I-Cellulose Etere Ukutshintsha kweViscosity kwi-samente esekelwe kwi-plaster

Ukutyeba yimpembelelo ebalulekileyo yokuguqulwa kwe-cellulose ether kwizinto ezisekelwe kwisamente. Iziphumo zomxholo we-cellulose ether, isantya sokujikeleza kwe-viscometer kunye nobushushu kwinguqu ye-viscosity ye-cellulose ether eguqulelwe kwisamente.udaka olusekelwe zafundwa. Iziphumo zibonisa ukuba i-viscosity yesamenteudaka olusekelwe inyuka ngokuqhubekayo ngokunyuka kwe-cellulose ether content, kunye ne-viscosity yesisombululo se-cellulose ether kunye nesamente.udaka olusekelwe ine "composite superposition effect"; ipseudoplasticity ye-cellulose ether yesamente elungisiweyoudaka olusekelwe ingaphantsi kunaleyo yesamente ecocekileyoudaka olusekelwe, kunye ne-viscosity Isezantsi isantya sokujikeleza kwesixhobo, okanye isezantsi i-viscosity ye-cellulose ether eguqulelwe kwisamenteudaka olusekelwe, okanye usezantsi umxholo we-cellulose ether, kokukhona icace ngakumbi ipseudoplasticity ye-cellulose ether eguqulelwe kwisamente.udaka olusekelwe; Ngempembelelo edibeneyo ye-hydration, i-viscosity ye-cellulose ether eguqulelwe isamenteudaka olusekelwe ziya kwanda okanye zehle. Iindidi ezahlukeneyo ze-cellulose ether zineenguqu ezahlukeneyo kwi-viscosity ye-samente elungisiweyoudaka olusekelwe.

Amagama angundoqo: i-cellulose ether; isamenteudaka olusekelwe; i-viscosity

0,Intshayelelo

I-cellulose ethers isetyenziswa rhoqo njengeejenti zokugcina amanzi kunye nee-thickeners zemathiriyeli esekwe kwisamente. Ngokwabaxumi abahlukeneyo, i-cellulose ethers esetyenziswa kwizinto ezisekelwe kwisamente ngokubanzi ziquka i-methyl cellulose (MC), i-hydroxyethyl cellulose (HEC), i-hydroxyethyl methyl cellulose Ether (i-Hydroxyethyl methyl cellulose, i-HEMC) kunye ne-hydroxypropyl methyl cellulose (Hydroxypropyl methylMC cellulose), phakathi kwazo i-HPMC kunye ne-HEMC zezona zisetyenziswa kakhulu.

Ukutyeba yimpembelelo ebalulekileyo yokuguqulwa kwe-cellulose ether kwizinto ezisekelwe kwisamente. I-ether ye-cellulose inokunika udaka olumanzi kunye ne-viscosity egqwesileyo, yandisa kakhulu amandla okudibanisa phakathi kodaka olumanzi kunye nomgangatho wesiseko, kunye nokuphucula ukusebenza kwe-anti-sag yodaka. Isenokonyusa i-homogeneity kunye nesakhono sokuchasa ukusasazeka kwezixhobo ezisandul' ukuxutywa esekwe kwisamente, kwaye ithintele i-delamination, ulwahlulo kunye nokopha kodaka kunye nekhonkrithi.

Umphumo wokuqina we-cellulose ether kwizinto ezisekelwe kwi-samente zinokuvavanywa ngokobungakanani bemodeli ye-rheological yezinto ezisekelwe kwi-samente. Izinto ezisekelwe kwi-cement zivame ukuthathwa njenge-Bingham fluid, oko kukuthi, xa i-shear stress isetyenzisiwe r ingaphantsi koxinzelelo lwesivuno r0, izinto eziphathekayo zihlala zikwimo yayo yangaphambili kwaye azihambi; xa uxinzelelo lwe-chear ludlula uxinzelelo lwesivuno R0, into idlula kwi-deformation, kunye noxinzelelo lwe-chear Uxinzelelo r lunobudlelwane bomgca kunye nesantya soxinzelelo y, oko kukuthi, r=r0+f·y, apho u-f yi-viscosity yeplastiki. I-cellulose ethers ngokubanzi yonyusa uxinzelelo lwesivuno kunye ne-viscosity yeplastiki yezinto ezisekelwe kwi-samente, nangona kunjalo, iidosi ezisezantsi zikhokelela ekuxinzezeleni kwesivuno esisezantsi kunye ne-viscosity yeplastiki, ngokukodwa ngenxa yempembelelo ye-air-entraining ye-cellulose ethers. Uphando lukaPatural lubonisa ukuba ubunzima bemolekyuli ye-cellulose ether buyanda, uxinzelelo lwesivuno sesamente.udaka olusekelwe kuncipha, kwaye ukuhambelana kuyanda.

I-viscosity yesamenteudaka olusekelwe sisalathiso esibalulekileyo sokuvavanya ukutyeba kwe-ether ye-cellulose kwizinto ezisekelwe kwisamente. Ezinye iincwadi zihlolisise umthetho wokutshintsha kwe-viscosity yesisombululo se-cellulose ether, kodwa kusekho ukungabikho kophando olufanelekileyo malunga nomphumo we-cellulose ether kwi-viscosity utshintsho lwesamente.udaka olusekelwe. Ngexesha elifanayo, ngokweentlobo ezahlukeneyo ze-substituents, kukho iintlobo ezininzi ze-cellulose ethers. Impembelelo yeentlobo ezahlukeneyo kunye ne-viscosities ye-cellulose ethers ekutshintsheni kwe-samenteudaka olusekelwe I-viscosity ikwangumba ochaphazelekayo kakhulu ekusebenziseni i-cellulose ethers. Lo msebenzi usebenzisa i-viscometer ejikelezayo ukufunda utshintsho lwe-viscosity ye-cellulose ether eguqulelwe i-sement slurries yeentlobo ezahlukeneyo kunye ne-viscosities phantsi kwe-poly-ash ratios ezahlukeneyo, isantya sokujikeleza kunye namaqondo okushisa.

1. Linge

1.1 Iimathiriyeli ekrwada

(1) Iselulosi ether. Iindidi ezintandathu ze-cellulose ethers eziqhele ukusetyenziswa kwilizwe lam zikhethiwe, kubandakanywa uhlobo olu-1 lwe-MC, uhlobo olu-1 lwe-HEC, iintlobo ezi-2 ze-HPMC kunye neentlobo ezi-2 ze-HEMC, phakathi kwazo ii-viscosities zeentlobo ezi-2 ze-HPMC kunye neentlobo ezi-2 ze-HEMC ngokucacileyo. ezahlukeneyo. I-viscosity ye-cellulose ether yavavanywa yi-NDJ-1B i-viscometer ejikelezayo (i-Shanghai Changji Inkampani), ukuxinwa kwesisombululo sovavanyo kwakuyi-1.0% okanye i-2.0%, iqondo lokushisa laliyi-20.°C, kunye nesantya sokujikeleza sasiyi-12r / min.

(2) Isamente. Isamente yePortland eqhelekileyo eveliswe nguWuhan Huaxin Cement Co., Ltd. inenkcukacha zeP·O 42.5 (GB 175-2007).

1.2 Indlela yokulinganisa i-Viscosity yesisombululo se-cellulose ether

Thatha isampuli ye-cellulose ether yomgangatho ochaziweyo kwaye uyifake kwibeaker yeglasi engama-250mL, uze wongeze i-250g yamanzi ashushu malunga ne-90.°C; ukuvuselela ngokupheleleyo ngentonga yeglasi ukwenza i-etere yeselulosi yenze inkqubo yokusabalalisa iyunifomu emanzini ashushu, kwaye kwangaxeshanye ubeke i-beaker Cool emoyeni. Xa isisombululo siqala ukuvelisa i-viscosity kwaye asiyi kuphinda sinqande, yeka ukuvuselela ngokukhawuleza; xa isisombululo sipholile emoyeni de umbala ufanane, ubeke i-beaker kwindawo yokuhlambela amanzi ashushu rhoqo, kwaye ugcine ubushushu kwiqondo lokushisa elichaziweyo. Impazamo yile± 0.1°C; emva kwe-2h (kubalwa ukusuka kwixesha lokuqhagamshelana ne-cellulose ether ngamanzi ashushu), ukulinganisa ubushushu beziko lesisombululo nge-thermometer. Ukuveliswa) i-rotor efakwe kwisisombululo kubunzulu obuchaziweyo, emva kokuma i-5min, ukulinganisa i-viscosity yayo.

1.3 Umlinganiselo we-viscosity ye-cellulose ether eguqulwayo yesamenteudaka olusekelwe

Ngaphambi kovavanyo, gcina zonke izinto eziluhlaza kwiqondo lokushisa elichaziweyo, ulinganise ubunzima obuchaziweyo be-cellulose ether kunye nesamente, udibanise ngokucokisekileyo, kwaye ungeze amanzi okupompoza kwiqondo lokushisa elichaziweyo kwi-beaker yeglasi ye-250mL kunye nomlinganiselo wamanzi-samente we-0.65; emva koko wongeza umgubo owomileyo kwi-beaker kwaye ulinde imizuzu emi-3 Gxuma kakuhle ngentonga yeglasi ngamaxesha angama-300, faka i-rotor ye-viscometer ejikelezayo (uhlobo lwe-NDJ-1B, oluveliswe yi-Shanghai Changji Geological Instrument Co., Ltd.) isisombululo kubunzulu obuchaziweyo, kwaye ulinganise i-viscosity yayo emva kokuma imizuzu emi-2. Ukuze ugweme impembelelo yokushisa kwe-samente kwi-viscosity test ye-samenteudaka olusekelwe kangangoko kunokwenzeka, i-viscosity ye-cellulose ether eguqulwayo yesamenteudaka olusekelwe kufuneka ivavanywe xa isamente idibene namanzi imizuzu emi-5.

2. Iziphumo kunye nohlalutyo

2.1 Impembelelo yesiqulatho se-cellulose ether

Isixa se-cellulose ether apha sibhekisa kumlinganiselo we-cellulose ether kwisamente, oko kukuthi, umlinganiselo we-polyash. Ukusuka kwimpembelelo ye-P2, E2 kunye ne-H1 iintlobo ezintathu ze-cellulose ethers kutshintsho lwe-viscosity yesamente.udaka olusekelwe kwiidosi ezahlukeneyo (0.1%, 0.3%, 0.6% kunye ne-0.9%), kunokubonwa ukuba emva kokongeza i-cellulose ether, i-viscosity ye-samente.udaka olusekelwe I-Viscosity iyanda; njengoko isixa se-cellulose ether sanda, i-viscosity ye-samenteudaka olusekelwe ukwanda ngokuqhubekayo, kunye noluhlu lokunyuka kwe-viscosity ye-cementudaka olusekelwe nayo iba nkulu.

Xa umlinganiselo wamanzi-samente ngu-0.65 kunye nomxholo we-cellulose ether ngu-0.6%, ngokuqwalasela amanzi asetyenziswe yi-hydration yokuqala ye-samente, ukuxinwa kwe-cellulose ether ngokumalunga namanzi malunga ne-1%. Xa i-concentration yi-1%, i-P2, i-E2 kunye ne-H1 izisombululo zamanzi I-viscosities yi-4990mPa·S, 5070mPa·S kunye ne-5250mPa·s ngokulandelelanayo; xa umlinganiselo wamanzi-samente ngu-0.65, i-viscosity ye-samente ecocekileyoudaka olusekelwe yi 836 mPa·S. Nangona kunjalo, ii-viscosities ze-P2, i-E2 kunye ne-H1 ezintathu ze-cellulose ether eziguqulelwe kwi-slurries zesamente ziyi-13800mPa.·S, 12900mPa·S kunye ne-12700mPa·s ngokulandelelanayo. Ngokucacileyo, i-viscosity ye-cellulose ether iguqulwe isamenteudaka olusekelwe ayisiyiyo i-viscosity ye-cellulose ether isisombululo kunye nokongeza okulula kwe-viscosity yesamente ecocekileyo.udaka olusekelwe inkulu kakhulu kunesixa se-viscosities ezimbini, oko kukuthi, i-viscosity yesisombululo se-cellulose ether kunye ne-viscosity yesamente.udaka olusekelwe ibe "nempembelelo edibeneyo edibeneyo". I-viscosity yesisombululo se-cellulose ether ivela kwi-hydrophilicity eqinile yamaqela e-hydroxyl kunye neebhondi ze-ether kwi-cellulose i-ether molecules kunye nesakhiwo senethiwekhi ye-three-dimensional eyenziwa yi-cellulose ether molecules kwisisombululo; i-viscosity yesamente ecocekileyoudaka olusekelwe ivela kwinethiwekhi eyenziwe phakathi kwesakhiwo seemveliso zesamente hydration. Ekubeni i-polymer kunye neemveliso ze-samente hydration zihlala zenza isakhiwo sothungelwano esingena ngaphakathi, kwi-cellulose ether eguqulelwe kwisamente.udaka olusekelwe, Ulwakhiwo lwenethiwekhi ye-ether ye-cellulose kunye nesakhiwo sothungelwano lweemveliso ze-samente hydration zidibene, kunye ne-cellulose ether molekyuli I-Adsorption kunye neemveliso ze-cement hydration kunye zivelisa "impembelelo ye-composite superposition", eyandisa kakhulu i-viscosity yesamente.udaka olusekelwe; ekubeni enye imolekyuli ye-ether cellulose inokudibanisa iimolekyuli ezininzi ze-cellulose ether kunye neemveliso zesamente ze-hydration, ngoko ke, ngokunyuka komxholo we-cellulose ether, ubuninzi besakhiwo sothungelwano kwandisa ngaphezu kokunyuka kweemolekyuli ze-cellulose ether, kunye ne-viscosity yesamente.udaka olusekelwe ukwanda ngokuqhubekayo; ukongeza, i-hydration ekhawulezayo ye-samente idinga ukusabela inxalenye yamanzi. , elilingana nokwandisa i-cellulose ether, ekwasisizathu sokwanda okukhulu kwe-viscosity ye-samente.udaka olusekelwe.

Ukususela ether cellulose kunye nesamenteudaka olusekelwe ube "nempembelelo ye-composite superposition" kwi-viscosity, phantsi komxholo ofanayo we-cellulose ether kunye neemeko zomlinganiselo wamanzi-samente, i-viscosity ye-cellulose ether eguqulelwe isamente.udaka olusekelwe Ngomahluko ocacileyo xa ugxininiso luyi-2% Umahluko we-viscosity awukho mkhulu, umzekelo, i-viscosities ye-P2 kunye ne-E2 yi-48000mPa.·s kunye ne36700mPa·s ngokulandelanayo kwisisombululo samanzi kunye noxinzelelo lwe-2%. S, umahluko awubonakali; i-viscosities ye-E1 kunye ne-E2 kwi-2% isisombululo se-aqueous yi-12300mPa·S kunye ne-36700mPa·ngokulandelelana, umahluko mkhulu kakhulu, kodwa ii-viscosities zepaste yazo yesamente elungisiweyo yi-9800mPa.·S kunye ne-12900mPa ngokulandelelanayo·S, umahluko uncitshiswe kakhulu, ngoko ke xa ukhetha i-cellulose ether kubunjineli, akuyomfuneko ukulandela i-viscosity ye-cellulose ephezulu kakhulu. Ngaphezu koko, kwizicelo zobunjineli ezisebenzayo, ukuxinana kwe-cellulose ether xa kuthelekiswa namanzi kuhlala kuphantsi. Ngokomzekelo, kumdaka oqhelekileyo wokutyabeka, umlinganiselo wamanzi-samente udla malunga ne-0.65, kwaye umxholo we-cellulose ether ngu-0.2% ukuya kwi-0.6%. Uxinzelelo lwamanzi luphakathi kwe-0.3% kunye ne-1%.

Inokubonwa kwakhona kwiziphumo zovavanyo ukuba iintlobo ezahlukeneyo ze-cellulose ethers zineempembelelo ezahlukeneyo kwi-viscosity yesamente.udaka olusekelwe. Xa ugxininiso luyi-1%, i-viscosities ye-P2, i-E2 kunye ne-H1 iintlobo ezintathu ze-cellulose ether isisombululo se-aqueous yi-4990mPa.·s, 5070mPa·S kunye ne-5250mPa·S ngokulandelanayo, i-viscosity yesisombululo se-H1 iyona ephezulu, kodwa i-viscosity ye-P2, i-E2 kunye ne-H1 iintlobo ezintathu ze-cellulose ether I-viscosities ye-ether-modified slurries ye-cement yayiyi-13800mPa.·S, 12900mPa·S kunye ne-12700mPa·S ngokulandelanayo, kunye ne-viscosity ye-slurries ye-sement elungisiweyo ye-H1 yayiyeyona iphantsi. Oku kungenxa yokuba i-cellulose ethers idla ngokuba nefuthe lokulibazisa ukuhanjiswa kwesamente. Phakathi kweentlobo ezintathu ze-cellulose ethers, i-HEC, i-HPMC kunye ne-HEMC, i-HEC inamandla amakhulu okulibazisa i-cement hydration. Ngoko ke, kwi-samente elungisiweyo ye-H1udaka olusekelwe, ngenxa yokucotha kwe-cement hydration, i-network structure yeemveliso ze-cement hydration ikhula ngokukhawuleza, kwaye i-viscosity iyona ephantsi.

2.2 Impembelelo yesantya sokujikeleza

Ukususela kwimpembelelo yesantya sokujikeleza kwe-viscometer kwi-viscosity ye-samente ecocekileyoudaka olusekelwe kunye nesamente ye-cellulose ether elungisiweyoudaka olusekelwe, kunokubonwa ukuba njengoko isantya sokujikeleza sikhula, i-viscosity ye-cellulose ether eguqulelwe isamenteudaka olusekelwe kunye nesamente ecocekileyoudaka olusekelwe iyancipha ukuya kumaqondo ahlukeneyo , oko kukuthi, bonke banepropathi yokucheba kwaye bayi-pseudoplastic fluid. Umncinci umlinganiselo wokujikeleza, ukuncipha okukhulu kwe-viscosity yayo yonke i-samenteudaka olusekelwe kunye nesantya sokujikeleza, oko kukuthi, ngokucacileyo ngakumbi i-pseudoplasticity yesamenteudaka olusekelwe. Ngokunyuka kwezinga lokujikeleza, i-curve ye-viscosity yehla ye-cementudaka olusekelwe kancinci kancinci, kwaye i-pseudoplasticity iba buthathaka. Xa kuthelekiswa nesamente ecocekileyoudaka olusekelwe, i-pseudoplasticity ye-cellulose ether eguqulwayo yesamenteudaka olusekelwe ibuthathaka, oko kukuthi, ukufakwa kwe-cellulose ether kunciphisa i-pseudoplasticity yesamente.udaka olusekelwe.

Ukususela kwimpembelelo yesantya sokujikeleza kwi-viscosity ye-samenteudaka olusekelwe phantsi kweentlobo ezahlukeneyo ze-ether cellulose kunye ne-viscosities, kuyaziwa ukuba i-samenteudaka olusekelwe ilungiswe ngee-ethers ze-cellulose ezahlukeneyo zinamandla ahlukeneyo e-pseudoplastic, kwaye incinci i-viscosity ye-cellulose ether, iphezulu i-viscosity yesamente eguquliweyo.udaka olusekelwe. Okukhona kucaca ngakumbi ipseudoplasticity yesamenteudaka olusekelwe yi; ipseudoplasticity yesamente elungisiweyoudaka olusekelwe ayinamahluko ucacileyo kunye neentlobo ezahlukeneyo ze-cellulose ethers ezine-viscosities ezifanayo. Ukusuka kwi-P2, i-E2 kunye ne-H1 iintlobo ezintathu ze-cellulose ether eguqulwayo yesamenteudaka olusekelwe kwidosi eyahlukileyo (0.1%, 0.3%, 0.6% kunye ne-0.9%), impembelelo yesantya sokujikeleza kwi-viscosity inokwaziwa, i-P2, i-E2 kunye ne-H1 iintlobo ezintathu zefiber I-slurries ye-samente eguqulwe nge-ether ecacileyo ineziphumo zovavanyo ezifanayo. : xa inani le-cellulose ether lihlukile, i-pseudoplasticity yabo iyahluka. Okukhona umncinci umlinganiselo we-cellulose ether, kokukhona uqina ipseudoplasticity yesamente elungisiweyo.udaka olusekelwe.

Emva kokuba i-samente idibene namanzi, iinqununu ze-samente phezu komhlaba zixutywe ngokukhawuleza, kwaye iimveliso ze-hydration (ingakumbi i-CSH gel) zenza isakhiwo se-agglomeration. Xa kukho i-directional shear force kwisisombululo, isakhiwo se-agglomeration siya kuvula, ukwenzela ukuba kunye nolwalathiso lwe-shear force Ukumelana nokuhamba kwe-directional kuyancipha, ngaloo ndlela kubonisa ipropati ye-shear thinning. I-cellulose ether luhlobo lwe-macromolecule ene-asymmetric structure. Xa isisombululo sisekhona, iimolekyuli ze-cellulose ether zinokuba neendlela ezahlukeneyo zokuqhelaniswa. Xa kukho i-directional shear force kwisisombululo, i-chain chain ye-molecule iya kujika kwaye ihambe. Isalathiso samandla okucheba sincitshisiwe, okukhokelela ekunciphiseni ukuchasana nokuhamba, kwaye kwakhona kubonisa ipropathi ye-shear thinning. Xa kuthelekiswa neemveliso zesamente zokugalela amanzi, iimolekyuli ze-cellulose ether zibhetyebhetye ngakumbi kwaye zinomthamo othile wokuthintela amandla okucheba. Ngoko ke, xa kuthelekiswa nesamente ecocekileyoudaka olusekelwe, i-pseudoplasticity ye-cellulose ether eguqulwayo yesamenteudaka olusekelwe ibuthathaka, kwaye, njengoko i-viscosity okanye umxholo we-cellulose ether isanda, isiphumo sobuffering se-cellulose ether molekyuli kumandla wokucheba ibonakala ngakumbi. Iplastiki iba buthathaka.

2.3 Impembelelo yobushushu

Ukusuka kwimpembelelo yokutshintsha kobushushu (20°C, 27°C kunye ne35°C) kwi-viscosity ye-cellulose ether eguqulelwe isamenteudaka olusekelwe, kunokubonwa ukuba xa umxholo we-cellulose ether ngu-0.6%, njengoko ukushisa kukhula, i-samente ecocekileyo.udaka olusekelwe kunye ne-M1 I-viscosity yesamente elungisiweyoudaka olusekelwe ukwanda, kunye ne-viscosity yenye i-ether ye-cellulose eguqulwayo yesamenteudaka olusekelwe yehla, kodwa ukuhla kwakungekukhulu, kunye ne-viscosity ye-sement eguqulweyo ye-H1udaka olusekelwe yehle kakhulu. Ukuya kuthi ga kwi-E2 elungisiweyo yesamenteudaka olusekelwe ixhalabile, xa umlinganiselo we-polyash ngu-0.6%, i-viscosity ye-samenteudaka olusekelwe iyancipha ngokunyuka kweqondo lokushisa, kwaye xa umlinganiselo we-polyash ngu-0.3%, i-viscosity ye-samenteudaka olusekelwe ukwanda kunye nokunyuka kobushushu.

Ngokuqhelekileyo, ngenxa yokuncipha kwamandla e-intermolecular interaction, i-viscosity yolwelo iya kuncipha ngokunyuka kweqondo lokushisa, okuyimeko yesisombululo se-cellulose ether. Nangona kunjalo, njengoko iqondo lokushisa liphakama, kwaye ixesha lokuqhagamshelana phakathi kwesamente kunye namanzi linyuka, isantya se-cement hydration siya kukhawuleziswa kakhulu, kwaye iqondo lokuhamba kwamanzi liya kwanda, ngoko i-viscosity ye-cement ecocekileyo.udaka olusekelwe iya kwanda endaweni yoko.

Kwi-cellulose ether isamente eguqulweyoudaka olusekelwe, i-ether ye-cellulose iya kubhengezwa kumphezulu weemveliso ze-cement hydration, ngaloo ndlela inqanda i-cement hydration, kodwa iintlobo ezahlukeneyo kunye neemali ze-cellulose ethers zinezakhono ezahlukeneyo zokuthintela i-cement hydration, i-MC (efana ne-M1) inamandla obuthathaka okuthintela i-cement hydration, kwaye njengoko iqondo lobushushu linyuka, izinga lokuthotywa kwesamenteudaka olusekelwe isahamba ngokukhawuleza, ngoko ke njengoko izinga lokushisa linyuka, i-viscosity Ngokuqhelekileyo yanda; I-HEC, i-HPMC kunye ne-HEMC inokuthintela kakhulu i-cement hydration, njengoko iqondo lokushisa linyuka, izinga lokunyuswa kwesamente.udaka olusekelwe iyacotha, ngoko njengoko ubushushu bunyuka, i-HEC, i-HPMC kunye ne-HEMC eguqulelwe kwisamente I-viscosity yeudaka olusekelwe (i-0.6% ye-polyash ratio) iyancipha ngokubanzi, kwaye ngenxa yokuba amandla e-HEC ukulibazisa i-cement hydration inkulu kune-HPMC kunye ne-HEMC, utshintsho lwe-cellulose ether ekutshintsheni ukushisa (20)°C, 27°C kunye ne35°C) I-viscosity ye-samente elungisiweyo ye-H1udaka olusekelwe yehle kakhulu ngokunyuka kwamaqondo obushushu. Nangona kunjalo, i-cement hydration isekhona xa iqondo lobushushu liphezulu, ngoko iqondo lokunciphisa i-cellulose ether yesamente eguqulwayo.udaka olusekelwe ngokunyuka kwamaqondo obushushu akucacanga. Ukuya kuthi ga kwi-E2 elungisiweyo yesamenteudaka olusekelwe inkxalabo, xa i-dosage iphezulu (umlinganiselo womlotha ngu-0.6%), umphumo wokuvimbela i-cement hydration ibonakala, kwaye i-viscosity iyancipha ngokunyuka kweqondo lokushisa; xa i-dosage iphantsi (umlinganiselo womlotha ngu-0.3%), umphumo wokuvimbela i-cement hydration ayibonakali, kwaye i-viscosity iyanda ngokunyuka kweqondo lokushisa.

3. Isiphelo

(1) Ngokunyuka okuqhubekayo komxholo we-cellulose ether, i-viscosity kunye ne-viscosity yokunyusa izinga le-samente.udaka olusekelwe ukuqhubeka ukwanda. Ubume bothungelwano lwemolekyuli ye-ether yeselulosi kunye nesakhiwo sothungelwano lweemveliso zesamente ze-hydration zithungelana, kunye ne-hydration yokuqala yesamente ngokungangqalanga kwandisa uxinaniso lwe-ether cellulose, ukuze i-viscosity yesisombululo se-ether seselulosi kunye nesamente.udaka olusekelwe ine "composite superposition effect", oko kukuthi, i-cellulose ether I-viscosity yesamente elungisiweyo.udaka olusekelwe inkulu kakhulu kunesixa seeviscosities zabo. Xa kuthelekiswa ne-HPMC kunye ne-HEMC eguqulwe i-sement slurries, i-HEC eguqulelwe i-sement slurries inexabiso eliphantsi lovavanyo lwe-viscosity ngenxa yophuhliso olucothayo lwe-hydration.

(2) Zombini i-cellulose ether i-sement modified cementudaka olusekelwe kunye nesamente ecocekileyoudaka olusekelwe babe nepropathi yokucheba okanye i-pseudoplasticity; ipseudoplasticity ye-cellulose ether yesamente elungisiweyoudaka olusekelwe ingaphantsi kunaleyo yesamente ecocekileyoudaka olusekelwe; isezantsi isantya sokujikeleza, okanye i-cellulose Isezantsi i-viscosity yesamente eguquliweyoudaka olusekelwe, okanye usezantsi umxholo we-cellulose ether, kokukhona kubonakala ngakumbi i-pseudoplasticity ye-cellulose ether-modified sementudaka olusekelwe.

(3) Njengoko iqondo lobushushu liqhubeka linyuka, isantya kunye nenqanaba le-samente yokugalela amanzi liyanda, ukuze i-viscosity yesamente ecocekileyo.udaka olusekelwe ngokuthe ngcembe iyanda. Ngenxa yeentlobo ezahlukeneyo kunye nezixa ze-cellulose ethers zinezakhono ezahlukeneyo zokuthintela i-cement hydration, i-viscosity ye-samente eguquguqukayo yokunamathisela iyahluka kunye nobushushu.