I-Cellulose Ether Viscosity Shintsha Kusimende osekelwe kusimende

Ukuqina kuwumphumela obalulekile wokuguqula we-cellulose ether ezintweni ezisekelwe kusimende. Imiphumela yokuqukethwe kwe-cellulose ether, isivinini sokujikeleza kwe-viscometer kanye nezinga lokushisa ekushintsheni kwe-viscosity ye-cellulose ether eshintshiwe usimendei-plaster esekelwe zafundwa. Imiphumela ibonisa ukuthi i-viscosity kasimendei-plaster esekelwe ikhula ngokuqhubekayo ngokwanda kokuqukethwe kwe-cellulose ether, kanye ne-viscosity yesisombululo se-cellulose ether kanye nosimende.i-plaster esekelwe ine "composite superposition effect"; i-pseudoplasticity ye-cellulose ether eshintshiwe usimendei-plaster esekelwe ingaphansi kukasimende omsulwai-plaster esekelwe, kanye ne-viscosity Yehlisa isivinini sokuzungeza sensimbi, noma inciphisa i-viscosity ye-cellulose ether usimende oguquliwei-plaster esekelwe, noma ukuncipha kokuqukethwe kwe-cellulose ether, kuba sobala kakhulu i-pseudoplasticity ye-cellulose ether eshintshiwe usimendei-plaster esekelwe; Ngomphumela ohlangene we-hydration, i-viscosity ye-cellulose ether eshintshiwe usimendei-plaster esekelwe izokwanda noma yehle. Izinhlobo ezahlukene ze-cellulose ether zinezinguquko ezihlukene ku-viscosity ye-cement eguquliwei-plaster esekelwe.

Amagama angukhiye: i-cellulose ether; usimendei-plaster esekelwe; i-viscosity

0,Isandulelo

Ama-cellulose ethers avame ukusetshenziswa njengama-ejenti okugcina amanzi kanye nama-thickeners wezinto ezisekelwe kusimende. Ngokusho kwama-substitutes ahlukene, ama-cellulose ether asetshenziswa ezintweni ezisekelwe kusimende ngokuvamile ahlanganisa i-methyl cellulose (MC), i-hydroxyethyl cellulose (HEC), i-hydroxyethyl methyl cellulose Ether (Hydroxyethyl methyl cellulose, HEMC) kanye ne-hydroxypropyl methyl cellulose (Hydroxypropyl methylMC cellulose), phakathi kwazo i-HPMC ne-HEMC asetshenziswa kakhulu.

Ukuqina kuwumphumela obalulekile wokuguqula we-cellulose ether ezintweni ezisekelwe kusimende. I-Cellulose ether inganikeza udaka olumanzi nge-viscosity enhle kakhulu, ikhulise ngokuphawulekayo ikhono lokubopha phakathi kodaka olumanzi kanye nongqimba oluyisisekelo, futhi ithuthukise ukusebenza kwe-anti-sag yodaka. Kungase futhi kukhuphule i-homogeneity kanye nekhono lokulwa nokuhlakazeka kwezinto ezisanda kuxutshwa esekwe usimende, futhi kuvimbele ukuhlukaniswa, ukuhlukaniswa kanye nokopha kodaka nokhonkolo.

Umthelela wokujiya we-cellulose ether ezintweni ezisekelwe kusimende ungahlolwa ngokwesilinganiso ngemodeli ye-rheological yezinto ezisekelwe kusimende. Izinto ezisekelwe ku-cement zivame ukubhekwa njenge-Bingham fluid, okungukuthi, lapho ukucindezeleka kwe-shear esetshenzisiwe r kungaphansi kokucindezeleka kwesivuno r0, impahla ihlala isesimweni sayo sokuqala futhi ayigelezi; lapho ukucindezeleka kwe-shear r kudlula ukucindezeleka kwesivuno r0, into idlula ukugeleza kokugeleza, kanye nokucindezeleka kwe-shear Ukucindezeleka r kunobudlelwane bomugqa nesilinganiso sobunzima y, okungukuthi, r=r0+f·y, lapho f kuyi-viscosity yepulasitiki. Ama-cellulose ether ngokuvamile akhulisa ukucindezeleka kwesivuno kanye ne-viscosity yepulasitiki yezinto ezisekelwe kusimende, nokho, imithamo ephansi iholela ekucindezelekeni kwesivuno esiphansi kanye ne-plastic viscosity, ikakhulukazi ngenxa yomphumela wokungenisa umoya we-cellulose ethers. Ucwaningo lukaPatural lubonisa ukuthi isisindo samangqamuzana e-cellulose ether siyakhula, ukucindezeleka kwesivuno sikasimende.i-plaster esekelwe kuncipha, futhi ukuhambisana kuyanda.

I-viscosity kasimendei-plaster esekelwe iyinkomba ebalulekile yokuhlola umphumela wokujiya we-cellulose ether ezintweni ezisekelwe kusimende. Ezinye izincwadi zihlole umthetho wokushintsha i-viscosity wesixazululo se-cellulose ether, kodwa kusenokuntuleka kocwaningo olufanele mayelana nomphumela we-cellulose ether ekushintsheni kwe-viscosity kasimende.i-plaster esekelwe. Ngesikhathi esifanayo, ngokusho kwezinhlobo ezahlukene zama-substituents, kunezinhlobo eziningi ze-cellulose ethers. Umthelela wezinhlobo ezahlukene nama-viscosities we-cellulose ethers ekushintsheni kukasimendei-plaster esekelwe i-viscosity nayo iyinkinga ekhathazeke kakhulu ekusetshenzisweni kwe-cellulose ethers. Lo msebenzi usebenzisa i-viscometer ejikelezayo ukutadisha izinguquko ze-viscosity ze-cellulose ether eziguquguqukayo ze-cement slurries zezinhlobo ezahlukene nama-viscosity ngaphansi kwezilinganiso ezahlukene ze-poly-ash, isivinini sokujikeleza kanye namazinga okushisa.

1. Isivivinyo

1.1 Izinto ezisetshenziswayo

(1) I-cellulose ether. Izinhlobo eziyisithupha ze-cellulose ethers ezivame ukusetshenziswa ezweni lami zikhethiwe, okuhlanganisa uhlobo olulodwa lwe-MC, uhlobo olu-1 lwe-HEC, izinhlobo ezi-2 ze-HPMC kanye nezinhlobo ezi-2 ze-HEMC, phakathi kwazo ama-viscosities ezinhlobo ezi-2 ze-HPMC nezinhlobo ezi-2 ze-HEMC ngokusobala ezahlukene. I-viscosity ye-cellulose ether ihlolwe i-viscometer ejikelezayo ye-NDJ-1B (i-Shanghai Changji Company), ukugxila kwesixazululo sokuhlola kwakungu-1.0% noma u-2.0%, izinga lokushisa lalingu-20°C, futhi isivinini sokujikeleza sasingu-12r/min.

(2) Usimende. Usimende ojwayelekile wasePortland okhiqizwe nguWuhan Huaxin Cement Co., Ltd. unemininingwane ye-P·O 42.5 (GB 175-2007).

1.2 Indlela yokulinganisa i-viscosity yesisombululo se-cellulose ether

Thatha isampula ye-cellulose ether yekhwalithi eshiwo bese uyifaka ebhikayini yengilazi engu-250mL, bese wengeza u-250g wamanzi ashisayo cishe ku-90.°C; gubungula ngokugcwele ngenduku yengilazi ukuze wenze i-ether ye-cellulose ibe uhlelo lokuhlakazeka okufanayo emanzini ashisayo, futhi ngesikhathi esifanayo ubeke i-beaker Cool emoyeni. Lapho isixazululo siqala ukukhiqiza i-viscosity futhi ngeke siphinde siphinde, yeka ukugqugquzela ngokushesha; lapho isixazululo sipholile emoyeni kuze kube yilapho umbala ufana, faka i-beaker endaweni yokugeza yamanzi okushisa okungaguquki, futhi ugcine izinga lokushisa ekushiseni okucacisiwe. Iphutha lithi± 0.1°C; ngemuva kwe-2h (kubalwa kusukela esikhathini sokuxhumana se-cellulose ether ngamanzi ashisayo), linganisa izinga lokushisa lesikhungo sesisombululo nge-thermometer. Production) i-rotor efakwe kwisixazululo ekujuleni okucacisiwe, ngemuva kokuma i-5min, linganisa i-viscosity yayo.

1.3 Isilinganiso se-viscosity sikasimende oshintshiwe we-cellulose etheri-plaster esekelwe

Ngaphambi kokuhlolwa, gcina zonke izinto ezingavuthiwe ezingeni lokushisa elishiwo, ukale isisindo esishiwo se-cellulose ether nosimende, ukuxube kahle, bese wengeza amanzi ampompi ezingeni lokushisa elishiwo kubhika engilazi engu-250mL enesilinganiso sikasimende samanzi esingu-0.65; bese ufaka impushana eyomile kubhekha bese ulinda imizuzu emi-3 Govuza kahle ngenduku yengilazi izikhathi ezingu-300, faka i-rotor ye-viscometer ejikelezayo (uhlobo lwe-NDJ-1B, olukhiqizwa i-Shanghai Changji Geological Instrument Co., Ltd.) isisombululo sokujula okucacisiwe, futhi ulinganise i-viscosity yayo ngemuva kokuma imizuzu emi-2. Ukuze ugweme ithonya lokushisa kwe-cement hydration ekuhlolweni kwe-viscosity kasimendei-plaster esekelwe ngangokunokwenzeka, i-viscosity ye-cellulose ether eshintshiwe usimendei-plaster esekelwe kufanele ihlolwe lapho usimende uthintana namanzi imizuzu emi-5.

2. Imiphumela kanye nokuhlaziya

2.1 Umthelela wokuqukethwe kwe-cellulose ether

Inani le-cellulose ether lapha libhekisela esilinganisweni esikhulu se-cellulose ether kusimende, okungukuthi, isilinganiso se-polyash. Kusukela ethonyeni le-P2, E2 kanye ne-H1 izinhlobo ezintathu zama-cellulose ethers ekushintsheni kwe-viscosity kasimendei-plaster esekelwe ngemithamo ehlukene (0.1%, 0.3%, 0.6% kanye 0.9%), kungabonakala ukuthi ngemva kokwengeza cellulose ether, viscosity usimendei-plaster esekelwe I-viscosity iyanda; njengoba inani le-cellulose ether likhula, i-viscosity kasimendei-plaster esekelwe ukwanda ngokuqhubekayo, kanye nobubanzi bokwanda kwe-viscosity kasimendei-plaster esekelwe futhi iba nkulu.

Lapho isilinganiso samanzi-samente singu-0.65 kanye nokuqukethwe kwe-cellulose ether kungu-0.6%, uma kucatshangelwa amanzi adliwe yi-hydration yokuqala kasimende, ukuhlushwa kwe-cellulose ether okuhlobene namanzi cishe ku-1%. Uma ukugxila kungu-1%, i-P2, i-E2 ne-H1 izixazululo ezinamanzi Ama-viscosities angu-4990mPa·S, 5070mPa·S kanye ne-5250mPa·s ngokulandelana; lapho isilinganiso samanzi-samente singu-0.65, i-viscosity ye-samente ehlanzekilei-plaster esekelwe ngi 836 mPa·S. Nokho, ama-viscosities e-P2, E2 kanye ne-H1 ama-cellulose ether amathathu aguquliwe kasimende angu-13800mPa.·S, 12900mPa·S kanye ne-12700mPa·s ngokulandelana. Ngokusobala, i-viscosity ye-cellulose ether eguquliwe usimendei-plaster esekelwe akuyona i-viscosity yesisombululo se-cellulose ether kanye nokwengezwa okulula kwe-viscosity kasimende omsulwa.i-plaster esekelwe inkulu kakhulu kunesamba samaviscosities amabili, okungukuthi, i-viscosity yesisombululo se-cellulose ether kanye ne-viscosity kasimende.i-plaster esekelwe ibe "nomphumela we-superposition oyinhlanganisela". I-viscosity yesisombululo se-cellulose ether ivela ku-hydrophilicity eqinile yamaqembu e-hydroxyl kanye nezibopho ze-ether kuma-molecule e-cellulose ether kanye nesakhiwo senethiwekhi esinezinhlangothi ezintathu esakhiwe ama-molecule e-cellulose ether esixazululweni; i-viscosity kasimende ohlanzekilei-plaster esekelwe ivela kunethiwekhi eyakhiwe phakathi kwesakhiwo semikhiqizo ye-cement hydration. Njengoba imikhiqizo ye-polymer kanye ne-cement hydration ivame ukwakha isakhiwo senethiwekhi esingena ngaphakathi, kusimende oguquliwe we-cellulose ether.i-plaster esekelwe, uhlaka lwenethiwekhi olunezinhlangothi ezintathu lwe-cellulose ether kanye nesakhiwo senethiwekhi yemikhiqizo kasimende ye-hydration kuhlangene, futhi ama-molecule e-cellulose ether I-Adsorption nemikhiqizo ye-cement hydration ndawonye ikhiqiza "umphumela we-superposition oyinhlanganisela", okwandisa kakhulu i-viscosity yonke kasimende.i-plaster esekelwe; njengoba i-molecule ye-cellulose ether eyodwa ingahlangana nama-molecule e-cellulose ether amaningi kanye nemikhiqizo ye-cement hydration, Ngakho-ke, ngokwanda kokuqukethwe kwe-cellulose ether, ukuminyana kwesakhiwo senethiwekhi kukhula ngaphezu kokwanda kwama-molecule e-cellulose ether, kanye ne-viscosity kasimende.i-plaster esekelwe ukwanda ngokuqhubekayo; ngaphezu kwalokho, i-hydration esheshayo kasimende idinga ukusabela ingxenye yamanzi. , okulingana nokwandisa ukugxila kwe-cellulose ether, okubuye kube isizathu sokwanda okuphawulekayo kwe-viscosity kasimende.i-plaster esekelwe.

Kusukela cellulose ether kanye usimendei-plaster esekelwe abe "nomphumela we-superposition oyinhlanganisela" ku-viscosity, ngaphansi kokuqukethwe kwe-cellulose ether efanayo kanye nezimo zesilinganiso samanzi-samende, i-viscosity ye-cellulose ether eshintshiwe usimendei-plaster esekelwe ngomehluko osobala lapho ukugxila kungu-2% Umehluko we-viscosity awumkhulu, isibonelo, ama-viscosities we-P2 ne-E2 angama-48000mPa·s kanye ne-36700mPa·s ngokulandelana kwisixazululo esinamanzi esine-concentration engu-2%. S, umehluko awubonakali; ama-viscosities we-E1 kanye ne-E2 ku-2% yesisombululo samanzi ngu-12300mPa·S kanye ne-36700mPa·s ngokulandelana, umehluko mkhulu kakhulu, kepha ama-viscosities wokunamathisela kwawo usimende oguquliwe angama-9800mPa.·I-S kanye ne-12900mPa ngokulandelanayo·S, umehluko wehliswe kakhulu, ngakho-ke lapho ukhetha i-cellulose ether kwezobunjiniyela, akudingekile ukuphishekela i-viscosity ephezulu ye-cellulose ether. Ngaphezu kwalokho, ezinhlelweni zokusebenza zobunjiniyela, ukugcwala kwe-cellulose ether okuhlobene namanzi kuvamise ukuba phansi. Isibonelo, odakeni olujwayelekile lokuplasta, isilinganiso sikasimende samanzi sivame ukuba ngu-0.65, kanti okuqukethwe kwe-cellulose ether kungu-0.2% kuya ku-0.6%. Ukuhlangana kwamanzi kuphakathi kuka-0.3% no-1%.

Kungabonakala futhi emiphumeleni yokuhlola ukuthi izinhlobo ezahlukene ze-cellulose ethers zinemiphumela ehlukile ku-viscosity kasimende.i-plaster esekelwe. Uma ukugxila kungu-1%, ama-viscosities we-P2, E2 kanye ne-H1 izinhlobo ezintathu ze-cellulose ether solutions zingu-4990mPa.·s, 5070mPa·S kanye ne-5250mPa·S ngokulandelana, i-viscosity yesisombululo se-H1 iphezulu kakhulu, kodwa i-viscosity ye-P2, i-E2 ne-H1 izinhlobo ezintathu ze-cellulose ether·S, 12900mPa·S kanye ne-12700mPa·S ngokulandelana, kanye ne-viscosity ye-H1 modified Cement slurries yayiphansi kakhulu. Lokhu kungenxa yokuthi ama-cellulose ethers ngokuvamile anomphumela wokubambezela ukugeleza kukasimende. Phakathi kwezinhlobo ezintathu zama-cellulose ethers, i-HEC, i-HPMC ne-HEMC, i-HEC inamandla amakhulu okubambezela ukugeleza kukasimende. Ngakho-ke, kusimende oshintshiwe we-H1i-plaster esekelwe, ngenxa yokuhamba kancane kwe-cement hydration, isakhiwo senethiwekhi yemikhiqizo ye-cement hydration ikhula kancane, futhi i-viscosity iphansi kakhulu.

2.2 Umthelela wezinga lokuzungezisa

Kusukela kumthelela wejubane lokujikeleza kwe-viscometer ku-viscosity ye-cement ehlanzekilei-plaster esekelwe kanye nosimende oguquliwe we-cellulose etheri-plaster esekelwe, kungabonakala ukuthi njengoba isivinini sokujikeleza sikhula, i-viscosity ye-cellulose ether eshintshiwe usimende.i-plaster esekelwe nosimende omsulwai-plaster esekelwe ancipha abe ngamazinga ahlukahlukene , okungukuthi, wonke anendawo yokugunda i-shear futhi ayingxenye ye-pseudoplastic fluid. Uma kuncane izinga lokuzungeza, kukhulu ukwehla kwe-viscosity yawo wonke usimendei-plaster esekelwe ngesilinganiso sokujikeleza, okungukuthi, i-pseudoplasticity kasimende esobala kakhului-plaster esekelwe. Ngokukhula kwezinga lokujikeleza, ijika le-viscosity liyancipha likasimendei-plaster esekelwe kancane kancane iba isicaba, futhi i-pseudoplasticity iba buthaka. Uma kuqhathaniswa nosimende omsulwai-plaster esekelwe, i-pseudoplasticity ye-cellulose ether eshintshiwe usimendei-plaster esekelwe ibuthakathaka, okusho ukuthi, ukufakwa kwe-cellulose ether kunciphisa i-pseudoplasticity kasimende.i-plaster esekelwe.

Kusukela kumthelela wejubane lokujikeleza ku-viscosity kasimendei-plaster esekelwe ngaphansi kwezinhlobo ezahlukene ze-cellulose ether kanye nama-viscosities, kungaziwa ukuthi usimendei-plaster esekelwe ilungiswe ngama-cellulose ether ahlukene inamandla ahlukene e-pseudoplastic, futhi i-viscosity ye-cellulose ether incane, iba phezulu i-viscosity kasimende eshintshiwe.i-plaster esekelwe. Okusobala kakhulu i-pseudoplasticity kasimendei-plaster esekelwe ngu; i-pseudoplasticity kasimende oshintshiwei-plaster esekelwe ayinawo umehluko osobala ngezinhlobo ezahlukene zama-cellulose ether anama-viscosity afanayo. Kusukela ku-P2, E2 kanye ne-H1 izinhlobo ezintathu zikasimende oguquliwe we-cellulose etheri-plaster esekelwe ngemithamo ehlukene (0.1%, 0.3%, 0.6% kanye 0.9%), ithonya lejubane lokujikeleza ku-viscosity lingaziwa, i-P2, i-E2 ne-H1 izinhlobo ezintathu ze-fiber I-slurries kasimende elungiswe nge-ether engenalutho inemiphumela efanayo yokuhlola : uma inani le-cellulose ether lihlukile, i-pseudoplasticity yabo ihlukile. Uma lincane inani le-cellulose ether, i-pseudoplasticity kasimende eshintshiwe iba namandla.i-plaster esekelwe.

Ngemva kokuba usimende uhlangane namanzi, izinhlayiya zikasimende ezingaphezulu zikhishwa ngokushesha, futhi imikhiqizo ye-hydration (ikakhulukazi i-CSH gel) yakha isakhiwo se-agglomeration. Uma kukhona amandla okugunda okuqondisayo esixazululweni, isakhiwo se-agglomeration sizovuleka, ukuze eduze kokuqondisa kwe-shear force Ukumelana nokugeleza kokuqondisa kuyancishiswa, ngaleyo ndlela kubonise impahla yokunciphisa i-shear. I-Cellulose ether iwuhlobo lwe-macromolecule ene-asymmetric structure. Uma ikhambi lisamile, ama-molecule e-cellulose ether angaba nezimo ezihlukahlukene. Uma kukhona amandla okugunda okuqondisayo esixazululweni, uchungechunge olude lwe-molecule luzophenduka futhi luhambisane. Ukuqondiswa kwamandla okugunda kuyancishiswa, okuholela ekwehleni kokumelana nokugeleza, futhi kubuye kubonise impahla yokugunda kwe-shear. Uma kuqhathaniswa nemikhiqizo kasimende ye-hydration, ama-molecule e-cellulose ether avumelana nezimo futhi anamandla athile okuvimbela amandla okugunda. Ngakho-ke, uma kuqhathaniswa nosimende omsulwai-plaster esekelwe, i-pseudoplasticity ye-cellulose ether eshintshiwe usimendei-plaster esekelwe ibuthakathaka, futhi, njengoba i-viscosity noma okuqukethwe kwe-cellulose ether kwanda, umthelela we-buffering wama-molecule e-cellulose ether ku-shear force ubonakala kakhudlwana. Ipulasitiki iba buthaka.

2.3 Ithonya lokushisa

Kusukela kumphumela wokushintsha kwezinga lokushisa (20°C, 27°c kanye 35°C) ku-viscosity ye-cellulose ether eshintshiwe usimendei-plaster esekelwe, kungabonakala ukuthi lapho okuqukethwe kwe-cellulose ether kungu-0.6%, njengoba izinga lokushisa likhuphuka, usimende ohlanzekile.i-plaster esekelwe kanye ne-M1 I-viscosity yesimende eshintshiwei-plaster esekelwe ukwanda, kanye ne-viscosity yomunye usimende we-cellulose ether oshintshiwei-plaster esekelwe kwehle, kodwa ukwehla kwakungekukhulu, kanye ne-viscosity ye-H1 yesimende eguquliwei-plaster esekelwe kwehle kakhulu. Kuze kufike ku-E2 oshintshiwe usimendei-plaster esekelwe ukhathazekile, lapho isilinganiso se-polyash singama-0.6%, i-viscosity ye-cementi-plaster esekelwe iyancipha ngokunyuka kwezinga lokushisa, futhi lapho isilinganiso se-polyash singama-0.3%, i-viscosity kasimendei-plaster esekelwe inyuka ngokunyuka kwezinga lokushisa.

Ngokuvamile, ngenxa yokuncipha kwamandla okusebenzisana kwama-intermolecular, i-viscosity yoketshezi izokwehla ngokunyuka kwezinga lokushisa, okuyisimo sesixazululo se-cellulose ether. Kodwa-ke, njengoba izinga lokushisa likhuphuka, futhi isikhathi sokuxhumana phakathi kukasimende namanzi sikhuphuka, isivinini se-cement hydration sizosheshisa kakhulu, futhi izinga le-hydration lizokhula, ngakho-ke i-viscosity kasimende ehlanzekile.i-plaster esekelwe izokwanda esikhundleni.

Kusimende oguquliwe we-cellulose etheri-plaster esekelwe, i-cellulose ether izokhangiswa ebusweni bemikhiqizo ye-cement hydration, ngaleyo ndlela ivimbele ukugeleza kukasimende, kodwa izinhlobo ezahlukene kanye namanani e-cellulose ethers anamakhono ahlukene okuvimbela ukugeleza kwe-cement, i-MC (njenge-M1) inekhono elibuthakathaka lokuvimbela ukugeleza kukasimende, futhi njengoba izinga lokushisa likhuphuka, izinga lokumanzisa kukasimendei-plaster esekelwe isashesha, ngakho-ke njengoba izinga lokushisa likhuphuka, i-viscosity Ivame ukwanda; I-HEC, i-HPMC kanye ne-HEMC ingavimbela ngokuphawulekayo ukugeleza kukasimende, njengoba izinga lokushisa likhuphuka, izinga lokugeleza likasimende.i-plaster esekelwe ihamba kancane, ngakho-ke njengoba izinga lokushisa likhuphuka, i-HEC, i-HPMC ne-HEMC eguquliwe usimende I-viscosityi-plaster esekelwe (0.6% i-polyash ratio) ngokuvamile iyancishiswa, futhi ngenxa yokuthi ikhono le-HEC lokubambezela ukufakwa kukasimende kukhulu kune-HPMC ne-HEMC, ukuguqulwa kwe-cellulose ether ekushintsheni kwezinga lokushisa (20°C, 27°c kanye 35°C) I-viscosity ye-H1 yesimende eshintshiwei-plaster esekelwe lehle kakhulu ngokwenyuka kwezinga lokushisa. Nokho, ukugeleza kukasimende kusekhona lapho izinga lokushisa liphakeme, ngakho izinga lokuncipha kukasimende oguquliwe we-cellulose etheri-plaster esekelwe ngokwanda kwezinga lokushisa akubonakali. Kuze kufike ku-E2 oshintshiwe usimendei-plaster esekelwe ukhathazekile, lapho umthamo uphakeme (isilinganiso somlotha singu-0.6%), umphumela wokuvimbela i-samente hydration uyabonakala, futhi i-viscosity iyancipha ngokunyuka kwezinga lokushisa; lapho umthamo uphansi (isilinganiso somlotha singu-0.3%), umphumela wokuvimbela i-samente hydration awubonakali, futhi i-viscosity iyanda ngokunyuka kwezinga lokushisa.

3. Isiphetho

(1) Ngokukhula okuqhubekayo kokuqukethwe kwe-cellulose ether, i-viscosity kanye ne-viscosity yokwandisa izinga likasimende.i-plaster esekelwe qhubeka nokwanda. Isakhiwo senethiwekhi yamangqamuzana e-cellulose ether kanye nesakhiwo senethiwekhi yemikhiqizo ye-cement hydration kuhlangene, futhi ukugeleza kokuqala kukasimende ngokungaqondile kwandisa ukugxila kwe-cellulose ether, ukuze i-viscosity yesisombululo se-cellulose ether kanye nosimende.i-plaster esekelwe ine "composite superposition effect", okungukuthi, i-cellulose ether I-viscosity ye-samente eguquliwei-plaster esekelwe likhulu kakhulu kunesamba se-viscosity yazo. Uma kuqhathaniswa ne-HPMC kanye ne-HEMC eguquliwe usimende slurries, ama-slurries kasimende ashintshiwe we-HEC anamanani aphansi okuhlola i-viscosity ngenxa yokuthuthukiswa kancane kokugeleza kwamanzi.

(2) Kokubili usimende oguquliwe we-cellulose etheri-plaster esekelwe nosimende omsulwai-plaster esekelwe babe nempahla yokugunda i-shear noma i-pseudoplasticity; i-pseudoplasticity ye-cellulose ether eshintshiwe usimendei-plaster esekelwe ingaphansi kukasimende omsulwai-plaster esekelwe; yehlisa izinga lokuzungeza, noma i-cellulose Iyancipha i-viscosity kasimende oshintshiwe nge-etheri-plaster esekelwe, noma ukuncipha kokuqukethwe kwe-cellulose ether, kusobala kakhulu i-pseudoplasticity ye-cellulose ether-modified Cementi-plaster esekelwe.

(3) Njengoba izinga lokushisa liqhubeka likhuphuka, isivinini kanye nezinga likasimende liyakhula, ukuze i-viscosity kasimende ehlanzekile.i-plaster esekelwe kancane kancane iyanda. Ngenxa yezinhlobo ezahlukene kanye namanani e-cellulose ethers anamakhono ahlukene okuvimbela ukugeleza kukasimende, i-viscosity yokunamathisela usimende eguquliwe iyahlukahluka kuye ngezinga lokushisa.