Fly Ash Portland Cement

I-Portland Cement
Fly umlothaI-portland Cement isho inhlanganisela ye-Portland Cement clinker kanye ne-fly ash, exutshwe nenani elifanele le-gypsum bese eyagaywa, ebizwa ngokuthi PF Usimende wasePortland, obhalwe ngekhodi PF Inani lomlotha wezimpukane owengezwe kusimende ungama-20% ~ 40% ngobuningi, futhi izinga lawo lamandla kanye nezidingo zamandla eminyakeni yobudala ngayinye ziyafana nalezo zikasimende we-slag Portland.

Impahla eluhlaza
Yenziwe nge-Portland Cement clinker futhifly umlotha , ixutshwe nenani elifanele le-gypsum bese igaywa. Ikhodi ye-PF
Noma iyiphi i-hydraulic cementitious material eyenziwe nge-Portland Cement clinker, umlotha wempukane kanye nenani elifanele le-gypsum ground ibizwa ngokuthi i-fly ash Portland Cement, ebhalwe ngekhodi PF Inani lomlotha wezimpukane owengezwe kusimende ungama-20% kuya ku-40% ngobuningi. Kuvunyelwe ukubamba iqhaza ku-granulated blast furnace slag engadluli i-1/3 yenani eliphelele lezinto ezixubile. Ngalesi sikhathi, inani eliphelele lezinto ezixubile lingafinyelela ku-50%, kodwa inani le-fly ash akufanele libe ngaphansi kuka-20% noma ngaphezulu kuka-40%.
Izici
Isakhiwo se-fly ash Cement siminyene ngokuqhathaniswa, indawo ethile yangaphakathi yangaphakathi incane, futhi umthamo wokukhangisa wamanzi uncane kakhulu, futhi isidingo samanzi se-cement hydration sincane, ngakho-ke ukuncipha okomile kukasimende we-fly ash kuncane, futhi ukumelana nokuqhekeka nakho kuphansi. kuhle. Ngaphezu kwalokho, efana nosimende ojwayelekile oxutshwe nezixube ezisebenzayo, unokushisa okuphansi kwe-hydration nokumelana nokugqwala okuqinile.
Ukusebenza
Izakhiwo ezihlukile ze-fly ash Portland Cement zimi kanje:
(1) Amandla okuqala aphansi, futhi izinga lokukhuphuka kwamandla sekwephuzile likhulu: amandla okuqala kasimende omlotha wempukane aphansi, futhi amandla okuqala ancipha kakhulu ngokwanda kokuqukethwe komlotha wezimpukane. Ngenxa yokuthi umzimba we-vitreous osemlotheni wezimpukane uzinze ngokwedlulele, izinhlayiya zomlotha wempukane ziyaguguleka futhi zibhujiswe kancane kakhulu yi-Ca(OH)2 ngesikhathi senqubo yokufakwa kwe-hydration ye-fly ash simende, ngakho-ke ukuthuthukiswa kwamandla kasimende we-fly ash kubonakala kakhulu kamuva. esiteji. , izinga layo lokunyuka kwamandla sekwephuzile likhulu, futhi lingadlula ngisho namandla asekupheleni kukasimende wasePortland ohambisanayo.
(2) Ukusebenza okuhle nokushwabana okuncane okomile: Ngenxa yokuthi iningi lezinhlayiya zomlotha wempukane zivaliwe futhi ziyindilinga eqinile, futhi indawo yangaphakathi yangaphakathi namanzi e-adsorption ye-molecule eyodwa mancane, usimende womlotha wempukane unokusebenza okuhle kanye nokushwabana okuncane okomile. , inezici zamandla aqinile aphezulu kanye nokumelana nokuqhekeka okuhle. Lokhu kuyinzuzo ecacile ye-fly ash simende.
(3) Ukumelana nokugqwala okuhle: usimende we-fly ash unokumelana nokugqwala okuphezulu emanzini ahlanzekile ne-sulfate. Ngenxa yenhlanganisela ye-SiO2 esebenzayo ku-fly ash ne-Ca(OH)2, i-calcium silicate hydrate ikhiqizwa lapho ibhalansisiwe. Ukugxila komkhawulo odingekayo (okungukuthi isigaba se-alkalinity ye-liquid) siphansi kakhulu kunaleyo edingekayo ekulinganiseni kwe-calcium silicate hydrate kusimende ojwayelekile wase-Portland, ngakho izinga lokugeleza emanzini ahlanzekile liyancipha kakhulu, ngaleyo ndlela kuthuthukisa ukumelana nosimende. Ikhono lokugqwala kwamanzi ahlanzekile kanye nokumelana nokulimala kwe-sulfate.
(4) Ukushisa okuphansi kwe-hydration: Ijubane le-hydration le-fly ash simenti lihamba kancane futhi ukushisa kwe-hydration kuphansi, ikakhulukazi uma inani lomlotha wempukane ongeziwe likhulu, ukuncipha kokushisa kwe-hydration kusobala kakhulu.

Portland usimende
Wonke ama-clinker kasimende e-Portland ikakhulukazi akhiwe nge-calcium silicate, i-limestone noma i-granulated blast furnace slag engaphansi kuka-5%, kanye nezinto zikasimende ezisebenza ngogesi ezenziwe ngegypsum yomhlabathi ocolekile zibizwa ngokuhlanganyela ngokuthi usimende wasePortland. Ihlanganiswe emhlabeni wonke njengePortland Cement.
Ukwahlukanisa
I-Portland Cement ihlukaniswe yaba izinhlobo ezimbili, uhlobo I-Portland Cement ngaphandle kwezinto ezixubile kuthiwa yi-Portland Cement, ikhodi P · I; into exutshwe ne-limestone noma i-granulated blast furnace slag engadluli u-5% wesisindo sikasimende ibizwa ngokuthi I-II Type Portland Cement, ikhodi P·Ⅱ.
Ukwakheka kwamaminerali
Ukwakhiwa kwamaminerali okuyinhloko kukasimende wase-Portland: i-tricalcium silicate, i-dicalcium silicate, i-tricalcium aluminate, ne-tetracalcium ferric aluminate. I-Tricalcium silicate inquma amandla kasimende wasePortland phakathi kwamasonto amane; i-dicalcium silicate isebenzisa amandla ayo kuphela ngemva kwamasonto amane, futhi ifinyelela amandla e-tricalcium silicate amasonto amane cishe ngonyaka; amandla e-tricalcium aluminate Isebenza ngokushesha, kodwa amandla aphansi, futhi idlala indima ethile emandleni e-Portland usimende phakathi kwe-1 kuya kwezinsuku ezingu-3 noma isikhathi eside; Umnikelo wamandla we-asidi kasawoti usimende mncane.