Dab tsi yog hom cement sib txawv?

2024 Tus sau: Howard Calhoun | [email protected]. Kawg hloov kho: 2023-12-17 10:28

Cement yog ib qho ntawm cov khoom siv tseem ceeb tshaj plaws hauv tsev, tsis muaj kev tsim kho niaj hnub ua tsis tau. Raws li ib feem, nws yog siv rau kev tsim khoom ntawm ntau yam kev daws teeb meem thiab kev sib tov. Txhua lub tsev tsim tsa hauv 200 xyoo dhau los tau tsim nrog nws txoj kev koom tes. Dab tsi yog ua los ntawm cov cement, hom twg muaj nyob thiab siv qhov twg? Wb sim teb tag nrho cov lus nug no.

Composition

Cov khoom pib yog cov hmoov qhuav ntawm cov khoom siv dag zog. Nws yog tau los ntawm kev sib tsoo thiab sib tov clinker, gypsum, nrog rau ntau yam muab tub lim thiab additives. Txawm li cas los xij, nws yog clinker uas yog lub hauv paus ntawm kev sib xyaw. Nws yog tau los ntawm kev sib tsoo thiab roasting limestone, av nplaum thiab ntau yam minerals. Nyob ntawm qhov feem pua ntawm cov ntsiab lus hauv cov ntsiab lus ntawm cov khoom no, cov khoom thiab thaj tsam ntawm kev siv cov cement yuav txawv.

Dab tsi yog ua los ntawm cov cement thaum lub sij hawm tsim kho yog raws li cov tshuaj tiv thaiv nyob rau hauv uashmoov thaum interacting nrog dej hloov mus rau hauv ib lub khob noom cookie. Nyob rau hauv lub neej yav tom ntej, nyob rau hauv tej yam physico-tshuaj txheej txheem, cov kua sib tov yog hloov mus rau hauv ib tug khoom. Yog li ntawd, cov cement sib tov tau txais cov qauv zoo li pob zeb.

Hais txog dab tsi yog ua los ntawm cov cement, ib qho tuaj yeem ua ntej ntawm tag nrho cov kev npaj sib xyaw ua ke, cov khoom siv ntxiv dag zog tsim los ntawm lub Hoobkas lossis ncaj qha ntawm qhov chaw tsim kho. Nws kuj yog siv los tsim cov ntaub ntawv asbestos-cement, plaster, masonry thiab lwm yam vaj tsev sib xyaw thiab mortars.

Tam sim no, txog 40 hom cement tau paub, txhua tus pom nws daim ntawv thov los tsim ib qho kev tsim tshwj xeeb. Xav txog qee yam.

Portland cement

Qhov no yog hom siv ntau tshaj plaws rau cov khoom ua vaj tsev precast. High-quality npaj-mixed qhob yog tsim los ntawm nws, uas yog siv nyob rau hauv kev tsim kho los tsim load-bearing ntsiab ntawm lub tsev thiab cov qauv. Yog tias koj ntseeg cov txheeb cais, ces nws suav txog li 60% ntawm tag nrho cov ntim ntawm cov khoom tsim cov cement hauv ib xyoos. Tsis tas li ntawd, nws yog Portland cement clinker uas yog lub hauv paus rau kev tsim khoom ntawm lwm hom cement. Cov kab ke, phab ntsa, thiab cov cement slabs tuaj yeem tsim los ntawm cov khoom siv hauv tsev no.

Dawb thiab xim Portland cement

Pom tseeb, Portland cement zoo tib yam yog grey, vim nws muaj ntau cov hlau thiab manganese. Tab sis yog tias cov ntsiab lus ntawm cov oxides hauv lub clinker yog qhov tsis tseem ceeb, thiab thaum twgnws cov khoom siv cov av nplaum dawb, ces Portland cement sib tov tau txais lub teeb xim dawb. Nws tsis yog siv los tsim cov khoom siv thauj khoom ruaj khov. Feem ntau nws yog siv rau kev kho kom zoo nkauj thiab ua tiav.

Ib yam ntawm kev tsim cov khoom yog cov khoom siv raw raug rho tawm ntawm cov roj tshauv tshwj xeeb.

Raws li cov ntaub ntawv tsis-ferrous, lawv yog tsim los ntawm cov xim dawb Portland cement. Ib qho me me ntawm gypsum thiab ib qho xim tshwj xeeb muab tso rau hauv tsuas yog ntxiv rau nws. Nws yog ib qho yooj yim los twv seb nws yog siv rau cov hom phiaj kho kom zoo nkauj, tshwj xeeb tshaj yog, kom tau txais cov xim xim, ua cov ntsiab lus thiab cov ntsiab lus, thiab ua cov khoom muag.

Slagportlandcement

Qhov no belongs rau pawg ntawm hydraulic binders. Nws yog tsim los ntawm kev sib tsoo thiab tom qab sib tsoo ntawm Portland cement clinker, moj tej tawg rauv slag thiab lub tsev gypsum. Nws paub tias ntau yam phab ntsa thaiv, tsev sib tov qhuav thiab plaster hauv paus yog tsim los ntawm hom cement.

Kev nthuav dav

Cov khoom siv no kuj yog cov pab pawg ntawm hydraulic binders. Nws muaj qhov sib txawv ntawm lwm cov ntaub ntawv, uas, thaum siv, txo qhov ntim thiab loj. Expanding cement tsis shrinkage. Ntxiv mus, cov txheej txheem hydration thiab hardening yog nrog los ntawm ntim expansion, tshwj xeeb tshaj yog nyob rau hauv thawj theem tom qab teeb.

hom cement no yog siv rau kev tsim cov tshuaj txhaj tshuaj thiab kho cov tshuaj uas siv rau hauv kev kho dua ntawm cov pob zeb puasdesigns.

Zaj lus

Muab cov khoom ntawm cov khoom no, txhua yam tuaj yeem ua los ntawm nws. Tsis muaj dab tsi tiv thaiv koj los ntawm kev tsim vaj huam sib luag phab ntsa lossis cov vuas cement-xuab zeb raws li nws. Yuav luag txhua qhov tseeb thiab txawm tias qhov tsis sib xws ntawm lub tsev tsim tuaj yeem tsim hauv cov chaw tsim khoom thiab txawm nyob rau ntawm qhov chaw tsim kho.

Cov khoom siv ntau yam no yog cov caj qaum ntawm txhua lub tsev tsim. Cov vaj tse ib txwm pib ua nrog lub hauv paus, uas yuav tsum tau ua raws li cov pob zeb muaj zog uas tsim los ntawm cov cement sib tov. Tsis tas li ntawd, thaum lub sij hawm tsim kho, siv cov pob zeb ua vaj tse ntxiv, thiab kev tsim kho tiav nrog lub ru tsev npog cov cuab yeej, nyob rau hauv daim ntawv ntawm cov cement-xuab zeb vuas tuaj yeem ua. Nws tau dhau los ua neeg nyiam heev tsis ntev los no. Tsis tas li cov khoom siv kho kom zoo nkauj feem ntau yog siv cov cement mortar.

Yog li ntawd, qhov tseem ceeb ntawm cov khoom siv hauv kev tsim kho niaj hnub no tsis tuaj yeem kwv yees ntau dhau. Qhov no yog qhov pheej yig tshaj plaws, yooj yim tshaj plaws thiab ruaj khov, kev siv uas yog 100% ncaj ncees.