Cov khoom tseem ceeb ntawm cov pob zeb muaj xws li cov cement (nrog rau cov khoom siv cementitious xws li cov hmoov ntxhia,ya tshauv, thiab lwm yam), aggregates (xuab zeb, pob zeb, ceramsite, thiab lwm yam), dej, thiab admixtures.
Lub sij hawm ua vaj tse feem ntau yog hais txog cov cement pob zeb ua cov khoom siv cementitious, xuab zeb thiab pob zeb ua aggregate; nws yog tov nrog dej (uas tej zaum yuav muaj admixtures thiab admixtures) nyob rau hauv ib tug tej yam kev faib ua feem, thiab cov cement pob zeb tau los ntawm stirring kuj hu ua cov pob zeb zoo tib yam. Qhob, uas yog dav siv nyob rau hauv civil engineering.
Pob zeb muaj cov yam ntxwv ntawm cov khoom siv raw, cov nqi qis, thiab cov txheej txheem tsim khoom yooj yim, yog li nws cov khoom siv tau nce ntxiv. Nyob rau tib lub sijhawm, pob zeb tseem muaj cov yam ntxwv ntawm lub zog siab compressive, zoo durability, thiab ntau yam ntawm cov qib zog.
Cov yam ntxwv no ua rau nws siv dav, tsis yog tsuas yog hauv ntau yam kev tsim vaj tsev hauv pej xeem tab sis kuj hauv kev tsim khoom hauv nkoj, kev lag luam tshuab, kev tsim kho dej hiav txwv, engineering geothermal, thiab lwm yam. Cov pob zeb tseem yog cov khoom siv tseem ceeb.
Hauv pob zeb, xuab zeb thiab pob zeb ua lub luag haujlwm ntawm cov pob txha, uas yog hu ua aggregate; cement thiab dej tsim cov cement slurry, thiab cov cement slurry wraps saum npoo ntawm cov aggregate thiab puv nws voids. Ua ntej hardening, lub grout plays lub luag hauj lwm lubricating, muab cov khoom sib tov ua haujlwm thiab ua kom yooj yim rau kev tsim kho. Tom qab cov cement paste hardens, cov aggregate yog cemented rau hauv ib qho khoom tag nrho.
Kev xaiv ntawm qib cement yuav tsum sib haum nrog cov qauv tsim lub zog ntawm cov pob zeb. Nyob rau hauv txoj cai, high-strength qib pob zeb yog npaj, thiab high-qib cement yog siv; thaum npaj cov pob zeb uas muaj zog tsawg, cov cement qis tau raug xaiv.
Yog tias tsim nyog siv cov cement qib siab los npaj cov pob zeb qis qis, cov cement yuav tsawg dhau, uas yuav cuam tshuam rau kev ua haujlwm thiab compactness, yog li yuav tsum tau ntxiv qee cov khoom sib xyaw. Yog tias tsim nyog siv cov cement qib qis los npaj cov pob zeb ua kom muaj zog, cov cement yuav ntau dhau, uas tsis yog kev lag luam thiab yuav cuam tshuam rau lwm yam khoom ntawm pob zeb.
Post lub sij hawm: Oct-08-2022