Ngaphambi kokunquma inani le-gypsum retarder, kuyadingeka ukuhlola i-gypsum powder eluhlaza ethengiwe. Isibonelo, hlola isikhathi sokuqala nesokugcina sokusetha se-gypsum powder, ukusetshenziswa kwamanzi okujwayelekile (okungukuthi, ukungaguquguquki okujwayelekile), namandla okucindezela okuguquguqukayo. Uma kunokwenzeka, kungcono ukuhlola okuqukethwe kwamanzi e-II, i-semi-water kanye ne-anhydrous gypsum ku-gypsum powder. Okokuqala linganisa izinkomba ze-gypsum powder ngokunembile, bese unquma inani le-gypsum retarder ngokuvumelana nobude besikhathi sokuqala sokusetha se-gypsum powder, ingxenye ye-gypsum powder odakeni oludingekayo lwe-gypsum kanye nesikhathi sokusebenza esidingekayo ku-gypsum mortar.
Inani le-gypsum retarder lihlobene kakhulu ne-gypsum powder: uma isikhathi sokuqala sokusetha se-gypsum powder sifushane, inani le-retarder kufanele libe likhulu; uma isikhathi sokuqala sokusetha se-gypsum powder side, inani le-retarder kufanele libe lincane. Uma ingxenye ye-gypsum powder ku-gypsum mortar inkulu, i-retarder eyengeziwe kufanele yengezwe, futhi uma ingxenye ye-gypsum powder incane, isilinganiso se-gypsum powder kufanele sibe sincane. Uma isikhathi sokusebenza esidingekayo se-gypsum mortar side, i-retarder eyengeziwe kufanele yengezwe, ngaphandle kwalokho, uma isikhathi sokusebenza esidingekayo se-gypsum mortar sisifushane, i-retarder encane kufanele yengezwe. Uma isikhathi sokusebenza siside kakhulu ngemuva kokuthi i-gypsum mortar yengezwe nge-retarder, kuyadingeka ukunciphisa inani le-gypsum retarder. Uma isikhathi sokusebenza sisifushane, inani le-retarder kufanele lenyuswe. Akusho ukuthi ukungezwa kwe-gypsum retarder ku-static.
Ngemuva kokuthi i-gypsum ingene efektri, amasampula amaningi kufanele athathwe ukuze kuhlolwe izinkomba zayo ezihlukahlukene. Kungcono ukusampula nokuhlola njalo ezinsukwini ezimbalwa, ngoba ngesikhathi sokugcina se-gypsum powder, izinkomba zayo ezihlukahlukene nazo ziyashintsha. Into esobala kakhulu ukuthi ngemva kokuba i-gypsum powder igugile isikhathi esifanele, isikhathi sayo sokuqala nesokugcina sokusetha sizophinde sinwetshwe. Ngalesi sikhathi, inani le-gypsum retarder nalo lizoncishiswa, ngaphandle kwalokho isikhathi sokusebenza se-gypsum mortar sizokwandiswa kakhulu futhi sande. Yehlisa izindleko zokukhiqiza kuyilapho ithinta ukusebenza kwayo namandla okugcina.
Isibonelo, uma uthenga iqoqo le-phosphogypsum, isikhathi sokuqala sokumisa imizuzu engu-5-6, futhi ukukhiqizwa kodaka olunzima lwe-gypsum kanje:
I-Gypsum powder - 300 kg
Isihlabathi esihlanziwe - 650 kg
I-talc powder - 50 kg
I-Gypsum retarder - 0.8 kg
I-HPMC - 1.5 kg
Ekuqaleni kokukhiqizwa, i-0.8 kg ye-gypsum retarder yanezelwa, futhi isikhathi sokusebenza kwe-gypsum mortar kwakuyimizuzu engama-60-70. Kamuva, ngenxa yezizathu endaweni yokwakha, indawo yokwakha yavalwa futhi kwamiswa ukukhiqizwa, futhi leli qoqo lempushana ye-gypsum ligcinwe ukuze lingasetshenziswa. Lapho indawo yokwakha iqala kabusha ngoSepthemba, ukufakwa kwe-0.8 kg ye-retarder kwakusangezwa lapho udaka lwegypsum lukhiqizwa futhi. Udaka aluzange luhlolwe embonini, futhi namanje aluzange luqine ngemva kwamahora angu-24 luthunyelwe lapho kwakhiwa khona. Indawo yokwakha yasabela ngokuqinile. Selokhu umenzi angena kulo mkhakha esikhathini esingengakanani edlule, akasitholanga isizathu, futhi wayekhathazeke kakhulu. Ngalesi sikhathi, ngamenywa ukuba ngiye kumkhiqizi wodaka lwe-gypsum ukuze ngithole isizathu. Ngemva kokuya esinyathelweni sokuqala, isikhathi sokuqala sokusetha se-gypsum powder sihlolwe, futhi kwatholakala ukuthi isikhathi sokuqala sokusetha se-gypsum powder sanwetshwa kusukela esikhathini sokuqala sokuqala sokusetha imizuzu engu-5-6 kuya ngaphezu kwemizuzu engu-20, kanye nenani le-gypsum retarder alizange lincishiswe. , ngakho-ke kwenzeka lesi simo esingenhla. Ngemuva kokulungiswa, umthamo we-gypsum retarder wehliswa waba ngu-0.2 kg, futhi isikhathi sokusebenza kwe-gypsum mortar safinyezwa kumaminithi angu-60-70, okwanelisa indawo yokwakha.
Ngaphezu kwalokho, isilinganiso sezithasiselo ezihlukahlukene ku-gypsum mortar kufanele sibe nengqondo. Isibonelo, isikhathi sokusebenza kwe-gypsum mortar imizuzu engama-70, futhi inani elifanele le-gypsum retarder liyengezwa. Ngokunembile, uma i-gypsum mortar encane yengezwa, izinga lokugcinwa kwamanzi liphansi, futhi isikhathi sokugcina amanzi singaphansi kwemizuzu engu-70, okubangela ukuthi ingaphezulu le-gypsum mortar lilahlekelwe amanzi ngokushesha kakhulu, ingaphezulu lomile, futhi ukuncipha i-gypsum mortar ayihambisani. Ngalesi sikhathi, udaka lwe-gypsum luzolahlekelwa amanzi. ukuqhekeka.
Ukwakhiwa kwe-gypsum plaster emibili kunconywa ngezansi:
1. ifomula yodaka lwe-gypsum esindayo
I-Gypsum powder (isikhathi sokusetha sokuqala imizuzu engu-5-6) - 300 kg
Isihlabathi esigeziwe - 650 kg
I-talc powder - 50 kg
I-Gypsum retarder - 0.8 kg
I-Cellulose ether HPMC(80,000-100,000 cps)—1.5kg
I-lubricant Thixotropic - 0.5 kg
Isikhathi sokusebenza siyimizuzu engama-60-70, izinga lokugcinwa kwamanzi lingama-96%, kanti izinga likazwelonke lokugcina amanzi lingama-75%.
2 .ifomula yodaka lwe-gypsum engasindi
I-Gypsum powder (isikhathi sokuqala sokumisa imizuzu engu-5-6) - 850 kg
Isihlabathi esigeziwe - 100 kg
I-talc powder - 50 kg
I-Gypsum retarder - 1.5 kg
I-Cellulose ether HPMC (40,000-60,000)—2.5 kg
I-lubricant Thixotropic - 1 kg
I-Vitrified ubuhlalu - 1 cubic
Isikhathi sokuthumela: Dec-08-2022