Simenti bụ otu n'ime ihe ndị a na-ejikarị eme ihe n'ubi a na-ewu ụlọ, na ịrụ ọrụ nke ciment bụ ihe dị mkpa na-emetụta mmetụta ihe owuwu ya, usoro na nhazi nhazi ikpeazụ. Iji mee ka ọrụ ciment dịkwuo mma, a na-etinyekarị admixtures dị iche iche na ciment. N'etiti ha,hydroxypropyl methylcellulose (HPMC), dị ka ngwakọta ciment a na-ejikarị eme ihe, na-arụ ọrụ dị mkpa.
(1) Ihe ndị bụ isi nke HPMC
HPMC (Hydroxypropyl Methylcellulose)bụ ihe na-eme ka mmiri na-eme ka mmiri ghara ịdị ike, a na-ejikarị arụ ọrụ, ihe mkpuchi, ọgwụ, nri na ụlọ ọrụ ndị ọzọ. Na simenti, a na-ejikarị HPMC eme ihe dị ka onye na-ekpo ọkụ, onye na-ejigide mmiri na rheology modifier iji meziwanye mmiri nke ciment slurry, na-egbu oge mmalite nke ciment ma melite ọrụ ciment. Site n'usoro ihe omimi ya pụrụ iche, HPMC nwere ike iji mkpụrụ ndụ mmiri na ihe siri ike na-emekọrịta ihe na ciment slurry, si otú ahụ na-eme ka ọrụ ciment dịkwuo mma.
(2) Mmetụta nke HPMC na ciment processability
Ịrụ ọrụ nke ciment na-agụnye ọtụtụ akụkụ, nke kachasị mkpa bụ ihe na-eme ka mmiri na-arụ ọrụ, ductility na ịrụ ọrụ nke cement slurry n'oge a na-ewu ụlọ. HPMC nwere ike melite arụmọrụ ciment n'ọtụtụ akụkụ.
1. Meziwanye mmiri nke ciment slurry
Mmiri mmiri nke ciment na-ezo aka n'ikike nke ciment mado na-asọ asọ n'oge a na-ewu ya. Simenti slurry na mmiri na-adịghị mma ga-eme ka nsogbu dị ka ihe isi ike na ngwakọta na ngwa na-adịghị mma n'oge a na-ewu ụlọ, nke ga-emetụta arụmọrụ na mmetụta. HPMC nwere magburu onwe ndim Njirimara na ike n'ụzọ dị irè dịkwuo viscosity nke ciment slurry. Ọdịdị yinye molekụla ya nwere ike iji ụmụ irighiri mmiri na irighiri ciment na-emekọrịta ihe iji mepụta usoro netwọkụ viscous nke ukwuu, si otú ahụ na-eme ka mmiri dị na slurry dịkwuo mma.
Site n'ịgbanwe ego nke HPMC agbakwunyere, a na-achịkwa mmiri nke ciment slurry nke ọma, nke nwere ike ọ bụghị nanị na-eme ka mmiri dịkwuo mma, kamakwa zere nkewa slurry na nhazi nke kpatara oke mmiri. Ya mere, iji HPMC nwere ike inye aka nweta slurry kwụsiri ike na otu n'oge a na-arụ ciment, si otú a na-ahụ na ịdị mma ụlọ.
2. Igbu oge mmalite nke ciment
Oge ntọala mbụ nke ciment na-ezo aka n'oge ciment na-amalite ịgbasi ike. Ọ bụrụ na oge nhazi mbụ dị mkpụmkpụ, ọ ga-eme ka ciment siri ike ịrụ ọrụ n'oge usoro ihe owuwu ma na-emetụta àgwà ụlọ; ọ bụrụ na oge ntọala mbụ dị ogologo, ọ nwere ike ime ka mmiri na-efunahụ na ike mbelata nke ciment slurry. Dị ka onye na-ebu ibu na onye na-ejigide mmiri, HPMC nwere ike igbu oge usoro hydration nke ciment site na ijikọta ya na mmiri dị na ciment slurry, si otú ahụ na-agbatị oge nhazi mbụ nke ọma. Site n'ịchịkwa ego nke HPMC agbakwunyere, enwere ike ịhazi oge ntọala mbụ nke ciment slurry nke ọma iji hụ na ciment na-arụ ọrụ zuru oke n'oge usoro ihe owuwu.
3. Meziwanye njigide mmiri nke ciment
Cement kwesịrị ịnọgide na-enwe ụfọdụ mmiri mmiri n'oge usoro ihe owuwu iji hụ na ọganihu dị mma nke mmeghachi omume hydration ya. Mgbe njide mmiri nke ciment na-adịghị mma, mmiri ahụ ga-apụ ngwa ngwa, na-eduga ná nsogbu ndị dị ka mgbawa na ike belata nke ciment mado. Dị ka ihe na-emepụta polymer, HPMC nwere ike ịmepụta usoro netwọk "hydrogel" dị na ciment slurry iji dozie mmiri dị na slurry, si otú ahụ na-eme ka njide mmiri nke ciment dịkwuo mma. Ọ bụ ezie na a na-eme ka njide mmiri dị mma, slurry ciment na-akwụsi ike n'oge usoro ihe owuwu, na-ebelata ihe omume nke ciment shrinkage, cracks na nsogbu ndị ọzọ.
4. Meziwanye rheology nke ciment mado
Rheology na-ezo aka n'àgwà nke ihe na-emebi n'okpuru nrụgide, na-emekarị na-agụnye viscosity, fluidity, wdg Na ciment slurries, ezigbo rheological Njirimara na-enyere aka melite arụmọrụ nke ciment slurries.HPMCna-agbanwe rheological Njirimara nke ciment slurry nke mere na slurry nwere mma fluidity na ala eruba iguzogide. Nke a ọ bụghị nanị na-enyere aka melite workability na mkpuchi mmetụta nke ciment, ma na-enyere aka ibelata akụrụngwa na-efunahụ kpatara oke viscosity nke slurry n'oge a na-ewu usoro.
5. Meziwanye nkwụsị mgbape nke ciment
Mgbakwunye nke HPMC nwere ike imeziwanye ike njikọ na mgbawa nguzogide nke ciment. Mgbe simenti slurry na-esi ike, usoro fibrous nke HPMC hibere nwere ike ibelata mgbawa nke ihe ndị dị ka ihicha shrinkage na mgbanwe okpomọkụ na ciment ruo n'ókè ụfọdụ, si otú ahụ na-eme ka nkwụsị nke ciment dịkwuo mma. Karịsịa mgbe a na-ewu na gburugburu mgbagwoju anya dị ka okpomọkụ dị elu na iru mmiri dị elu, iji HPMC eme ihe nwere ike ibelata ihe omume nke cracks, si otú ahụ na-emeziwanye ogo nke nhazi ahụ.
(3) Ihe atụ ngwa nke HPMC na ciment
Ngwa ngwa akọrọ: A na-eji HPMC eme ihe na ngwa ngwa akọrọ. Ọ nwere ike imeziwanye arụmọrụ nke ngwa agha ahụ nke ọma, na-abawanye njide mmiri ma gbuo oge ntọala mbụ. N'ihe eji ewu ụlọ dị ka mkpuchi mgbidi dị n'èzí, ihe nkedo tile, na plasta, ọnụ ọgụgụ nke HPMC agbakwunyere na-abụkarị n'etiti 0.1% na 0.3%. Ọ nwere ike hụ na ngwa agha ahụ adịghị mfe nkụ n'oge a na-ewu ụlọ ma na-eme ka ọ dị mma.
Simenti na-edozi onwe ya: Simenti na-edozi onwe ya bụ ihe simenti nwere ezigbo mmiri na-ejuputa ihe. A na-ejikarị ya eme ihe na nhazi ala, nrụzi na ọrụ ndị ọzọ. Dị ka a thickener na mmiri-eji-elekọta mmadụ, HPMC nwere ike imeziwanye rheology nke onwe-leveling ciment, na-eme ka ọ dị mfe ịrụ ọrụ na ọzọ edo n'oge ewu.
Ndozi ciment: N'etiti ihe nrụzi ciment, HPMC nwere ike imeziwanye nkwụsi ike na nkwụsi ike nke ihe ahụ, gbochie ihe ahụ site na ihicha ngwa ngwa ma mee ka arụ ọrụ nke ihe ndozi ahụ dịkwuo elu.
Dị ka ihe dị mkpa ciment admixture, HPMC budata mma workability nke ciment na enhances ewu arụmọrụ na oru ngo àgwà site otutu ọrụ dị ka ndim, mmiri njide, na retardation nke ntọala. Ngwa ya na tapawa ciment ọ bụghị naanị na-eme ka mmiri dịkwuo mma ma na-agbatị oge nhazi mbụ, ma na-eme ka njide mmiri dịkwuo mma, nkwụsị mgbawa na njirimara rheological. Ka ụlọ ọrụ na-ewu ụlọ na-aga n'ihu na-emeziwanye ihe ọ chọrọ maka ịrụ ọrụ na ịrụ ọrụ nke ọma, HPMC, dị ka ihe mgbakwunye akụ na ụba na gburugburu ebe obibi, ga-eji ciment na ihe ndị ọzọ arụ ọrụ.
Oge nzipu: Nov-08-2024