Dab tsi yog Plasticizer rau pob zeb?

A yas yasyog ib yam khoom lossis cov khoom siv ntxiv rau hauv pob zeb ua kom nws softer, txhim kho kev ua haujlwm thiab lub zog, thiab txo cov dej xav tau. Cov additives no yog qhov tseem ceeb hauv kev tsim kho niaj hnub, txhim kho qhov zoo thiab kev ua tau zoo ntawm cov pob zeb sib tov.

Plasticisers muaj nyob rau hauv ob hom:mineral additivesthiabtshuaj lom neeg additives, suav nrog superplasticisers.

Lub hom phiaj thiab cov txiaj ntsig ntawm Plasticisers

Lub hom phiaj tseem ceeb ntawm kev siv plasticisers yog los txhim kho qhov zoo ntawm cov cement sib tov, ua kom nws tsim nyog rau ntau yam kev siv. Lawv pab raws li hauv qab no:

Txo qhov dej-rau-cement pivtsis cuam tshuam kev ua haujlwm.

Tiv thaiv kom txhob shrinkage thiab tawghauv pob zeb.

Nce lub sij hawm teem, tso cai rau cov neeg ua haujlwm thauj cov pob zeb hla kev deb.

Hom Plasticizers

Mineral Admixtures / Plasticisers

Mineral admixtures yog cov khoom ntxiv rau cov pob zeb sib xyaw kom txhim kho lawv cov khoom. Cov no tau muab faib ua ob hom loj:

Cementitious Admixtures:Cov khoom pov thawj cementing thiab suav nrog cov ntaub ntawv xws li av granulated blast furnace slag. Lawv pab txhawb lub zog thiab durability ntawm cov pob zeb.

Pozzolanic Admixtures:Thaum sib xyaw nrog calcium hydroxide, cov khoom siv no nthuav tawm cov khoom cementitious. Piv txwv xws li ya tshauv, metakaolin, thiab silica fume. Lawv feem ntau ntxiv rau Portland cement sib tov los txhim kho lub zog mus ntev thiab txo tus nqi ntawm pob zeb.

Chemical Admixtures

Lub hom phiaj ntawm chemical admixtures yog los hloov cov khoom ntawm pob zeb hauv kev tshwj xeeb. Zoo li ntxhia admixtures, chemical admixtures tuaj nyob rau hauv ntau hom. Feem ntau hom yog dej-txo cov khoom sib xyaw, tseem hu ua plasticisers.

Cov yam ntxwv tseem ceeb ntawm cov khoom siv tshuaj lom neeg:

Dej txo:Cov khoom sib xyaw no pab kom muaj zog ntau dua los ntawm kev txo cov dej-cement piv thaum tswj kev ua haujlwm zoo ib yam. Qhov no ua tiav los ntawm kev txo qis cov ntsiab lus ntawm cov cement, uas pab txo cov cua sov ntawm hydration hauv cov pob zeb loj.

Ntau Yam Kev Txo Dej:Lawv tuaj yeem txo cov ntsiab lus dej ntau dua 5% tab sis tsawg dua 12%.

Piv txwv:Chemical admixtures muaj xws li retarders, dej reducers, accelerators, thiab air-entraining agents.

Superplasticizers

Kuj tseem hu ua high-range water reducers, superplasticisers yog ib qho ntawm cov khoom siv tshuaj lom neeg tsis ntev los no. Lawv muab ntau yam txiaj ntsig:

Nce Fluidity:Lawv muab ntxiv fluidity, tso cai rau ntws, self-compacting pob zeb.

Enhanced Penetration thiab Self-Leveling:Cov cuab yeej no yog qhov tseem ceeb rau cov qauv tsim thiab cov txheej txheem sib txawv.

Kev txo qis dej tseem ceeb:Superplasticisers tuaj yeem txo cov dej-rau-cement piv tau zoo, ua rau cov pob zeb muaj zog nrog kev txo qis thiab txhim kho durability. Qhov kev txo qis hauv cov ntsiab lus dej no kuj txo qis diffusion thiab permeability, txhim kho tag nrho cov pob zeb zoo.

Cov txiaj ntsig ntawm Plasticisers hauv pob zeb

Txhim kho lub zog:Plasticisers txhim kho lub zog ntawm cov pob zeb, ua rau nws zoo tagnrho rau ntau yam kev siv, los ntawm cov tsev nyob mus rau cov phiaj xwm loj.

Ua haujlwm tau zoo:Lawv txhim kho kev ua haujlwm ntawm pob zeb, tso cai rau nws muab tso rau hauv qhov yooj yim dua thiab du, uas tuaj yeem pab txiav cov kev xav tau ntawm kev ua haujlwm thiab txhim kho kev ua haujlwm ntawm cov chaw tsim kho.

Nce Permeability Resistance:Plasticisers txhim khu lub permeability ntawm pob zeb, txo cov dej nqus, vapor xa mus, thiab thermal tawg. Qhov no ua rau cov khoom siv ruaj khov thiab muaj zog dua.

Txo cov ntsiab lus dej:Los ntawm kev txo cov dej cov ntsiab lus, plasticisers pab ua kom muaj zog dua, ua rau cov pob zeb ua kom ntev dua.

Minimized Shrinkage:Plasticisers txo qhov qis qis hauv cov pob zeb, txo qhov kev pheej hmoo ntawm kev tawg thiab ua kom tag nrho cov khoom zoo thiab kev ncaj ncees ntawm cov qauv.

Hauv kev xaus, plasticisers ua lub luag haujlwm tseem ceeb hauv kev siv thev naus laus zis niaj hnub. Los ntawm kev txhim kho kev ua haujlwm, lub zog, thiab kev ua haujlwm ntev ntawm cov pob zeb, lawv ua rau muaj txiaj ntsig zoo thiab kev siv nyiaj ntau dua, ua rau cov qauv muaj zog thiab kav ntev.