Cellulose ether na morphology nke mmalite etringite

A mụrụ mmetụta nke hydroxyethyl methyl cellulose ether na methyl cellulose ether na morphology nke ettringite na mmalite ciment slurry site scanning eletrọn microscopy (SEM). Nsonaazụ na-egosi na ogologo dayameta ruru nke ettringite kristal na hydroxyethyl methyl cellulose ether gbanwetụrụ slurry dị obere karịa na nkịtị slurry, na morphology nke ettringite kristal dị mkpụmkpụ mkpara. Ogologo dayameta nke kristal ettringite dị na methyl cellulose ether gbanwetụrụ slurry karịrị nke ahụ na slurry nkịtị, na morphology nke kristal ettringite bụ mkpara agịga. Kristal ettringite dị na ciment slurries nkịtị nwere akụkụ akụkụ ebe dị n'etiti. Site na nyocha nnwale a dị n'elu, o doro anya na ọdịiche nke ịdị arọ molekụla nke ụdị cellulose ether abụọ bụ ihe kacha mkpa na-emetụta morphology nke ettringite.

Isi okwu:etringite; Ogologo dayameta nke ogologo; methyl cellulose ether; Hydroxyethyl methyl cellulose ether; morphology

Ettringite, dị ka ngwaahịa hydration na-agbasawanye ntakịrị, na-enwe mmetụta dị ukwuu na arụ ọrụ nke simenti, ma na-abụkarị ebe nyocha nke ihe ndị dabeere na ciment. Ettringite bụ ụdị trisulfide ụdị calcium aluminate hydrate, usoro kemịkal ya bụ [Ca3Al (OH) 6·12H2O] 2 · (SO4) 3 · 2H2O, ma ọ bụ enwere ike dee ya dị ka 3CaO · Al2O3 · 3CaSO4 · 32H2O, nke a na-akpọkarị AFt. . Na simenti Portland, ettringite na-etolite site na mmeghachi omume nke gypsum na aluminate ma ọ bụ ferric aluminate mineral, nke na-arụ ọrụ nke igbu oge hydration na ike mbụ nke ciment. Nhazi na morphology nke ettringite na-emetụta ọtụtụ ihe dị ka okpomọkụ, uru pH na ntinye ion. N'ihe dị ka 1976, Metha et al. eji scanning eletrọnịkị microscopy na-amụ banyere morphological e ji mara nke AFt, wee chọpụta na morphology nke ndị dị otú ahụ dịtụ gbasaa hydration ngwaahịa dịtụ iche mgbe uto ohere buru ibu na mgbe ohere dị oke. Nke mbụ na-abụkarị ndị dị gịrịgịrị n'ụdị agịga yiri mkpanaka, ebe nke ikpeazụ bụ prism dị mkpụmkpụ. Nnyocha nke Yang Wenyan chọpụtara na ụdị AFt dị iche na mpaghara ọgwụgwọ dị iche iche. Gburugburu mmiri dị mmiri ga-egbu oge ọgbọ AFt n'ime komnti na-agbasawanye ma na-abawanye ohere nke ọzịza na mgbawa. Mpaghara dị iche iche na-emetụta ọ bụghị naanị nhazi na microstructure nke AFt, kamakwa nkwụsi ike olu ya. Chen Huxing et al. chọpụtara na nkwụsi ike ogologo oge nke AFt belatara na mmụba nke ọdịnaya C3A. Clark na Monteiro et al. chọpụtara na na mmụba nke nrụgide gburugburu ebe obibi, AFt kristal Ọdịdị gbanwere site n'usoro gaa na ọgba aghara. Balonis na Glasser nyochara mgbanwe njupụta nke AFm na AFt. Renaudin et al. mụọ mgbanwe nhazi nke AFt tupu na mgbe imikpu ya na ngwọta yana usoro nhazi nke AFt na Raman spectrum. Kunther et al. mụọ mmetụta nke mmekọrịta dị n'etiti CSH gel calcium-silicon ratio na sulfate ion na AFt crystallization pressure site NMR. N'otu oge ahụ, dabere na ntinye nke AFt na ihe ndị dabeere na ciment, Wenk et al. mụọ AFt kristal orientation nke ihe ngalaba site hard synchrotron radieshon X-ray diffraction finishing technology. Achọpụtara nguzobe AFt na ciment agwakọta na ebe nyocha nke ettringite. Dabere na mmeghachi omume ettringite na-egbu oge, ụfọdụ ndị ọkà mmụta emeela ọtụtụ nyocha maka ihe kpatara AFt.

Mgbasawanye olu nke ettringite mere na-adị mma mgbe ụfọdụ, ọ pụkwara ime dị ka "mgbasawanye" dị ka magnesium oxide mgbasa ozi iji nọgide na-enwe nkwụsi ike nke ihe ndị dabeere na ciment. Mgbakwunye nke emulsion polymer na redispersible emulsion ntụ ntụ na-agbanwe ihe macroscopic nke ihe ndị dabeere na ciment n'ihi mmetụta ha dị ịrịba ama na microstructure nke ihe ndị dabeere na ciment. Otú ọ dị, n'adịghị ka redispersible emulsion ntụ ntụ nke tumadi enhances bonding onwunwe nke obi tara mmiri ngwa agha, na mmiri-soluble polymer cellulose ether (CE) na-enye ọhụrụ agwakọta ngwa agha mma mmiri na-ejigide na ndim mmetụta, si otú ahụ na-eme ka arụ ọrụ na-arụ ọrụ. A na-ejikarị CE ndị na-abụghị ionic, gụnyere methyl cellulose (MC), hydroxyethyl cellulose (HEC), hydroxypropyl methyl cellulose (HPMC),hydroxyethyl methyl cellulose (HEMC), wdg, na CE na-ekere òkè na ngwa ngwa agwakọta ọhụrụ mana ọ na-emetụtakwa usoro hydration nke ciment slurry. Nnyocha egosiwo na HEMC na-agbanwe ọnụọgụ AFt nke emepụtara dị ka ngwaahịa hydration. Otú ọ dị, ọ dịghị nnyocha e mere nke ọma tụnyere mmetụta nke CE na microscopic morphology nke AFt, ya mere akwụkwọ a na-enyocha ọdịiche nke mmetụta nke HEMC na MC na microscopic morphology nke ettringham na mmalite (1-ụbọchị) ciment slurry site na nyocha ihe oyiyi na ntụnyere.

1. Nnwale

1.1 Akụrụngwa

P·II 52.5R Portland simenti nke Anhui Conch Cement Co., ahọpụtara LTD dị ka ciment na nnwale. Abụọ cellulose ethers bụ hydroxyethyl methylcellulose (HEMC) na methylcellulose (methylcellulose, Shanghai Sinopath Group) n'otu n'otu. MC); Mmiri na-agwakọta bụ mmiri mgbata.

1.2 Ụzọ nnwale

Mmiri-ciment ruru nke simenti tapawa sample bụ 0.4 (oke oke nke mmiri na ciment), na ọdịnaya nke cellulose ether bụ 1% nke uka nke ciment. A na-eme nkwadebe nke ihe nlele ahụ dịka GB1346-2011 "Ule ule maka oriri mmiri, ịtọ oge na nkwụsi ike nke Cement Standard Consistency". Mgbe emechara ihe nlele ahụ, a na-etinye ihe nkiri plastik n'elu ihe a na-akpụ iji gbochie ikuku mmiri na carbonization, na etinyere ihe atụ ahụ n'ime ụlọ a na-agwọ ọrịa nke nwere okpomọkụ (20± 2) ℃ na iru mmiri nke (60 ± 5). ) %. Mgbe ụbọchị 1 gachara, a na-ewepụ ihe ndị ahụ, ma gbajie ihe atụ ahụ, mgbe ahụ, a na-ewepụ obere ihe nlele n'etiti ma tinye ya na ethanol anhydrous iji kwụsị hydration, wee wepụ ihe nlele ahụ ma kpoo tupu anwale ya. A na-ejikọta ihe nlele ndị ahụ a mịrị amị na tebụl nlele ya na nrapado nwere akụkụ abụọ na-eduzi, ma fesa oyi akwa ihe nkiri ọla edo n'elu site na Cressington 108auto auto ion sputtering ngwá. Oge ịgbasa bụ 20mA na oge ịgbasa bụ 60 s. FEI QUANTAFEG 650 Environment Scaning Electron Microscope (ESEM) ka ejiri wee hụ njirimara morphological nke AFt na ngalaba nlele. A na-eji ụdị eletrọn nke abụọ dị elu iji hụ AFT. The osooso voltaji bụ 15 kV, doo oghere dayameta bụ 3.0 nm, na-arụ ọrụ anya na-achịkwa ihe dị ka 10 mm.

2. Nsonaazụ na mkparịta ụka

Ihe oyiyi SEM nke ettringite na HEMC-modified cement slurry siri ike gosiri na ọganihu nke Layered Ca (OH) 2 (CH) pụtara ìhè, na AFt gosipụtara nchịkọta oge nke obere mkpanaka dị ka AFt, na ụfọdụ mkpirisi mkpara dị ka AFT kpuchie. na usoro akpụkpọ ahụ HEMC. Zhang Dongfang et al. Achọpụtakwara mkpịrị mkpụmkpụ dị ka AFt mgbe ị na-elele mgbanwe microstructure nke HEMC gbanwere ciment slurry site na ESEM. Ha kweere na nkịtị ciment slurry reacted ngwa ngwa mgbe ezute mmiri, otú AFt crystal dị gịrịgịrị, na ndọtị nke hydration afọ mere ka na-aga n'ihu na-abawanye nke ogologo-dayameta ruru. Otú ọ dị, HEMC mụbara viscosity nke ngwọta, belata ọnụ ọgụgụ nke ions na ngwọta na-egbu oge mbata nke mmiri n'elu clinker ahụ, otú ogologo-dayameta ruru nke AFt mụbara na-adịghị ike na-emekarị na ya morphological àgwà gosiri. mkpirisi osisi yiri udi. Tụnyere AFt na nkịtị ciment slurry nke otu afọ, a tiori ka egosipụtara n'ụzọ ụfọdụ, ma ọ bụghị na ọdabara ịkọwa morphological mgbanwe nke AFt na MC modified ciment slurry. Ihe onyonyo SEM nke ettridite n'ime ụbọchị 1 siri ike MC gbanwere ciment slurry gosikwara na uto nke Layered Ca (OH) 2, ekpuchikwara ụfọdụ ihe nkiri AFt na usoro ihe nkiri nke MC, yana AFt gosipụtara njirimara morphological nke uto ụyọkọ. Agbanyeghị, site na ntụnyere, AFt crystal in MC modified cement slurry nwere oke dayameta dị ogologo yana morphology dị gịrịgịrị karịa, na-egosi morphology acicular na-ahụkarị.

Ma HEMC na MC na-egbu oge mmalite hydration usoro nke ciment ma mụbaa viscosity nke ngwọta, ma ọdịiche dị na AFt morphological àgwà nke ha kpatara ka dị ịrịba ama. Enwere ike ịkọwapụta ihe ndị a dị n'elu site n'echiche nke usoro ihe omimi nke cellulose ether na AFt crystal Ọdịdị. Renaudin et al. tinye AFt synthesized na ngwọta alkali a kwadebere iji nweta "mmiri AFt", ma wepụ ya n'otu akụkụ ma kpoo ya n'elu ngwọta CaCl2 jupụtara (35% iru mmiri iru mmiri) iji nweta "akọrọ AFt". Mgbe nhazi nhazi ihe owuwu site na Raman spectroscopy na X-ray powder diffraction, a chọpụtara na ọ dịghị ihe dị iche n'etiti ihe owuwu abụọ ahụ, naanị ntụziaka nke nhazi kristal nke mkpụrụ ndụ gbanwere na usoro ihicha, ya bụ, na usoro nke gburugburu ebe obibi. na-agbanwe site na "mmiri" gaa na "akọrọ", kristal AFt kpụrụ sel n'akụkụ ntụziaka nkịtị nke ji nwayọọ nwayọọ na-abawanye. Kristal AFt n'akụkụ c nkịtị direction ghọrọ obere na obere. The kasị isi unit nke atọ akụkụ oghere mejupụtara a nkịtị ahịrị, b nkịtị akara na c nkịtị ahịrị bụ perpendicular ọ bụla ọzọ. Ọ bụrụ na edobere b normals, kristal AFt na-agbakọta n'akụkụ ihe nkịtị, na-ebute ngalaba cross cell gbasaa n'ime ụgbọ elu nke ab normals. Ya mere, ọ bụrụ na HEMC "na-echekwa" mmiri karịa MC, ebe "akọrọ" nwere ike ime na mpaghara mpaghara, na-agba ume nchịkọta mpụta na uto nke kristal AFt. Patural et al. chọpụtara na maka CE n'onwe ya, ka ogo nke polymerization dị elu (ma ọ bụ ibu ibu molekụla), ka viscosity CE ka ukwuu ma na-arụ ọrụ njigide mmiri ka mma. Ọdịdị molekụla nke HEMCs na MCS na-akwado echiche a, na otu hydroxyethyl nwere nnukwu ibu molekụla karịa otu hydrogen.

N'ozuzu, kristal AFt ga-etolite ma na-asọpụta naanị mgbe ion dị mkpa ruru ụfọdụ saturation na usoro ngwọta. Ya mere, ihe ndị dị ka ion ntinye uche, okpomọkụ, pH uru na e guzobere oghere na mmeghachi omume ngwọta nwere ike imetụta morphology nke AFt kristal, na mgbanwe na artificial synthesis ọnọdụ nwere ike ịgbanwe morphology nke AFt kristal. Ya mere, ruru nke AFt kristal na nkịtị ciment slurry n'etiti abụọ nwere ike mere site na otu ihe nke mmiri oriri na mmalite hydration nke ciment. Otú ọ dị, ọdịiche dị na AFt crystal morphology mere site na HEMC na MC kwesịrị ịbụ nke kachasị n'ihi na ha na-ejigide mmiri pụrụ iche. Hemcs na MCS na-emepụta ụgbọ mmiri "mechiri emechi" n'ime microzone nke cement slurry ọhụrụ, na-enye ohere maka "obere oge" nke mmiri "dị mfe ịbanye na siri ike ịpụ." Agbanyeghị, n'ime oge a, a na-agbanwekwa gburugburu ebe mmiri mmiri dị na na nso microzone. Ihe ndị dị ka ntinye uche ion, pH, wdg, Mgbanwe nke gburugburu ebe obibi na-eto eto na-egosipụtakwa na ọdịdị ọdịdị nke kristal AFt. Nke a "mechiri emechi" nke njem mmiri yiri usoro ihe omume nke Pourchez et al kọwara. HPMC na-ekere òkè na njide mmiri.

3. Nkwubi okwu

(1) Na mgbakwunye na nke hydroxyethyl methyl cellulose ether (HEMC) na methyl cellulose ether (MC) nwere ike budata ịgbanwe morphology nke ettringite n'oge (1 ụbọchị) nkịtị ciment slurry.

(2) Ogologo na dayameta nke kristal ettringite na HEMC gbanwere ciment slurry bụ obere mkpanaka na mkpụmkpụ; Ogologo na dayameta ruru nke kristal ettringite na MC gbanwere ciment slurry buru ibu, nke bụ ụdị mkpara agịga. Kristal ettringite dị na ciment slurries nkịtị nwere akụkụ dị n'etiti abụọ ndị a.

(3) Mmetụta dị iche iche nke abụọ cellulose ethers na morphology nke ettringite bụ n'ezie n'ihi ọdịiche dị na arọ molecular.