Litšebelisano tsa lik'hemik'hale lipakeng tsa HPMC le lisebelisoa tsa samente

Hydroxypropyl methylcellulose (HPMC) ke selulose ether e sebelisoang haholo linthong tsa kaho ka lebaka la thepa ea eona e ikhethang joalo ka ho boloka metsi, bokhoni ba ho tenya, le ho khomarela. Lits'ebetsong tsa cementitious, HPMC e sebeletsa merero e fapaneng, ho kenyelletsa ho ntlafatsa ts'ebetso, ho ntlafatsa ho khomarela, le ho laola ts'ebetso ea hydration.

Thepa ea samente e bapala karolo ea bohlokoa kahong, e fana ka mokokotlo bakeng sa lits'ebetso tse fapaneng tsa meaho. Lilemong tsa morao tjena, ho bile le thahasello e ntseng e hola ea ho fetola litsamaiso tsa cementitious ho fihlela litlhoko tse ikhethileng tsa ts'ebetso, joalo ka ts'ebetso e matlafalitsoeng, ho tšoarella ha nako e telele le ho fokotsa tšusumetso ea tikoloho. Hydroxypropyl methylcellulose (HPMC) ke e 'ngoe ea li-additives tse sebelisoang hangata mefuteng ea samente ka lebaka la thepa ea eona e fapaneng le ho lumellana le samente.

1.Properties of Hydroxypropyl Methylcellulose (HPMC)

HPMC ke cellulose ether e nkiloeng ho selulose ea tlhaho ka phetoho ea lik'hemik'hale. E na le thepa e 'maloa e lakatsehang bakeng sa lits'ebetso tsa kaho, ho kenyelletsa:

Ho boloka metsi: HPMC e khona ho monya le ho boloka metsi a mangata, a thusang ho thibela ho tsoa mouoane ka potlako le ho boloka maemo a nepahetseng a hydration lits'ebetsong tsa samente.

Bokhoni ba ho tiisa: HPMC e fana ka viscosity ho metsoako ea samente, ho ntlafatsa ts'ebetso ea bona le ho fokotsa karohano le mali.
Ho khomarela: HPMC e ntlafatsa ho khomarela lisebelisoa tsa cementitious ho li-substrates tse fapaneng, e leng se lebisang ho matla a matle a ntlafetseng le ho tšoarella.
Botsitso ba lik'hemik'hale: HPMC e hanyetsana le ho senyeha ha lik'hemik'hale libakeng tsa alkaline, e leng ho etsang hore e tšoanelehe ho sebelisoa lits'ebetsong tse thehiloeng ho samente.

2.Litšebelisano tsa Lik'hemik'hale Pakeng tsa HPMC le Lisebelisoa tsa Cementitious

Litšebelisano lipakeng tsa HPMC le lisebelisoa tsa cementitious li etsahala maemong a mangata, ho kenyeletsoa papatso ea 'mele, karabelo ea lik'hemik'hale, le liphetoho tsa microstructural. Litšebelisano tsena li susumetsa hydration kinetics, nts'etsopele ea microstructure, thepa ea mochine, le ho tšoarella ha metsoako ea cementitious e hlahisoang.

3.Mele ea Adsorption

Limolek'hule tsa HPMC li ka ikemela holim'a likaroloana tsa samente ka hydrogen bonding le matla a Van der Waals. Ts'ebetso ena ea adsorption e susumetsoa ke lintlha tse kang sebaka se ka holimo le tefiso ea likaroloana tsa samente, hammoho le boima ba limolek'hule le mahloriso a HPMC ka tharollo. Phatlalatso ea 'mele ea HPMC e thusa ho ntlafatsa phallo ea likaroloana tsa samente metsing, e lebisang ho ts'ebetsong e ntlafetseng le ho fokotsa tlhokahalo ea metsi ka har'a metsoako ea samente.

4.Karabelo ea Lik'hemik'hale

HPMC e ka ba le liphetoho tsa lik'hemik'hale ka likarolo tsa thepa ea samente, haholo-holo ka li-ion tsa calcium tse lokollotsoeng nakong ea hydration ea samente. Lihlopha tsa hydroxyl (-OH) tse teng ka har'a limolek'hule tsa HPMC li ka sebetsana le li-ion tsa calcium (Ca2 +) ho etsa li-calcium complexes, tse ka tlatsetsang ho beha le ho thatafatsa tsamaiso ea cementitious. Ho feta moo, HPMC e ka sebelisana le lihlahisoa tse ling tsa samente tsa hydration, tse kang calcium silicate hydrates (CSH), ka hydrogen bonding le mekhoa ea phapanyetsano ea ion, e susumetsang microstructure le thepa ea mechine ea pente e thata ea samente.

5.Liphetoho tse nyenyane

Ho ba teng ha HPMC lits'ebetsong tsa cementitious ho ka etsa hore ho be le liphetoho tsa sebopeho sa microstructural, ho kenyelletsa le liphetoho sebopeho sa pore, kabo ea boholo ba pore, le morphology ea lihlahisoa tsa hydration. Limolek'hule tsa HPMC li sebetsa joalo ka li-filler tsa pore le libaka tsa nucleation bakeng sa lihlahisoa tsa hydration, tse lebisang ho li-microstructures tse teteaneng tse nang le li-pores tse ntle le kabo e tšoanang ea lihlahisoa tsa hydration. Liphetoho tsena tsa microstructural li kenya letsoho ho ntlafatseng thepa ea mochine, e kang matla a ho hatella, matla a ho feto-fetoha le nako e telele, ea thepa ea samente e fetotsoeng ea HPMC.

6.Liphello ho Thepa le Ts'ebetso

Litšebelisano tsa lik'hemik'hale lipakeng tsa HPMC le lisebelisoa tsa samente li na le litlamorao tse kholo meahong le ts'ebetsong ea lihlahisoa tse thehiloeng ho samente. Liphello tsena li kenyelletsa:

7. Ntlafatso ea ho sebetsa

HPMC e ntlafatsa ho sebetsa ha metsoako ea cementitious ka

ho fokotsa tlhokahalo ea metsi, ho matlafatsa momahano, le ho laola ho tsoa mali le karohano. Botenya le thepa ea ho boloka metsi ea HPMC e lumella ho phalla hantle le ho pompa ha metsoako ea konkreite, ho nolofatsa ts'ebetso ea kaho le ho fihlela liphetho tse lakatsehang tsa bokaholimo.

8.Taolo ea Hydration Kinetics

HPMC e susumetsa hydration kinetics ea litsamaiso tsa cementitious ka ho laola ho fumaneha ha metsi le li-ion, hammoho le nucleation le kholo ea lihlahisoa tsa hydration. Ho ba teng ha HPMC ho ka sitisa kapa ho potlakisa ts'ebetso ea hydration ho latela lintlha tse kang mofuta, mahloriso, le boima ba limolek'hule tsa HPMC, hammoho le maemo a ho folisa.

9. Ntlafatso ea Thepa ea Mechini

Thepa ea samente e fetotsoeng ke HPMC e bonts'a thepa e ntlafalitsoeng ea mochini ha e bapisoa le lits'ebetso tse thehiloeng ho samente. Liphetoho tsa microstructural tse hlahisitsoeng ke HPMC li etsa hore ho be le matla a phahameng a khatello, matla a ho feto-fetoha ha maemo, le ho tiea, hammoho le ho ntlafatsa ho hanyetsa ho phunyeha le ho senyeha ha tlas'a mojaro.

10.Ho ntlafatsa ho tšoarella

HPMC e ntlafatsa ho tšoarella ha lisebelisoa tsa samente ka ho ntlafatsa ho hanyetsa ha tsona mekhoa e fapaneng ea ho senyeha, ho kenyelletsa le lipotoloho tsa leqhoa, tlhaselo ea lik'hemik'hale le carbonation. The microstructure e teteaneng le ho fokotsehile ho kenella ha litsamaiso tsa samente tse fetotsoeng tsa HPMC li kenya letsoho ho eketseheng ho hanyetsang ho kenella ha lintho tse senyang le bophelo bo bolelele ba tšebeletso.

Hydroxypropyl methylcellulose (HPMC) e bapala karolo ea bohlokoa ho lokiseng thepa le tšebetso ea thepa ea samente ka ho sebelisana ha lik'hemik'hale le likarolo tsa samente. Phatlalatso ea 'mele, karabelo ea lik'hemik'hale, le liphetoho tsa microstructural tse susumetsoang ke HPMC li susumetsa ts'ebetso, hydration kinetics, thepa ea mochini, le ho tšoarella ha lihlahisoa tse thehiloeng ho samente. Ho utloisisa litšebelisano tsena ho bohlokoa bakeng sa ho ntlafatsa tlhahiso ea thepa ea samente e fetotsoeng ea HPMC bakeng sa lits'ebetso tse fapaneng tsa kaho, ho tloha ho konkreite e tloaelehileng ho isa ho lirekere tse khethehileng le li-grouts. Ho hlokahala lipatlisiso tse ling ho hlahloba mekhoa e rarahaneng e thehiloeng ho tšebelisano lipakeng tsa HPMC le lisebelisoa tsa samente le ho theha li-additives tse tsoetseng pele tse thehiloeng ho HPMC tse nang le thepa e etselitsoeng litlhoko tse ikhethang tsa kaho.