Cellulose ether seretseng sa ho ikemela

Liphello tsahydroxypropyl methyl cellulose ethermabapi le metsi, ho boloka metsi le matla a tlamahano a seretse sa ho ikemela li ile tsa ithutoa. Liphetho li bonts'a hore HPMC e ka ntlafatsa ka nepo ho bolokoa ha metsi a seretse sa ho ikemela le ho fokotsa ho ts'oana ha seretse. Kenyelletso ea HPMC e ka ntlafatsa matla a tlamahano ea seretse, empa matla a ho hatella, matla a ho feto-fetoha le metsi a fokotsehile. Teko ea phapang ea SEM e ile ea etsoa ka lisampole, 'me phello ea HPMC ka phello ea ho lieha, ho boloka metsi le matla a seretse ho ile ha hlalosoa ka ho eketsehileng ho tloha tseleng ea hydration ea samente ka 3 le matsatsi a 28.

Mantsoe a bohlokoa:seretse sa ho ikemela; Cellulose ether; Mokelikeli; Ho boloka metsi

0. Selelekela

Seretse se ikemetseng se ka itšetleha ka boima ba sona ho theha motheo o bataletseng, o boreleli le o matla holim'a substrate, e le ho beha kapa ho tlama lisebelisoa tse ling, 'me o ka etsa sebaka se seholo sa kaho e phahameng, ka hona, metsi a phahameng ke a tšobotsi ea bohlokoa haholo ea seretse sa ho ikemela; Haholo-holo e le molumo o moholo, o matlafalitsoeng o teteaneng kapa lekhalo le ka tlaase ho 10 mm backfill kapa ho matlafatsa tšebeliso ea thepa ea grouting. Ho phaella ho metsi a matle, seretse sa ho itšehla thajana se tlameha ho ba le ho boloka metsi a itseng le matla a tlamahano, ho se be le ts'ebetso ea karohano ea mali, 'me e be le litšobotsi tsa adiabatic le ho phahama ha mocheso o tlase.

Ka kakaretso, seretse sa ho ikemela se hloka metsi a matle, empa metsi a sebele a slurry ea samente hangata ke 10 ~ 12 cm feela. Seretse se ikemetseng se ka ikemela, 'me nako ea pele ea ho beha e telele' me nako ea ho qetela ea ho beha e khutšoanyane. Cellulose ether ke e 'ngoe ea li-additives tse ka sehloohong tsa seretse se lokiselitsoeng, le hoja chelete ea ho eketsoa e le tlaase haholo, empa e ka ntlafatsa haholo ts'ebetso ea seretse, e ka ntlafatsa ho lumellana ha seretse, ts'ebetso ea ho sebetsa, ts'ebetso ea bonding le ts'ebetso ea ho boloka metsi, karolo ea bohlokoa haholo tšimong ea seretse se kopantsoeng hantle.

1. Lisebelisoa tse tala le mekhoa ea ho etsa lipatlisiso

1.1 Lisebelisoa tse tala

(1) Tloaelehileng P · O 42.5 grade samente.

(2) Lisebelisoa tsa lehlabathe: Xiamen e hlatsoitsoe lehlabathe la leoatle, boholo ba likaroloana ke 0.3 ~ 0.6mm, metsi a 1% ~ 2%, ho omisa ka maiketsetso.

(3) Cellulose ether: hydroxypropyl methyl cellulose ether ke sehlahisoa sa hydroxyl e nkeloa sebaka ke methoxy le hydroxypropyl, ka ho latellana, ka viscosity ea 300mpa·s. Hajoale, boholo ba cellulose ether e sebelisoang ke hydroxypropyl methyl cellulose ether le hydroxyethyl methyl cellulose ether.

(4) superplasticizer: polycarboxylic acid superplasticizer.

(5) Redispersible latex powder: HW5115 letoto le hlahisoang ke Henan Tiansheng Chemical Co., Ltd.

1.2 Mekhoa ea liteko

Teko e entsoe ho latela maemo a indasteri a JC/T 985-2005 "Self-leveling Mortar bakeng sa Tšebeliso ea fatše". Nako ea ho beha nako e ne e khethoa ka ho bua ka mokhoa o tloaelehileng le nako ea ho beha JC/T 727 samente peista. Sebopeho sa seretse se ikemetseng se etsa, ho khumama le teko ea matla a ho hatella e bua ka GB/T 17671. Mokhoa oa teko ea matla a tlamo: Setsi sa tlhahlobo ea seretse sa 80mmx80mmx20mm se lokiselitsoe esale pele, 'me lilemo tsa eona li fetile 28d. Bokaholimo boa kolobisoa, 'me metsi a mangata a ka holimo a hlakoloa ka mor'a ho koloba ka metsotso e 10. Sekhechana sa tlhahlobo ea seretse se tšeloa holim'a sebaka se bentšitsoeng ka boholo ba 40mmx40mmx10mm. Matla a bond a lekoa lilemong tsa moralo.

Scanning electron microscopy (SEM) e ne e sebelisetsoa ho hlahloba morphology ea lisebelisoa tse tiisitsoeng ka slurry. Thutong, mokhoa oa ho kopanya oa lisebelisoa tsohle tsa phofo ke: pele, lisebelisoa tsa phofo tsa karolo e 'ngoe le e' ngoe li kopantsoe ka mokhoa o ts'oanang, ebe li kenngoa metsing a reriloeng bakeng sa ho kopanya junifomo. Phello ea cellulose ether holim'a seretse se ikemetseng se ile sa hlahlojoa ka matla, ho boloka metsi, ho phalla ha metsi le liteko tsa microscopic tsa SEM.

2. Liphetho le tlhahlobo

2.1 Ho tsamaea

Cellulose ether e na le phello ea bohlokoa ho bolokeng metsi, ho ts'oana le ts'ebetso ea kaho ea seretse se ikemetseng. Haholo-holo joalo ka seretse sa ho ikemela, metsi ke e 'ngoe ea li-index tsa mantlha tsa ho lekola ts'ebetso ea seretse sa ho ikemela. Motheong oa ho netefatsa sebopeho se tloaelehileng sa seretse, mokelikeli oa seretse o ka fetoloa ka ho fetola litaba tsa cellulose ether.

Ka keketseho ea litaba tsa cellulose ether. Mokelikeli oa seretse o fokotseha butle-butle. Ha tekanyo e le 0.06%, metsi a seretse a fokotseha ka ho feta 8%, 'me ha tekanyo e le 0.08%, metsi a fokotseha ka ho feta 13.5%. Ka nako e ts'oanang, ka ho atolosoa ha lilemo, tekanyo e phahameng e bontša hore palo ea cellulose ether e tlameha ho laoloa ka har'a mefuta e itseng, tekanyo e phahameng haholo e tla tlisa liphello tse mpe ho mokelikeli oa seretse. Metsi le samente seretseng li etsa seretse se hloekileng ho tlatsa lekhalo la lehlabathe, le ho phuthela lehlabatheng ho phetha karolo ea ho tlotsa, e le hore seretse se be le mokelikeli o itseng. Ka ho kenyelletsoa ha cellulose ether, litaba tsa metsi a sa lefelloeng tsamaisong li fokotsehile, 'me lera la ho roala leboteng le ka ntle la lehlabathe le fokotsehile, kahoo ho fokotsa ho phalla ha seretse. Ka lebaka la tlhokahalo ea seretse se ikemetseng se nang le metsi a mangata, palo ea cellulose ether e lokela ho laoloa ka mokhoa o lekaneng.

2.2 Poloko ea Metsi

Ho boloka metsi a seretse ke index ea bohlokoa ea ho lekanya botsitso ba likarolo tsa seretse se sa tsoa tsoakoa sa samente. Ho eketsa palo e loketseng ea cellulose ether ho ka ntlafatsa ho boloka metsi a seretse. E le ho etsa hore karabelo ea hydration ea thepa ea samente e be ka botlalo, palo e lekaneng ea cellulose ether e ka boloka metsi ka seretse nako e telele ho etsa bonnete ba hore karabelo ea hydration ea thepa ea samente e ka etsoa ka botlalo.

Cellulose ether e ka sebelisoa e le ntho e bolokang metsi hobane liathomo tsa oksijene holim'a li-bond tsa hydroxyl le ether li amahanngoa le limolek'hule tsa metsi ho etsa li-hydrogen bond, ho etsa hore metsi a sa lefelloeng e be metsi a kopantsoeng. E ka bonoa ho tsoa kamanong pakeng tsa litaba tsa cellulose ether le sekhahla sa ho boloka metsi seretse hore sekhahla sa ho boloka metsi seretse se eketsehe ka keketseho ea litaba tsa cellulose ether. Phello ea ho boloka metsi ea cellulose ether e ka thibela substrate hore e se ke ea monya metsi a mangata haholo le ka potlako, le ho thibela ho fetoha mouoane oa metsi, kahoo ho etsa bonnete ba hore tikoloho ea slurry e fana ka metsi a lekaneng bakeng sa samente hydration. Hape ho na le liphuputso tse bontšang hore ho phaella ho palo ea cellulose ether, viscosity ea eona (boima ba molek'hule) e boetse e na le tšusumetso e kholo ea ho boloka metsi a seretse, ho ba le viscosity e kholo, ho molemo ho boloka metsi. Cellulose ether e nang le viscosity ea 400 MPa·S hangata e sebelisoa bakeng sa seretse sa ho ikemela, se ka ntlafatsang ts'ebetso ea seretse le ho ntlafatsa ho kopana ha seretse. Ha viscosity e feta 40000 MPa·S, ts'ebetso ea ho boloka metsi ha e sa ntlafala haholo, 'me ha e tšoanelehe bakeng sa seretse sa ho iketsetsa.

Thutong ena, ho ile ha nkoa mehlala ea seretse se nang le cellulose ether le seretse se se nang cellulose ether. Karolo ea disampole e ne e le disampole tsa lilemo tsa 3d, 'me karolo e' ngoe ea lisampole tsa lilemo tsa 3d li ne li phekoloa ka mokhoa o tloaelehileng bakeng sa 28d, 'me joale ho thehoa ha lihlahisoa tsa samente hydration ka lisampole ho ile ha lekoa ke SEM.

Lihlahisoa tsa hydration tsa samente ka mohlala o se nang letho oa sampole ea seretse lilemong tsa 3d li feta tse ka har'a sampole e nang le selulose ether, 'me lilemong tsa 28d, lihlahisoa tsa hydration tsa sampole e nang le selulose ether li ngata haholo ho feta tsa sampole e se nang letho. Ho kenngoa ha metsi pele ho nako hoa lieha hobane ho na le lera le rarahaneng la filimi le entsoeng ke cellulose ether holim'a likaroloana tsa samente qalong. Leha ho le joalo, ka ho atolosoa ha lilemo, ts'ebetso ea hydration e tsoela pele butle. Ka nako ena, ho boloka metsi a cellulose ether holim'a slurry ho etsa hore ho be le metsi a lekaneng ka har'a slurry ho finyella tlhokahalo ea hydration reaction, e leng se loketseng tsoelo-pele e feletseng ea hydration reaction. Ka hona, ho na le lihlahisoa tse ngata tsa hydration ho slurry nakong ea morao-rao. Ha re bua, ho na le metsi a mangata a mahala ka har'a sampole e se nang letho, e ka khotsofatsang metsi a hlokoang ke karabelo ea pele ea samente. Leha ho le joalo, ka tsoelo-pele ea ts'ebetso ea hydration, karolo ea metsi a sampoleng e jeoa ke karabelo ea pele ea hydration, 'me karolo e' ngoe e lahleheloa ke mouoane, e leng se bakang metsi a sa lekaneng ho slurry hamorao. Ka hona, lihlahisoa tsa 3d hydration ka sampole e se nang letho li batla li le ngata. Palo ea lihlahisoa tsa hydration e tlase haholo ho palo ea lihlahisoa tsa hydration ka sampuling e nang le cellulose ether. Ka hona, ho ea ka pono ea lihlahisoa tsa hydration, ho boetse ho hlalosoa hore ho eketsa palo e loketseng ea cellulose ether ho seretse ka sebele ho ka ntlafatsa ho boloka metsi a slurry.

2.3 Ho beha nako

Cellulose ether e na le phello e itseng e sitisang seretse, ka keketseho ea selulose ether. Joale nako ea ho beha seretse e lelefalitsoe. Phello e fokolisang ea cellulose ether e amana ka kotloloho le litšobotsi tsa eona tsa sebopeho. Cellulose ether e na le sebopeho sa selikalikoe sa tsoekere se senyehileng, se ka etsang heke e rarahaneng ea limolek'hule tsa tsoekere e nang le li-ion tsa calcium ka har'a tharollo ea samente ea hydration, e fokotsa bongata ba li-ion tsa calcium nakong ea samente ea hydration, ho thibela sebopeho le pula ea Ca (OH) 2 le letsoai la calcium. likristale, e le ho liehisa ts'ebetso ea hydration ea samente. Phello e fokolisang ea cellulose ether holim'a seretse sa samente haholo-holo e itšetlehile ka tekanyo ea ho nkela sebaka sa alkyl 'me e na le kamano e fokolang le boima ba molek'hule. Ha tekanyo ea sebaka sa alkyl e le nyane, litaba tsa hydroxyl li le kholoanyane, phello ea ho lieha e bonahala haholoanyane. L. Semitz le ba bang. o ne a lumela hore limolek'hule tsa cellulose ether li ne li adsorbed haholo lihlahisoa tsa hydration tse kang C - S - H le Ca (OH) 2, 'me li ne li sa adsorbed ho liminerale tsa pele tsa clinker. Ha e kopantsoe le tlhahlobo ea SEM ea ts'ebetso ea samente ea hydration, ho fumanoa hore cellulose ether e na le phello e itseng ea ho lieha, 'me ha litaba tsa cellulose ether li phahame, ho hlakile haholoanyane phello e fokolisang ea lera le rarahaneng la filimi ho qala ho phalla ha samente, ka hona, e hlakileng haholoanyane phello ea ho lieha.

2.4 Matla a Flexural le matla a hatellang

Ka kakaretso, matla ke e 'ngoe ea lintlha tsa bohlokoa tsa tlhahlobo ea lisebelisoa tsa samente tse thehiloeng ho samente tse phekolang metsoako. Ntle le ts'ebetso e phahameng ea phallo, seretse sa ho ikemela le sona se lokela ho ba le matla a itseng a khatello le matla a feto-fetohang. Thutong ena, matla a khatello ea matsatsi a 7 le a 28 le matla a flexural a seretse se se nang letho se kopantsoeng le cellulose ether e ile ea lekoa.

Ka keketseho ea li-cellulose ether content, matla a khatello ea seretse le matla a flexural a fokotsehile ka amplitude e fapaneng, litaba li nyenyane, tšusumetso ea matla ha e totobetse, empa ka litaba tse fetang 0.02%, kholo ea tahlehelo ea matla e bonahala haholoanyane. , ka hona, ha ho sebelisoa cellulose ether ho ntlafatsa ho boloka metsi a seretse, empa hape ho nahanela phetoho ea matla.

Lisosa tsa khatello ea seretse le matla a flexural a fokotseha. E ka sekasekiwa go tswa mo matlhakoreng a a latelang. Pele ho tsohle, matla a pele le samente e thatafatsang ka potlako ha ea ka ea sebelisoa thutong. Ha seretse se omeletseng se kopantsoe le metsi, likaroloana tse ling tsa phofo ea rabara ea cellulose ether li ile tsa qala ho phatlalatsoa holim'a likaroloana tsa samente ho etsa filimi ea latex, e ileng ea liehisa ho phalla ha samente le ho fokotsa matla a pele a matrix a seretse. Taba ea bobeli, molemong oa ho etsisa tikoloho ea ts'ebetso ea ho lokisa seretse sa ho ikemela setšeng, mehlala eohle ea boithuto ha ea ka ea sisinyeha ha e ntse e lokisoa le ho bopa, 'me e its'etlehile ka ho ipapisa le boima ba 'mele. Ka lebaka la ts'ebetso e matla ea ho boloka metsi ea cellulose ether ka seretse, palo e kholo ea li-pores e ile ea sala ka har'a matrix ka mor'a ho thatafala ha seretse. Keketseho ea porosity ka seretse hape ke lebaka la bohlokoa bakeng sa ho fokotseha ha matla a ho hatella le a flexural a seretse. Ho phaella moo, ka mor'a ho kenya ether ea cellulose ka seretse, litaba tsa polymer e feto-fetohang ka har'a likoti tsa seretse lia eketseha. Ha matrix e hatelloa, polymer e feto-fetohang e thata ho bapala karolo e thata ea ho tšehetsa, e amang le ts'ebetso ea matla ea matrix ho isa tekanyong e itseng.

2.5 Matla a tlamahano

Cellulose ether e na le phello e kholo ho thepa ea tlamahano ea seretse 'me e sebelisoa haholo ho etsa lipatlisiso le ho lokisa seretse sa ho ikemela.

Ha litaba tsa cellulose ether li pakeng tsa 0.02% le 0.10%, matla a tlamahano ea seretse a ntlafatsoa ka ho hlakileng, 'me matla a tlamahano ka matsatsi a 28 a phahame haholo ho feta matsatsi a 7. Cellulose ether e etsa filimi e koetsoeng ea polymer pakeng tsa likaroloana tsa samente hydration le tsamaiso ea mokelikeli, e khothalletsang metsi a mangata ka filimi ea polymer ka ntle ho likaroloana tsa samente, e leng se loketseng ho hydration e feletseng ea samente, e le ho ntlafatsa matla a tlamahano ea peista. ka mora ho thatafala. Ka nako e ts'oanang, tekanyo e nepahetseng ea cellulose ether e ntlafatsa polasetiki le ho fetoha ha seretse, e fokotsa ho tiea ha sebaka sa phetoho pakeng tsa seretse le substrate interface, e fokotsa khatello ea kelello pakeng tsa sebopeho, 'me e ntlafatsa phello ea tlamahano pakeng tsa seretse le substrate. tekanyo e itseng. Ka lebaka la boteng ba cellulose ether ka slurry ea samente, sebaka se khethehileng sa phetoho ea sefahleho le lera la sefahleho li thehoa pakeng tsa likaroloana tsa seretse le lihlahisoa tsa hydration. Lera lena le kopaneng le etsa hore sebaka sa phetoho ea sefahleho se tenyetsehe le ho se tsitsinyehe, e le hore seretse se be le matla a maqhama a matla.

3. Qetello le Puisano

Cellulose ether e ka ntlafatsa ho bolokoa ha metsi a seretse se ikemetseng. Ka keketseho ea palo ea cellulose ether, ho boloka metsi a seretse ho ntlafatsoa butle-butle, 'me metsi a seretse le nako ea ho beha li fokotsehile ho isa tekanyong e itseng. Ho boloka metsi a mangata haholo ho tla eketsa porosity ea slurry e thata, e ka etsang hore matla a khatello le a feto-fetohang a seretse se thata a be le tahlehelo e totobetseng. Phuputsong, matla a fokotsehile haholo ha litekanyetso li ne li le pakeng tsa 0.02% le 0.04%, 'me ha palo ea cellulose ether e ntse e eketseha, ho hlakile haholoanyane phello ea ho lieha. Ka hona, ha u sebelisa cellulose ether, ho boetse hoa hlokahala hore u nahane ka botlalo ka thepa ea mochine oa seretse se ikemetseng, khetho e utloahalang ea litekanyetso le phello ea synergistic pakeng tsa eona le lisebelisoa tse ling tsa lik'hemik'hale.

Tšebeliso ea cellulose ether e ka fokotsa matla a khatello le matla a flexural a slurry ea samente, le ho ntlafatsa matla a ho kopanya a seretse. Tlhahlobo ea mabaka a phetoho ea matla, haholo-holo e bakoang ke phetoho ea lihlahisoa tse nyenyane le sebopeho, ka lehlakoreng le leng, selulose ether rabara phofo particles pele adsorbed holim'a likaroloana tsa samente, ho thehoa ha filimi latex, lieha hydration. samente, e tla etsa hore ho lahleheloa ke matla a pele a slurry; Ka lehlakoreng le leng, ka lebaka la phello ea ho etsa filimi le phello ea ho boloka metsi, e thusa ho hydration e feletseng ea samente le ntlafatso ea matla a tlamahano. Sengoli se lumela hore mefuta ena e 'meli ea liphetoho tsa matla e teng haholo moeling oa nako ea ho beha, mme tsoelo-pele le ho lieha ha moeli ona e ka ba ntlha ea bohlokoa e bakang boholo ba mefuta e' meli ea matla. Boithuto bo tebileng le bo hlophisehileng ba ntlha ena ea bohlokoa bo tla thusa ho laola hantle le ho hlahloba ts'ebetso ea hydration ea thepa e tiisitsoeng ka har'a slurry. Hoa thusa ho lokisa palo ea cellulose ether le ho phekola nako ho latela tlhoko ea thepa ea mochini oa seretse, e le ho ntlafatsa ts'ebetso ea seretse.