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 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 yokubumba, i-gypsum ehlanganisiwe, i-caulking gypsum, i-gypsum putty nezinye izinto zokhuni ezakhiwe. Ukuze kusizakale ukwakhiwa, ama-gypsum retarders angezwa ngesikhathi sokukhiqiza ukuze andise isikhathi sokwakha se-gypsum slurry. Ngoba i-gypsum ixubene ne-retarder, evimbela inqubo ye-hydration ye-hemihydrate gypsum. Lolu hlobo lwe-gypsum slurry ludinga ukugcinwa odongeni amahora angu-1 kuye kwangama-2 ngaphambi kokusetha. 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 ajwayelekile asetshenziswa ngamanzi asetshenziswayo ama-cellulose afences, njenge: Methyl cellulose (MC), i-hpmpypropyl methyl celtule (hpmc), i-hpdroxypyll methyllulose (i-hpmc), i-polyvinylyl methy, njll.
Akunandaba noma hlobo luni lwe-ejenti yokugcina amanzi lungabambezela izinga le-hypsum ngamazinga ahlukahlukene, lapho inani le-retardarder lihlala lingashintshiwe, i-ejenti yokugcina amanzi ingabuyisa imingcele imizuzu engu-15-30. Ngakho-ke, inani le-retardder lingancishiswa ngokufanele.
Isikhathi sePosi: Feb-21-2025