I-Viscosity iyipharamitha ebalulekile yokusebenza kwe-cellulose ether.
Ngokuvamile, okuphezulu kwe-viscosity, kungcono umphumela wokugcina amanzi we-gypsum udaka. Kodwa-ke, ukukhuphuka kwesisindo esiphakeme, isisindo samangqamuzana e-cellulose ether, kanye nokuncipha okuhambisanayo kwe-solubelity yayo kuzoba nomthelela ongemuhle emandleni nasekusebenzeni komuzi wodaka. Lapho kuphakama i-viscosity, kusobala kakhulu umphumela wokuqina kudaka, kepha akayona ngokuqondile.
Lapho esekhuphuka khona ukubonwa, okuzoba khona ngodaka olumanzi. Ngesikhathi sokwakha, kubonakaliswa njengokunamathela ku-scraper kanye nokunamathela okuphezulu kuya engxenyeni engezansi. Kepha akusizi okuningi ukwandisa amandla wesakhiwo sodaka olumanzi uqobo. Ngaphezu kwalokho, ngesikhathi sokwakha, ukusebenza kwe-anti-sag ngodaka olumanzi akubonakali. Ngokuphambene nalokho, ukubonakala okuphakathi nendawo okuphansi kepha okulungiselelwe i-methyl cellulose kanye nokusebenza okuhle kakhulu ekuthuthukiseni amandla wesakhiwo sodaka lwamanzi.
Ukwakha izinsiza zodonga kakhulu izinhlaka ze-porous, futhi bonke banomunwe oqinile wamanzi. Kodwa-ke, izinto zokwakha ze-gypsum ezisetshenziselwa ukwakhiwa kodonga zilungiselelwe ngokungeza amanzi odongeni, futhi amanzi adonswa kalula ngodonga, okuholela ekunciphiseni kokwakhiwa kwamanzi, okuholela ekuqhekekeni kwamandla ebhondi, okuholela ekuqhekekeni kwamandla, okuholela. Ukwenza ngcono ukugcinwa kwamanzi kwezinto zokwakha ze-gypsum kungathuthukisa ikhwalithi yokwakha namandla abopha ngodonga. Ngakho-ke, i-ejenti yokugcina amanzi isibe ngenye ye-admixtures ebalulekile yezinto zokwakha ze-gypsum.
I-gypsum elungisayo, i-gypsum ehlanganisiwe, i-caulking gypsum, i-gypsum putty nezinye izinto zokwakha zokwakha ziyasetshenziswa. Ukuze kusizakale ukwakhiwa, ama-gypsum retarders angezwa ngesikhathi sokukhiqiza ukuze andise isikhathi sokwakha se-gypsum slurry. Njengoba i-gypsum ixubene ne-retarder, evimbela inqubo ye-hydration ye-hemihydrate gypsum. Lolu hlobo lwe-gypsum slurry ludinga ukugcinwa odongeni lwe-1 ~ 2h ngaphambi kokuba lihle. Iningi lezindonga linezindawo zokutholwa kwamanzi, ikakhulukazi izindonga zezitini nokhonkolo olwenziwe. Udonga, ibhodi yokufakwa kwe-POROS nezinye izinto zodonga olusha olungasindi, ngakho-ke ukwelashwa kokugcinwa kwamanzi kufanele kwenziwe ku-gypsum slurry ukugwema ukudluliswa kwengxenye yamanzi ku-Wlurry odongeni, okuholela ekutheni i-hydration yamanzi kanye ne-gypsum slurry ilukhuni. Dala ukwahlukana nokukhonkotha kokuhlanganiswa phakathi kwe-gypsum ne-wall ebusweni. Ukungezwa kwe-ejenti yokugcina amanzi kuwukugcina umswakama oqukethwe ku-gypsum slurry, ukuqinisekisa ukusabela kwe-hydration kwe-gypsum slurry esibonakalayo, ukuze kuqinisekiswe amandla okubopha. Ama-ejenti agciniwe asetshenziswa amanzi asetshenziswa ama-cellulose ageins, njenge-methylsprose (MC), i-hpmpypropyl methyl cellulose (hpmc), i-hpdroxypyll methyllulose (i-hpmc), i-polyvinyl allow, njll.
Akunandaba noma luhlobo luni lwe-ejenti yokugcina amanzi lungabambezela izinga le-hypsum kuma-degree ahlukahlukene, lapho umthamo walowo mkhosi uhlala ungashintshiwe, umenzeli wokugcina amanzi ngokuvamile angabuyisa ukumiswa kwemizuzu engu-15-30. Ngakho-ke, inani le-retardder lingancishiswa ngokufanele.
Isikhathi sePosi: FEB-08-2023