Inani lokuxuba le-ejenti yokunciphisa amanzi lidlula inani elivamile lokuxuba izikhathi eziningana, futhi ithonya layo ekusebenzeni kokhonkolo kufanele linqunywe ngokusho kwesimo esithile.
Esimweni sokuqala, ku-ultra-high-strength ukhonkolo, ngoba isilinganiso se-water-binder singu-≤0.3 noma ngisho siphansi njenge-0.2, ngokuvamile kubonisa ukuthi isimo sekhonkrithi asizwelani nenanii-ejenti yokunciphisa amanzi. Ukuze kuzuzwe isimo esihle se-fluidity, amanzi ayancipha. Umthamo we-ejenti uvame izikhathi ezingama-5-8 kunomthamo ojwayelekile, okungukuthi, umthamo we-ejenti.i-polycarboxylic acididinga ukufinyelela ku-5% -8%. Ngokhonkolo ongaphansi kwe-C50, okuqukethwe okuphezulu okunjalo kuyamangalisa. Kodwa-ke, imiphumela yokuhlolwa ibonisa ukuthi amandla kakhonkolo eminyakeni yobudala athuthuka kahle ngaphansi kwalesi samba, futhi amandla kakhonkolo angama-28d alungiswa ngala mandla angaphezu kuka-100MPa.
Isizathu ukuthi: ukuhlakazeka kwei-ejenti yokunciphisa amanzikusimende i-adsorption ebonakalayo kuphela.I-ejenti yokunciphisa amanziama-molecule adsorbed phezu kwezinhlayiya zikasimende. Ngokuvinjelwa kwe-steric kanye ne-electrostatic repulsion, isakhiwo se-flocculation yezinhlayiya zikasimende siyahlakazeka futhi kukhishwe amanzi amahhala. , Ngaleyo ndlela kwandisa uketshezi lukakhonkolo, futhi ngenxa yesakhiwo sayo esikhethekile esimise okwekama, ii-polycarboxylic acidokusekelwei-ejenti yokunciphisa amanziingavimbela izinhlayiya zikasimende ukuthi zingaphinde zihlangane phakathi nesikhathi esithile, ngakho-ke inokugcina ukusebenza okuhle kokwehla. Uma isikhathi esithile sesidlulile, umkhiqizo we-cement hydration uzosonga ngokuphelelei-ejenti yokunciphisa amanziama-molecule akhangiswa ebusweni bezinhlayiya zikasimende. Ngemva kwei-ejenti yokunciphisa amanziama-molecule ayavikelwa, ukuhlakazeka kuyanyamalala ngokuphelele, bese kungasekho mphumela noma ithonya kukhonkolo. Usimende ngokuvamile amanzi Amandla kakhonkolo akhula ngokujwayelekile.
Yiqiniso, ngenxa yokuqukethwe okuphezulu kwei-ejenti yokunciphisa amanzi, ukugxila kwei-ejenti yokunciphisa amanziama-molecule akukhonkolo makhulu. Ngemva kokuba amanye ama-molecule embozwe imikhiqizo kasimende ye-hydration, ama-molecule amasha akhangiswa phezu kwemikhiqizo ye-cement hydration, ukuvimbela izinhlayiya zikasimende ukuthi zingagqoki ngokushesha. Inethiwekhi iyakhiwa, enweba isikhathi sokusetha ngokwezinga elithile, kodwa ukulungiselelwa kukasimende okujwayelekile ngeke kudlule u-24h.
Esimweni sesibili, i-i-ejenti yokunciphisa amanziyona ngokwayo inezinto ezithile zokungenisa umoya kanye nokuhlehlisa, futhi izikhathi ezimbalwa zokuxutshwa ngokweqile kungase kube nomthelela omubi kakhulu ekusebenzeni kukakhonkolo. Ngokuvamile, inani lengxenye yokubuyisela emuva linqunywa ngokuya ngendawo yokushisa, izidingo zobunjiniyela kanye nomthamo ojwayelekile wei-ejenti yokunciphisa amanzi. I-Adsorption ithinta i-hydration evamile yezinto zikasimende. Esimweni esilula, isikhathi sokusetha sinwetshwa kakhulu, futhi esimweni esibi kakhulu, ukhonkolo ngeke ubeke izinsuku ezimbalwa noma unomphela. Ngokuvamile, ukhonkolo obekwe izinsuku ezingu-2 noma ngaphezulu, ngenxa yokubambezeleka ngokweqile kwenqubo ye-hydration, uhlobo kanye nenani lemikhiqizo ye-hydration izoshintsha, okuholela ekunciphiseni unomphela kwamandla kakhonkolo. Kunjalo, emigwaqweni evalekile yesitimela esingaphansi komhlaba (imvamisa ukusetha kokuqala okungu-72-90h) kanye nokwakhiwa kukakhonkolo obuningi njengezisekelo zenqwaba, amakepisi, amadamu, njll., isikhathi eside sokusetha siyadingeka. Ngokuvamile, izinga lamandla kufanele lenyuke ngokufanele ngesikhathi sokuklanywa kwesilinganiso sokuxuba. Qinisekisa ukuthi amandla angu-28d ahlangabezana nezidingo zedizayini.
I-air-entrainingi-ejenti yokunciphisa amanziis super exutshwe izikhathi eziningana. Uma okuqukethwe komoya kakhonkolo kufaneleka ngesilinganiso esivamile sokuxuba, okuqukethwe komoya kuzokwenyuka kakhulu ngemva kokuxutshwa kakhulu izikhathi ezimbalwa. Udaka lukakhonkolo lucebile ngendlela engavamile, futhi ukhonkolo ulula futhi uyantanta lapho ufosholo, okuyinto engathi sína Lapho ukhonkolo uxega futhi unezimbotshana njengesinkwa, amandla kakhonkolo ancipha kakhulu.
Esimweni sesithathu, noma ngabe i-i-ejenti yokunciphisa amanzingokwayo ayinalo uhlobo lokungenisa umoya noluhlehlisayo, ngemva kokuphindwe kabili, uma ukusetshenziswa kwamanzi kungalungiswanga ngesikhathi, ukusebenza kukakhonkolo omusha kungase konakaliswe kakhulu, okubangele ukucasuka okukhulu. Amanzi, ukuhlukaniswa, ukubamba okuphansi, ukuqina, njll., kanye nokungafanani kahle nokuzinza ngemva kokuthululwa, kanye ne-delamination yangaphakathi, okuholela ekwandeni kwesilinganiso samanzi-to-binder sikakhonkolo ezungeze ibha yensimbi, nokuncipha kwamandla. , okwenza amandla okubamba ensimbi yehle kakhulu. Inani elikhulu lokopha okubangelwa ukuxubana okukhulu kakhulu kuzophinde kuvele ebusweni bukakhonkolo kanye nezingxenye ezithintana ne-formwork, okuholela ekwehleni kwamandla alezi zingxenye, kanye nenani elikhulu lamaphutha afana nokuqhekeka, amakhekheba ezinyosi, kanye nezindawo ezimakiwe zivame ukuvela lapho isikhunta sisuswa, okwenza ikhono lokukhonkolo lokumelana nokuguguleka kwangaphandle Nciphisa kakhulu, kuthinte kakhulu ukuqina kukakhonkolo.
Isikhathi sokuthumela: Dec-02-2021
