Ụbọchị nbipute: 20, Jun, 2022

3. Usoro ọrụ nke superplasticizers

Usoro nke mmiri na-ebelata ihe n'ụlọnga iji melite fluidity nke ihe ngwakọta tumadi gụnyere dispersing mmetụta na lubricating mmetụta. The mmiri mbenata gị n'ụlọnga bụ n'ezie a surfactant, otu njedebe nke ogologo molekul yinye na-adị mfe soluble na mmiri - hydrophilic otu, na nke ọzọ ọgwụgwụ bụ insoluble na mmiri - hydrophobic otu.

a. Mgbasa: Mgbe a na-agwakọta ciment na mmiri, n'ihi ihe na-adọrọ adọrọ nke cement cement, cement slurry na-emepụta usoro flocculation, nke mere na 10% ruo 30% nke mmiri na-agwakọta mmiri na-ekekọta na ciment irighiri ma ghara itinye aka na n'efu. eruba na mmanu mmanu. mmetụta, si otú ahụ na-emetụta fluidity nke ihe ngwakọta. Mgbe a na-agbakwunye onye na-ebelata mmiri mmiri, n'ihi na a na-ejikọta mkpụrụ ndụ ndị na-ebelata mmiri na-edozi ahụ n'elu akụkụ ciment, elu nke ciment ahụ nwere otu ụgwọ ahụ (na-abụkarị ụgwọ na-adịghị mma), na-eme ka mmetụta nke electrostatic repulsion, nke. na-akwalite mgbasa nke akụkụ ciment na mbibi nke usoro flocculation. , hapụ akụkụ mmiri ahụ a kechiri ekpuchi ma sonye na mmiri na-asọpụta, si otú ahụ na-amụba n'ụzọ dị irè nke mmiri nke ngwakọta ihe.

b. Lubrication: ìgwè hydrophilic dị na superplasticizer dị nnọọ polar, ya mere ihe nkiri adsorption nke superplasticizer n'elu akụkụ ciment nwere ike ịmepụta ihe nkiri mmiri siri ike na mmiri mmiri, na ihe nkiri mmiri a nwere ezigbo mmanu mmanu nwere ike ibelata ihe mmịfe ahụ nke ọma. eguzogide n'etiti simenti ahụ, si otú n'ihu mma na fluidity nke ihe.

Mmetụta nke onye na-ebelata mmiri na kọmpat, wdg.

a. Tọọ oge. Superplasticizers n'ozuzu enweghị mmetụta na-azụ azụ, ma nwee ike ịkwalite hydration na ike siri ike nke ciment. Superplasticizer azụ azụ bụ ngwakọta nke superplasticizer na retarder. N'okpuru ọnọdụ nkịtị, iji gbuo oge hydration nke ciment ma belata mfu nke slump, a na-agbakwunye ụfọdụ nke retarder na onye na-ebelata mmiri.

b. Ọdịnaya gas. Ka ọ dị ugbu a, onye na-ebelata mmiri polycarboxylate a na-ejikarị eme ihe nwere ụfọdụ ikuku ikuku, na ikuku ikuku nke ihe ahụ ekwesịghị ịdị elu, ma ọ bụghị ya, ike siri ike ga-ebelata nke ukwuu.

c. Njide mmiri.

Superplasticizers anaghị enye aka nke ukwuu n'ibelata ọbara ọgbụgba nke sink, ma nwee ike ịbawanye ọbara ọgbụgba. Ọbara ọgbụgba na-abawanye mgbe usoro onunu ogwu karịrị akarị.