Cellulose ether gbanwetụrụ slurry ciment

A mụrụ mmetụta nke usoro ihe dị iche iche molekụla nke na-abụghị ionic cellulose ether na pore Ọdịdị nke ciment slurry site arụmọrụ njupụta ule na macroscopic na microscopic pore Ọdịdị Ọdịdị. Nsonaazụ na-egosi na nonionic cellulose ether nwere ike ịbawanye porosity nke ciment slurry. Mgbe viscosity nke na-abụghị ionic cellulose ether gbanwetụrụ slurry yiri, porosity nke.hydroxyethyl cellulose ether(HEC) slurry gbanwetụrụ pere mpe karịa nke hydroxypropyl methyl cellulose ether (HPMC) na methyl cellulose ether (MC) gbanwetụrụ slurry. Na ala viscosity/ ikwu molekụla arọ nke HPMC cellulose ether nwere yiri otu ọdịnaya, nta nke porosity nke ciment slurry gbanwetụrụ. Na-abụghị ionic cellulose ether nwere ike ibelata elu esemokwu nke mmiri mmiri mmiri na-eme ka ciment slurry mfe na-etolite egosipụta. A na-anakọta ụmụ irighiri ihe ndị na-abụghị ionic cellulose ether n'ụzọ na ikuku mmiri mmiri nke egosipụta, nke na-abawanye viscosity nke cement slurry na-eme ka ikike nke ciment slurry kwụsie ike.

Isi okwu:nonionic cellulose ether; ciment slurry; Ọdịdị pore; Ọdịdị molekụla; Esemokwu dị n'elu; viscosity

Nonionic cellulose ether (nke a na-akpọ cellulose ether) nwere ọmarịcha ịgba na njigide mmiri, a na-ejikwa ya na ngwa ngwa agwakọta akọrọ, ihe na-ejikọta onwe ya na ihe ndị ọzọ dabeere na ciment. Cellulose ethers eji na ciment dabeere ihe na-agụnyekarị methyl cellulose ether (MC), hydroxypropyl methyl cellulose ether (HPMC), hydroxyethyl methyl cellulose ether (HEMC) na hydroxyethyl cellulose ether (HEC), n'ime nke HPMC na HEMC bụ ndị kasị ngwa ngwa. .

Cellulose ether nwere ike imetụta ihe owuwu pore nke ciment slurry. Pourchez et al., Site n'ule njupụta pụtara ìhè, ule nha nha (usoro ịgba ọgwụ mercury) na nyocha onyonyo sEM, kwubiri na cellulose ether nwere ike ịbawanye ọnụ ọgụgụ nke pores na dayameta nke ihe dịka 500nm na pores nwere dayameta nke ihe dịka 50-250μm na ciment slurry. Ọzọkwa, maka siri ike ciment slurry, The pore size nkesa nke ala molekul arọ HEC modified ciment slurry yiri nke dị ọcha ciment slurry. Mkpokọta pore olu nke elu molekul arọ HEC gbanwetụrụ ciment slurry dị elu karịa nke dị ọcha ciment slurry, ma ala karịa nke HPMC gbanwetụrụ ciment slurry na Olee ihe enyemaka otu agbanwe agbanwe. Site na nyocha SEM, Zhang et al. chọpụtara na HEMC nwere ike ịbawanye ọnụ ọgụgụ pores nke nwere dayameta nke ihe dịka 0.1mm na ngwa ngwa ciment. Ha chọpụtakwara site na ule injection nke mercury na HEMC nwere ike ịbawanye ụda pore zuru oke na nkezi pore dayameta nke ciment slurry, na-ebute mmụba dị ukwuu na ọnụ ọgụgụ buru ibu nke nwere dayameta nke 50nm ~ 1μm na nnukwu pores na dayameta nke ndị ọzọ. karịa 1μm. Agbanyeghị, ọnụ ọgụgụ pores nwere dayameta na-erughị 50nm belatara nke ukwuu. Saric-Coric et al. kwenyere na cellulose ether ga-eme ka ciment slurry dịkwuo porous ma na-eduga na mmụba nke macropores. Jenni et al. nwalere njupụta arụmọrụ wee kpebisie ike na akụkụ pore volume of HEMC modified mortar ciment bụ ihe dịka 20%, ebe ngwa ngwa ciment dị ọcha nwere naanị obere ikuku. Silva et al. chọpụtara na na mgbakwunye na elu abụọ dị na 3.9 nm na 40 ~ 75nm dị ka ciment slurry dị ọcha, enwekwara ọnụ elu abụọ na 100 ~ 500nm na karịa 100μm site na ule ịgba ọgwụ mercury. Ma Baoguo et al. chọpụtara na cellulose ether mụbara ọnụ ọgụgụ nke ọma pores na dayameta na-erughị 1μm na nnukwu pores na dayameta karịa 2μm na simenti ngwa agha site na mercury injection test. Dị ka ihe mere na cellulose ether enwekwu ndị porosity nke ciment slurry, ọ na-na-emekarị kweere na cellulose ether nwere elu ọrụ, ga-ba ọgaranya na ikuku na mmiri interface, na-akpụ a film, ka stabilize na egosipụta na ciment slurry.

Site na nyocha akwụkwọ ndị dị n'elu, a pụrụ ịhụ na mmetụta nke cellulose ether na nhazi pore nke ihe ndị dabeere na ciment enwetawo nlebara anya dị ukwuu. Otú ọ dị, e nwere ọtụtụ ụdị cellulose ether, otu ụdị cellulose ether, ya ikwu molekụla arọ, otu ọdịnaya na ndị ọzọ molekụla Ọdịdị parameters dịkwa nnọọ iche, na anụ ụlọ na mba ọzọ na-eme nchọpụta na cellulose ether nhọrọ bụ nanị na-ejedebeghị na ngwa ha. ubi, enweghị ihe nnọchiteanya, nkwubi okwu bụ ihe a na-apụghị izere ezere "overgeneralization", nke mere na nkọwa nke cellulose ether usoro adịghị omimi. N'akwụkwọ a, a na-enyocha mmetụta nke cellulose ether nwere usoro ihe omimi dị iche iche na nhazi pore nke ciment slurry site na nyocha njupụta pụtara ìhè na macroscopic na microscopic pore structure.

1. Nwale

1.1 Akụrụngwa

Simenti ahụ bụ ciment P·O 42.5 nkịtị Portland rụpụtara site na Huaxin Cement Co., LTD., nke a tụrụ kemịkalụ kemịkalụ site AXIOS Ad-Vanced wavelength dispersion-ụdị X-ray fluorescence spectrometer (PANa — lytical, Netherlands), na usoro Bogue mere atụmatụ nhazi nke oge ahụ.

Cellulose ether ahọpụtara ụdị anọ nke cellulose ether azụmahịa, karị methyl cellulose ether (MC), hydroxypropyl methyl cellulose ether (HPMC1, HPMC2) na hydroxyethyl cellulose ether (HEC), HPMC1 molekụla Ọdịdị na HPMC2 yiri, ma viscosity bụ nnọọ obere karịa HPMC2. , Ya bụ, ndị ikwu molekul uka nke HPMC1 dị nnọọ nta karịa nke HPMC2. N'ihi ihe ndị yiri ya nke hydroxyethyl methyl cellulose ether (HEMc) na HPMC, ahọpụtaghị HEMC n'ọmụmụ ihe a. Iji zere mmetụta nke ọdịnaya mmiri na nsonaazụ ule, a na-eme ethers cellulose niile na 98 ℃ maka awa 2 tupu ejiri ya.

A nwalere viscosity nke cellulose ether site na NDJ-1B rotary viscosimeter (Ụlọ ọrụ Shanghai Changji). Ntụle ngwọta ule (oke nke cellulose ether na mmiri) bụ 2.0%, okpomọkụ bụ 20 ℃, na ntụgharị ntụgharị bụ 12r / min. A nwalere esemokwu elu nke cellulose ether site na usoro mgbanaka. Ngwa ule bụ JK99A akpaka tensiometer (Ụlọ ọrụ Shanghai Zhongchen). Ịta nke ngwọta ule bụ 0.01% na okpomọkụ bụ 20 ℃. A na-enye ọdịnaya otu cellulose ether site n'aka onye nrụpụta.

Dị ka viscosity, elu esemokwu na otu ọdịnaya nke cellulose ether, mgbe ngwọta ngwọta bụ 2.0%, viscosity ratio nke HEC na HPMC2 ngwọta bụ 1: 1.6, na viscosity ratio nke HEC na MC ngwọta bụ 1: 0.4, ma. N'ime ule a, mmiri ciment ruru 0.35, oke ciment bụ 0.6%, oke nke cellulose ether na mmiri bụ ihe dịka 1.7%, ihe na-erughị 2.0%, na mmetụta synergistic nke ciment slurry na viscosity, yabụ, viscosity iche nke HEC, HPMC2 ma ọ bụ MC gbanwetụrụ ciment slurry bụ obere.

Dị ka viscosity, elu esemokwu na otu ọdịnaya nke cellulose ether, elu esemokwu nke ọ bụla cellulose ether dị iche iche. Cellulose ether nwere ma hydrophilic otu (hydroxyl na ether otu) na hydrophobic otu (methyl na glucose carbon mgbanaka), bụ surfactant. Cellulose ether dị iche iche, ụdị na ọdịnaya nke hydrophilic na hydrophobic dị iche iche, na-akpata esemokwu dị iche iche dị n'elu.

1.2 Ụzọ nnwale

A kwadebere ụdị ciment slurry isii, gụnyere ciment slurry dị ọcha, cellulose ether anọ (MC, HPMCl, HPMC2 na HEC) gbanwere ciment slurry na 0.60% cement ratio na HPMC2 gbanwere ciment slurry na 0.05% cement ratio. Ref, MC - 0.60, HPMCl - 0.60, Hpmc2-0.60. HEC 1-0.60 na hpMC2-0.05 na-egosi na mmiri-ciment ruru ma 0.35.

Cement slurry mbụ dị na GB / T 17671 1999 "ciment ngwa agha ike ule usoro (ISO usoro)" mere n'ime 40mm × 40mm × 160mm prisms ule ngọngọ, n'okpuru ọnọdụ nke 20 ℃ anọkwasị curing 28d. Mgbe ọ tụlechara ma gbakọọ njupụta ya pụtara ìhè, a na-eji obere hama gbawaa ya, a na-ahụkwa ọnọdụ oghere macro nke etiti etiti ule nyocha wee jiri igwefoto dijitalụ see ya. N'otu oge ahụ, a na-ewere obere mpempe 2.5 ~ 5.0mm maka nleba anya site na microscope anya (HIROX microscope video akụkụ atọ) na nyocha microscope electron (JSM-5610LV).

2. Nsonaazụ ule

2.1 Njupụta pụtara ìhè

Dị ka o doro anya njupụta nke ciment slurry gbanwetụrụ dị iche iche cellulose ethers, (1) pụtara njupụta nke dị ọcha ciment slurry bụ nke kasị elu, nke bụ 2044 kg/m³; Njupụta pụtara ìhè nke ụdị anọ nke cellulose ether gbanwetụrụ slurry na ciment ruru nke 0.60% bụ 74% ~ 88% nke dị ọcha ciment slurry, na-egosi na cellulose ether kpatara mmụba na porosity nke ciment slurry. (2) Mgbe oke ciment na ciment bụ 0.60%, mmetụta nke cellulose ethers dị iche iche na porosity nke ciment slurry dị nnọọ iche. The viscosity nke HEC, HPMC2 na MC gbanwetụrụ ciment slurry yiri, ma o doro anya njupụta nke HEC modified ciment slurry bụ nke kasị elu, na-egosi na porosity nke HEC gbanwetụrụ ciment slurry bụ obere karịa nke HPMc2 na Mc modified ciment slurry na yiri viscosity. . HPMc1 na HPMC2 nwere ụdị ọdịnaya otu, ma viscosity nke HPMCl dị nnọọ ala karịa nke HPMC2, na njupụta pụtara ìhè nke HPMCl gbanwetụrụ ciment slurry dị nnọọ elu karịa nke HPMC2 gbanwetụrụ ciment slurry, nke na-egosi na mgbe ọdịnaya otu yiri nke ahụ. , na ala viscosity nke cellulose ether, na-ebelata porosity nke ciment slurry gbanwetụrụ. (3) Mgbe ciment-to-ciment ruru dị nnọọ nta (0.05%), pụtara njupụta nke HPMC2-gbanwetụrụ ciment slurry bụ isi nso na nke dị ọcha ciment slurry, na-egosi na mmetụta nke cellulose ether na porosity nke ciment. slurry dị obere.

2.2 macroscopic pore

Dị ka akụkụ foto nke cellulose ether gbanwetụrụ ciment slurry were igwefoto dijitalụ, dị ọcha ciment slurry bụ nnọọ ok, ọ fọrọ nke nta ọ dịghị anya pores; Ụdị anọ nke cellulose ether gbanwetụrụ slurry na 0.60% ciment ratio niile nwere ihe macroscopic pores, na-egosi na cellulose ether na-eduga ná mmụba nke ciment slurry porosity. Dị ka nsonaazụ nke nnwale njupụta pụtara ìhè, mmetụta nke ụdị cellulose ether dị iche iche na ọdịnaya dị na porosity nke ciment slurry dị nnọọ iche. The viscosity nke HEC, HPMC2 na MC modified slurry yiri, ma porosity nke HEC modified slurry dị nta karịa nke HPMC2 na MC modified slurry. Ọ bụ ezie na HPMC1 na HPMC2 nwere ọdịnaya otu yiri nke ahụ, HPMC1 gbanwetụrụ slurry nwere viscosity dị ala nwere obere porosity. Mgbe cement-to-ciment ruru nke HPMc2 modified slurry dị nnọọ nta (0.05%), ọnụ ọgụgụ nke macroscopic pores na-ubé mụbara karịa nke dị ọcha ciment slurry, ma nke ukwuu belatara karịa nke HPMC2 gbanwetụrụ slurry na 0.60% ciment-to. -ciment ruru.

2.3 Microscopic pore

4. Nkwubi okwu

(1) Cellulose ether nwere ike ịbawanye porosity nke ciment slurry.

(2) Mmetụta nke cellulose ether na porosity nke ciment slurry dị iche iche molekụla Ọdịdị parameters dị iche iche: mgbe viscosity nke cellulose ether gbanwetụrụ ciment slurry yiri, porosity nke HEC gbanwetụrụ ciment slurry bụ obere karịa nke HPMC na MC gbanwetụrụ. ciment slurry; Na ala viscosity/ ikwu molekụla arọ nke HPMC cellulose ether nwere yiri otu ọdịnaya, ala porosity nke ciment slurry gbanwetụrụ.

(3) Mgbe na-agbakwụnye cellulose ether n'ime ciment slurry, elu esemokwu nke mmiri mmiri na-adọ na-ebelata, nke mere na ciment slurry dị mfe na-etolite egosipụta m cellulose ether molekul directional adsorption na afụ gas-mmiri interface, melite ike na siri ike nke mgbasa ozi ihe nkiri afụ mmiri na ikuku gas-mmiri interface, na-eme ka ike nke ihe nkiri mmiri mmiri na-eme ka ike sie ike nke apịtị siri ike iji mee ka afụ ahụ kwụsie ike.