Kunezici eziningi ezithinta umsebenzi we-fly ash futhi ziyinkimbinkimbi kakhulu. Izici eziyinhloko zokulawula zihlanganisa: ukwakheka kwamakhemikhali (ikakhulukazi isigaba sengilazi); ukwakheka kwengilazi; ukukhubazeka kwamakhemikhali nokomzimba kwephuzu lokuvula engilazini (kuhlanganise nalawo akhiqizwa ngokugaya); amanzi Indima ye-chemical reaction medium; ukusatshalaliswa kosayizi wezinhlayiyana zezinhlayiya. Lapho izinqubo eziningi kulayini wokukhiqiza umlotha wempukane, kulapho umlotha wempukane ukhiqizwa kahle, futhi intengo yomlotha wempukane iyanda. Kodwa ngokuvamile, ingahlukaniswa izigaba ezimbili; eyodwa ikhemikhali, ehilela ngokuyinhloko inani nokwakheka kwezinto ezisebenzayo ezibamba iqhaza futhi zikhuthaze ukusabela kwe-pozzolanic; enye ingokomzimba, ethinta kakhulu inqubo ye-hydration kanye nokuqina kukasimende Isakhiwo samatshe kasimende esakhiwe kamuva.
1. Izici zamakhemikhali
Njengoba isigaba sengilazi ye-silica-alumina siwumthombo oyinhloko womsebenzi wefly umlotha , izici ezinciphisa inani lemizimba yengilazi, njengokulahlekelwa okukhulu ekushiseni kanye nezigaba eziningi zekristalu, aziwuthandi umsebenzi. Ngaphezu kwalokho, ekubunjweni kwesigaba seglasi, izindima zezakhi ezahlukene azifani. Ama-oksidi yizinto ezivame kakhulu phakathifly umlotha , futhi ziyizingxenye eziyinhloko zemikhiqizo ye-hydration. Kodwa-ke, ngaphansi kwezimo ezihlukene zeminyaka nezinga lokushisa, izinga nokubaluleka kwama-oxide abamba iqhaza ekuphenduleni kwe-hydration kuhlukile. Isibonelo, insimbi inganciphisa indawo yokuncibilika komlotha, okuvumela ukwakheka kwama-microbeads engilazi. Kodwa-ke, ngenxa yokuthi i-iron oxide inekhono elibi kakhulu lokubamba iqhaza ekuphenduleni kwe-hydration, ngokuvamile kunenkolelo yokuthi okuqukethwe kwe-iron oxide ngokweqile akulungile ekusebenzeni; inani elincane le-alkali metal oxides lingakhuthaza ukugeleza kwamanzi. Ukusabela kuyenziwa, kodwa uma usebenzisa i-aggregate esebenzayo, okuqukethwe okuphezulu kwe-potassium ne-sodium oxides emlotheni wempukane kuzokhuthaza ukusabela kwe-alkaline aggregate, ngaleyo ndlela kucekele phansi ukuzinza kukakhonkolo; inani elincane lesulfure trioxide emlotheni wempukane Kuzuzisa ukwakheka kwe-hydrated calcium silicate kanye nokwakheka kwe-hydrated calcium sulfoaluminate (ettringite) enomthelela emandleni okuqala, kodwa ukwanda kwe-ettringite kakhulu kuzodala izinkinga zokuzinza kwevolumu, ngakho-ke okuqukethwe kwesulfure trioxide akufanele kube phezulu ku-3%.
2. Izici ezingokomzimba
Izici eziyinhloko ezithinta umsebenzi we-fly ash yi-particle morphology, i-microstructure nezinye izici zomzimba. Ezinhlotsheni ezahlukene zomlotha wezimpukane, imfuneko yamanzi yokungaguquguquki okujwayelekile incane, umsebenzi uyanda; ukuncipha kwekhabhoni, umsebenzi uyanda; ukucoleka okuncane, umsebenzi uyanda; ngokuya nge-particle morphology, ingilazi eyindilinga emlotheni wempukane Uma ukhula, umsebenzi womlotha wezimpukane uyanda. Kusukela kusici se-microstructure E, ifly umlothange-short-chain silicon-oxygen tetrahedral structure inomsebenzi ophezulu.
Indawo ethize ye-fly ash ingabonisa ukwakheka kwezinhlayiyana kanye nesakhiwo somlotha wezimpukane ngokwezinga elithile. Izinhlayiya ezincanyana zomlotha wezimpukane zinendawo ekhudlwana ethize; umzimba wengilazi ocebile nge-calcium unesakhiwo esiminyene nendawo encane ehambisanayo ethile; kunemizimba eminingi yengilazi enezimbotshana. Izimbobo, indawo ethize ehambelana nayo inkulu.
Isikhathi sokuthumela: Mar-15-2022