Ua ntej txiav txim siab tus nqi ntawm gypsum retarder, nws yog ib qho tsim nyog yuav tau kuaj cov gypsum nyoos hmoov yuav. Piv txwv li, sim lub sijhawm pib thiab zaum kawg ntawm gypsum hmoov, tus qauv siv dej (uas yog, tus qauv sib xws), thiab flexural compressive zog. Yog tias ua tau, nws yog qhov zoo tshaj rau kev sim cov ntsiab lus ntawm II dej, ib nrab dej thiab anhydrous gypsum hauv gypsum hmoov. Ua ntej ntsuas qhov ntsuas ntawm gypsum hmoov kom raug, thiab tom qab ntawd txiav txim siab tus nqi ntawm gypsum retarder raws li qhov ntev ntawm lub sijhawm pib ntawm gypsum hmoov, qhov feem pua ntawm gypsum hmoov nyob rau hauv qhov yuav tsum tau gypsum mortar thiab lub sij hawm ua hauj lwm yuav tsum tau rau gypsum mortar.
Tus nqi ntawm gypsum retarder muaj ntau yam ua rau gypsum hmoov: yog tias lub sijhawm pib ntawm gypsum hmoov yog luv luv, tus nqi ntawm retarder yuav tsum loj dua; Yog hais tias lub sij hawm pib ntawm gypsum hmoov ntev, tus nqi ntawm retarder yuav tsum tsawg dua. Yog hais tias qhov kev faib ua feem ntawm gypsum hmoov nyob rau hauv lub gypsum mortar yog loj, ntau retarder yuav tsum tau ntxiv, thiab yog hais tias cov proportions ntawm gypsum hmoov yog me me, qhov feem ntawm gypsum hmoov yuav tsum tsawg dua. Yog tias lub sijhawm ua haujlwm xav tau rau gypsum mortar ntev, yuav tsum tau ntxiv retarder ntau dua, txwv tsis pub, yog tias lub sijhawm ua haujlwm yuav tsum muaj rau gypsum mortar luv luv, yuav tsum tau ntxiv retarder tsawg dua. Yog tias lub sijhawm ua haujlwm ntev dhau lawm tom qab lub gypsum mortar ntxiv nrog retarder, nws yog ib qho tsim nyog los txo cov gypsum retarder. Yog tias lub sijhawm ua haujlwm luv luv, tus nqi ntawm retarder yuav tsum tau nce ntxiv. Nws tsis yog hais tias qhov sib ntxiv ntawm gypsum retarder yog zoo li qub.
Tom qab gypsum nkag mus rau hauv lub Hoobkas, ntau cov qauv yuav tsum tau coj mus kuaj nws ntau yam ntsuas. Nws yog qhov zoo tshaj rau cov qauv thiab sim txhua ob peb hnub, vim tias nrog lub sijhawm cia ntawm gypsum hmoov, nws cov ntsuas ntau yam kuj hloov pauv. Qhov pom tseeb tshaj plaws yog tias tom qab cov hmoov gypsum muaj hnub nyoog rau lub sijhawm tsim nyog, nws lub sijhawm pib thiab zaum kawg kuj tseem yuav ntev. Lub sijhawm no, tus nqi ntawm gypsum retarder kuj yuav raug txo, txwv tsis pub lub sijhawm ua haujlwm ntawm gypsum mortar yuav ntev heev thiab nce. Nws txo cov nqi tsim khoom thaum cuam tshuam rau nws txoj haujlwm ua haujlwm thiab lub zog kawg.
Piv txwv li, yog tias koj yuav ib pawg ntawm phosphogypsum, lub sijhawm pib yog 5-6 feeb, thiab cov khoom hnyav gypsum mortar yog raws li hauv qab no:
Gypsum hmoov - 300 kg
Ntxuav xuab zeb - 650 kg
talc hmoov - 50 kg
Gypsum retarder - 0.8 kg
HPMC - 1.5 kg
Thaum pib ntawm kev tsim khoom, 0.8 kg ntawm gypsum retarder tau ntxiv, thiab lub sijhawm ua haujlwm ntawm gypsum mortar yog 60-70 feeb. Tom qab ntawd, vim yog vim li cas ntawm qhov chaw tsim kho, qhov chaw tsim kho tau raug kaw thiab kev tsim khoom tau nres, thiab cov khoom siv gypsum no tau khaws cia tsis siv. Thaum qhov chaw tsim kho rov pib dua thaum lub Cuaj Hli, qhov sib ntxiv ntawm 0.8 kg ntawm retarder tseem ntxiv thaum lub gypsum mortar tau tsim dua. Lub mortar tsis tau sim ntawm lub Hoobkas, thiab nws tseem tsis tau khov kho 24 teev tom qab nws raug xa mus rau qhov chaw tsim kho. Qhov chaw tsim kho tau hnov zoo heev. Txij li thaum cov neeg tsim khoom nkag mus rau qhov kev lag luam no tsis ntev dhau los, nws nrhiav tsis tau vim li cas, thiab nws ntxhov siab heev. Lub sijhawm no, kuv tau raug caw mus rau lub chaw tsim khoom gypsum mortar kom paub qhov laj thawj. Tom qab mus rau thawj kauj ruam, lub sij hawm pib lub sij hawm ntawm gypsum hmoov tau sim, thiab nws tau pom tias lub sij hawm pib lub sij hawm ntawm gypsum hmoov tau ncua sij hawm los ntawm qhov pib pib lub sij hawm ntawm 5-6 feeb mus rau ntau tshaj 20 feeb, thiab tus nqi ntawm gypsum retarder tsis raug txo. , yog li cov phenomenon saum toj no tshwm sim. Tom qab kev hloov kho, qhov ntau npaum li cas ntawm gypsum retarder raug txo mus rau 0.2 kg, thiab lub sijhawm ua haujlwm ntawm gypsum mortar tau luv luv rau 60-70 feeb, uas txaus siab rau qhov chaw tsim kho.
Tsis tas li ntawd, qhov piv ntawm ntau yam additives nyob rau hauv gypsum mortar yuav tsum tsim nyog. Piv txwv li, lub sijhawm ua haujlwm ntawm gypsum mortar yog 70 feeb, thiab ntxiv cov gypsum retarder kom tsim nyog. Yog lawm, yog tias ntxiv gypsum mortar tsawg dua, cov dej tuav tau qis, thiab lub sijhawm khaws dej tsawg dua 70 feeb, uas ua rau lub ntsej muag ntawm gypsum mortar poob dej sai heev, qhov chaw qhuav, thiab shrinkage. gypsum mortar yog inconsistent. Lub sijhawm no, gypsum mortar yuav poob dej. tawg.
Ob lub gypsum plaster formulation tau pom zoo hauv qab no:
1. hnyav gypsum plaster mortar formula
Gypsum hmoov (thaum pib lub sij hawm 5-6 feeb) - 300 kg
Ntxuav xuab zeb - 650 kg
talc hmoov - 50 kg
Gypsum retarder - 0.8 kg
Cellulose ether HPMC(80,000-100,000 cps)-1.5kg
Thixotropic lubricant - 0.5 kg
Lub sijhawm ua haujlwm yog 60-70 feeb, tus nqi tuav dej yog 96%, thiab lub teb chaws tus qauv dej tuav tus nqi yog 75%
2 .lub teeb gypsum plaster mortar formula
Gypsum hmoov (thaum pib lub sij hawm 5-6 feeb) - 850 kg
Ntxuav xuab zeb - 100 kg
talc hmoov - 50 kg
Gypsum retarder - 1.5 kg
Cellulose ether HPMC (40,000-60,000)-2.5 kg
Thixotropic lubricant - 1 kg
Vitrified hlaws - 1 cubic
Post lub sij hawm: Dec-08-2022