Mmepe na ngwa nkepolycarboxylic superplasticizerdịtụ ngwa ngwa. Karịsịa na nnukwu ọrụ dị mkpa dị ka nchekwa mmiri, ike mmiri, injinia hydraulic, injin mmiri, na àkwà mmiri, polycarboxylate superplastisizer na-ejikarị eme ihe.
Mgbe a gwakọtara ciment na mmiri, slurry ciment na-etolite usoro flocculation n'ihi ịdị arọ nke mkpụrụ ndụ nke cement, nke mere na 10% ruo 30% nke mmiri na-agwakọta mmiri na-ekpuchi ya na akụkụ ciment na enweghị ike itinye aka na mmiri na-asọba n'efu na mmanu mmanu. , si otú ahụ na-emetụta Flowability nke ihe mix. Mgbe a na-agbakwunye supreplasticizer, a na-eme ka ụmụ irighiri mmiri na-ebelata mmiri na-edozi ahụ n'elu akụkụ ciment, nke mere na akụkụ nke ciment ahụ nwere otu ụgwọ ahụ (na-abụkarị ụgwọ na-adịghị mma), na-eme ka electrostatic repulsion, nke na-akwalite ibe ha. mgbasa nke akụkụ ciment na mbibi nke usoro flocculation. , na-ahapụ akụkụ nke mmiri a kpuchiri ekpuchi iji sonye na mmiri na-asọpụta, si otú ahụ na-amụba n'ụzọ dị irè nke mmiri nke ngwakọta ihe.
Otu hydrophilic dị n'imeonye na-ebelata mmiribụ nnọọ pola, otú ahụ mmiri na-ebelata gị n'ụlọnga adsorption film n'elu nke ciment ahụ nwere ike na-etolite a mụ solvated mmiri film na mmiri molekul. Ihe nkiri mmiri a nwere mmetụta mmanye mmanye dị mma ma nwee ike belata nguzogide na-amị amị n'etiti ihe simenti, si otú a na-emeziwanye mmiri nke ngwa agha na ihe.
The hydrophilic branched yinye nasuperplasticizerỌdịdị na-agbatị na mmiri mmiri ngwọta, si otú a akpụ a hydrophilic atọ akụkụ adsorption oyi akwa na ụfọdụ ọkpụrụkpụ n'elu nke adsorbed ciment ahụ. Mgbe akụkụ ciment dị nso na ibe ha, ọkwa mgbasa ozi na-amalite ịmalite, ya bụ, ihe mgbochi siri ike na-eme n'etiti akụkụ ciment. Ka ọ na-adabawanye, ka ọ na-awụ akpata oyi n'ahụ, ma na-enwekwu ihe mgbochi na njikọ dị n'etiti ciment irighiri, na-eme ka ngwa agha na ihe Slump na-anọgide na-adị mma.
N'oge usoro nkwadebe nkeihe na-ebelata mmiri polycarboxylate, A na-anyadokwa ụdọ ụfọdụ alaka alaka na ụmụ irighiri ihe na-ebelata mmiri. Nke a branched yinye ọ bụghị nanị na-enye steric mgbochi mmetụta, kamakwa, na elu alkalinity gburugburu ebe obibi nke ciment hydration, The alaka yinye nwekwara ike ji nwayọọ nwayọọ ebipụ, si otú na-ahapụ polycarboxylic acid na dispersing mmetụta, nke nwere ike melite dispersion mmetụta nke ciment ahụ. ịchịkwa slump ọnwụ.
Oge nzipu: Mar-29-2024