Thepa ea Sekhomaretsi sa Samente e Fetotsoeng ke Cellulose Ether

Ka ho lekanya thepa ea mochini, sekhahla sa ho boloka metsi, ho beha nako le mocheso oa hydration ea cellulose ether e nang le li-viscosities tse fapaneng ka litekanyetso tse fapaneng tsa peista ea samente, le ho sebelisa SEM ho sekaseka lihlahisoa tsa hydration, phello ea cellulose ether ts'ebetsong ea peista ea samente e ne e le. ithutiloe.molao oa tšusumetso.Liphetho li bonts'a hore tlatsetso ea cellulose ether e ka liehisa samente hydration, ho lieha ho thatafala ha samente le ho beha, ho fokotsa ho lokolloa ha mocheso oa hydration, ho lelefatsa nako ea ponahalo ea tlhoro ea mocheso oa hydration, 'me phello e liehang e eketseha ka keketseho ea litekanyetso le viscosity.Cellulose ether e ka eketsa tekanyo ea ho boloka metsi ea seretse, 'me e ka ntlafatsa ho boloka metsi a seretse ka sebopeho sa lera le tšesaane, empa ha litaba li feta 0.6%, ho eketseha ha phello ea ho boloka metsi ha ho bohlokoa;dikahare le viscosity ke lintlha tse khethollang selulose e fetotsoeng samente slurry.Tšebelisong ea seretse se fetotsoeng sa cellulose ether, litekanyetso le viscosity li lokela ho nahanoa haholo.

Mantsoe a bohlokoa:cellulose ether;tekanyetso;ho lieha;ho boloka metsi

Seretse sa kaho ke e 'ngoe ea thepa ea kaho e hlokahalang bakeng sa merero ea kaho.Lilemong tsa morao tjena, ka ts'ebeliso e kholo ea lisebelisoa tsa ho thibela marako le ntlafatso ea litlhoko tse khahlanong le ho phunyeha le ho thibela ho phunyeha ha marako bakeng sa marako a ka ntle, litlhoko tse phahameng li behiloe pele bakeng sa ho hanyetsa mapheo, ts'ebetso ea ho tlama le ts'ebetso ea kaho ea seretse.Ka lebaka la mefokolo ea shrinkage e kholo ea ho omisa, ho se khone ho kenella hantle, le matla a tlase a tlamahano, seretse sa setso hangata ha se khone ho fihlela litlhoko tsa kaho, kapa ho baka mathata a kang ho oa ha thepa ea mokhabiso.Joalo ka seretse sa plaster, hobane seretse se lahleheloa ke metsi ka potlako haholo, nako ea ho beha le ho thatafatsa e khutsufatsoa, ​​​​'me mathata a kang ho petsoha le sekoti a etsahala nakong ea kaho e kholo, e amang boleng ba morero haholo.Seretse sa setso se lahleheloa ke metsi ka potlako haholo 'me samente hydration ha e lekane, ho fella ka nako e khutšoanyane ea ho bula seretse sa samente, e leng senotlolo sa ho ama ts'ebetso ea seretse.

Cellulose ether e na le phello e ntle ea ho tiisa le ho boloka metsi, 'me e' nile ea sebelisoa haholo tšimong ea seretse, 'me e fetohile motsoako oa bohlokoa ho ntlafatsa ho boloka metsi a seretse le ho fana ka ts'ebetso ea kaho, ka katleho ho fokotsa mohaho le tšebeliso ea morao ea seretse sa setso. .Bothata ba ho lahleheloa ke metsi ka mokhoa o mahareng.Cellulose e sebelisoang ka seretse hangata e kenyelletsa methyl cellulose ether (MC), hydroxypropyl methyl cellulose (HPMC), hydroxyethyl methyl cellulose ether (HEMC), hydroxyethyl cellulose ether (HEC), joalo-joalo Har'a bona, HPMC le HEMC ke tsona tse sebelisoang ka ho fetisisa.

Pampiri ena haholo-holo e ithuta phello ea cellulose ether ka ho sebetsa (sekhahla sa ho boloka metsi, tahlehelo ea metsi le nako ea ho beha), thepa ea mochine (matla a khatello le matla a bond), molao oa hydration le microstructure ea peista ea samente.E fana ka ts'ehetso bakeng sa thepa ea cellulose ether e fetotsoeng samente peista 'me e fana ka litšupiso bakeng sa ts'ebeliso ea seretse se fetotsoeng sa cellulose ether.

1. Teko

1.1 Lisebelisoa tse tala

Samente: Samente e tloaelehileng ea Portland (PO 42.5) samente e hlahisoang ke Wuhan Yadong Cement Company, e nang le sebaka se itseng sa 3500 cm.²/g.

Cellulose ether: e fumanehang khoebong ea hydroxypropyl methylcellulose ether (MC-5, MC-10, MC-20, viscosities ea 50,000 Pa·S, 100000 Pa·S, 200000 Pa·S, ka ho latellana).

1.2 Mokhoa

Lisebelisoa tsa mechine: Ha ho etsoa sampuli, tekanyo ea cellulose ether ke 0.0% ~ 1.0% ea boima ba samente, 'me tekanyo ea metsi-samente ke 0.4.Pele o eketsa metsi le ho hlohlelletsa, kopanya ether ea cellulose le samente ka ho lekana.Peista ea samente e nang le mohlala oa boholo ba 40 x 40 x 40 e ile ea sebelisoa bakeng sa tlhahlobo.

Ho beha nako: Mokhoa oa ho lekanya o etsoa ho ea ka GB / T 1346-2001 "Cement Standard Consistency Water Consumption, Nako ea ho Beha, Mokhoa oa Teko oa Botsitso".

Ho boloka metsi: Teko ea ho boloka metsi a pente ea samente e bua ka mokhoa o tloaelehileng oa DIN 18555 "Mokhoa oa liteko oa seretse sa samente sa inorganic cementitious".

Mocheso oa metsi: Teko e nka TAM Air microcalorimeter ea TA Instrument Company ea United States, 'me karolelano ea samente ea metsi ke 0.5.

Sehlahisoa sa Hydration: Hlohlelletsa metsi le cellulose ether ka ho lekana, ebe u lokisa slurry ea samente, qala ho beha nako, nka lisampole ka linako tse fapaneng, emisa metsi ka ethanol e felletseng bakeng sa tlhahlobo, 'me tekanyo ea samente ea metsi ke 0.5.

2. Liphetho le lipuisano

2.1 Thepa ea mochini

Ho tloha tšusumetsong ea li-cellulose ether content ka matla, ho ka bonoa hore ka keketseho ea MC-10 cellulose ether content, matla a 3d, 7d le 28d kaofela a fokotseha;cellulose ether e fokotsa matla a 28d haholo.Ho tloha tšusumetsong ea cellulose ether viscosity ka matla, ho ka bonoa hore ebang ke cellulose ether e nang le viscosity ea 50,000 kapa 100,000 kapa 200,000, matla a 3d, 7d, le 28d a tla fokotseha.Hape ho ka bonoa hore cellulose ether Viscosity ha e na phello e kholo ho matla.

2.2 Ho beha nako

Ho tloha phello ea litaba tsa 100,000 viscosity cellulose ether ka nako ea ho beha, ho ka bonoa hore ka keketseho ea litaba tsa MC-10, nako ea ho beha nako ea pele le nako ea ho qetela ea ho beha e eketseha.Ha litaba li le 1%, nako ea pele ea ho beha E fihlile 510min, 'me nako ea ho qetela ea ho beha e fihlile 850min.Ha ho bapisoa le sekheo, nako ea pele ea ho beha e ile ea lelefatsoa ke 210min, 'me nako ea ho qetela ea ho beha e ne e lelefalitsoe ke 470min.

Ho tsoa tšusumetsong ea cellulose ether viscosity ka nako ea ho beha, ho ka bonoa hore ebang ke MC-5, MC-10 kapa MC-20, e ka lieha ho beha samente, empa ha e bapisoa le li-ether tse tharo tsa cellulose, boemo ba pele. nako le boemo ba ho qetela Nako e lelefala ka ho eketseha ha viscosity.Lebaka ke hobane cellulose ether e ka adsorbed holim'a likaroloana tsa samente, kahoo e thibela metsi ho kopana le likaroloana tsa samente, kahoo e liehisa samente hydration.Ha viscosity ea cellulose ether e le kholoanyane, e ba motenya oa lera la adsorption holim'a likaroloana tsa samente, 'me phello ea ho lieha e bohlokoa le ho feta.

2.3 Sekhahla sa ho boloka metsi

Ho tsoa molaong oa tšusumetso ea selulose ea ether ka sekhahla sa ho boloka metsi, ho ka bonoa hore ka keketseho ea litaba, sekhahla sa ho boloka metsi seretse se eketseha, 'me ha litaba tsa cellulose ether li feta 0.6%, sekhahla sa ho boloka metsi se ntse se eketseha. e tsitsitseng sebakeng.Leha ho le joalo, ho bapisa li-ether tse tharo tsa cellulose, ho na le phapang pakeng tsa tšusumetso ea viscosity ka tekanyo ea ho boloka metsi.Tlas'a tekanyo e tšoanang, kamano pakeng tsa sekhahla sa ho boloka metsi ke: MC-5≤MC-10≤MC-20.

2.4 Mocheso oa hydration

Ho tloha phello ea mofuta oa cellulose ether le dikahare mocheso oa hydration, ho ka bonoa hore ka keketseho ea litaba tsa MC-10, mocheso o feteletseng oa hydration o fokotseha butle-butle, 'me nako ea tlhōrō ea mocheso oa hydration e fetoha hamorao;Mocheso oa hydration le oona o bile le tšusumetso e kholo.Ka ho eketseha ha viscosity, mocheso oa hydration o ile oa fokotseha haholo, 'me tlhōrō ea mocheso oa hydration e ile ea fetoha haholo hamorao.E bontša hore cellulose ether e ka liehisa samente hydration, 'me phello ea eona ea ho thibela morao e amana le likahare le viscosity ea cellulose ether, e lumellanang le sephetho sa tlhahlobo ea nako ea ho beha nako.

2.5 Tlhahlobo ea lihlahisoa tsa hydration

Ho tsoa tlhahlobong ea SEM ea sehlahisoa sa 1d hydration, ho ka bonoa hore ha 0.2% MC-10 cellulose ether e eketsoa, ​​​​ho ka bonoa palo e kholo ea clinker e se nang metsi le ettringite e nang le crystallization e ntle e ka bonoang.%, likristale tsa ettringite li fokotsehile haholo, tse bontšang hore cellulose ether e ka liehisa hydration ea samente le ho thehoa ha lihlahisoa tsa hydration ka nako e le 'ngoe.Ka ho bapisa mefuta e meraro ea li-cellulose ethers, ho ka fumanoa hore MC-5 e ka etsa hore crystallization ea ettringite lihlahisoa tsa hydration e be tse tloaelehileng, 'me crystallization ea ettringite e tloaelehile haholoanyane.e amanang le botenya ba lera.

3. Qetello

a.Ho eketsoa ha cellulose ether ho tla liehisa hydration ea samente, ho liehisa ho thatafala le ho beha samente, ho fokotsa ho lokolloa ha mocheso oa hydration, le ho lelefatsa nako ea ponahalo ea tlhoro ea mocheso oa hydration.Ka keketseho ea litekanyetso le viscosity, phello ea ho khutlisa e tla eketseha.

b.Cellulose ether e ka eketsa sekhahla sa ho boloka metsi a seretse, 'me e ka ntlafatsa ho boloka metsi a seretse ka sebopeho sa lera le tšesaane.Ho boloka metsi a eona ho amana le litekanyetso le viscosity.Ha tekanyo e feta 0.6%, phello ea ho boloka metsi ha e eketsehe haholo.