Mmetụta nke cellulose ethers na evolushọn nke mmiri mmiri na hydration ngwaahịa nke sulphoaluminate ciment mado.

Ihe mejupụtara mmiri na evolushọn microstructure na cellulose ether gbanwetụrụ sulphoaluminate ciment (CSA) slurry ka a mụrụ site na resonance nuklia dị ala na onye nyocha ọkụ. Nsonaazụ gosiri na mgbe mgbakwunye nke cellulose ether, ọ adsorbed mmiri n'etiti flocculation Ọdịdị, nke e ji mara dị ka nke atọ ntụrụndụ ọnụ ọgụgụ kasị elu na transverse ntụrụndụ oge (T2) ụdịdị dị iche iche, na ọnụ ọgụgụ nke adsorbed mmiri na-ejikọta ya nke ọma na usoro onunu ogwu. Na mgbakwunye, cellulose ether mere ka mgbanwe mmiri dị n'etiti ime na n'etiti floc nke CSA flocs. Ọ bụ ezie na mgbakwunye nke cellulose ether enweghị mmetụta na ụdị ngwaahịa hydration nke ciment sulphoaluminate, ọ ga-emetụta ọnụ ọgụgụ nke hydration ngwaahịa nke otu afọ.

Isi okwu:cellulose ether; sulfoaluminate ciment; mmiri; ngwaahịa hydration

0,Okwu mmalite

Cellulose ether, nke a na-esi na cellulose eke eme ya site na usoro usoro, bụ ihe mgbakwunye kemịkalụ na-agbanwe agbanwe na akwụkwọ ndụ akwụkwọ ndụ. A na-ejikarị cellulose ethers dị ka methylcellulose (MC), ethylcellulose (HEC), na hydroxyethylmethylcellulose (HEMC) eme ihe na nkà mmụta ọgwụ, ihe owuwu na ụlọ ọrụ ndị ọzọ. N'ị were HEMC dịka ọmụmaatụ, ọ nwere ike imeziwanye njide mmiri na nkwụsi ike nke simenti Portland, ma na-egbu oge nhazi ciment. N'ọkwa microscopic, HEMC nwekwara mmetụta dị ukwuu na microstructure na pore Ọdịdị nke ciment mado. Dịka ọmụmaatụ, ngwaahịa hydration ettringite (AFt) yikarịrị ka ọ ga-abụ mkpirisi mkpanaka, na akụkụ ya dị ala; n'otu oge ahụ, a na-ebute ọnụ ọgụgụ dị ukwuu nke pores mechiri emechi n'ime ciment ciment, na-ebelata ọnụ ọgụgụ nke pores na-ekwurịta okwu.

Ọtụtụ n'ime ọmụmụ ihe ndị dị ugbu a gbasara mmetụta cellulose ethers na ihe ndị sitere na ciment na-elekwasị anya na simenti Portland. Sulphoaluminate ciment (CSA) bụ simenti nwere obere carbon nke emepụtara onwe ya na obodo m na narị afọ nke 20, yana calcium sulphoaluminate anhydrous dị ka isi ịnweta. N'ihi na nnukwu ego nke AFt nwere ike ịmepụta mgbe hydration gasịrị, CSA nwere uru nke ike mmalite, elu impermeability, na corrosion resistance, na a na-ejikarị eme ihe na ubi nke 3D obibi akwụkwọ, mmiri injinia na-ewu, na ngwa ngwa nrụzi na ala okpomọkụ gburugburu. . N'afọ ndị na-adịbeghị anya, Li Jian et al. nyochaa mmetụta HEMC na ngwa agha CSA site n'echiche nke ike mkpakọ na njupụta mmiri; Wu Kai et al. mụọ mmetụta nke HEMC na mmalite hydration usoro nke CSA ciment, ma mmiri na CSA simenti gbanwetụrụ Iwu nke evolushọn nke components na slurry mejupụtara amaghị. Dabere na nke a, ọrụ a na-elekwasị anya na nkesa nke transverse ntụrụndụ oge (T2) na CSA ciment slurry tupu na mgbe agbakwunyere HEMC site na iji a ala-ubi nuclear magnetik resonance ngwá, na n'ihu nyochaa Mbugharị na mgbanwe iwu nke mmiri na. slurry. A na-amụ mgbanwe ihe mejupụtara nke tapawa ciment.

1. Nnwale

1.1 Akụrụngwa

Ejiri simenti sulphoaluminate abụọ dị n'ahịa, nke akpọrọ CSA1 na CSA2, yana mfu na mgbanye (LOI) nke na-erughị 0.5% (iribiri oke).

A na-eji hydroxyethyl methylcelluloses atọ dị iche iche, nke a na-egosi dịka MC1, MC2 na MC3 n'otu n'otu. A na-enweta MC3 site na ịgwakọta 5% (ọnụọgụ oke) polyacrylamide (PAM) na MC2.

1.2 Ngwakọta ọnụ

A na-agwakọta ụdị cellulose ethers atọ n'ime ciment sulphoaluminate n'otu n'otu, usoro ọgwụgwọ ahụ bụ 0.1%, 0.2% na 0.3% (ọnụọgụ uka, otu n'okpuru). Ngwunye mmiri-ciment a na-edozi bụ 0.6, na mmiri-ciment nke mmiri-ciment ratio nwere ezigbo ọrụ na-adịghị na-agba ọbara site na mmiri oriri ule nke ọkọlọtọ agbanwe agbanwe.

1.3 Usoro

Ngwá ọrụ NMR dị ala ejiri na nnwale ahụ bụ PQ⁃001 NMR analyzer sitere na Shanghai Numei Analytical Instrument Co., Ltd. Ike ndọta nke magnet na-adịgide adịgide bụ 0.49T, ugboro resonance proton bụ 21MHz, na okpomọkụ nke magnet na-edobe mgbe niile na 32.0°C. N'oge ule ahụ, a na-etinye obere karama iko nke nwere ihe nlele cylindrical n'ime eriri nyocha nke ngwá ọrụ ahụ, a na-ejikwa usoro CPMG na-anakọta mgbaàmà ntụrụndụ nke mado ciment. Ka emechara ntụgharị site na ngwanrọ nyocha mmekọrịta, ụzọ ntụgharị T2 nwetara site na iji Sirt inversion algọridim. Mmiri dị iche iche nke nnwere onwe na slurry ga-eji dị iche iche ntụrụndụ ọnụ ọnụ na transverse ntụrụndụ ụdịdị dị iche iche, na ebe nke ntụrụndụ ọnụ ọgụgụ kasị elu na-n'ezie jikọrọ ọnụ na mmiri, dabere na ụdị na ọdịnaya nke mmiri na slurry. nwere ike nyochaa. Iji mepụta resonance magnetik nuklia, ọ dị mkpa iji hụ na etiti etiti O1 (otu: kHz) nke redio na-adaba n'ogo magnet, na O1 na-edozi kwa ụbọchị n'oge ule.

TG?DSC na STA 449C jikọtara thermal analyzer si NETZSCH, Germany nyochara ihe atụ ndị a. A na-eji N2 mee ihe dị ka ikuku nchebe, ọnụego kpo oku bụ 10°C/min, na oke okpomọkụ nke nyocha bụ 30-800°C.

2. Nsonaazụ na mkparịta ụka

2.1 Evolution nke mmiri mmiri

2.1.1 cellulose ether na-adịghị akwụ ụgwọ

Enwere ike ịhụ ọnụ ọnụ elu ntụrụndụ abụọ (akọwapụtara dị ka ọnụ ọgụgụ ntụrụndụ nke mbụ na nke abụọ) n'ụzọ doro anya n'oge ntụgharị ntụgharị (T2) nke slurries ciment sulphoaluminate abụọ. Ọnụ ọgụgụ kasị elu nke ntụrụndụ na-esi n'ime ime nke flocculation, nke nwere nnwere onwe dị ala na obere oge ntụrụndụ transverse; ọnụ ọgụgụ kasị elu nke ntụrụndụ nke abụọ sitere n'etiti ihe owuwu flocculation, nke nwere oke nnwere onwe yana ogologo oge ezumike na-agafe agafe. N'ụzọ dị iche, T2 kwekọrọ na ọnụ ọgụgụ ntụrụndụ mbụ nke simenti abụọ ahụ bụ ihe atụ, ebe ọnụ ọgụgụ ezumike nke abụọ nke CSA1 pụtara ma emechaa. Dị iche na sulphoaluminate ciment clinker na ciment nke ejiri aka ya mee, ọnụ ọnụ ezumike abụọ nke CSA1 na CSA2 na-adaba n'akụkụ ụfọdụ site na steeti mbụ. Site na ọganihu nke hydration, ọnụ ọgụgụ ntụrụndụ mbụ na-eji nwayọọ nwayọọ na-enwere onwe ya, mpaghara ahụ ji nwayọọ nwayọọ na-ebelata, ọ na-apụkwa kpamkpam n'ihe dị ka nkeji 90. Nke a na-egosi na e nwere ụfọdụ mgbanwe mmiri n'etiti nhazi flocculation na nhazi nke flocculation nke ciment abụọ.

Mgbanwe nke ọnụ ọgụgụ kasị elu nke elu ntụrụndụ nke abụọ na mgbanwe nke uru T2 kwekọrọ na njedebe nke elu ahụ na-egosipụta mgbanwe nke mmiri n'efu na nke anụ ahụ na-ejikọta ya na mgbanwe nke ogo nnwere onwe nke mmiri na slurry. . Ngwakọta nke abụọ ahụ nwere ike gosipụta nke ọma na usoro hydration nke slurry. Site na ọganihu nke hydration, ọnụ ọgụgụ kasị elu ji nwayọọ nwayọọ na-ebelata, na ntụgharị nke T2 uru na aka ekpe ji nwayọọ nwayọọ na-abawanye, na e nwere ụfọdụ njikọ kwekọrọ n'etiti ha.

2.1.2 agbakwunyere cellulose ether

Inweta CSA2 agwakọta ya na 0.3% MC2 dị ka ọmụmaatụ, T2 ụdị ntụrụndụ nke ciment sulphoaluminate mgbe agbakwunyere cellulose ether nwere ike ịhụ. Mgbe agbakwunyere cellulose ether, ọnụ ọgụgụ ntụrụndụ nke atọ na-anọchite anya mgbasa ozi nke mmiri site na cellulose ether pụtara n'ọnọdụ ebe oge ezumike na-agafe agafe karịrị 100ms, ebe elu ahụ ji nwayọọ nwayọọ na-abawanye site na mmụba nke cellulose ether ọdịnaya.

Ọnụ ọgụgụ nke mmiri dị n'etiti ihe owuwu flocculation na-emetụta ntugharị nke mmiri n'ime usoro flocculation na mgbasa mmiri nke cellulose ether. Ya mere, ọnụ ọgụgụ mmiri dị n'etiti akụkụ flocculation na-ejikọta ya na nhazi pore nke ime nke slurry na ike mgbasa ozi mmiri nke cellulose ether. Mpaghara nke elu ntụrụndụ nke abụọ dịgasị iche na ọdịnaya nke cellulose ether dịgasị iche iche na ụdị ciment dị iche iche. Mpaghara nke elu izu ike nke abụọ nke CSA1 slurry na-ebelata mgbe niile site na mmụba nke ọdịnaya ether cellulose, ma bụrụ nke kacha nta na 0.3% ọdịnaya. N'ụzọ dị iche, mpaghara izu ike nke abụọ nke CSA2 slurry na-abawanye site na mmụba nke ọdịnaya ether cellulose.

Depụta mgbanwe nke mpaghara nke elu ntụrụndụ nke atọ na mmụba nke ọdịnaya cellulose ether. Ebe ọ bụ na ebe kachasị elu na-emetụta àgwà nke ihe nlele ahụ, ọ na-esiri ike ijide n'aka na àgwà nke ihe mgbakwunye agbakwunyere bụ otu ihe ahụ mgbe ị na-ebu ihe nlele ahụ. Ya mere, a na-eji oke mpaghara akọwa ọnụọgụ mgbama nke ọnụ ọgụgụ ezumike nke atọ n'ụdị dị iche iche. Site na mgbanwe nke ebe nke atọ ntụrụndụ ọnụ ọgụgụ kasị elu na-abawanye nke ọdịnaya nke cellulose ether, ọ pụrụ ịhụ na na-abawanye nke ọdịnaya nke cellulose ether, ebe nke atọ ntụrụndụ ọnụ ọgụgụ isi gosiri na-amụba omume (na). CSA1, mgbe ọdịnaya nke MC1 bụ 0.3%, ọ bụ ihe ọzọ Mpaghara nke ntụrụndụ nke atọ na-ebelata ntakịrị na 0.2%), na-egosi na mmụba nke ọdịnaya nke cellulose ether, mmiri adsorbed na-eji nwayọọ nwayọọ na-abawanye. N'etiti CSA1 slurries, MC1 nwere mma mmiri absorption karịa MC2 na MC3; ebe n'etiti CSA2 slurries, MC2 nwere mmiri kacha mma.

Enwere ike ịhụ ya site na mgbanwe nke mpaghara nke elu ntụrụndụ nke atọ kwa unit nke CSA2 slurry na oge na ọdịnaya nke 0.3% cellulose ether na mpaghara nke atọ ntụrụndụ elu kwa unit uka na-ebelata nọgidere na hydration, na-egosi. na Ebe ọ bụ na ọnụ ọgụgụ hydration nke CSA2 dị ngwa ngwa karịa nke clinker na ciment nke a na-eme onwe ya, cellulose ether enweghị oge maka mgbasa ozi mmiri ọzọ, na-ahapụkwa mmiri adsorbed n'ihi mmụba ngwa ngwa nke mmiri mmiri na-agbakọ na slurry. Na mgbakwunye, mgbasa ozi mmiri nke MC2 siri ike karịa nke MC1 na MC3, nke kwekọrọ na nkwubi okwu gara aga. Enwere ike ịhụ ya site na mgbanwe nke ọnụ ọgụgụ kasị elu nke mpaghara ọ bụla nke atọ nke ntụrụndụ kacha elu nke CSA1 na oge dị iche iche 0.3% dosages nke cellulose ethers na mgbanwe ọchịchị nke atọ ntụrụndụ elu nke CSA1 dị iche na nke CSA2, na mpaghara CSA1 na-abawanye obere oge n'oge mmalite nke hydration. Mgbe ọ na-abawanye ngwa ngwa, ọ na-ebelata ka ọ pụọ n'anya, nke nwere ike ịbụ n'ihi ogologo oge clotting nke CSA1. Tụkwasị na nke ahụ, CSA2 nwere gypsum ndị ọzọ, hydration dị mfe ịmepụta ihe AFt (3CaO Al2O3 3CaSO4 32H2O), na-eri ọtụtụ mmiri n'efu, na ọnụ ọgụgụ nke oriri mmiri karịrị ọnụego nke mgbasa ozi mmiri site na cellulose ether, nke nwere ike iduga The mpaghara izu ike nke atọ nke CSA2 slurry gara n'ihu na-ebelata.

Mgbe ntinye nke cellulose ether gasịrị, ọnụ ọgụgụ ntụrụndụ nke mbụ na nke abụọ gbanwere ruo n'ókè ụfọdụ. Enwere ike ịhụ ya site na ọnụ ọgụgụ kasị elu nke ọnụ ọgụgụ ntụrụndụ nke abụọ nke ụdị abụọ nke ciment slurry na ọhụrụ slurry mgbe gbakwunyere cellulose ether na ọnụ ọgụgụ kasị elu nke elu nke abụọ ntụrụndụ elu nke ọhụrụ slurry dị iche mgbe ịgbakwunye cellulose ether. mmụba, ọdịdị elu ahụ na-agbasawanye. Nke a na-egosi na ntinye nke cellulose ether na-egbochi agglomeration nke simenti ahụ ruo n'ókè ụfọdụ, na-eme ka nhazi nke flocculation dịtụ nro, na-ebelata ogo nke mmiri, ma na-abawanye ogo nnwere onwe nke mmiri n'etiti ihe owuwu flocculation. Otú ọ dị, na mmụba nke usoro onunu ogwu, mmụba nke obosara elu adịghị egosi, na ọnụ ọgụgụ kasị elu nke ụfọdụ ihe atụ na-ebelata. Ọ nwere ike ịbụ na mmụba nke usoro onunu ogwu na-abawanye viscosity nke mmiri mmiri mmiri nke slurry, na n'otu oge ahụ, mgbasa ozi nke cellulose ether na simenti irighiri na-eme ka flocculation. A na-ebelata ogo nnwere onwe nke mmiri n'etiti ihe owuwu.

Enwere ike iji mkpebi kọwaa ogo nkewa dị n'etiti elu izu ike nke mbụ na nke abụọ. Enwere ike gbakọọ ogo nkewa dị ka ogo nke mkpebi = (Afirst components-Asaddle)/Afirst akụrụngwa, ebe Afirst akụrụngwa na Asaddle na-anọchite anya njupụta kachasị nke ọnụ ọgụgụ ntụrụndụ mbụ na njupụta nke ebe kacha ala n'etiti ọnụ ọnụ abụọ ahụ, n'otu n'otu. Enwere ike iji ogo nkewa mee ihe iji kọwaa ogo mgbanwe mmiri n'etiti usoro slurry flocculation na usoro flocculation, na uru bụ n'ozuzu 0-1. Ọnụ ahịa dị elu maka nkewa na-egosi na akụkụ abụọ nke mmiri na-esiwanye ike ịgbanwe, na ọnụ ahịa ya na 1 na-egosi na akụkụ abụọ nke mmiri enweghị ike ịgbanwe ma ọlị.

Enwere ike ịhụ ya site na ngụkọ ngụkọta nke ogo nkewa na ogo nkewa nke cement abụọ na-enweghị mgbakwunye cellulose ether bụ ihe nhata, ha abụọ dị ihe dịka 0.64, na ogo nkewa na-ebelata nke ukwuu mgbe agbakwunyere cellulose ether. N'otu aka ahụ, mkpebi ahụ na-ebelata n'ihu na mmụba nke usoro onunu ogwu, na mkpebi nke elu abụọ ahụ na-adaba na 0 na CSA2 jikọtara ya na 0.3% MC3, na-egosi na cellulose ether na-akwalite mgbanwe nke mmiri n'ime na n'etiti. ihe owuwu flocculation . Dabere n'eziokwu ahụ bụ na ntinye nke cellulose ether enweghị mmetụta ọ bụla na ọnọdụ na mpaghara nke mbụ ntụrụndụ kacha elu, enwere ike ịkọ na mbelata mkpebi bụ akụkụ nke mmụba nke obosara nke elu ntụrụndụ nke abụọ, na Ọdịdị flocculation rụrụ arụ na-eme ka mgbanwe mmiri dị n'etiti ime na n'èzí dị mfe. Tụkwasị na nke ahụ, nchikota nke cellulose ether na nhazi slurry na-eme ka ogo mgbanwe mmiri dị n'etiti ime na n'èzí nke ihe owuwu flocculation. N'aka nke ọzọ, mkpebi mbelata mmetụta nke cellulose ether on CSA2 bụ ike karịa nke CSA1, nke nwere ike ịbụ n'ihi na nta kpọmkwem n'elu ebe na ibu urughuru size nke CSA2, nke bụ ihe mmetụta nke dispersion mmetụta nke cellulose ether mgbe. ntinye.

2.2 Mgbanwe na slurry mejupụtara

Site na TG-DTG ụdịdị CSA1 na CSA2 slurries hydrated maka 90 min, 150 min na 1 ụbọchị, enwere ike ịhụ na ụdị ngwaahịa hydration adịghị agbanwe tupu na mgbe agbakwunyere cellulose ether, na AFt, AFm na AH3 bụ ihe niile. kpụrụ. Akwụkwọ ndị ahụ na-egosi na oke ire ere nke AFt bụ 50-120°C; oke ire ere nke AFm bụ 160-220°C; nso ire ere nke AH3 bụ 220-300°C. Site na ọganihu nke hydration, ịdị arọ nke ihe nlele ahụ ji nwayọọ nwayọọ na-abawanye, na àgwà DTG elu nke AFt, AFm na AH3 ji nwayọọ nwayọọ pụta ìhè, na-egosi na nhazi nke ngwaahịa hydration atọ ji nwayọọ nwayọọ na-abawanye.

Site na ọnụ ọgụgụ dị ukwuu nke ngwaahịa hydration ọ bụla na ihe nlele na afọ hydration dị iche iche, a pụrụ ịhụ na ọgbọ AFt nke oghere oghere na afọ 1d karịrị nke ihe atụ a gwakọtara na cellulose ether, na-egosi na ether cellulose nwere mmetụta dị ukwuu na ya. hydration nke slurry mgbe coagulation. Enwere mmetụta igbu oge ụfọdụ. Na nkeji 90, mmepụta AFm nke ihe atụ atọ ahụ nọgidere bụrụ otu; na 90-150 nkeji, mmepụta nke AFm na oghere oghere dị nwayọọ karịa nke abụọ ndị ọzọ nke ihe atụ; mgbe ụbọchị 1 gachara, ọdịnaya nke AFm dị na oghere oghere bụ otu ihe nlele ahụ jikọtara ya na MC1, yana ọdịnaya AFm nke ihe nlele MC2 dị ntakịrị ala na nlele ndị ọzọ. N'ihe banyere hydration ngwaahịa AH3, ọgbọ ọnụego nke CSA1 oghere sample mgbe hydration maka 90 nkeji bụ budata nwayọọ karịa nke cellulose ether, ma ọgbọ ọnụego bụ budata ngwa ngwa mgbe 90 nkeji, na AH3 mmepụta ego nke atọ samples. bụ otu ụbọchị 1.

Mgbe CSA2 slurry gbachara maka 90min na 150min, ọnụọgụ AFT emepụtara na nlele nke agwakọtara ya na ether cellulose dị obere karịa nke ihe nlele efu, na-egosi na ether cellulose nwekwara mmetụta azụ azụ na CSA2 slurry. Na samples na 1d afọ, a chọpụtara na AFt ọdịnaya nke oghere oghere ka dị elu karịa nke sample agwakọta na cellulose ether, na-egosi na cellulose ether ka nwere ụfọdụ retardation mmetụta na hydration nke CSA2 mgbe ikpeazụ ntọala. na ogo nke nkwụghachi azụ na MC2 dị ukwuu karịa nke nlele agbakwunyere na cellulose ether. MC1. N'ime nkeji 90, ọnụọgụ AH3 nke ihe nlele efu na-emepụta dị ntakịrị karịa nke ihe atụ jikọtara ya na cellulose ether; na nkeji 150, AH3 mere site na oghere oghere karịrị nke ihe atụ a gwakọtara na cellulose ether; na 1 ụbọchị, AH3 mepụtara site na sample atọ bụ nhata.

3. Nkwubi okwu

(1) Cellulose ether nwere ike ịkwalite mgbanwe mmiri dị n'etiti usoro flocculation na nhazi nke flocculation. Mgbe ntinye nke cellulose ether gasịrị, cellulose ether na-eme ka mmiri dị na slurry, bụ nke e ji mara dị ka ntụrụndụ nke atọ na oge ntụrụndụ transverse (T2). Site na mmụba nke ọdịnaya cellulose ether, mmịpụta mmiri nke cellulose ether na-abawanye, na mpaghara nke ntụrụndụ nke atọ na-abawanye. Mmiri nke cellulose ether na-etinye n'ime ya na-eji nwayọọ nwayọọ na-abanye n'ime usoro flocculation na hydration nke slurry.

(2) Ntinye nke cellulose ether na-egbochi agglomeration nke ciment irighiri ihe ruo n'ókè ụfọdụ, na-eme ka usoro flocculation dị ntakịrị; na mmụba nke ọdịnaya, mmiri mmiri viscosity nke slurry na-abawanye, na ether cellulose nwere mmetụta dị ukwuu na akụkụ ciment. Mmetụta mgbasa ozi mgbasa ozi na-abawanye na-ebelata ogo nnwere onwe nke mmiri n'etiti ihe owuwu flocculated.

(3) Tupu na mgbe mgbakwunye nke cellulose ether, ụdị ngwaahịa hydration na sulphoaluminate ciment slurry adịghị agbanwe agbanwe, na AFt, AFm na aluminom gluu; ma cellulose ether ubé egbu oge guzobe nke hydration ngwaahịa mmetụta.