Usati waona kuwanda kwegypsum retarder, zvinodikanwa kuti uedze iyo mbishi gypsum poda yakatengwa. Semuenzaniso, edzai nguva yekutanga uye yekupedzisira yekugadzika kwegypsum powder, kushandiswa kwemvura kwakadzika (kureva, kuwirirana), uye flexural compressive simba. Kana zvichibvira, zvakanakisisa kuedza zvinyorwa zve II mvura, semi-mvura uye anhydrous gypsum mu gypsum powder. Kutanga kuyera zviratidzo zve gypsum powder nenzira yakarurama, uye wozotarisa kuwanda kwegypsum retarder maererano nehurefu hwekutanga kugadzika nguva yegypsum powder, chikamu chegypsum powder mune inodiwa gypsum mortar uye nguva yekushanda inodiwa gypsum mortar.
Nhamba ye gypsum retarder ine zvakawanda zvokuita ne gypsum powder: kana nguva yekutanga yekugadzirisa gypsum powder ipfupi, chiyero chekugadzirisa chinofanira kuva chikuru; kana nguva yekutanga yekugadzika yegypsum powder yakareba, chiyero che retarder inofanira kuva shoma. Kana chikamu chegypsum powder mu gypsum mortar yakakura, yakawanda retarder inofanira kuwedzerwa, uye kana chikamu chegypsum powder chiri chiduku, chikamu chegypsum powder chinofanira kunge chiri zvishoma. Kana iyo nguva yekushanda inodiwa yegypsum mortar yakareba, yakawanda retarder inofanira kuwedzerwa, kana zvisina kudaro, kana nguva yekushanda inodiwa yegypsum mortar ipfupi, retarder shoma inofanira kuwedzerwa. Kana nguva yekushanda yakanyanyisa mushure mokunge gypsum mortar ichiwedzerwa ne retarder, zvakakosha kuderedza kuwanda kwegypsum retarder. Kana nguva yekushanda ipfupi, chiyero che retarder chinofanira kuwedzerwa. Hazvirevi kuti kuwedzerwa kwegypsum retarder kwakamira.
Mushure mokunge gypsum yapinda mufekitari, sampuli dzakawanda dzinofanira kutorwa kuti dziedze zviratidzo zvayo zvakasiyana. Zvakanakisisa kuenzanisa uye kuedza mazuva mashomanana, nokuti nenguva yekuchengetedza yegypsum powder, zviratidzo zvayo zvakasiyana-siyana zviri kuchinjawo. Chinhu chinonyanya kujeka ndechokuti mushure mokunge gypsum powder yakwegura kwenguva yakakodzera, nguva yayo yekutanga uye yekupedzisira yekugadzirisa ichawedzerwawo. Panguva ino, chiyero chegypsum retarder chichaderedzwawo, kana zvisina kudaro nguva yekushanda yegypsum mortar ichawedzerwa zvikuru uye inowedzera. Inoderedza mari yekugadzira ichikanganisa kushanda kwayo uye simba rekupedzisira.
Semuenzaniso, kana iwe ukatenga batch yephosphogypsum, yekutanga yekugadzika nguva ndeye 5-6 maminetsi, uye kugadzirwa kweinorema gypsum mortar kunotevera:
Gypsum powder - 300 kg
Jecha rakashambidzwa - 650 kg
Talc hupfu - 50 kg
Gypsum retarder - 0.8 kg
HPMC - 1.5 kg
Pakutanga kwekugadzirwa, 0.8 kg yegypsum retarder yakawedzerwa, uye nguva yekushanda yegypsum mortar yaiva 60-70 maminitsi. Gare gare, nokuda kwezvikonzero panzvimbo yokuvaka, nzvimbo yokuvaka yakavharwa uye kugadzirwa kwakamira, uye iyi batch yegypsum powder yakachengetwa pasina kushandiswa. Apo nzvimbo yekuvaka yakatangazve munaSeptember, kuwedzerwa kwe 0.8 kg ye retarder yakanga ichiri kuwedzerwa apo gypsum mortar yakagadzirwa zvakare. Dhaka racho harina kuedzwa pafekitari, uye harina kusimba maawa 24 pashure pokunge ratumirwa kunzvimbo yokuvaka. Nzvimbo yokuvaka yakaita zvakasimba. Sezvo mugadziri akapinda muindastiri iyi nguva pfupi yapfuura, haana kukwanisa kuwana chikonzero, uye ainetsekana zvikuru. Panguva iyi, ndakakokwa kuti ndiende kumugadziri wedhaka regypsum kuti ndizive chikonzero. Mushure mokuenda kune danho rekutanga, nguva yekutanga yekuisa gypsum powder yakaedzwa, uye yakawanikwa kuti nguva yekutanga yekugadzika yegypsum powder yakawedzerwa kubva panguva yepakutanga yekutanga nguva ye 5-6 maminitsi kusvika kupfuura maminitsi makumi maviri. uye kuwanda kwegypsum retarder hakuna kuderedzwa. , saka chiitiko chiri pamusoro chinoitika. Mushure mekugadzirisa, kuyerwa kwegypsum retarder kwakaderedzwa kusvika 0.2 kg, uye nguva yekushanda yegypsum mortar yakapfupiswa kusvika maminitsi 60-70, iyo yakagutsa nzvimbo yekuvaka.
Mukuwedzera, chiyero chezvinowedzera zvakasiyana-siyana mu gypsum mortar inofanira kuva inonzwisisika. Semuenzaniso, nguva yekushanda yegypsum mortar ndeye 70 maminitsi, uye chiyero chakanaka chegypsum retarder chinowedzerwa. Zvakarurama, kana gypsum mortar shoma ichiwedzerwa, mvura yekuchengetedza mvura yakaderera, uye nguva yekuchengetedza mvura isingasviki maminitsi makumi manomwe, izvo zvinoita kuti pamusoro pe gypsum mortar irasikirwe nemvura nokukurumidza, pasi yakaoma, uye shrinkage. iyo gypsum mortar haina kuenderana. Panguva ino, gypsum mortar icharasikirwa nemvura. kutsemuka.
Maviri gypsum plaster kuumbwa anokurudzirwa pazasi:
1. inorema gypsum plaster mortar formula
Gypsum powder (nguva yekutanga yekuisa 5-6 maminitsi) - 300 kg
Jecha rakashambidzwa - 650 kg
Talc hupfu - 50 kg
Gypsum retarder - 0.8 kg
Cellulose ether HPMC(80,000-100,000 cps)—1.5kg
Thixotropic lubricant - 0.5 kg
Nguva yekushanda ndeye 60-70 maminetsi, mwero wekuchengetedza mvura i96%, uye chiyero chenyika chekuchengetedza mvura i75%
2 .lightweight gypsum plaster mortar formula
Gypsum powder (nguva yekutanga yekuisa 5-6 maminitsi) - 850 kg
Jecha rakashambidzwa - 100 kg
Talc hupfu - 50 kg
Gypsum retarder - 1.5 kg
Cellulose ether HPMC (40,000-60,000)—2.5 kg
Thixotropic lubricant - 1 kg
Vitrified beads - 1 cubic
Nguva yekutumira: Zvita-08-2022