Tus nqi Superplasticizer yog dab tsi?

Polycarboxylate high-performance dej-txo admixtures yog lub ntiaj teb no siab tshaj plaws, technologically sophisticated, thiab cog lus superplasticizers nrog kev pom kev ua tau zoo. Cov khoom sib xyaw no yog copolymer grafted nrog carboxylic acids thiab lwm yam kev pabcuam zoo. Thaum xav txog covsuperplasticizer nqi, nws yog ib qho tseem ceeb kom paub txog tias cov khoom no, piv nrog cov khoom zoo sib xws hauv tsev thiab thoob ntiaj teb, tau mus txog qib siab thoob ntiaj teb hauv ob qho kev ntsuas kev ua tau zoo thiab kev ua haujlwm zoo.

Cov yam ntxwv ua haujlwm:

Tsawg npaum li cas thiab cov dej txo qis, uas tuaj yeem ncav cuag li 45%, cuam tshuam loj heevsuperplasticizer nqivim qhov txo qis uas yuav tsum tau muaj rau txhua daim ntawv thov.

Kev poob qis me me nrog cov pob zeb ua ntej sib xyaw: tsawg dua 5% hauv 1 teev thiab tsawg dua 10% hauv 2 teev;

Cov txiaj ntsig tseem ceeb ntawm kev txhim kho: pob zeb ntawm 3- hnub compressive zog nce los ntawm 50-110%, 28- hnub zog los ntawm 40-80%, thiab 90- hnub lub zog los ntawm {{5} }%;

Kev ua haujlwm tau zoo ntawm cov pob zeb, tsis muaj kev sib cais lossis los ntshav, thiab cov tsos zoo ib yam. Thaum siv los npaj cov pob zeb qib siab, cov pob zeb muaj cohesiveness zoo thiab yooj yim sib tov;

Cov ntsiab lus cua nruab nrab, tsis muaj kev cuam tshuam rau cov pob zeb ua qauv ntawm elasticity, thiab zoo khov-thaw durability;

tuaj yeem txo cov dej kub thaum ntxov ntawm cov cement, muaj txiaj ntsig zoo rau cov pob zeb loj thiab kev tsim kho lub caij ntuj sov; tussuperplasticizer nqiqhia txog nws tus nqi hauv cov xwm txheej zoo li no.

Kev hloov tau zoo heev, kev sib raug zoo nrog cov cement thiab cov khoom sib xyaw, hloov tau rau ntau qhov kub thiab txias, thiab daws qhov teeb meem tsis zoo nrog lwm cov dej-txo cov neeg ua hauj lwm;

Tsawg shrinkage, tuaj yeem txo qis qis qis, khov-thaw tsis kam, thiab carbonation kuj zoo dua li cov pob zeb zoo tib yam; notably txhim kho pob zeb ntim stability thiab lub sij hawm ntev durability;

Cov ntsiab lus alkali tsawg heev, Tsawg dua lossis sib npaug rau 0.2%, tiv thaiv cov tshuaj tiv thaiv alkali-tag nrho;

Cov khoom lag luam zoo ruaj khov, tsis muaj txheej txheej lossis sedimentation thaum lub sijhawm khaws cia ntev, thiab tsis muaj crystallization ntawm qhov kub thiab txias;

Eco-friendly khoom, tsis muaj formaldehyde;

Cov txiaj ntsig kev lag luam, txo nqi tag nrho cov nqi piv rau kev siv lwm hom khoom, txuag 15-25% ntawm cov cement nyob rau tib lub zog, ua rausuperplasticizer nqiyog ib qho tseem ceeb hauv kev txiav txim siab txog kev them taus ntawm qhov project.

Mechanism ntawm Action:

Dispersion nyhuv:Tom qab sib tov cov cement nrog dej, cov molecular attraction ntawm cov cement particles tsim cov qauv flocculent, ntxiab 10-30% ntawm cov dej sib tov thiab cuam tshuam nws cov dej ntws dawb thiab lubrication, cuam tshuam cov fluidity ntawm cov pob zeb sib tov. Thaum cov dej-txo cov tshuaj ntxiv ntxiv, lawv adsorb rau ntawm cov cement particle qhov chaw, muab cov nqi tib yam (feem ntau tsis zoo), tsim electrostatic repulsion thiab dispersing cov khoom, rhuav cov qauv flocculent thiab tso cov dej daig kom txhim khu lub fluidity ntawm cov pob zeb sib tov. .

Lubricating nyhuv:Cov pawg hydrophilic nyob rau hauv cov dej-txo admixtures yog heev polar, tsim ib tug ruaj khov solvated dej zaj duab xis nyob rau saum npoo ntawm cov cement hais, muab lubrication zoo heev thiab txo cov zawv zawg tsis kam ntawm cov cement hais, ntxiv txhim khu lub fluidity ntawm cov pob zeb.

Cov nyhuv Steric Hindrance:Lub hydrophilic polyether sab chains nyob rau hauv cov dej-txo admixture txuas mus rau hauv cov kev daws teeb meem, tsim ib tug hydrophilic peb-dimensional adsorption txheej ntawm cov adsorbed cement particle nto. Thaum cov cement particles mus txog, cov txheej txheem adsorption sib tshooj, tsim kom muaj kev cuam tshuam tsis zoo. Qhov ntau lawv sib tshooj, qhov ntau dua lub zog quab yuam, cuam tshuam kev sib sau ntawm cov cement hais thiab tswj kom zoo slump hauv cov pob zeb.

Graft Copolymer ceg Slow Release Effect:Nyob rau hauv cov txheej txheem ntawm cov dej-txo cov admixtures tshiab xws li polycarboxylate, ceg yog grafted mus rau lub molecules, muab steric hindrance thiab maj mam cleaved nyob rau hauv lub siab alkalinity ib puag ncig ntawm cement hydration, tso polycarboxylic acids uas txhim kho cov dispersion ntawm cement hais thiab tswj slump poob. .

Zuag qhia tag nrho, lubsuperplasticizer nqiyog tsim nyog los ntawm ntau yam ntawm cov txiaj ntsig cov khoom siv no coj mus rau kev tsim kho niaj hnub no, optimizing ob qho tib si lub cev ntawm cov pob zeb thiab kev lag luam ntawm kev tsim kho cov haujlwm.