N'ikwu okwu n'ozuzu, ka viscosity dị elu, ka mma njide mmiri nke gypsum mortar. Otú ọ dị, ka viscosity dị elu, ịdị elu nke cellulose ether dị elu, na mbelata kwekọrọ na ya ga-enwe mmetụta na-adịghị mma na ike na ịrụ ọrụ nke ngwa agha. Ihe dị elu nke viscosity, otú ahụ ka ọ na-apụta ìhè nke ọma mmetụta na ngwa ngwa, ma ọ bụghị kpọmkwem.
Ka viscosity dị elu, ka ngwa ngwa mmiri ga-adịkwu viscous. N'oge a na-ewu ihe, a na-egosipụta ya dị ka ịrapagidesi ike na scraper na elu adhesion na mkpụrụ. Mana ọ naghị enye aka ịbawanye ike nhazi nke ngwa agha mmiri n'onwe ya. Tụkwasị na nke ahụ, n'oge a na-ewu ihe, arụmọrụ mgbochi sag nke mmiri mmiri adịghị egosi. N'ụzọ megidere nke ahụ, ụfọdụ viscosity ọkara na obere viscosity mana methyl cellulose ethers gbanwere nwere ọmarịcha arụmọrụ n'ịkwalite ike nhazi nke ngwa agha mmiri.
Ihe ndị e ji arụ mgbidi ụlọ na-abụkarị ihe ndị nwere oghere, ha niile na-enwekwa mmịnye mmiri siri ike. Otú ọ dị, a na-akwadebe ihe eji arụ ọrụ gypsum na-arụ ọrụ mgbidi site n'ịgbakwụnye mmiri na mgbidi ahụ, a na-etinyekwa mmiri ahụ ngwa ngwa site na mgbidi ahụ, na-eme ka enweghi mmiri dị mkpa maka hydration nke gypsum, na-akpata ihe isi ike n'ịrụ mgbidi ma belata. ike nkekọ, na-ebute mgbawa, Nsogbu dị mma dị ka oghere na peeling. Ịkwalite njide mmiri nke ihe owuwu ụlọ gypsum nwere ike imeziwanye ihe owuwu ụlọ na ike njikọ na mgbidi. Ya mere, onye na-edobe mmiri aghọwo otu n'ime ihe ndị dị mkpa nke ihe eji arụ ụlọ gypsum.
A na-eji gypsum plastering, gypsum bonded, caulking gypsum, gypsum putty na ihe ndị ọzọ na-eme ntụ ntụ ụlọ. Iji mee ka owuwu dị mfe, a na-agbakwunye gypsum retarders n'oge mmepụta ka ogologo oge owuwu nke gypsum slurry dị ogologo. N'ihi na agwakọta gypsum na Retarder, nke na-egbochi usoro hydration nke gypsum hemihydrate. Ụdị gypsum slurry dị otú a kwesịrị ka edowe ya na mgbidi maka awa 1 ruo 2 tupu ya edowe. Ọtụtụ n'ime mgbidi ahụ nwere ihe ndị na-eme ka mmiri na-amịkọrọ mmiri, karịsịa mgbidi brik na ihe aerated. Mgbidi, bọọdụ mkpuchi mkpuchi na ihe ndị ọzọ dị arọ nke mgbidi ọhụrụ, ya mere, a ga-eme ọgwụgwọ njigide mmiri na gypsum slurry iji zere ịnyefe akụkụ nke mmiri na slurry na mgbidi, na-akpata ụkọ mmiri na hydration na-ezughị ezu mgbe gypsum. slurry na-esi ike. Mee ka nkewa na peeling nke nkwonkwo n'etiti gypsum na mgbidi elu. Ihe mgbakwunye nke onye na-ejigide mmiri bụ iji nọgide na-enwe mmiri dị na gypsum slurry, iji hụ na mmeghachi omume hydration nke gypsum slurry na interface, iji hụ na ike njikọ. Ndị na-ejigide mmiri na-ejikarị eme ihe bụ cellulose ethers, dị ka: methyl cellulose (MC), hydroxypropyl methyl cellulose (HPMC), hydroxyethyl methyl cellulose (HEMC), wdg Na mgbakwunye, polyvinyl mmanya, sodium alginate, gbanwetụrụ starch, diatomaceous ụwa. obere ntụ ntụ, wdg nwekwara ike iji kwalite ọrụ njide mmiri.
N'agbanyeghị ụdị onye na-ejigide mmiri nwere ike igbu oge hydration nke gypsum na ogo dị iche iche, mgbe ọnụ ọgụgụ nke retarder na-anọgide na-agbanweghị agbanwe, onye na-ejide mmiri nwere ike.
n'ozuzu retard ntọala maka 15-30 nkeji. Ya mere, ọnụ ọgụgụ nke retarder nwere ike belata nke ọma.
Oge nzipu: Nov-24-2022