Puas yog polycarboxylic acid superplasticizer tsis zoo rau cov cement? Tej zaum nws yuav cuam tshuam los ntawm cov xwm txheej no

Piv rau cov tshuaj naphthalene-raws li thiab lignin-based superplasticizers, polycarboxylate superplasticizers muaj qhov zoo xws li kev siv qis dua, txo cov dej ntau dua, kev tuav pov hwm zoo dua, thiab kev phooj ywg ib puag ncig. Txawm li cas los xij, zoo li lwm cov tshuaj superplasticizers, polycarboxylate superplasticizers kuj ntsib teeb meem kev sib raug zoo nrog cov cement.

Muaj ntau qhov laj thawj rau qhov teeb meem no, suav nrog cov qauv molecular thiab cov yam ntxwv ntawm kev ua haujlwm ntawm polycarboxylate superplasticizers, cov khoom ntawm cov cement, cov aggregates siv hauv cov pob zeb, cov khoom sib xyaw, sib tov sib xyaw, kev sib xyaw ua ke, thiab kev tsim kho. Ntawm no, peb yuav txheeb xyuas seb cov yam ntxwv ntawm cov cement cuam tshuam li cas.

Cov yam tseem ceeb hauv cov khoom cement uas cuam tshuam rau kev sib raug zoo suav nrog:

• Mineral Composition ntawm Cement Clinker

Cov ntxhia hauv cov cement clinker feem ntau suav nrog C3S, C2S, C3A, thiab C4AF. Ntawm cov no, C3A muaj kev cuam tshuam loj rau kev sib raug zoo. Raws li cov ntsiab lus C3A nce, kev sib raug zoo zuj zus ntxiv; conversely, raws li C3A cov ntsiab lus txo, compatibility txhim kho. Qhov no yog vim hais tias tus nqi dej ntawm C3A muaj feem xyuam rau crystal defects. Lub hydration ntawm C3A siv dej ntau thiab superplasticizer, ua rau tsawg dua dawb superplasticizer molecules adsorbed rau saum npoo ntawm cov cement hais, yog li cuam tshuam rau kev sib raug zoo.

• Daim ntawv thiab Parameters ntawm gypsum

Gypsum ua raws li kev teeb tsa hauv kev tsim cov cement thiab feem ntau muaj nyob rau hauv peb hom: dihydrate gypsum, anhydrous gypsum, thiab desulfurized gypsum. Tus nqi uas SO42- raug tso tawm kom hnov ​​​​mob nrog C3A tswj kev teeb tsa thiab lub sijhawm hardening ntawm cov cement. Desulfurized gypsum tso tawm SO42- sai sai, thaum anhydrous gypsum tso nws qeeb dua. Yog li ntawd, cov cement siv desulfurized gypsum raws li tus neeg tswj xyuas yuav muaj kev sib raug zoo nrog cov superplasticizers, thaum cov cement nrog anhydrous gypsum qhia tau tias tsis zoo sib xws.

• Fineness ntawm Cement Particles

Qhov zoo ntawm cov cement particles cuam tshuam rau lawv cov flocculation. Cov khoom me me nthuav tawm ntau tshaj tawm flocculation, xav tau ntau superplasticizer kom txo cov nyhuv no. Tsis tas li ntawd, cov khoom me me ua rau cov dej nrawm dua ntawm C3A, txo cov concentration ntawm superplasticizer molecules hauv flocculated system. Yog li ntawd, qhov zoo dua cov cement hais, qhov tsis zoo ntawm cov cement thiab superplasticizer. Thaum qhov zoo ntawm cov cement hais zoo ib yam, cov ntsiab lus ntawm cov khoom me dua 3 μm muaj kev cuam tshuam ntau dua rau kev tawg ntawm superplasticizer.

• Tus nqi thiab hom Admixtures hauv Cement

Portland cement feem ntau suav nrog qee qhov sib xyaw ua ke, xws li ya tshauv, granulated blast-kub slag, thee gangue, limestone, thiab zeolite. Fly tshauv tuaj yeem txhim kho cov dej ntws ntawm cov cement los ntawm cov txiaj ntsig pob-cov kabmob, txhim kho cov kav ntev thiab ntom ntawm cov pob zeb. Txawm li cas los xij, vim nws cov ntsiab lus carbon siab, ya tshauv tuaj yeem nqus cov khoom siv superplasticizers ntau dua li cov cement hais, ua rau poob sai sai txawm tias pib ua haujlwm tau zoo. Nyob rau hauv sib piv, granulated blast-qhov cub slag nthuav tawm tsawg adsorption ntawm superplasticizers, thiab muab nws nrog limestone tuaj yeem txhim kho cov cement compatibility nrog superplasticizers. Tsis tas li ntawd, zeolite thiab thee gangue muaj zog adsorption los ntawm superplasticizers, uas ua rau tsis zoo sib xws.

• Cov ntsiab lus Alkali hauv Cement

Cov alkali ntau dhau tuaj yeem cuam tshuam nrog cov tshuaj reactive nyob rau hauv aggregates, ua rau cov pob zeb tawg thiab txo cov nyhuv plasticizing ntawm cov cement paste, uas ua rau cov dej ntws nrawm. Hloov pauv, yog tias cov ntsiab lus alkali tsawg dhau, tsis txaus superplasticizer kuj tuaj yeem ua rau poob qis sai. Kev tshawb fawb qhia tau hais tias thaum cov ntsiab lus alkali nyob nruab nrab ntawm {{0}}.4% thiab 0.8%, nws muaj kev cuam tshuam me me rau kev sib raug zoo ntawm superplasticizer nrog cement.

• Freshness thiab Kub ntawm Cement

Lub fresher cov cement, qhov tsis zoo ntawm kev sib raug zoo nrog superplasticizers; Ib yam li ntawd, qhov kub siab dua kuj ua rau tsis zoo sib xws. Yog li ntawd, nws yog ib qho tseem ceeb uas yuav tau xav txog qhov tshiab thiab kub ntawm cov cement thaum siv superplasticizers.

Ntau yam hauv cov khoom cement cuam tshuam rau kev sib raug zoo. Thaum tsim cov pob zeb, nws yog ib qho tseem ceeb uas yuav tau xav txog cov ntxhia hauv cov cement (C3A), fineness thiab particle grading, hom admixtures, gypsum forms, thiab alkali cov ntsiab lus nyob rau hauv thiaj li yuav tsim cov tsim nyog hom thiab ua ke ntawm superplasticizers. Tsis tas li ntawd, cov cement tshiab yuav tsum tau tso cai so rau qee lub sijhawm ua ntej siv.