Eminyakeni yamuva nje, ukuthuthukiswa okuqhubekayo kobuchwepheshe bokufakwa kodonga lwangaphandle, intuthuko eqhubekayo yobuchwepheshe bokukhiqiza ama-cellulose, kanye nezimpawu ezinhle ze-HPMC uqobo, i-HPMC isetshenziswe kabanzi embonini yezokwakha.
Ukuze uqhubeke nokuhlola indlela yokusebenza phakathi kwezinto zokwakha ze-HPMC ne-Cement, leli phepha ligxile emphumeleni wokuthuthuka kwe-HPMC ngezindawo ezibumbanayo zezinto zokwenza u-Cement-based.
Isikhathi sokugcina
Isikhathi sokubekezela kukakhonkolo sihlobene kakhulu nesikhathi sokusetha sika usimende, futhi i-aggregate ayinalo ithonya, ukuze kuhlolwe ithonya le-HPMC elithintwanga le-HPCS
Ngokusho kokuhlolwa, ukungezwa kwe-HPMC kunomthelela obalulekile wokubuyisa ngengxube kaDitarar, kanye nesikhathi sokuma kodaka ukuze kuphumelele ngokwanda kokuqukethwe kwe-HPMC. Ngaphansi kokuqukethwe okufanayo kwe-HPMC, udaka olungaphansi kwamanzi lushesha kunodaka olumisiwe emoyeni. Isikhathi sokusetha kokubumba okuphakathi isikhathi eside. Uma kulinganiswa emanzini, kuqhathaniswa nesibonakaliso esingenalutho, isikhathi sokubeka udaka oluhlanganiswe ne-HPMC sibambezelwa ngamahora angama-6-18 ukuze kulungiswe ama-6-16 Ngakho-ke, i-HPMC kufanele isetshenziswe ngokuhambisana nama-accelerator.
I-HPMC i-polymer ephezulu ye-moleculate enesakhiwo se-macromolecular eliqondile neqembu le-hydroxyl eqenjini elisebenzayo, elingakha ama-hydrogen bond ngama-molecule wamanzi okuxuba futhi andise ukubonwa kwamanzi okuxubana. Amaketanga amangalisayo ama-HPMC azodonsela omunye komunye, okwenza ama-molecule we-HPMC afakwe komunye nomunye ukwakha isakhiwo senethiwekhi, ukugoqa usimende kanye nokuxuba amanzi. Njengoba i-HPMC yakha isakhiwo senethiwekhi esifana nefilimu futhi isonga usimende, izovimba ngempumelelo ukuguquguquka kwamanzi odongeni, futhi ivimbele noma ijubane linciphise izinga le-hydration kasimende.
-Ophayo
Into yokopha yodaka ifana neyakhonkolo, ezodala indawo ehlanganisiwe, okuholela ekukhuphukeni kwesilinganiso samanzi se-areser esisezingeni eliphakeme kakhulu, futhi kwaze kwaqhekeka, kanye namandla engqimba elingaphezulu kwe-slurry ebuthakathaka.
Lapho umthamo ungaphezulu kuka-0,5%, empeleni akukho nto eyeding. Lokhu kungenxa yokuthi lapho i-HPMC ixutshwe nodaka, i-HPMC inesakhiwo esenziwe ngefilimu nelenethiwekhi, kanye ne-adrorption yamaqembu ama-hydroxyl kwi-macromolecule yenza usimende kanye nokuxuba amanzi ngodaka, kuqinisekisa ukwakheka okuzinzile kodaka. Ngemuva kokungeza i-HPMC ku-mende, kuzokwakhiwa ama-bubble amaningi anezinto ezincane ezizimele. Lawa ma-bubble amoya azosatshalaliswa ngokulinganayo ku-dutar futhi avimbele ukufakwa kokuhlanganiswa. Ukusebenza kwezobuchwepheshe kwe-HPMC kunethonya elikhulu ezintweni ezisetshenziswayo kasimende, futhi kuvame ukusetshenziselwa ukulungiselela izinto ezintsha ezisetshenziswayo ze-composite ezifana nodaka lwamanzi owomile kanye nodaka lwamanzi, ukuze kugcinwe kahle kwamanzi nokugcinwa kwamanzi.
Isidingo samanzi esitsheni
Lapho inani le-HPMC lincane, linethonya elikhulu ekufungweni kwamanzi kodaka. Endabeni yokugcina i-degree yokwanda kodumo omusha ngokufanayo, okuqukethwe kwe-HPMC kanye nokufunwa kwamanzi koshintsho lodaka ebuhlotsheni obuthile ngesikhathi esithile, futhi ukufunwa kwamanzi kodaka kuqala kuncipha. Lapho inani le-HPMC lingaphansi kuka-0,025%, ngokunyuka kwenani, ukufunwa kwamanzi kuncipha ngaphansi kwe-HPMC kuncane, inomphumela oncishisiwe wamanzi, i-HPMC inomphumela wokufaka umoya. Kunenombolo enkulu yama-bubble angezimele amancane owesimende, futhi lezi bublues zomoya zisebenza njengethambisa ukuthuthukisa uketshezi lodaka. Lapho umthamo mkhulu kune-0.025%, ukufunwa kwamanzi kodaka kukhuphuka ngokunyuka komthamo. Lokhu kungenxa yokuthi ukwakheka kwenethiwekhi ye-HPMC kuqediwe futhi, futhi igebe eliphakathi kwama-flocs ku-chain molecular elide lifushane, elinomphumela wokuheha nokubumbana nokubumbana, futhi kunciphise uketshezi lodaka. Ngakho-ke, ngaphansi kwesimo sokuthi izinga lokunwebeka lingafani ngokufanayo, amaSlurry akhombisa ukwanda kokufunwa kwamanzi.
01. Ukuhlolwa kokuphikiswa kokuphikiswa:
I-Anti-Displision iyinkomba ebalulekile yezobuchwepheshe ukukala ikhwalithi ye-ejenti yokuphikiswa. I-HPMC iyingxenye ye-polymer encibilikayo yamanzi, eyaziwa nangokuthi i-resin engenamanzi ye-resin noma i-polymer engenawo amanzi. Kukhulisa ukungaguquguquki kwengxube ngokwandisa i-viscosity yamanzi okuxuba. Kuyinto yezinto ze-hydrophilic polymer ezingancibilika emanzini ukwakha ikhambi. noma ukuhlakazeka.
Ukuhlolwa kukhombisa ukuthi lapho inani le-superplastizer elisezingeni eliphakeme le-Naphpalene likhuphuka, ukwengeza kwe-superplastizer kuzonciphisa ukumelana nokuhlakazwa kodaka olusanda kuxutshwa. Lokhu kungenxa yokuthi i-Naphthalene-based Phenducted Water Surdicer Perfectiser Peagh-Water Perfecticer iyi-surviant. Lapho kunwetshwa amanzi okunciphisa kudaka, ukuncipha kwamanzi kuzothathwa ebusweni bezinhlayiya zokwenza usimende ukwenza ingaphezulu lezinhlayiya zensimbi linecala elifanayo. Lokhu kudalulwa kukagesi kwenza izinhlayiya zosekhulile zikha isimo se-floccation of the usimende, futhi amanzi asongwe esakhiweni akhishwa, okuzodala ukulahleka kwengxenye kasimende. Ngasikhathi sinye, kutholakala ukuthi ngokwanda kokuqukethwe kwe-HPMC, ukumelana nokuhlakazwa kosimende okusha kungcono futhi kube ngcono.
02. Izici zamandla zikakhonkolo:
Kuphrojekthi ye-Pilot Foundation Project, i-HPMC engaphansi kwamanzi engekho emthethweni ayisetshenziswanga, futhi ibanga lamandla okuklama kwakungu-C25. Ngokusho kwesivivinyo esiyisisekelo, inani lesimende lingu-400kg, i-Silica Fume ehlanganisiwe yi-25KG / M3, isilinganiso se-HPMC singu-0.6%, futhi isilinganiso samanzi asuselwa kuso usimende, inani lamanzi asuselwa kumanzi, isilinganiso sama-28D se-concrete specimen ku Umoya u-42.6MPA, amandla ajwayelekile angama-28 kakhonkolo ongaphansi kwamanzi ngokuphakama okungama-60mm angama-36.4MPA, kanye nokulinganiswa kwamandla kokhonkolo owakhiwe ngamanzi kukhonkolo owakhiwa umoya kungu-84.8%, umphumela ubaluleke kakhulu.
03. Umbukiso wokuhlola:
(1) Ukungezwa kwe-HPMC kunomthelela wokubuyisa okusobala kwingxube yodaka. Ngokukhuphuka kokuqukethwe kwe-HPMC, isikhathi sokubeka udaka sinwetshwa ngempumelelo. Ngaphansi kokuqukethwe okufanayo kwe-HPMC, udaka owakhiwe ngaphansi kwamanzi ushesha kunalokho kwakheka emoyeni. Isikhathi sokusetha kokubumba okuphakathi isikhathi eside. Lesi sici sizuzisa ukupompa kokhonkolo ongaphansi kwamanzi.
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(3) Inani le-HPMC kanye nesidingo samanzi sodaka sehle kuqala bese sanda kusobala.
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. I-specimen eyakhiwe ngaphansi kwamanzi izinsuku ezingama-28 i-crisp kancane. Isizathu esiyinhloko ukuthi ukungezwa kwe-HPMC kunciphisa kakhulu ukulahleka nokuhlakazeka kuka usimende lapho uthela emanzini, kepha futhi kunciphisa ukuhlanganiswa kwetshe lesimende. Kuphrojekthi, ngaphansi kwesimo sokuqinisekisa umphumela wokungahlakazwa ngaphansi kwamanzi, umthamo we-HPMC kufanele ancishiswe ngangokunokwenzeka.
. Iphrojekthi ye-Pilot ikhombisa ukuthi isilinganiso samandla ukhonkolo okhethwe ngamanzi no-conkscrete akhiwe ngomoya angama-84.8%, futhi umphumela ubalulekile.
Isikhathi sePosi: Meyi-06-2023