Li-cellulose ethers, haholo-holo hydroxypropylmethylcellulose (HPMC) le methylhydroxyethylcellulose (MHEC), li 'nile tsa sebelisoa haholo e le li-additives tsa cementitious lisebelisoa tsa kaho. Li tsejoa ka thepa ea tsona ea ho boloka metsi, lisebelisoa tsena li ka ntlafatsa ts'ebetso, rheology le matla a tlamahano a thepa ea samente. Leha ho le joalo, tšusumetso ea bona ho hydration ea samente ha e hlake kamehla.
Cement hydration e bolela karabelo ea lik'hemik'hale pakeng tsa metsi le lisebelisoa tsa cementitious ho hlahisa lihlahisoa tsa hydration tse kang calcium silicate hydrate (CSH) le calcium hydroxide (Ca (OH) 2). Ts'ebetso ena e bohlokoa ho nts'etsopele ea matla le ho tšoarella ha konkreite.
Ho eketsoa ha li-cellulose ethers ho lisebelisoa tsa samente ho ka ba le litlamorao tse ntle le tse mpe ts'ebetsong ea hydration. Ka lehlakoreng le leng, ts'ebetso ea ho boloka metsi ea cellulose ether e ka khothaletsa samente hore e tsoele pele ho fumana metsi bakeng sa karabelo, ka hona e eketsa lebelo le tekanyo ea hydration. Sena se khutsufatsa nako ea ho beha, se potlakisa nts'etsopele ea matla le ho ntlafatsa thepa ea kakaretso ea konkreite.
Cellulose ether e ka boela ea sebetsa e le colloid e sireletsang ho thibela ho kopanya le ho rarolla likaroloana tsa samente. Sena se etsa hore ho be le microstructure e ts'oanang le e tsitsitseng, e leng ho ntlafatsang lisebelisoa tsa mechine le tse tšoarellang tsa konkreite.
Ka lehlakoreng le leng, tšebeliso e feteletseng ea cellulose ethers e ka ama hydration ea samente hampe. Hobane cellulose ether e na le hydrophobic ka mokhoa o itseng, e thibela ho kenella ha metsi ka har'a lisebelisoa tsa gelling, e leng se bakang ho lieha kapa ho se phethehe ha metsi. Sena se fella ka ho fokotseha ha matla le ho tšoarella ha konkreite.
Haeba motsoako oa cellulose ether o phahame haholo, o tla nka sebaka sa slurry ea samente e lokelang ho tlatsoa ka likaroloana tsa samente. Ka lebaka leo, kakaretso ea lintho tse tiileng tsa slurry e tla fokotseha, e leng se tla fella ka ho fokotseha ha thepa ea mechine. Li-cellulose ethers tse feteletseng li ka boela tsa sebetsa e le tšitiso, ho thibela ho sebelisana pakeng tsa likaroloana tsa samente le metsi, ho fokotsa ho fokotsa ts'ebetso ea hydration.
Ho bohlokoa ho tseba palo e nepahetseng ea cellulose ether eo u ka e sebelisang ho ntlafatsa thepa ea gelled ha u ntse u qoba tšusumetso efe kapa efe e mpe ho hydration. Chelete e itšetlehile ka lintlha tse ngata, tse kang mofuta oa cellulose ether, sebopeho sa samente, tekanyo ea metsi-samente le maemo a ho phekola.
Li-cellulose ethers, haholo-holo HPMC le MHEC, li ka ba le phello e ntle holim'a samente hydration, ho itšetlehile ka mahloriso a bona le sebopeho se khethehileng sa thepa ea samente. Palo ea cellulose ether e sebelisitsoeng e tlameha ho nahanoa ka hloko ho fihlela thepa e lakatsehang ntle le ho senya thepa ea konkreite. Ka tšebeliso e nepahetseng le ho ntlafatsa, li-cellulose ethers li ka kenya letsoho ho nts'etsopele ea thepa ea kaho e tšoarellang, e tšoarellang nako e telele le e tsitsitseng.
Nako ea poso: Aug-23-2023