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-HPMC nezinto ezisekelwe kusimende, leli phepha ligxile emphumeleni wokuthuthukisa we-HPMC ezintweni 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 sokutadisha ithonya le-HPMC ngesikhathi sokubeka ingxube kakhonkolo engaphansi kwamanzi engahlakazeka, ngoba isikhathi sokubeka udaka sithintwa amanzi
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 sokumisa 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 le-hydration likasimende.
Ukopha
Isimo sokopha sodaka siyafana nesikakhonkolo, okuzodala ukuhlangana okuqinile, okuzoholela ekwandeni kwesilinganiso sikasimende wamanzi ongqimba oluphezulu lwe-slurry, okubangela ukuncipha okukhulu kwepulasitiki kongqimba oluphezulu lwe-slurry ekuqaleni, ngisho nokuqhekeka, kanye namandla ongqimba olungaphezulu lwe-slurry lubuthaka.
Lapho umthamo ungaphezu kuka-0.5%, empeleni akukho mkhuba wokopha. Lokhu kungenxa yokuthi uma 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 kodaka. 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 sikadaka. Endabeni yokugcina izinga lokunwetshwa likadaka olusha lifana ngokuyisisekelo, okuqukethwe kwe-HPMC kanye nesidingo samanzi soguquko lodaka ebudlelwaneni bomugqa phakathi nenkathi ethile yesikhathi, futhi isidingo samanzi sikadaka kuqala sehla bese sikhuphuka ngokusobala. Uma inani le-HPMC lingaphansi kuka-0.025%, ngokunyuka kwenani, isidingo samanzi sodaka siyancipha ngaphansi kwezinga elifanayo lokunweba, okubonisa ukuthi uma inani le-HPMC lilincane, linomthelela wokunciphisa amanzi odongeni, futhi i-HPMC inomphumela wokungena emoyeni. 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 nokuhlangana, futhi linciphisa ukugcwala kodaka. 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 sengezwe odakeni, isinciphisi samanzi sizoqondiswa ebusweni bezinhlayiya ze-samente ukwenza ubuso bezinhlayiya ze-samente 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-samente singu-0.42, isilinganiso sesihlabathi singama-40%, kanye nokukhishwa kwe-naphthalene-based high-based high-efficiency Inani lamandla angu-8% okunciphisa amandla angu-8% isifanekiso sikakhonkolo esisemoyeni singama-42.6MPa, amandla amaphakathi angu-28d kakhonkolo ongaphansi kwamanzi anobude obungama-60mm obuconsi bungu-36.4MPa, futhi isilinganiso samandla sikakhonkolo owakhelwe ngamanzi kuya kukhonkolo 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 sokumisa 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 ngezinye izikhathi kuzoncipha.
(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 nokuhlakazwa kukasimende lapho uthela emanzini, kodwa futhi kunciphisa ukubumbana kwetshe likasimende. Kuphrojekthi, ngaphansi kwesimo sokuqinisekisa umphumela wokungahlakazi 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.
Isikhathi sokuthumela: May-06-2023