I-Self-Compacting Concrete (SCC) iwubuchwepheshe besimanje obunokhonkolo obugeleza ngaphansi kwesisindo sabo ukuze ugcwalise umsebenzi ngaphandle kwesidingo sokudlidliza kwemishini. Izinzuzo zayo zihlanganisa ukusebenza okuthuthukisiwe, izindleko ezincishisiwe zabasebenzi, nokusebenza okuthuthukisiwe kwesakhiwo. Ukufeza lezi zici kudinga ukulawula 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 nokugeleza kwayo.
Izakhiwo kanye nemisebenzi ye-HPMC
IHydroxypropyl Methylcellulose (HPMC) iyi-polymer engeyona i-ionic, encibilika emanzini etholakala ku-cellulose. Izici zayo ezibalulekile zifaka:
Ukuguqulwa Kwe-Viscosity: I-HPMC inyusa i-viscosity yezixazululo ezinamanzi, ithuthukisa imvelo ye-thixotropic yengxube kakhonkolo.
Ukugcinwa kwamanzi: Inamandla amahle kakhulu okugcina amanzi, asiza ukugcina ukusebenza kukakhonkolo ngokunciphisa ukuhwamuka kwamanzi.
Ukunamathela Nokubumbana: I-HPMC ithuthukisa ukuhlangana phakathi kwezigaba ezihlukene kukhonkolo, ithuthukisa izici zayo ezihlangene.
Ukuthuthukisa Ukuzinza: Kuzinzisa ukumiswa kwama-aggregates ekuxubeni, kunciphisa ukuhlukaniswa nokopha.
Lezi zakhiwo zenza i-HPMC ibe isithasiselo esibalulekile ku-SCC, njengoba ibhekana nezinselele ezivamile ezifana nokuhlukaniswa, ukopha, nokugcina ukugeleza okufunayo ngaphandle kokubeka engcupheni ukuzinza.
Iqhaza le-HPMC ku-self-Compacting Concrete
1. Ukuthuthukiswa Kokusebenza
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 lokuhlangana ngaphandle kwesidingo sokudlidliza. I-HPMC iqinisekisa ukuthi ukhonkolo uhlala usebenza isikhathi eside, okuzuzisa kakhulu ukuthululwa okukhulu noma okuyinkimbinkimbi.
Ukugeleza: I-HPMC inikela ezintweni ze-thixotropic zemiksi, eyivumela ukuthi ihlale iwuketshezi lapho ixutshwe kodwa ijiyile lapho imile. Lokhu kuziphatha kusekela izici zokuzilinganisa ze-SCC, iqinisekisa ukuthi ihamba kahle ukuze igcwalise izibungu futhi ihlanganise imigoqo yokuqinisa ngaphandle kokuhlukaniswa.
Ukungaguquguquki: Ngokulawula i-viscosity, i-HPMC isiza ukugcina ukufana okufanayo kuyo yonke ingxube, iqinisekisa ukuthi iqoqo ngalinye le-SCC libonisa ukusebenza okungaguquki ngokuya ngokugeleza nokuzinza.
2. Ukuhlukanisa kanye Nokulawula Kokopha
Ukwehlukaniswa (ukuhlukaniswa kwamaqoqo kusimende unama) nokopha (amanzi akhuphukela phezulu) kuwukukhathazeka okubalulekile ku-SCC. Lezi zenzakalo zingaphazamisa ubuqotho besakhiwo kanye nokuqedwa kwengaphezulu kukakhonkolo.
I-Homogeneous Mix: Ikhono le-HPMC lokukhulisa i-viscosity yokunamathisela usimende kunciphisa ukunyakaza kwamanzi namaqoqo, ngaleyo ndlela kunciphisa ubungozi bokuhlukaniswa.
Ukopha Okuncishisiwe: Ngokugcina amanzi ngaphakathi kwengxube, i-HPMC isiza ukuvimbela ukopha. Lokhu kugcinwa kwamanzi futhi kuqinisekisa ukuthi inqubo ye-hydration iyaqhubeka ngokuphumelelayo, ithuthukisa ukuthuthukiswa kwamandla nokuqina kokhonkolo.
3. Ukuzinza Okuthuthukisiwe
I-HPMC inomthelela ekuzinzeni kwe-SCC ngokwenza ngcono ukuhlangana phakathi kwezinhlayiya ekuxubeni. Lokhu kuzinza okuthuthukisiwe kubalulekile ekugcineni ukusabalalisa okufanayo kwama-aggregate nokuvimbela ukwakheka kwama-voids noma izindawo ezibuthakathaka.
Ukubumbana: Imvelo yokunamathela ye-HPMC ikhuthaza ukubopha okungcono phakathi kwezinhlayiya ze-cement nama-aggregates, okuholela ekuxubeni okuhlangene okuphikisana nokuhlukaniswa.
Ukuzinzisa: I-HPMC iqinisa i-microstructure kakhonkolo, ivumela ngisho nokusatshalaliswa kwama-aggregate futhi ivimbele ukwakheka kwe-laitance (ungqimba olubuthakathaka lukasimende nezinhlayiya ezinhle phezulu).
Umthelela Ezimpahleni Zemishini
1. Amandla Acindezelayo
Umthelela we-HPMC emandleni acindezelayo e-SCC ngokuvamile muhle. Ngokuvimbela ukuhlukaniswa nokuqinisekisa ukuxutshwa okufanayo, i-HPMC isiza ukugcina ubuqotho besakhiwo esincane sikakhonkolo, okuholela ezicini zamandla ezingcono.
I-Hydration: Ukugcinwa kwamanzi okuthuthukisiwe kuqinisekisa ukugeleza okuphelele okwengeziwe kwezinhlayiya zikasimende, okunomthelela ekuthuthukisweni kwe-matrix enamandla.
Ukuminyana Okufanayo: Ukuvinjelwa kokuhlukaniswa kuphumela ekusabalaliseni okufanayo kwama-aggregate, okusekela amandla aphezulu okucindezela futhi kunciphisa ubungozi bamaphuzu abuthakathaka.
2. Ukuqina
Ukusetshenziswa kwe-HPMC ku-SCC kuthuthukisa ukuqina kwayo ngokuqinisekisa ukuthi i-microstructure eminyene futhi efana kakhulu.
Ukunciphisa Ukungakwazi Ukungena: Ukubumbana okuthuthukisiwe nokopha okuncishisiwe kunciphisa ukungena kukakhonkolo, kukhuphule ukumelana kwawo nezinto ezizungezile njengemijikelezo yokuqhwaza, ukuhlasela kwamakhemikhali, kanye ne-carbonation.
I-Surface Enhanced Finish: Ukuvimbela ukopha nokuhlukaniswa kuqinisekisa isiphetho esibushelelezi nesihlala isikhathi eside, esingajwayele ukuqhekeka nokusika.
Ukucatshangelwa kwesicelo kanye Nesilinganiso
Ukusebenza kwe-HPMC ku-SCC kuncike esilinganisweni sayo kanye nezidingo ezithile zemiksi. Amazinga omthamo ajwayelekile asukela ku-0.1% kuya ku-0.5% wesisindo sikasimende, kuye ngezakhiwo ezifunwayo kanye nezici zezinye izingxenye zengxube.
I-Mix Design: Idizayini yokucophelela yokuhlanganisa ibalulekile ukuze kuthuthukiswe izinzuzo ze-HPMC. Izinto ezifana nohlobo oluhlanganisiwe, okuqukethwe usimende, nezinye izixube kufanele kubhekwe ukuze kuzuzwe ibhalansi efiselekayo yokusebenza, ukuzinza, namandla.
Ukuhambisana: I-HPMC kufanele ihambisane nezinye izixube ezisetshenziswa ekuxubeni, njengama-superplasticizers nezinciphisi zamanzi, ukuze kugwenywe ukusebenzisana okubi okungafaka engozini ukusebenza kwe-SCC.
IHydroxypropyl Methylcellulose (HPMC) idlala indima ebalulekile ekuthuthukiseni ukusebenza kwe-Self-Compacting Concrete (SCC). Ikhono layo lokuguqula i-viscosity, ukuthuthukisa ukugcinwa kwamanzi, kanye nokuzinzisa ingxube ibhekana nezinselele ezibalulekile ekukhiqizeni kwe-SCC, okuhlanganisa ukuhlukaniswa, ukopha, nokugcina ukugeleza. Ukufakwa kwe-HPMC ku-SCC kubangela ingxube kakhonkolo esebenza kakhudlwana, ezinzile, futhi ehlala isikhathi eside, okuyenza ibe isithasiselo esibalulekile sezinhlelo zokusebenza zesimanjemanje. Umthamo ofanele kanye nomklamo wengxube kubalulekile ukuze kusetshenziswe izinzuzo ezigcwele ze-HPMC, kuqinisekiswe ukuthi i-SCC ihlangabezana nemibandela ethile yokusebenza edingekayo kumaphrojekthi wokwakha ahlukahlukene.
Isikhathi sokuthumela: Jun-18-2024