A: Tom qab cov qhob yog nchuav, cov slurry tsis muaj lub zog tsis tau, thiab qhov tawv ntawm cov pob zeb ua yog nyob ntawm qhov tawv ntawm cov cement. Piv txwv li, lub sijhawm pib lub sijhawm ntawm kev sib koom ua ke Portland yog 45 feeb yog, cov qhob thiab nws muaj peev xwm dhau los yog 10 teev. Yog tias koj xav nce qhov teeb tsa tus nqi ntawm cov pob zeb ua, koj yuav tsum tau siv cov roj hluav taws xob rau kev kho kom huv. Koj feem ntau feem ntau pom tias tom qab cov qhob yog nchuav, nws yuav tsum tau nchuav nrog dej. Qhov no yog vim tias cov cement yog cov khoom siv hlwb hydraulic, thiab qhov tawv ntawm cov cement yog hais txog qhov kub thiab txias thiab av noo. Cov txheej txheem ntawm kev tsim cov ntsuas kub uas haum rau cov pob zeb ua kom yooj yim los pab txhawb nws cov hydration thiab qhov nyuaj yog hu ua kev kho. Cov ntsiab lus yooj yim rau kev txuag hluav taws xob thiab av noo. Raws li raws li kom muaj qhov kub thiab txias thiab tsim nyog, kev hydration ntawm xis mas tuaj yeem ua tiav txoj kev txhim kho ntawm kev txhim kho lub zog. Qhov kub thiab txias ib puag ncig muaj kev cuam tshuam muaj txiaj ntsig zoo ntawm kev haus dej ntawm xis mas. Qhov siab dua qhov ntsuas kub, qhov nrawm dua ntawm cov nqi ntawm cov dej kas fes, thiab lub zog nrawm ntawm cov qhob zog tsim. Qhov chaw uas cov pob zeb ua dej ntub yog ntub, uas yog qhov zoo rau nws cov tawv tawv.
Lub Sijhawm Post: Apr-14-2023
