A na-eji cellulose ethers, karịsịa hydroxypropylmethylcellulose (HPMC) na methylhydroxyethylcellulose (MHEC), mee ihe dị ka ihe mgbakwunye cementitious na ngwa owuwu. N'ịbụ ndị a maara maka ihe ndị na-ejigide mmiri ha, ihe ndị a nwere ike ime ka arụ ọrụ, rheology na ike njikọ nke ihe cimenti. Otú ọ dị, mmetụta ha na hydration ciment adịghị apụta ìhè mgbe niile.
Mmiri ciment na-ezo aka na mmeghachi omume kemịkal dị n'etiti mmiri na ihe cimentious iji mepụta ngwaahịa hydration dị ka calcium silicate hydrate (CSH) na calcium hydroxide (Ca (OH) 2). Usoro a dị oke mkpa maka mmepe nke ike igwe na ịdịte aka.
Mgbakwunye nke cellulose ethers na ihe cimenti nwere ike inwe mmetụta dị mma na nke na-adịghị mma na usoro hydration. N'otu aka ahụ, ọrụ njigide mmiri nke cellulose ether nwere ike ịkwalite ciment ka ọ nọgide na-enweta mmiri maka mmeghachi omume, si otú ahụ na-abawanye ọsọ ọsọ na ogo hydration. Nke a na-ebelata oge mwube, na-eme ka mmepe ike dịkwuo elu ma na-eme ka njirimara zuru oke nke ihe ahụ dị mma.
Cellulose ether nwekwara ike ime dị ka colloid na-echebe iji gbochie nchịkọta na nhazi nke simenti. Nke a na-ebute microstructure na-edobe anya na nke kwụsiri ike, nke na-eme ka ihe ndị na-arụ ọrụ na-arụ ọrụ na-adịgide adịgide nke kọnkịrị.
N'aka nke ọzọ, iji cellulose ethers na-emebiga ihe ókè nwere ike imetụta hydration ciment na-adịghị mma. N'ihi na ether cellulose bụ akụkụ nke hydrophobic, ọ na-egbochi ntinye mmiri n'ime ihe gelling, na-ebute hydration na-egbu oge ma ọ bụ ezughị ezu. Nke a na-ebute mbelata ike na ịdịte aka nke ihe ahụ.
Ọ bụrụ na ntinye nke cellulose ether dị oke elu, ọ ga-etinye ohere na slurry ciment nke ga-ejupụta na cement. N'ihi ya, mkpokọta ihe siri ike nke slurry ga-ebelata, na-eme ka ihe ndị na-arụ ọrụ na-ebelata. Ethers cellulose karịrị akarị nwekwara ike ime dị ka ihe mgbochi, na-egbochi mmekọrịta dị n'etiti cement particles na mmiri, na-eme ka usoro hydration na-ebelata.
Ọ dị mkpa iji chọpụta ọnụọgụ cellulose ether kacha mma iji mee ka njirimara nke ihe gelled dị mma ma na-ezere mmetụta ọjọọ ọ bụla na hydration. Ọnụ ego ahụ na-adabere n'ọtụtụ ihe, dị ka ụdị cellulose ether, ihe mejupụtara ciment, mmiri-ciment ratio na ọnọdụ ọgwụgwọ.
Cellulose ethers, karịsịa HPMC na MHEC, nwere ike inwe mmetụta dị mma na ciment hydration, dabere na ntinye ha na kpọmkwem ihe mejupụtara nke cimenti. A ghaghị iji nlezianya tụlee ọnụ ọgụgụ cellulose ether eji eme ihe iji nweta ihe ndị a na-achọsi ike n'emebighị ihe ndị dị na kọmpụta. Site n'iji ya eme ihe nke ọma na njikarịcha ya, cellulose ethers nwere ike inye aka na mmepe nke ihe owuwu na-adịgide adịgide, na-adịte aka ma na-adịgide adịgide.
Oge nzipu: Ọgọst-23-2023