Cement vs Mortar
Nyob rau theem dhau los, tib neeg tsis muaj tsev nyob, thiab lawv siv tej yam yooj yim uas pom los ntawm ib puag ncig los tsim tsev. Tab sis niaj hnub no muaj ntau yam khoom siv thiab cov cuab yeej siv siab heev, uas pab hauv kev tsim kho. Cement yog ib yam khoom zoo heev ntawm lawv. Ua ntej tsim cov txheej txheem siab, uas muaj nyob rau hauv kev ua lag luam niaj hnub no, muaj ntau hom cement ua los ntawm limestone. Cov cements yav dhau los tsis ruaj khov, thiab lawv tsis yog tus neeg sawv cev zoo. Txawm li cas los xij, niaj hnub no cement tau hloov zuj zus raws li nws tau dhau los ua cov khoom siv txhim khu kev qha.
Cement
Cement muaj keeb kwm ntev. Nws yog cov khoom siv khi siv los khi cov khoom ua ke feem ntau hauv kev tsim kho vaj tse. Nws cov cuab yeej los tswj nws raws li peb xav tau thaum nws tov nrog dej yog qhov zoo kawg li. Thiab tom qab ntawd thaum nws raug tso cai kom qhuav nws khi lwm yam khoom ua ke thiab dhau los ua ib yam khoom nyuaj heev. Tsis tas li ntawd, tsis muaj kev puas tsuaj rau cov cement thaum nws raug dej tom qab nws qhuav, thiab cov cuab yeej ntawm cov cement no ua rau nws tsim nyog rau kev siv dav hauv kev tsim vaj tsev. Raws li cov khoom siv cementing, tib neeg yav dhau los tau siv ntau yam khoom los ntawm ntau qhov chaw. Cov neeg Iyiv siv calcined gypsum ua cov khoom siv cement los tsim lawv cov pyramids. Ancient Greek thiab Roman cov neeg siv rhuab limestone ua cov khoom siv cement. Cement yog cov hmoov grey zoo heev thiab yog cov khoom tseem ceeb ntawm pob zeb. Cov txheej txheem tsim cov cement pib nrog kev sau cov limestone thiab lwm yam khoom siv raw. Cov limestone yog ua ke nrog av nplaum, thiab lawv yog av nyob rau hauv ib tug crusher. Xuab zeb, hlau thiab hauv qab tshauv kuj ntxiv rau qhov sib tov, thiab nws raug tso cai rau hauv av rau hauv cov hmoov zoo. Cov hmoov zoo no tau dhau los ntawm lub tshuab hluav taws xob ua ntej mus rau hauv lub qhov cub loj thaum cua sov. Hauv qhov cub, qhov sib tov yog rhuab mus rau 1500 0C. Cov cua kub hloov qhov sib tov rau hauv cov khoom tshiab hu ua clinker, uas zoo li pellets. Clinker yog tom qab ntawd tov nrog gypsum thiab limestone thiab hauv av rau cov hmoov zoo heev. Kev tsim cov cement yuav tsum muaj cov tshuab loj, muaj zog thiab ntau cov txheej txheem ib txhij koom nrog. Muaj ntau hom cements xws li Portland cements, Portland blend cements (Portland flyash cement, Portland pozzolan cement, Portland silica fume cement, expansive cement), tsis yog Portland hydraulic cements (super sulfated cement, slag-lime cement, calcium sulfoaluminate cement) etc.
Muaj
Mortar yog sib tov ntawm xuab zeb, cement, txiv qaub thiab dej. Thaum cov no sib tov ua ke, ib qho muab tshuaj txhuam zoo li sib tov yog tsim, thiab nws tuaj yeem siv rau lub tsev. Feem ntau, qhov no yog qhov sib tov siv los sau qhov khoob ntawm pob zeb, cib lossis blocks thiab khi lawv ua ke. Cov tshuaj nplaum no tuaj yeem siv rau qhov twg peb xav tau, thiab nws hardens tom qab nws qhuav. Thaum kawg nws yuav muaj zog heev. Thaum tsis muaj cement, av nplaum thiab av nkos tau siv los ua mortar thaum ub.
Qhov txawv ntawm Cement thiab mortar yog dab tsi?
• Cement is an agredient in mortar.
• Cement ib leeg siv tsis tau rau hauv masonry; nws yuav tsum tau tov nrog lwm cov ntaub ntawv los ua mortar. Thiab mortar siv tau rau hauv masonry.
