Njirimara nke Tapawa Simenti nke Cellulose Ether gbanwere

Site n'ịtụle ihe eji arụ ọrụ, ọnụ ọgụgụ njide mmiri, ịtọ oge na okpomọkụ nke hydration nke cellulose ether na viscosities dị iche iche na dosages dị iche iche nke ciment mado, na iji SEM nyochaa ngwaahịa hydration, mmetụta nke cellulose ether na-arụ ọrụ nke ciment mado bụ. gụrụ akwụkwọ. iwu nke mmetụta. Nsonaazụ na-egosi na mgbakwunye nke cellulose ether nwere ike igbu oge ciment hydration, na-egbu oge ciment hardening na ntọala, belata hydration okpomọkụ ntọhapụ, ogologo oge ọdịdị nke hydration okpomọkụ elu, na retarding mmetụta na-abawanye na-abawanye nke onunu ogwu na viscosity. Cellulose ether nwere ike ime ka ọnụ ọgụgụ nke mmiri na-ejide mmiri dịkwuo elu, ma nwee ike melite njigide mmiri nke ngwa agha na nhazi nke dị nro, ma mgbe ọdịnaya karịrị 0.6%, mmụba nke njide mmiri adịghị mkpa; ọdịnaya na viscosity bụ ihe na-ekpebi cellulose modified ciment slurry. Na ngwa nke cellulose ether modified ngwa agha, usoro onunu ogwu na viscosity kwesịrị ka a tụlere nke ọma.

Isi okwu:cellulose ether; usoro onunu ogwu; retardation; njide mmiri

Ngwa ngwa ihe owuwu bụ otu n'ime ihe eji ewu ụlọ maka ọrụ owuwu. N'ime afọ ndị na-adịbeghị anya, na nnukwu ngwa ngwa nke ihe mkpuchi mgbidi na nkwalite nke mgbochi mgbawa na mgbochi seepage chọrọ maka mgbidi dị n'èzí, a na-etinye ihe ndị dị elu maka nkwụsị mgbawa, ịrụ ọrụ njikọ na ịrụ ọrụ nke ngwa agha. N'ihi adịghị ike nke nnukwu ihicha shrinkage, adịghị ike na-adịghị mma, na ike njigide dị ala, ngwa agha ọdịnala na-adịkarịghị enwe ike iru ihe a chọrọ n'iwu, ma ọ bụ na-akpata nsogbu dị ka ịdapụ nke ihe ịchọ mma. Dị ka ụrọ plasta, n'ihi na ngwa ngwa na-efunahụ mmiri ngwa ngwa, nhazi na oge siri ike na-ebelata, na nsogbu ndị dị ka mgbawa na oghere na-eme n'oge nnukwu ihe owuwu, nke na-emetụta àgwà nke ọrụ ahụ nke ọma. Ngwa ngwa ọdịnala na-efunahụ mmiri ngwa ngwa na hydration ciment ezughị ezu, na-eme ka obere oge oghere nke ciment ciment, nke bụ isi ihe na-emetụta arụmọrụ nke ngwa agha ahụ.

Cellulose ether nwere mmetụta dị nro na njigide mmiri, a na-ejikwa ya n'ọtụtụ ebe n'ọhịa nke ngwa agha, ọ ghọwokwa admixture dị mkpa iji meziwanye njide mmiri nke ngwa agha ma nye ịrụ ọrụ ihe owuwu, na-ebelata ihe owuwu na mgbe e mesịrị iji ngwa agha ọdịnala mee ihe. . Nsogbu nke mmiri na-efunahụ na ọkara. Cellulose eji na ngwa agha na-agụnyekarị methyl cellulose ether (MC), hydroxypropyl methyl cellulose (HPMC), hydroxyethyl methyl cellulose ether (HEMC), hydroxyethyl cellulose ether (HEC), wdg N'ime ha, HPMC na HEMC bụ ndị kasị eme ihe.

Akwụkwọ a na-amụkarị mmetụta nke cellulose ether na workability (ọnụego njide mmiri, mmiri na-efunahụ na oge nhazi oge), ihe eji arụ ọrụ (ike mkpakọ na ike njikọ ike), iwu hydration na microstructure nke cement ciment. Ọ na-enye nkwado maka ihe onwunwe nke cellulose ether gbanwetụrụ ciment mado ma na-enye ntụaka maka ngwa nke cellulose ether modified mortar.

1. Nnwale

1.1 Akụrụngwa

Simenti: Simenti Portland nkịtị (PO 42.5) ciment nke Wuhan Yadong Cement Company rụpụtara, nke nwere akụkụ elu nke 3500 cm.²/g.

Cellulose ether: hydroxypropyl methylcellulose ether dị na ahịa (MC-5, MC-10, MC-20, viscosities nke 50,000 Pa·S, 100000 Pa·S, 200000 Pa·S, n'otu n'otu).

1.2 Usoro

Ihe eji eme ihe: N'ime usoro nkwadebe ihe nlele, usoro nke cellulose ether bụ 0.0% ~ 1.0% nke ciment uka, na mmiri-ciment ruru 0.4. Tupu ị gbakwunye mmiri na edemede, gwakọta cellulose ether na ciment nke ọma. A na-eji mpempe ciment nwere ihe nlele nke 40 x 40 x 40 maka ule.

Nhazi oge: A na-eme usoro nha dịka GB/T 1346-2001 "Cment Standard Consistency Water Consumption, Setting Time, Stability Test Method".

Njide mmiri: Nnwale nke njigide mmiri nke cement ciment na-ezo aka na ọkọlọtọ DIN 18555 "Ule ule maka ngwa ngwa simentious inorganic".

Okpomọkụ nke hydration: Nnwale ahụ nakweere TAM Air microcalorimeter nke ụlọ ọrụ TA Instrument nke United States, na mmiri-ciment ruru 0.5.

Ngwaahịa hydration: kpalite mmiri na cellulose ether nke ọma, wee dozie slurry ciment, malite oge, were nlele n'oge dị iche iche, kwụsị hydration na ethanol zuru oke maka nnwale, na mmiri-ciment ruru 0.5.

2. Nsonaazụ na mkparịta ụka

2.1 Mechanical Njirimara

Site na mmetụta nke cellulose ether ọdịnaya na ike, enwere ike ịhụ na mmụba nke MC-10 cellulose ether ọdịnaya, ike nke 3d, 7d na 28d niile na-ebelata; cellulose ether na-ebelata ike nke 28d karịa nke ọma. Site na mmetụta nke cellulose ether viscosity na ike, a pụrụ ịhụ na ma ọ bụ cellulose ether na viscosity nke 50,000 ma ọ bụ 100,000 ma ọ bụ 200,000, ike nke 3d, 7d, na 28d ga-ebelata. A pụkwara ịhụ na cellulose ether viscosity enweghị mmetụta dị ịrịba ama na ike.

2.2 ịtọ oge

Site na mmetụta nke ọdịnaya nke 100,000 viscosity cellulose ether na oge nhazi, enwere ike ịhụ na mmụba nke ọdịnaya nke MC-10, ma oge ntọala mbụ na oge nhazi ikpeazụ na-abawanye. Mgbe ọdịnaya ahụ bụ 1%, oge nhazi mbụ ruru 510min, na oge ntọala ikpeazụ ruru 850min. E jiri ya tụnyere oghere ahụ, ogologo oge ntọala mbụ ahụ ka ogologo nkeji iri abụọ na iri na ise, ma ogologo oge nhazi ikpeazụ ka agbatịkwara 470min.

Site na mmetụta nke cellulose ether viscosity na ịtọ oge, enwere ike ịhụ na ma ọ bụ MC-5, MC-10 ma ọ bụ MC-20, ọ nwere ike igbu oge nhazi nke ciment, ma e jiri ya tụnyere cellulose ethers atọ, ntọala mbụ. oge na nhazi ikpeazụ Oge na-agbatịkwu na mmụba nke viscosity. Nke a bụ n'ihi na ether cellulose nwere ike ịgbanye n'elu akụkụ ciment, si otú ahụ na-egbochi mmiri ịkpọtụrụ na simenti, si otú ahụ na-egbu oge hydration ciment. Ka viscosity nke cellulose ether na-abawanye, ka oyi akwa adsorption na-adị n'elu irighiri ciment, na mmetụta na-ebelata.

2.3 Ọnụ njide mmiri

Site na iwu mmetụta nke cellulose ether ọdịnaya na ọnụ ọgụgụ njide mmiri, a pụrụ ịhụ na mmụba nke ọdịnaya, ọnụ ọgụgụ mmiri nke mmiri mmiri na-abawanye, na mgbe cellulose ether dị elu karịa 0.6%, ọnụ ọgụgụ mmiri na-ejide mmiri. kwụsiri ike na mpaghara. Otú ọ dị, n'iji tụnyere cellulose ethers atọ, e nwere ọdịiche dị na mmetụta nke viscosity na ọnụ ọgụgụ njide mmiri. N'okpuru otu usoro onunu ogwu, mmekọrịta dị n'etiti ọnụ ọgụgụ njide mmiri bụ: MC-5≤MC-10≤MC-20.

2.4 Okpomọkụ nke hydration

Site na mmetụta nke cellulose ether ụdị na ọdịnaya na okpomọkụ nke hydration, a pụrụ ịhụ na na-abawanye nke MC-10 ọdịnaya, exothermic okpomọkụ nke hydration na-ebelata nwayọọ nwayọọ, na oge nke hydration okpomọkụ elu mgbanwe mgbe e mesịrị; Okpomọkụ nke hydration nwekwara mmetụta dị ukwuu. Site na mmụba nke viscosity, okpomọkụ nke hydration na-ebelata nke ukwuu, na ọnụ ọgụgụ kasị elu nke hydration okpomọkụ gbanwere nke ukwuu mgbe e mesịrị. Ọ na-egosi na cellulose ether nwere ike igbu oge ciment hydration, na ya retarding mmetụta na-metụtara ọdịnaya na viscosity nke cellulose ether, nke na-ekwekọ na analysis N'ihi na ịtọ oge.

2.5 Nyocha nke ngwaahịa hydration

Site na nyocha SEM nke ngwaahịa hydration 1d, enwere ike ịhụ na mgbe 0.2% MC-10 cellulose ether agbakwunyere, enwere ike ịhụ nnukwu clinker na-adịghị mma na ettringite nwere crystallization ka mma. %, kristal ettringite na-ebelata nke ukwuu, nke na-egosi na ether cellulose nwere ike igbu oge hydration nke ciment na ịmepụta ngwaahịa hydration n'otu oge. Site n'ịtụle ụdị cellulose ethers atọ, enwere ike ịhụ na MC-5 nwere ike ime ka kristal nke ettringite na ngwaahịa hydration na-adị mgbe niile, na kristal nke ettringite na-adịkwa mgbe niile. metụtara ọkpụrụkpụ nke oyi akwa.

3. Nkwubi okwu

a. Mgbakwunye nke cellulose ether ga-egbu oge hydration nke ciment, na-egbu oge siri ike na ntọala nke ciment, belata ntọhapụ okpomọkụ nke hydration, na ogologo oge ọdịdị nke hydration okpomọkụ elu. Site na mmụba nke usoro onunu ogwu na viscosity, mmetụta retarding ga-abawanye.

b. Cellulose ether nwere ike iwelie ọnụ mmiri nke ngwa ngwa, ma nwee ike melite njigide mmiri nke ngwa agha na ihe dị mkpa. Njide mmiri ya metụtara usoro onunu ogwu na viscosity. Mgbe usoro onunu ogwu gafere 0.6%, mmetụta njide mmiri anaghị abawanye nke ukwuu.