Lub tsev gypsum muab faib ua peb qib: zoo heev, qib thawj thiab tsim nyog.
Qhov ntom ntawm lub tsev gypsum yog 2.502.80g / cm3, thiab qhov ntom ntom yog 800-1100kg / m3. Lub tsev gypsum muaj cov yam ntxwv hauv qab no:
(1) Cov porosity loj (kwv yees li 50 feem pua -60 feem pua) thiab tsis muaj zog. Cov dej theoretical xav tau ntawm gypsum yog 18.6 feem pua, tab sis txhawm rau ua kom gypsum muaj qhov tsim nyog plasticity, cov dej feem ntau yog ntxiv mus txog 60 feem pua -80 feem pua, tawm hauv ntau qhov pores tom qab evaporation ntawm dej, yog li cov dej feem ntau yog ntxiv rau 60 feem pua -80 feem pua. porosity loj heev. Lub zog ntawm thawj chav kawm gypsum tom qab hardening yog li ntawm 5-8MPa rau 1 hnub, thiab lub zog siab tshaj plaws tuaj yeem ncav cuag 8-12MPa rau 7 hnub
(2) ceev ceev thiab hardening. Nws tuaj yeem teem sijhawm li ntawm 3 mus rau 5 feeb, thiab qhov chaw zaum kawg yuav tsum tsis pub tshaj 30 feeb. Nws yog ib qho tsim nyog yuav tau ntxiv tus neeg sawv cev retarding hauv daim ntawv thov. Piv txwv li, xuab zeb, sodium potassium tartrate, wring acanthic acid, polyvinyl cawv, txiv qaub activated pob txha kua nplaum los yog daim tawv nqaij kua nplaum.
(3) Lub ntim nthuav me ntsis tom qab hardening, thiab tus nqi nthuav dav yog li 1 feem pua.
(4) tsis zoo dej tsis kam thiab Frost tsis kam. Architectural gypsum muaj zog hygroscopic khoom tom qab hardening. Nyob rau hauv ib puag ncig ntub, kev sib raug zoo ntawm cov muaju tsis muaj zog thiab lub zog yog txo qis. Cov dej hauv qhov pores khov, ua rau cov gypsum tawg.
(5) Kev tiv thaiv hluav taws zoo. Nyob rau hauv cov ntaub ntawv ntawm hluav taws, lub crystalline dej ntawm dihydrous gypsum evaporates thiab absorbs tshav kub. Lub anhydrous gypsum generated rau saum npoo yog ib qho zoo insulator.
