Gypsum yog siv dav heev - ob qho tib si hauv kev tsim kho thiab hauv tsev xav tau. Gypsum yog yooj yim siv rau ntau yam khoom siv tes ua, khoom siv tes ua, rau cov duab puab duab puab ntawm nws.
Cov Lus Qhia
Kauj ruam 1
Plaster ntawm paris yog hmoov dawb nrog qhov ntxoov ntxoo grey. Cov xim grey nrog ntxiv ntawm dej los ua ntej. Gypsum sib txawv raws li qhov sib tsoo: muaj gypsum ntawm kev ua kom zoo, nruab nrab thiab ntxhib kev sib tsoo. Gypsum cov khoom lag luam muaj lub zog nrog cov nyhav qis, tab sis kuj muaj qhov tsis zoo. Nws qhov solidification tus nqi yog siab heev. Yog vim li cas koj thiaj li yuav tsum paub tseeb yuav ua li cas kom txhawm rau txhaws gypsum, vim tias yuav tsis muaj sijhawm los daws thiab ntxiv ib yam dab tsi, cov khoom siv raw yuav sib zog. Lub gypsum yuav tsum tsis txhob do ntau dhau - nws yuav ua rau ntau txawm sai dua. Cov plaster tau kneaded ua ntu me me, thiab tus tswv tsuas muaj ob peb feeb los sib xyaw ua ke thiab siv rau hauv kev coj ua.
Kauj ruam 2
Ib lub lag luam ntawm gypsum siv rau kev ua haujlwm yuav tsum muaj kev tshwj xeeb kev zom, hauv dej tsis ntxiv rau cov hmoov, tab sis cov hmoov muaj nchuav rau hauv dej. Lub peev xwm rau diluting lub gypsum yuav tsum yog xws li tias nws muaj peev xwm tom qab ntawd ua tiav zoo tawg ntawm phab ntsa. Cov taub ntim yas thiab hlau ua haujlwm zoo. Cov xaum pov thawj yog feem ntau yog ib feem dej rau ob ntu hmoov. Lub hmoov tau nchuav mus rau hauv cov dej maj mam, kis mus thoob thaj chaw, thiab maj mam nplawm kom txog thaum cov dej noo tag nrog cov hmoov ntawd. Tom qab 2-3 feeb kev daws teeb meem yuav tsum sawv ntsug thiab tuab yam uas tsis muaj nplawm. Daim paib hais tias gypsum tuaj yeem siv yog tias cov tshuaj khib tau ntom ntom thiab sov me ntsis ua kom sov. Tom qab cov hmoov tov tau dej nrog dej thiab pib ua kom tuab, lub Cheebtsam tsis tuaj yeem muab ntxiv rau qhov kev daws teeb meem. Xws li txoj kev daws teeb meem yuav tsum tau piam, vim tias nws cov yam ntxwv astringent yuav tsawg.
Kauj ruam 3
Tus nqi kho tau zoo yog qhov tsis zoo ntawm kev sib xyaw ntawm gypsum, thiab ntau txoj kev tau tsim los nrog nws. Ua ntej tshaj plaws, qhov no yog qhov kev npaj ntawm gypsum muab tshuaj txhuam. Cov tsiaj muaj raws li nram no - ntxiv 15 g ntawm ntoo kua nplaum rau lub thoob dej. Koj tuaj yeem nqa PVA kua nplaum. Rau kev npaj, dej thiab kua nplaum yog huv si sib tov, thiab tsuas yog tom qab ntawd cov gypsum yog nchuav. Xws li qhov sib tov pib thaum kawg teeb tsa nyob rau hauv kwv yees li 20 feeb tom qab nws tau npaj, uas yog qhov txaus rau ntau yam kev npaj ua ntej thiab kho qhov tsis raug. Hauv kev xaiv ua noj, tib txoj cai no siv - tsis ntxiv ib qho ntxiv tom qab tshaj lwm tus. Yog hais tias tus ntsuas ntawm qhov kev daws teeb meem tig mus rau qhov tsis tsim nyog tag nrho, nws yog qhov zoo dua rau pov tseg thiab pib dua.
Kauj ruam 4
Txhawm rau kom qeeb ntawm lub solidification, ntxiv citric lossis tartaric acid. Cov koob tshaj rau cov txiv qaub yog 0, 1-0, 2% ntawm qhov hnyav ntawm gypsum. Cov kua qaub yog ua ntej kom huv nrog dej, ces gypsum ntxiv. Nyob rau hauv tib kis, yog tias nws tsim nyog, ntawm qhov tsis sib xws, kom txo lub sijhawm tawv ntawm gypsum, ntsev ntxiv rau hauv dej los npaj qhov kev daws, nplawm kom huv.
