Hydroxypropyl methylcellulose bụ ngwakọta mmiri na-agbaze mmiri, nke a makwaara dị ka resin mmiri na-agbaze ma ọ bụ polima na-agbaze mmiri. Ọ na-eme ka ngwakọta ahụ sie ike site n'ịbawanye viscosity nke mmiri na-agwakọta. Ọ bụ ihe onwunwe polymer hydrophilic. Enwere ike igbari ya na mmiri iji mepụta ngwọta ma ọ bụ mgbasa. Nnwale na-egosi na mgbe ọnụọgụ superplasticizer dabeere na naphthalene na-abawanye, ntinye nke superplasticizer ga-ebelata nkwụsị nkesa nke ngwa ngwa ciment agwakọtara ọhụrụ. Nke a bụ n'ihi na naphthalene superplasticizer bụ surfactant. Mgbe a na-agbakwunye ihe na-ebelata mmiri na ngwa ngwa ahụ, a na-ahazi ihe na-ebelata mmiri n'elu akụkụ ciment, nke mere na elu nke ciment ahụ nwere otu ụgwọ ahụ. Igwe ọkụ eletrik a na-agbaji ihe owuwu flocculation nke ihe simenti na-emepụta, na mmiri a na-agbanye n'ime ihe owuwu ahụ na-ahapụ ya, na-akpata nkwụsị nke akụkụ ciment. N'otu oge ahụ, a chọpụtara na na mmụba nke ọdịnaya HPMC, nkwụsị nke nkwụsị nke ciment ciment ọhụrụ bịara dịkwuo mma ma dị mma.
Njirimara ike nke konkịtị:
HPMC n'okpuru mmiri na-abụghị dispersible ihe admixture na-eji na okporo ụzọ àkwà mmiri ntọala engineering, na imewe ike larịị bụ C25. Dị ka isi ule, ego nke simenti bụ 400kg, ego nke microsilica bụ 25kg / m3, kacha mma ego nke HPMC bụ 0,6% nke ciment ego, mmiri-ciment ruru 0.42, ájá ruru 40%. na mmepụta nke naphthyl superplasticizer bụ 8% nke ego ciment. , The ihe ụdị n'ikuku nke 28 ụbọchị nwere nkezi ike nke 42.6MPa, na ihe wụsara n'okpuru mmiri maka 28 ụbọchị na mmiri dobe nke 60mm nwere nkezi ike nke 36.4 MPa.
1. Mgbakwunye nke HPMC nwere mmetụta retarding doro anya na ngwakọta ngwa agha. Site na mmụba nke ọdịnaya HPMC, oge nhazi nke ngwa agha na-eji nwayọọ nwayọọ na-agbatị. N'okpuru otu ọdịnaya HPMC, ngwa agha a kpụrụ n'okpuru mmiri dị mma karịa ngwa agha a kpụrụ na ikuku. Oge siri ike nke ịkpụzi dị ogologo. Nke a na atụmatụ mmemme n'okpuru mmiri ihe mgbapụta.
2. Ngwa ngwa ciment ọhụrụ agwakọta ya na hydroxypropyl methylcellulose nwere arụmọrụ njikọ dị mma yana ọ naghị agba ọbara.
3. Ọdịnaya nke HPMC na agụụ mmiri nke ngwa agha belatara na mbụ wee mụbaa nke ukwuu.
4. The incorporation nke mmiri mbenata gị n'ụlọnga mma nsogbu nke ụba mmiri na-achọ ngwa agha, ma ọ ga-achịkwa ezi uche, ma ọ ga-mgbe ụfọdụ belata n'okpuru mmiri dispersion iguzogide nke freshly agwakọta ngwa agha.
5. Enwere obere ihe dị iche na nhazi nke cement paste specimen gwakọtara na HPMC na oghere oghere, ọ dịghịkwa ihe dị iche na nhazi na njupụta nke cement paste spicimen na ịwụsa mmiri na ikuku. Ihe nlele emere mgbe ụbọchị iri abụọ na asatọ gachara n'okpuru mmiri tọgbọrọ chakoo. Isi ihe kpatara ya bụ na mgbakwunye HPMC na-ebelata oke mfu na mgbasa nke ciment n'oge a na-awụsa na mmiri, ma na-ebelatakwa okwute simenti. Na oru ngo, a ga-ebelata ego nke HPMC dị ka o kwere mee ka ị na-ahụ mmetụta nke enweghị mgbasa n'okpuru mmiri.
6. Nchikota nke HPMC n'okpuru mmiri na-adịghị agbasa ihe admixture, akara nke ego na-eme ka mma nke ike. Ọrụ ndị na-anya ụgbọelu egosila na ihe ndị a kpụrụ na mmiri nwere ike ruru 84.8% nke a kpụrụ na ikuku, na mmetụta dị ọbụna karị.
Oge nzipu: Jun-16-2023