Yuav ua li cas gypsum cuam tshuam rau lub sijhawm teem ntawm cement?
Yuav ua li cas gypsum cuam tshuam rau lub sijhawm teem ntawm cement?

Video: Yuav ua li cas gypsum cuam tshuam rau lub sijhawm teem ntawm cement?

Video: Yuav ua li cas gypsum cuam tshuam rau lub sijhawm teem ntawm cement?
Video: Yuav ua li cas rau lub rooj origami 8feeb yooj yim los siv 2daim Me Nyuam Cov Me Nyuam Yaus Txoj Cai 2024, Kaum ib hlis
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Lub retardation mechanism ntawm gypsum yog : thaum twg xis mas yog hydrated, gypsum reacts nrog C3A sai sai tsim calcium sulfoaluminate hydrate uas tso nyiaj thiab tsim cov yeeb yaj kiab tiv thaiv ntawm cement particles los cuam tshuam cov dej ntawm C3A thiab ncua sijhawm teem sijhawm ua haujlwm.

Hauv qhov no, vim li cas gypsum tau ntxiv rau hauv cov cement?

Thaum twg cement yog sib xyaw nrog dej, nws dhau los ua lub sijhawm ntev. Qhov no yog hu ua kev teeb tsa cement . Gypsum feem ntau ntxiv rau Portland cement rau tiv thaiv thaum ntxov hardening los yog "flash setting", cia ua hauj lwm raws sij hawm. Gypsum slows qhov chaw ntawm cement yog li ntawd cement yog txaus txaus.

Ib sab saum toj no, uas txo tus nqi ntawm kev teeb tsa cov cement? Gypsum ntxiv rau cement rau txo tus kev teeb tsa tus nqi ntawm cement uas yog nce kev teeb tsa sij hawm

Ib sab saum toj, ntau npaum li cas gypsum ntxiv rau cov cement?

Rau Portland zoo tib yam cement , nws tseem nyob nruab nrab ntawm 3 txog 4% thiab nyob rau qhov xwm txheej ceev cement , nws tuaj yeem txo qis txog 2.5%. Lub hom phiaj tseem ceeb ntawm ntxiv gypsum hauv cement yog kom qeeb cov txheej txheem hydration ntawm cement ib zaug nws yog tov nrog dej.

Lub sijhawm teeb tsa ntawm pob zeb yog dab tsi?

Pib teem sijhawm lub sijhawm yuav tsum tau ua kom ncua cov txheej txheem dej los yog tawv. Kawg teem sijhawm yog sij hawm thaum lub paste kiag li poob nws splasticity. Nws yog sij hawm coj rau cement xibhwb cement pob zeb kom tawv txaus thiab ua kom lub ntsej muag ntawm cov pwm uas nws raug pov.

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