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 mochine.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