua ke, tsis tsuas yog ua haujlwm rau ib puag ncig, tab sis kuj tseem yog cov ntaub ntawv tseem ceeb rau kev npaj cov pob zeb ua haujlwm zoo los ntawm kev pom. Lub compatibility ntawm ntxhia admixtures thiab polycarboxylate superplasticizer feem ntau yog vim adsorption nyhuv ntawm admixtures ntawm lub superplasticizer. Granulated blast furnace slag thiab high-zoo ya tshauv nrog cov ntsiab lus siab ntawm kheej kheej iav muaj tsawg adsorption ntawm polycarboxylate superplasticizer, li no qhia tau hais tias zoo compatibility nrog nws.

Cov ntsiab lus carbon hauv ya tshauv yog qhov tseem ceeb cuam tshuam rau nws qhov kev sib raug zoo nrog polycarboxylate superplasticizer. Fly tshauv nrog cov ntsiab lus carbon siab tuaj yeem nqus tau ntau ntawm superplasticizer thiab dej, ua rau tsis zoo sib xws. Silica fume, vim nws qhov chaw siab heev, tuaj yeem nqus tau ntau npaum li cas ntawm polycarboxylate superplasticizer, ua rau tsis zoo sib xws.

Lwm yam tshuaj lom neeg

Kev sib xyaw ua ke ntawm ntau yam khoom sib xyaw tuaj yeem tsim cov nyhuv superimposed, thiab txoj hauv kev no tau nce ntxiv hauv cov pob zeb ua haujlwm. Qee zaum, ib qho dej txo qis tsis tuaj yeem ua tau raws li kev tsim kho, yog li yuav tsum tau siv kev sib xyaw ntawm cov dej sib txawv. Lub adaptability ntawm polycarboxylate superplasticizer nrog rau lwm cov dej reducers txawv nyob ntawm seb hom ntawm lwm yam reducer. Nws ua haujlwm zoo nrog lignosulfonate-raws li dej reducers tab sis tuaj yeem muaj kev cuam tshuam tsis zoo thaum siv nrog naphthalene-raws li dej reducers. Tsis tas li ntawd, polycarboxylate superplasticizer tuaj yeem muaj teeb meem kev sib raug zoo nrog lwm cov khoom sib xyaw xws li cov tshuaj tiv thaiv thaum ntxov, retarders, thiab expansion agents. Cov ntsiab lus sulfate thiab alkali hauv cov khoom siv no, tshwj xeeb, tuaj yeem cuam tshuam rau lawv cov kev sib raug zoo nrog polycarboxylate superplasticizer.

Aggregates

Aggregates muaj kev cuam tshuam ncaj qha rau ntau yam khoom ntawm pob zeb, nrog rau cov av nkos yog ib qho ntawm cov cim tseem ceeb ntawm kev sib sau ua ke. Ua ntej qhov kev taw qhia ntawm polycarboxylate superplasticizer, qhov cuam tshuam ntawm cov av nkos hmoov hauv cov khoom sib xyaw ua ke ntawm kev ua vaj tse, tsuav yog nws nyob hauv cov qauv txwv, kuj yog me me thiab feem ntau tsis saib xyuas. Txawm li cas los xij, raws li kev siv cov polycarboxylate superplasticizer tau nce, thiab cov khoom siv zoo tshaj plaws hauv cov khoom siv tau dhau los ua tsis zoo, kev siv cov xuab zeb tsim nrog cov hmoov nplej siab thiab cov xuab zeb ntuj nrog cov av nkos ntau dua hauv cov qhob tau pom tias tsis zoo sib xws nrog polycarboxylate superplasticizer. Lub superplasticizer yog tshwj xeeb tshaj yog rhiab heev rau cov av nkos cov ntsiab lus nyob rau hauv aggregates, thiab cov av nkos cov ntsiab lus siab heev tuaj yeem cuam tshuam cov dej txo thiab dispersion kev ua tau zoo ntawm superplasticizer, thaum kawg cuam tshuam rau kev ua haujlwm thiab lub zog ntawm cov pob zeb.

Sulfate thiab Alkali Cov ntsiab lus

Sulfates nyob rau hauv pob zeb mas yog los ntawm cov cement clinker, admixtures, lwm yam tshuaj additives, thiab lwm gypsum siv los tswj qhov chaw ntawm cement. Cov kev tshawb fawb tau pom tias sulfates, ntawm ib sab, sib tw nrog polycarboxylate superplasticizer rau adsorption, txo cov nyiaj superplasticizer muaj rau disperse cement hais. Ntawm qhov tod tes, lub xub ntiag ntawm sulfates tuaj yeem txo qhov cuam tshuam steric hindrance ntawm superplasticizer, yog li cuam tshuam nws cov dej-txo thiab dispersing kev ua tau zoo.