Umphumela ongcono we-hydroxypropyl methylcellulose (HPMC) ezintweni ezisekelwe kusimende

Eminyakeni yamuva nje, ngokuthuthukiswa okuqhubekayo kobuchwepheshe bokufaka odongeni lwangaphandle, ukuqhubeka okuqhubekayo kobuchwepheshe bokukhiqiza i-cellulose, kanye nezici ezinhle kakhulu ze-HPMC ngokwayo, i-HPMC isetshenziswe kabanzi embonini yezokwakha.

Ukuze kuqhutshekwe nokuhlola indlela yokusebenza phakathi kwe-hydroxypropyl methylcellulose (HPMC) nezinto ezisekelwe usimende, leli phepha ligxile emphumeleni wokuthuthukisa we-Jinshuiqiao hydroxypropyl methylcellulose (HPMC) ezindaweni ezihlangene zezinto ezisekelwe kusimende.

isikhathi sokuqina

Isikhathi sokusetha sikakhonkolo sihlobene ngokuyinhloko nesikhathi sokusetha sikasimende, futhi isamba sinethonya elincane, ngakho-ke isikhathi sokubeka udaka singasetshenziswa esikhundleni sokufunda ithonya le-HPMC ngesikhathi sokubeka ingxube kakhonkolo engaphansi kwamanzi engahlakazeka, ngoba isikhathi sokubeka udaka sithinteka emanzini Ngakho-ke, ukuze kuhlolwe ithonya le-HPMC ngesikhathi sokubeka udaka, kuyadingeka ukulungisa isilinganiso samanzi-samente kanye nesilinganiso sodaka lodaka.

Ngokocwaningo, ukungezwa kwe-HPMC kunomthelela omkhulu wokubuyisela emuva engxubeni yodaka, futhi isikhathi sokumisa udaka sikhula ngokulandelana ngokunyuka kokuqukethwe kwe-HPMC.Ngaphansi kokuqukethwe okufanayo kwe-HPMC, udaka olubunjwe ngaphansi kwamanzi luyashesha kunodaka olwakhiwe emoyeni.Isikhathi sokusetha sokubumba okuphakathi side.Uma kulinganiswa emanzini, uma kuqhathaniswa nesifanekiso esingenalutho, isikhathi sokusetha sodaka oluxutshwe ne-HPMC sibambezeleka ngamahora angu-6-18 ekusethweni kokuqala kanye namahora angu-6-22 ukuze kusethwe okokugcina.Ngakho-ke, i-HPMC kufanele isetshenziswe ngokuhambisana nama-accelerator.

I-HPMC iyi-polymer ephezulu yamangqamuzana enesakhiwo somugqa we-macromolecular kanye neqembu le-hydroxyl eqenjini elisebenzayo, elingakha izibopho ze-hydrogen nama-molecule wamanzi axubile futhi andise i-viscosity yamanzi axubile.Amaketanga amade wamangqamuzana e-HPMC azodonselana, enze ama-molecule e-HPMC ahlangane ukuze akhe uhlaka lwenethiwekhi, ukusonga usimende nokuxuba amanzi.Njengoba i-HPMC yakha isakhiwo senethiwekhi esifana nefilimu futhi isonga usimende, izovimbela ngokuphumelelayo ukuguquguquka kwamanzi odongeni, futhi ivimbele noma inciphise izinga lokugeleza kukasimende.

Ukopha

Ukopha kodaka kufana nokukakhonkolo, okuzodala ukuhlangana okukhulu, okuholela ekwandeni kwesilinganiso sikasimende wamanzi ongqimba oluphezulu lwe-slurry, okubangela ukushwabana kwepulasitiki okukhulu kongqimba oluphezulu lwe-slurry ekuqaleni. esiteji, ngisho nokuqhekeka, namandla ongqimba olungaphezulu lwe-slurry Lubuthakathaka.

Lapho umthamo ungaphezu kuka-0.5%, empeleni akukho mkhuba wokopha.Lokhu kungenxa yokuthi lapho i-HPMC ixutshwa odakeni, i-HPMC inokwakheka kwefilimu kanye nesakhiwo senethiwekhi, futhi ukukhangisa kwamaqembu e-hydroxyl ochungechungeni olude lwama-macromolecules kwenza usimende nokuxuba amanzi odakeni kube ukugeleza, okuqinisekisa ukwakheka okuzinzile. lodaka.Ngemva kokwengeza i-HPMC odakeni, amabhamuza amaningi omoya amancane azimele azokwakhiwa.Lawa mabhamuza omoya azosatshalaliswa ngokulinganayo odakeni futhi avimbele ukubekwa kwe-aggregate.Ukusebenza kobuchwepheshe kwe-HPMC kunomthelela omkhulu ezintweni ezisekelwe kusimende, futhi kuvame ukusetshenziselwa ukulungisa izinto ezintsha eziyinhlanganisela esekwe kusimende njengodaka olomile lwempuphu nodaka lwe-polymer, ukuze ibe nokugcinwa kahle kwamanzi nokugcinwa kwepulasitiki.

Isidingo samanzi odaka

Uma inani le-HPMC lilincane, linomthelela omkhulu esidingweni samanzi sodaka.Endabeni yokugcina izinga lokunwetshwa likadaka olusha lifana ngokuyisisekelo, okuqukethwe kwe-HPMC kanye nesidingo samanzi soguquko loguquko ebudlelwaneni bomugqa phakathi nesikhathi esithile, futhi isidingo samanzi sodaka kuqala sehla bese sikhuphuka. ngokusobala.Lapho inani le-HPMC lingaphansi kuka-0.025%, ngokwenyuka kwenani, isidingo samanzi sodaka siyehla ngaphansi kwezinga elifanayo lokunwetshwa, okukhombisa ukuthi uma inani le-HPMC lilincane, linomthelela wokunciphisa amanzi udaka, futhi i-HPMC inomphumela wokungenisa umoya.Kunenani elikhulu lamabhamuza omoya amancane azimele odakeni, futhi lamabhamuza omoya asebenza njengesithambiso sokuthuthukisa ukugeleza kodaka.Lapho umthamo ungaphezu kuka-0.025%, isidingo samanzi sodaka siyakhula ngokunyuka komthamo.Lokhu kungenxa yokuthi ukwakheka kwenethiwekhi ye-HPMC kuyaqhubeka nokuphelela, futhi igebe phakathi kwama-flocs ochungechungeni olude lwamangqamuzana lifinyezwa, elinomthelela wokukhanga nokubumbana, futhi linciphisa uketshezi lodaka.Ngakho-ke, ngaphansi kwesimo sokuthi izinga lokunwetshwa liyafana ngokuyisisekelo, i-slurry ibonisa ukwanda kwesidingo samanzi.

01. Ukuhlolwa kokumelana nokuhlakazeka:

I-anti-dispersion iyinkomba yezobuchwepheshe ebalulekile yokulinganisa ikhwalithi ye-anti-dispersion agent.I-HPMC iyinhlanganisela ye-polymer encibilika emanzini, eyaziwa nangokuthi i-resin encibilika emanzini noma i-polymer encibilika emanzini.Yandisa ukuhambisana kwengxube ngokwandisa i-viscosity yamanzi okuxuba.Kuyi-hydrophilic polymer material engancibilika emanzini ukwenza isixazululo.noma ukuhlakazeka.

Ukuhlola kubonisa ukuthi lapho inani le-naphthalene-based high-efficiency superplasticizer likhuphuka, ukungezwa kwe-superplasticizer kuzonciphisa ukumelana nokuhlakazeka kodaka lukasimende olusanda kuxutshwa.Lokhu kungenxa yokuthi isinciphisi samanzi esisebenza kahle kakhulu esisekelwe ku-naphthalene siyisisetshenziswa esenziwe nge-surfactant.Lapho isinciphisi samanzi sengezwa odongeni, isinciphisi samanzi sizoqondiswa ebusweni bezinhlayiya ze-samente ukuze wenze ubuso bezinhlayiya ze-cement zibe nenkokhelo efanayo.Lokhu kukhishwa kukagesi kwenza izinhlayiya ze-cement zenze Isakhiwo se-flocculation ye-cement sihlakazwa, futhi amanzi ahlanganiswe esakhiweni akhululwa, okuzobangela ukulahlekelwa ingxenye yesimenti.Ngesikhathi esifanayo, kutholakala ukuthi ngokwanda kokuqukethwe kwe-HPMC, ukumelana nokuhlakazeka kodaka olusha lukasimende kuba ngcono futhi kuba ngcono.

02. Izici zamandla zikakhonkolo:

Kuphrojekthi yesisekelo sokuhlola, kwasetshenziswa ingxube kakhonkolo engahlakazeka ngaphansi kwamanzi ye-HPMC, futhi izinga lamandla okuklama lalingu-C25.Ngokusho kokuhlolwa okuyisisekelo, inani likasimende lingama-400kg, intuthu ye-silica ehlanganisiwe ingu-25kg/m3, inani eliphelele le-HPMC liyi-0.6% yenani likasimende, isilinganiso samanzi-samende ngu-0.42, isilinganiso sesihlabathi singama-40%. kanye nokuphuma kwe-naphthalene-based high-efficiency reducer water is Inani likasimende liyi-8%, isilinganiso samandla angama-28d esifanekiso sikakhonkolo esisemoyeni singama-42.6MPa, amandla amaphakathi angama-28d kakhonkolo ongaphansi kwamanzi anobude obungama-60mm. emanzini angu-36.4MPa, futhi isilinganiso samandla sikakhonkolo owakhiwe ngamanzi ku-concrete owenziwe ngomoya singama-84.8 %, umphumela ubaluleke kakhulu.

03. Ukuhlola kubonisa:

(1) Ukwengezwa kwe-HPMC kunomphumela osobala wokuhlehlisa ingxube yodaka.Ngokukhuphuka kokuqukethwe kwe-HPMC, isikhathi sokusetha sodaka sinwetshwa ngokulandelana.Ngaphansi kokuqukethwe okufanayo kwe-HPMC, udaka olwakhiwe ngaphansi kwamanzi luyashesha kunalolo olwakhiwe emoyeni.Isikhathi sokusetha sokubumba okuphakathi side.Lesi sici sinenzuzo ngokumpompa ukhonkolo ngaphansi kwamanzi.

(2) Udaka lukasimende olusanda kuxutshwa oluxutshwe ne-hydroxypropyl methylcellulose lunezinto ezinhle zokuhlangana futhi cishe alukophi.

(3) Inani le-HPMC kanye nesidingo samanzi sodaka kwehle kuqala kwase kukhuphuka ngokusobala.

(4) Ukufakwa kwe-ejenti yokunciphisa amanzi kuthuthukisa inkinga yokwanda kwesidingo samanzi sodaka, kodwa umthamo wawo kufanele ulawulwe ngendlela enengqondo, ngaphandle kwalokho ukumelana nokuhlakazeka ngaphansi kwamanzi kodaka lukasimende olusanda kuxutshwa kuyoncipha.

(5) Kunomehluko omncane esakhiweni phakathi kwesifanekiso sokunamathisela usimende esixutshwe ne-HPMC kanye nesifanekiso esingenalutho, futhi kunomehluko omncane esakhiweni nasekumitheni kwesifanekiso sikasimende sokunamathisela esithelwa emanzini nasemoyeni.Isifanekiso esakhiwe ngaphansi kwamanzi izinsuku ezingama-28 sicwebile kancane.Isizathu esiyinhloko ukuthi ukungezwa kwe-HPMC kunciphisa kakhulu ukulahlekelwa nokuhlakazeka kukasimende lapho uthela emanzini, kodwa ngesikhathi esifanayo kunciphisa ukubumbana kukasimende.Kuphrojekthi, ngaphansi kwesimo sokuqinisekisa umphumela wokungahlakazeka ngaphansi kwamanzi, umthamo we-HPMC kufanele uncishiswe ngangokunokwenzeka.

(6) Ukwengeza ingxube kakhonkolo engahlakazeka ngaphansi kwamanzi i-HPMC, ukulawula umthamo kunenzuzo emandleni.Iphrojekthi yokuhlola ibonisa ukuthi isilinganiso samandla kakhonkolo owakhiwe ngamanzi kanye nokhonkolo owakhiwe ngomoya singama-84.8%, futhi umphumela ubaluleke kakhulu.