Cellulose ether na ọdịdị nke ettringite mbụ

A mụrụ mmetụta nke hydroxyethyl methyl cellulose ether na methyl cellulose ether na nhazi nke ettringite na mmalite simenti slurry site na iji nyocha electron microscopy (SEM). Nsonaazụ ya na-egosi na oke ogologo-dayameta nke kristal ettringite na hydroxyethyl methyl cellulose ether modified slurry pere mpe karịa nke na hydroxyethyl methyl cellulose ether modified slurry pere mpe karịa nke na hydroxyethyl methyl cellulose ether modified slurry dị mkpụmkpụ dị ka mkpanaka. Oke ogologo-dayameta nke kristal ettringite na methyl cellulose ether modified slurry buru ibu karịa nke na methyl cellulose ether modified slurry buru ibu karịa nke na methyl cellulose ether modified slurry, ọdịdị nke kristal ettringite bụkwa mkpara agịga. Kristal ettringite na slọrị simenti nkịtị nwere oke akụkụ n'etiti. Site na ọmụmụ nnwale dị n'elu, o doro anya na ọdịiche nke ibu molekul nke ụdị cellulose ether abụọ bụ ihe kachasị mkpa na-emetụta nhazi nke ettringite.

Okwu ndị dị mkpa:ettringite; Oke ogologo-dayameta; Methyl cellulose ether; Hydroxyethyl methyl cellulose ether; morphology

Ettringite, dịka ngwaahịa mmiri ọkụ gbasaa ntakịrị, nwere mmetụta dị ukwuu na arụmọrụ nke simenti simenti, ọ bụkwa ebe a na-eme nnyocha maka ihe ndị e ji simenti mee. Ettringite bụ ụdị trisulfide calcium aluminate hydrate, usoro kemịkalụ ya bụ [Ca3Al (OH)6·12H2O]2·(SO4)3·2H2O, ma ọ bụ enwere ike ide ya dị ka 3CaO·Al2O3·3CaSO4·32H2O, nke a na-akpọkarị AFt. Na sistemụ simenti Portland, ettringite na-etolitekarị site na mmeghachi omume nke gypsum na mineral aluminate ma ọ bụ ferric aluminate, nke na-arụ ọrụ nke igbu oge mmiri na ike mbụ nke simenti. Ọtụtụ ihe dịka okpomọkụ, uru pH na ntinye ion na-emetụta nhazi na ọdịdị nke ettringite. Na mbido 1976, Metha et al. jiri igwe nyocha elektrọn iji mụọ njirimara ọdịdị nke AFt, wee chọpụta na ọdịdị nke ngwaahịa mmiri dị otú ahụ gbasaara ntakịrị dịtụ iche mgbe oghere uto buru ibu na mgbe oghere ahụ pere mpe. Nke mbụ bụ spherules dị gịrịgịrị nke dị ka agịga, ebe nke ikpeazụ bụ prism dị mkpụmkpụ nke dị ka mkpanaka. Nnyocha Yang Wenyan chọpụtara na ụdị AFt dị iche na gburugburu ebe dị iche iche na-agwọ ọrịa. Gburugburu mmiri ga-egbu oge mmepụta AFt na simenti gbasaa ma mee ka ohere nke ọzịza na mgbawa simenti dịkwuo elu. Gburugburu dị iche iche na-emetụta ọ bụghị naanị nhazi na obere nhazi nke AFt, kamakwa nkwụsi ike olu ya. Chen Huxing na ndị otu ya chọpụtara na nkwụsi ike ogologo oge nke AFt belatara ka mmụba nke ọdịnaya C3A. Clark na Monteiro na ndị otu ya chọpụtara na ka nrụgide gburugburu ebe obibi na-abawanye, nhazi kristal AFt gbanwere site n'usoro gaa na nsogbu. Balonis na Glasser nyochachara mgbanwe njupụta nke AFm na AFt. Renaudin na ndị otu ya mụrụ mgbanwe nhazi nke AFt tupu na mgbe e mikpuru na ngwọta na paramita nhazi nke AFt na Raman spectrum. Kunther na ndị otu ya mụọ mmetụta nke mmekọrịta dị n'etiti oke CSH gel calcium-silicon na sulfate ion na nrụgide kristal AFt site na NMR. N'otu oge ahụ, dabere na itinye AFt na ihe ndị dabere na simenti, Wenk na ndị otu ya mụrụ ntụzịaka kristal AFt nke akụkụ simenti site na teknụzụ X-ray diffraction siri ike. E nyochachara nhazi AFt na simenti agwakọtara na ebe nchọpụta nke ettringite. Dabere na mmeghachi omume ettringite na-egbu oge, ụfọdụ ndị ọkà mmụta emeela ọtụtụ nnyocha na ihe kpatara AFt phase.

Mgbasawanye olu nke ettringite kpatara na-adị mma mgbe ụfọdụ, ọ nwekwara ike ịrụ ọrụ dị ka "mgbasawanye" yiri ihe na-eme ka magnesium oxide gbasaa iji nọgide na-enwe nkwụsi ike nke ihe ndị e ji simenti mee. Mgbakwunye nke polymer emulsion na ntụ ntụ emulsion redispersible na-agbanwe ihe onwunwe macroscopic nke ihe ndị e ji simenti mee n'ihi mmetụta dị ukwuu ha nwere na obere nhazi nke ihe ndị e ji simenti mee. Agbanyeghị, n'adịghị ka ntụ ntụ emulsion redispersible nke na-eme ka njikọ nke moto siri ike dịkwuo mma, polymer cellulose ether nke na-agbaze mmiri (CE) na-enye moto agwakọtara ọhụrụ ahụ ezigbo njigide mmiri na mmetụta siri ike, si otú a na-eme ka arụmọrụ ọrụ ka mma. A na-ejikarị CE na-abụghị ionic eme ihe, gụnyere methyl cellulose (MC), hydroxyethyl cellulose (HEC), hydroxypropyl methyl cellulose (HPMC),hydroxyethyl methyl cellulose (HEMC), wdg., na CE na-arụ ọrụ na ngwa agha agwakọtara ọhụrụ mana ọ na-emetụtakwa usoro mmiri nke simenti slurry. Ọmụmụ ihe egosila na HEMC na-agbanwe ọnụọgụ AFt emepụtara dị ka ngwaahịa mmiri. Agbanyeghị, ọ dịghị ọmụmụ ihe ọ bụla ejirila mmetụta CE tụnyere ọdịdị obere nke AFt n'usoro, yabụ akwụkwọ a na-enyocha ọdịiche dị n'etiti mmetụta HEMC na MC na ọdịdị obere nke ettringham na mbido (ụbọchị 1) simenti slurry site na nyocha onyonyo na ntụnyere.

1. Nnwale

1.1 Ihe Ndị E Ji Arụ Ọrụ

A họọrọ simenti P·II 52.5R Portland nke Anhui Conch Cement Co., LTD mepụtara dị ka simenti na nnwale ahụ. Ether cellulose abụọ ahụ bụ hydroxyethyl methylcellulose (HEMC) na methylcellulose (methylcellulose, Shanghai Sinopath Group) n'otu n'otu. MC); Mmiri ngwakọta bụ mmiri ọkpọkọ.

1.2 Ụzọ nnwale

Oke mmiri na simenti nke ihe nlele simenti bụ 0.4 (oke oke mmiri na simenti), ọdịnaya nke cellulose ether bụkwa 1% nke oke simenti. Emere nkwadebe nke ihe nlele ahụ dịka GB1346-2011 si kwuo "Usoro Nnwale maka Iri Mmiri, Oge Isetịpụ na Nkwụsi Ike nke Nkwekọ Simenti". Mgbe e mechara ihe nlele ahụ, e tinyere ihe nkiri plastik n'elu ebu ahụ iji gbochie ikuku mmiri na kabonation, e tinyekwara ihe nlele ahụ n'ime ụlọ na-agwọ ọrịa nke nwere okpomọkụ nke (20±2)℃ na iru mmiri dị n'etiti (60±5)%. Mgbe otu ụbọchị gachara, ewepụrụ ihe nlereanya ahụ, a gbajiri ihe nlereanya ahụ, e wee wepụta obere ihe nlele ahụ site n'etiti wee mikpuo ya na ethanol na-anaghị amịpụta mmiri iji kwụsị mmiri, e wee wepụta ihe nlele ahụ ma kpọọ nkụ tupu e nwalee ya. E jiri ihe mgbakwunye nwere akụkụ abụọ na-eduzi ihe nlele ahụ mado ihe nkiri ọlaedo n'elu ya, e fesakwara ihe mkpuchi ion akpaka nke Cressington 108auto. Ọkụ ịgbasa ọkụ ahụ bụ 20 mA, oge ịgbasa ọkụ ahụ bụ 60 sekọnd. E jiri FEI QUANTAFEG 650 Environmental Scanning electron Microscope (ESEM) hụ njirimara morphological nke AFt na ngalaba ihe nlele ahụ. E jiri ụdị elektrọn nke abụọ nke vacuum dị elu hụ AFT. Voltaji ngwa ngwa ahụ bụ 15 kV, dayameta ntụpọ ọkụ ahụ bụ 3.0 nm, a na-achịkwa anya ọrụ ihe dị ka 10 mm.

2. Nsonaazụ na mkparịta ụka

Foto SEM nke ettringite na slurry simenti HEMC siri ike gosiri na uto nhazi nke Ca (OH)2(CH) dị larịị pụtara ìhè, AFt gosikwara mkpokọta mkpụmkpụ dị ka AFt, e jikwa usoro HEMC membrane kpuchie ụfọdụ mkpanaka dị mkpụmkpụ dị ka AFT. Zhang Dongfang na ndị otu ya hụkwara AFt dị mkpụmkpụ dị ka mkpanaka mgbe ha na-ahụ mgbanwe microstructure nke simenti HEMC gbanwere site na ESEM. Ha kwenyere na simenti nkịtị na-emeghachi omume ngwa ngwa mgbe ha zutere mmiri, yabụ kristal AFt dị gịrịgịrị, ịgbatị afọ mmiri wee duga na mmụba na-aga n'ihu nke oke dayameta-ogologo. Agbanyeghị, HEMC mụbara viscosity nke ngwọta ahụ, belata ọnụego njikọ nke ion na ngwọta ahụ ma gbuo oge ọbịbịa mmiri n'elu ihe ndị clinker, yabụ oke dayameta-ogologo nke AFt mụbara n'usoro adịghị ike na njirimara morphological ya gosipụtara ọdịdị mkpanaka dị mkpụmkpụ. Ma e jiri ya tụnyere AFt na slurry simenti nkịtị nke otu afọ ahụ, ekwenyela na echiche a n'ụzọ ụfọdụ, mana ọ baghị uru ịkọwa mgbanwe morphological nke AFt na slurry simenti MC gbanwere. Foto SEM nke ettridite n'ime slurry simenti MC nke gbanwere n'otu ụbọchị gosikwara uto nke Ca(OH)2 dị larịị, e kpuchikwara ụfọdụ elu AFt na nhazi ihe nkiri nke MC, AFt gosikwara njirimara morphological nke uto cluster. Agbanyeghị, site na ntụnyere, kristal AFt na slurry simenti MC agbanweela nwere oke ogologo-dayameta buru ibu na morphology dị gịrịgịrị karịa, na-egosi ọdịdị acicular nkịtị.

Ma HEMC na MC gbutere usoro mmiri mmiri mbụ nke simenti ma mụbaa viscosity nke ngwọta ahụ, mana ọdịiche dị na njirimara morphological nke AFt kpatara ka dị mkpa. Enwere ike ịkọwa ihe ndị a dị n'elu site n'echiche nke nhazi molekul nke cellulose ether na nhazi kristal AFt. Renaudin et al. mikpuru AFt a na-emepụta na ngwọta alkali akwadoro iji nweta "AFt mmiri mmiri", wee wepụ ya akụkụ ma kpọọ ya nkụ n'elu ngwọta CaCl2 juru eju (35% iru mmiri dị nso) iji nweta "AFt akọrọ". Mgbe ọmụmụ nhazi nke Raman spectroscopy na mgbasa ntụ ntụ X-ray gasịrị, achọpụtara na ọ dịghị ihe dị iche n'etiti nhazi abụọ ahụ, naanị ntụziaka nke nhazi kristal nke mkpụrụ ndụ gbanwere na usoro nkụ, ya bụ, na usoro mgbanwe gburugburu ebe obibi site na "mmiri mmiri" gaa na "akọrọ", kristal AFt mepụtara mkpụrụ ndụ n'akụkụ ntụziaka nkịtị nke mmụba nwayọọ nwayọọ. Kristal AFt n'akụkụ ntụziaka nkịtị c ghọrọ obere na obere. Ngalaba kachasị mkpa nke oghere atọ nwere ahịrị nkịtị, b ahịrị nkịtị na c ahịrị nkịtị nke dị n'akụkụ ibe ha. Ọ bụrụ na e doziri b normals, kristal AFt gbakọtara n'akụkụ normals, na-eme ka akụkụ mkpụrụ ndụ buru ibu n'ime oghere ab normals. Ya mere, ọ bụrụ na HEMC "echekwa" mmiri karịa MC, gburugburu "akọrọ" nwere ike ime na mpaghara mpaghara, na-agba ume nchịkọta n'akụkụ na uto nke kristal AFt. Patural et al. chọpụtara na maka CE n'onwe ya, ka ogo polymerization dị elu (ma ọ bụ ibu molecular buru ibu), ka viscosity nke CE na-abawanye ma ka arụmọrụ njigide mmiri ka mma. Nhazi molecular nke HEMCs na MCS na-akwado echiche a, ebe otu hydroxyethyl nwere ibu molecular buru ibu karịa otu hydrogen.

N'ozuzu, kristal AFt ga-etolite ma na-amịpụta naanị mgbe ion ndị dị mkpa ruru njupụta ụfọdụ na sistemụ ngwọta. Ya mere, ihe ndị dị ka ntinye ion, okpomọkụ, uru pH na oghere nhazi na ngwọta mmeghachi omume nwere ike imetụta ọdịdị nke kristal AFt nke ukwuu, mgbanwe na ọnọdụ mmepụta ihe arụrụ arụ nwere ike ịgbanwe ọdịdị nke kristal AFt. Ya mere, oke nke kristal AFt na slurry simenti nkịtị n'etiti abụọ ahụ nwere ike ịbụ site na otu ihe na-eri mmiri na mmiri mbụ nke simenti. Agbanyeghị, ọdịiche dị na ọdịdị kristal AFt nke HEMC na MC kpatara kwesịrị ịbụ n'ihi usoro nchekwa mmiri pụrụ iche ha. Hemcs na MCS na-emepụta "akara mechiri emechi" nke njem mmiri n'ime mpaghara microzone nke slurry simenti ọhụrụ, na-enye ohere maka "oge dị mkpirikpi" ebe mmiri "dị mfe ịbanye ma sie ike ịpụ." Agbanyeghị, n'oge a, a na-agbanwekwa gburugburu mmiri mmiri na nso mpaghara microzone. Ihe ndị dị ka ntinye ion, pH, wdg., Mgbanwe nke gburugburu uto na-egosipụtakwu na njirimara ọdịdị nke kristal AFt. "Mkpọchi a mechiri emechi" nke mbugharị mmiri yiri usoro ọrụ nke Pourchez na ndị otu ya kọwara HPMC na-arụ ọrụ na idobe mmiri.

3. Mmechi

(1) Mgbakwunye nke hydroxyethyl methyl cellulose ether (HEMC) na methyl cellulose ether (MC) nwere ike ịgbanwe ọdịdị nke ettringite na mbido (otu ụbọchị) simenti nkịtị.

(2) Ogologo na dayameta nke kristal ettringite dị na slurry simenti HEMC agbanwere bụ obere na mkpụmkpụ ọdịdị mkpanaka; Oke ogologo na dayameta nke kristal ettringite dị na slurry simenti agbanwere MC buru ibu, nke bụ ọdịdị mkpanaka agịga. Kristal ettringite dị na slurry simenti nkịtị nwere oke akụkụ n'etiti ha abụọ.

(3) Mmetụta dị iche iche nke ether cellulose abụọ na nhazi nke ettringite bụ n'ihi ọdịiche dị na ibu molekul.