I-Self-Compact Concrete (SCC) ubuchwepheshe besimanje bekhonkrithi obugeleza ngaphansi kwesisindo sawo ukuze bugcwalise ifomu ngaphandle kwesidingo sokudlidliza komshini. Izinzuzo zayo zifaka phakathi ukusebenza okuthuthukisiwe, izindleko zomsebenzi ezincishisiwe, kanye nokusebenza kwesakhiwo okuthuthukisiwe. Ukufeza lezi zici kudinga ukulawulwa okunembile kwengxube, ngokuvamile ngosizo lwezingxube ezifana ne-Hydroxypropyl Methylcellulose (HPMC). Le polymer ye-cellulose ether idlala indima ebalulekile ekuguquleni izakhiwo ze-rheological ze-SCC, ithuthukise ukuzinza kwayo kanye nezici zokugeleza.
Izakhiwo kanye Nemisebenzi ye-HPMC
I-Hydroxypropyl Methylcellulose (HPMC) iyi-polymer engeyona i-ionic, encibilikayo emanzini etholakala ku-cellulose. Izakhiwo zayo ezibalulekile zifaka:
Ukuguqulwa Kokunamathela: I-HPMC ikhulisa ukunamathela kwezixazululo zamanzi, ithuthukisa isimo se-thixotropic sengxube yekhonkrithi.
Ukugcinwa Kwamanzi: Inamandla amahle okugcina amanzi, okusiza ukugcina ukusebenza kahle kwekhonkrithi ngokunciphisa ukuhwamuka kwamanzi.
Ukunamathela Nokubambisana: I-HPMC ithuthukisa ukuhlangana phakathi kwezigaba ezahlukene kukhonkrithi, ithuthukisa izakhiwo zayo zokubambisana.
Ukuthuthukiswa Kokuzinza: Kuqinisa ukumiswa kwama-aggregates engxubeni, kunciphisa ukuhlukaniswa kanye nokopha.
Lezi zakhiwo zenza i-HPMC ibe yinto ewusizo ku-SCC, njengoba ibhekana nezinselele ezivamile njengokuhlukaniswa, ukuphuma kwegazi, kanye nokugcina ukugeleza okufiselekayo ngaphandle kokubeka engcupheni ukuzinza.
Indima ye-HPMC kuKhonkrithi Eziqinisayo
1. Ukuthuthukiswa Kokusebenza Kahle
Umsebenzi oyinhloko we-HPMC ku-SCC ukuthuthukisa ukusebenza kwayo ngokwandisa i-viscosity yengxube. Lokhu kuguqulwa kuvumela i-SCC ukuthi igeleze kalula ngaphansi kwesisindo sayo, igcwalise ifomu eliyinkimbinkimbi futhi ifinyelele izinga eliphezulu lokuxinana ngaphandle kwesidingo sokudlidliza. I-HPMC iqinisekisa ukuthi ukhonkolo uhlala usebenza isikhathi eside, okuzuzisa kakhulu ekuthululweni okukhulu noma okuyinkimbinkimbi.
Ukugeleza: I-HPMC inegalelo ezimpahleni ze-thixotropic zengxube, ivumela ukuthi ihlale imanzi uma ixutshwe kodwa iqine lapho imile. Lokhu kuziphatha kusekela izici ze-SCC zokuzilinganisa, ukuqinisekisa ukuthi igeleza kahle ukuze igcwalise isikhunta futhi ihlanganise imigoqo yokuqinisa ngaphandle kokuhlukanisa.
Ukungaguquguquki: Ngokulawula ukujiya, i-HPMC isiza ukugcina ukungaguquguquki okufanayo kuyo yonke ingxube, iqinisekisa ukuthi ibhetshi ngayinye ye-SCC ibonisa ukusebenza okufanayo maqondana nokugeleza kanye nokuqina.
2. Ukuhlukaniswa Nokulawulwa Kokopha
Ukuhlukaniswa (ukuhlukaniswa kwezinhlanganisela kusuka ku-samente paste) kanye nokopha (amanzi akhuphuka aye phezulu) kuyizinto ezibalulekile ezikhathazayo ku-SCC. Lezi zenzakalo zingalimaza ubuqotho besakhiwo kanye nokuphela kobuso bekhonkrithi.
Ingxube Efanayo: Amandla e-HPMC okwandisa ukujiya kwe-paste yesimende anciphisa ukunyakaza kwamanzi kanye nama-aggregates, ngaleyo ndlela anciphise ingozi yokuhlukaniswa.
Ukopha Okuncishisiwe: Ngokugcina amanzi ngaphakathi kwengxube, i-HPMC isiza ekuvimbeleni ukopha. Lokhu kugcinwa kwamanzi kuqinisekisa nokuthi inqubo yokumanzisa iyaqhubeka ngempumelelo, ithuthukisa ukuthuthukiswa kwamandla nokuqina kwekhonkrithi.
3. Ukuqina Okuthuthukisiwe
I-HPMC inegalelo ekuzinzeni kwe-SCC ngokuthuthukisa ukuhlangana phakathi kwezinhlayiya ezixutshweni. Lokhu kuzinza okuthuthukisiwe kubalulekile ekugcineni ukusatshalaliswa okufanayo kwama-aggregates nokuvimbela ukwakheka kwezikhala noma izindawo ezibuthakathaka.
Ukuhlangana: Uhlobo lokunamathela lwe-HPMC lukhuthaza ukuhlangana okungcono phakathi kwezinhlayiya zesimende kanye nama-aggregates, okuholela ekuhlanganisweni okuhlangene okumelana nokuhlukaniswa.
Ukuzinza: I-HPMC izinzisa isakhiwo esincane sekhonkrithi, ivumela ukusatshalaliswa ngokulinganayo kwama-aggregates futhi ivimbele ukwakheka kwe-laitance (ungqimba olubuthakathaka lwesimende nezinhlayiya ezincane ebusweni).
Umphumela Ezimpahleni Zemishini
1. Amandla Okucindezela
Ithonya le-HPMC emandleni okucindezela e-SCC ngokuvamile lihle. Ngokuvimbela ukuhlukaniswa nokuqinisekisa ingxube efanayo, i-HPMC isiza ukugcina ubuqotho besakhiwo esincane sekhonkrithi, okuholela ezicini zamandla ezingcono.
Ukumanzisa: Ukugcinwa kwamanzi okuthuthukisiwe kuqinisekisa ukumanzisa okuphelele kwezinhlayiya zesimende, okufaka isandla ekuthuthukisweni kwe-matrix eqinile.
Ubuningi Obufanayo: Ukuvimbela ukuhlukaniswa kuphumela ekusabalaleni okufanayo kwama-aggregate, okusekela amandla aphezulu okucindezela futhi kunciphisa ingozi yamaphuzu abuthakathaka.
2. Ukuqina
Ukusetshenziswa kwe-HPMC ku-SCC kuthuthukisa ukuqina kwayo ngokuqinisekisa isakhiwo esincane esiminyene nesifanayo.
Ukuncipha Kokugqwala: Ukuhlangana okuthuthukisiwe kanye nokopha okuncishisiwe kunciphisa ukugqwala kwekhonkrithi, kuthuthukisa ukumelana kwayo nezinto zemvelo ezifana nemijikelezo yokuqandisa, ukuhlaselwa ngamakhemikhali, kanye ne-carbonation.
Ukuqeda Okuthuthukisiwe Komphezulu: Ukuvimbela ukuphuma kwegazi kanye nokuhlukanisa kuqinisekisa ukuqeda komphezulu okubushelelezi nokuqinile, okungathandi ukuqhekeka nokukala.
Okucatshangelwayo mayelana nokusetshenziswa kanye nomthamo
Ukusebenza kahle kwe-HPMC ku-SCC kuncike kumthamo wayo kanye nezidingo ezithile zengxube. Amanani ajwayelekile omthamo asukela ku-0.1% kuya ku-0.5% wesisindo sikasimende, kuye ngezakhiwo ezifunwayo kanye nezici zezinye izingxenye ezingxubeni.
Umklamo Wokuxuba: Umklamo wokuxuba ngokucophelela ubalulekile ukuze kuthuthukiswe izinzuzo ze-HPMC. Izici ezifana nohlobo oluhlanganisiwe, okuqukethwe yi-samente, kanye nezinye izinto ezixubile kumele zicatshangelwe ukuze kufezwe ibhalansi efiselekayo yokusebenza kahle, ukuzinza, kanye namandla.
Ukuhambisana: I-HPMC kumele ihambisane nezinye izingxube ezisetshenziswa kule ngxube, njengezithambisi-ndlela zokulungisa izinto kanye nezinciphisi zamanzi, ukuze kugwenywe ukusebenzisana okubi okungalimaza ukusebenza kwe-SCC.
I-Hydroxypropyl Methylcellulose (HPMC) idlala indima ebalulekile ekuthuthukiseni ukusebenza kwe-Self-Compacting Concrete (SCC). Ikhono layo lokushintsha i-viscosity, ukuthuthukisa ukugcinwa kwamanzi, kanye nokuzinzisa ingxube libhekana nezinselele ezibalulekile ekukhiqizweni kwe-SCC, okuhlanganisa ukuhlukaniswa, ukuphuma kwegazi, kanye nokugcina ukugeleza kwamanzi kugeleza. Ukufakwa kwe-HPMC ku-SCC kuphumela ekuxubeni kwe-concrete okusebenziseka kalula, okuzinzile, futhi okuhlala isikhathi eside, okwenza kube yinto ewusizo ekusetshenzisweni kwe-concrete yesimanje. Isilinganiso esifanele kanye nomklamo wengxube kubalulekile ukuze kusetshenziswe izinzuzo ezigcwele ze-HPMC, ukuqinisekisa ukuthi i-SCC ihlangabezana nezindinganiso ezithile zokusebenza ezidingekayo kumaphrojekthi ahlukahlukene okwakha.
Isikhathi sokuthunyelwe: Juni-18-2024