Dab tsi yog Superplasticizer Admixture?

Pob zeb yog cov khoom siv dav siv hauv kev tsim kho vim nws cov kav ntev, tsis muaj hluav taws xob, muaj peev xwm tiv taus qhov kub thiab txias, thiab muaj peev xwm ua tau ntau yam hauv ntau yam duab. Txawm li cas los xij, txhawm rau txhim kho nws cov khoom siv kho tshuab thiab ua haujlwm tau zoo, cov khoom siv feem ntau ntxiv rau cov pob zeb sib xyaw.

Kev sib xyaw ua keyog cov khoom sib xyaw ua ke rau hauv kev sib xyaw ua ke ua ntej kev sib tov. Cov admixtures hloov kho cov khoom ntawm pob zeb, ua rau nws tsim nyog rau kev siv tshwj xeeb thaum tseem txo cov nqi thiab kev cuam tshuam ib puag ncig. Kev siv cov khoom sib xyaw tuaj yeem txo cov nqi tsim kho, txhim khu kev ruaj ntseg ntawm cov pob zeb, tiv thaiv dej to, thiab txhim kho tag nrho lub zog.

Hom Concrete Admixtures

Admixtures raug cais raws li lawv txoj haujlwm. Ntau hom kev sib xyaw muaj xws li dej-txo, slump retaining, waterproofing, accelerating, thiab lwm yam. Ib qho tshwj xeeb zoo admixture yog covsuperplasticizer.

Dab tsi yog Superplasticizer Admixture?

Hauv kev sib xyaw ua ke, dej yog qhov tseem ceeb rau kev txhim kho kev ua haujlwm thiab ntws. Txawm li cas los xij, dej ntau dhau tuaj yeem ua rau cov pob zeb tsis muaj zog, ua rau nws yooj yim dua rau cov kab nrib pleb thiab shrinkage. Txhawm rau tsim kom muaj zog thiab ruaj khov pob zeb ntau dua thaum txo qis cov ntsiab lus dej, aplasticizer admixtureyog ua hauj lwm. Plasticizers, los yog dej-txo admixtures, txo cov dej ntsiab lus hauv pob zeb los ntawm 5 mus rau 10%.

Superplasticizer admixtures, tseem hu ua high-range water reducers, yog cov plasticizers siab heev uas tuaj yeem txo cov ntsiab lus dej los ntawm 12% mus rau ntau dua 30%. Cov admixtures no hloov cov pob zeb qis thiab tawv tawv rau hauv cov khoom siv dej ntau dua thiab ua haujlwm tau zoo, txhim kho nws lub zog thiab txo qis.

Hom Superplasticizers

Superplasticizers tau muab faib ua plaub pawg loj:

Tom ntej: Sulfonated Melamine Formaldehyde Condensate (SMF)

Sulfonated Naphthalene Formaldehyde Condensate (SNF)

Hloov kho Lignosulphonate (MLS)

Lwm tus:Xws li sulfonic acid ester, polyacrylates, polystyrene sulphonates, thiab lwm yam.

Mechanism ntawm Superplasticizers

Superplasticizers muaj cov dej-soluble polymer molecules. Thaum ntxiv rau pob zeb, cov molecules adsorb rau saum npoo ntawm cov cement nplej, tsim ib pawg ionic. Cov txheej txheem no imparts ib tug tsis zoo nqi rau cov cement hais, ua rau kev sib nrig sib repulsion thiab steric hindrance, uas tiv thaiv cov hais los ntawm clumping ua ke.

Piv rau cov txheej txheem plasticizers, superplasticizers yog siv ntau dua, feem ntau yog li ntawm 1 txog 3 litres ib cubic meter ntawm pob zeb. Cov kua superplasticizers yuav tsum muaj txog 40% cov khoom siv kom ua tau zoo.

Qhov zoo ntawm kev siv Superplasticizer Admixtures

Superplasticizers muaj ntau yam txiaj ntsig tseem ceeb:

Ua haujlwm tau zoo:Lawv tsim cov dej ntws, tus kheej-leveling pob zeb yam tsis xav tau dej ntxiv.

Ua kom muaj zog:Lawv txhim kho lub zog ntawm pob zeb tsis muaj cov ntsiab lus ntawm cov cement.

Txhim kho Bond Strength:Lawv txhim kho qhov adhesion thiab kev sib raug zoo rau qhov chaw.

High Concrete Density:Lawv pab ua kom tiav cov pob zeb ua haujlwm siab, tiv thaiv cov kab nrib pleb thiab txhim kho cov kav ntev.

Hauv cov ntsiab lus,superplasticizersyog qhov tseem ceeb hauv cov cuab yeej ua vaj tsev niaj hnub no, muab kev ua haujlwm zoo tshaj plaws, lub zog, thiab kav ntev. Los ntawm kev txo cov dej cov ntsiab lus thiab txhim kho tag nrho cov pob zeb zoo, superplasticizers pab txhawb kom muaj txiaj ntsig zoo dua, siv tau zoo, thiab siv tau ntev.