Umhla wokuThumela: 26, Agasti, 2024
1. Ukubunjwa kwamaminerali
Izinto eziphambili zingumxholo weC3A kunye neC4AF. Ukuba umxholo wala macandelo uphantsi, ukuhambelana kwesamente kunye nesinciphisi samanzi kuya kuba kuhle, phakathi kwayo i-C3A inefuthe elinamandla kwi-adaptation. Oku kungenxa yokuba isinciphisi samanzi kuqala sibhengeza iC3A kunye neC4AF. Ukongeza, ireyithi ye-hydration ye-C3A yomelele kunaleyo ye-C4AF, kwaye iyanda ngokunyuka kokucoleka kwesamente. Ukuba amacandelo amaninzi e-C3A aqulethwe kwi-samente, iya kukhokelela ngokuthe ngqo kwixabiso elincinci lamanzi elichithwe kwi-sulfate, okubangela ukuhla kwe-sulfate ions eveliswayo.
2. Ukulunga
Ukuba i-samente ilungile, indawo yayo ethile iya kuba yinto enkulu, kwaye umphumo we-flocculation uya kubonakala ngakumbi. Ukuze ugweme esi sakhiwo se-flocculation, umlinganiselo othile wokunciphisa amanzi kufuneka wongezwe kuwo. Ukuze ufumane umphumo owaneleyo wokuhamba, kuyimfuneko ukwandisa ukusetyenziswa kokunciphisa amanzi kwinqanaba elithile. Kwiimeko eziqhelekileyo, ukuba i-samente ilungile, indawo ethile yendawo ye-samente iphezulu, kwaye impembelelo yokunciphisa amanzi kwixabiso eligcweleyo le-cement liya kwanda, okwenza kube nzima ukuqinisekisa ubuninzi be-cement paste. Ngoko ke, kwinkqubo yangempela yokuqulunqa ikhonkrithi kunye nomlinganiselo ophezulu we-samente yamanzi, umlinganiselo wamanzi ukuya kwindawo kufuneka ulawulwe ngokucophelela ukuze kuqinisekiswe ukuba i-samente kunye nabanciphisi bamanzi banokuguquguquka okunamandla.
3. Ukuhlelwa kwamasuntswana esamente
Impembelelo ye-cement particle grading kwi-sement adaptability ibonakaliswe ngokukodwa kwintlukwano kumxholo wepowder ecocekileyo kwiinqununu ze-samente, ngokukodwa umxholo weengqungquthela ezingaphantsi kwe-3 microns, enefuthe elithe ngqo kwi-adsorption yokunciphisa amanzi. Umxholo weengqungquthela ezingaphantsi kwe-3 microns kwi-samente zihluka kakhulu kunye nabavelisi be-samente abahlukeneyo, kwaye ngokuqhelekileyo isasazwa phakathi kwe-8-18%. Emva kokusebenzisa inkqubo yokugaya i-open-flow flow, indawo ethile yendawo yesamente iphuculwe kakhulu, enempembelelo ethe ngqo ekuguquguqukeni kwesamente kunye nabanciphisi bamanzi.
4. Ukujikeleza kwamasuntswana esamente
Zininzi iindlela zokuphucula ukujikeleza kwesamente. Ngaphambili, amasuntswana esamente ayedla ngokucolwa ukuze aphephe imiphetho yokusila neekona. Nangona kunjalo, kwinkqubo yokusebenza kwangempela, inani elikhulu leengqungquthela ze-powder ezintle zilungele ukubonakala, ezinempembelelo echanekileyo kakhulu ekusebenzeni kwesamente. Ukuze kulungiswe ngokufanelekileyo le ngxaki, iteknoloji yokugaya ibhola yensimbi ejikelezileyo ingasetyenziswa ngokuthe ngqo, enokuphucula kakhulu i-spheroidization yamasuntswana e-samente, ukunciphisa ilahleko yokusebenza, kunye nokunciphisa ixesha lokugaya i-samente. Emva kokujikeleza kwamasuntswana esamente kuphuculwe, nangona isiphumo kwidosi egcweleyo yesinciphisi samanzi ayinkulu kakhulu, inokuphucula ulwelo lokuqala lwencama yesamente ukuya kumlinganiselo omkhulu. Esi siganeko siya kubonakala ngakumbi xa umlinganiselo wokunciphisa amanzi osetyenzisiweyo uncinci. Ukongezelela, emva kokuphucula ukujikeleza kwamaqhekeza e-samente, umbane we-cement paste unokuphuculwa kwinqanaba elithile.
5. Izinto ezixubileyo
Kusetyenziso lwangoku lwesamente kwilizwe lam, ezinye izixhobo zihlala zixutywa kunye. Ezi zixhobo ezixubileyo zihlala zibandakanya i-blast furnace slag, i-fly ash, i-coal gangue, i-zeolite powder, i-limestone, njl. Emva kokusebenza okuninzi, kuye kwaqinisekiswa ukuba ukuba isinciphisi samanzi kunye nomlotha wempukane zisetyenziswa njengezinto ezixubileyo, ukulungelelaniswa kakuhle kwesamente kunokulungelelanisa. kufunyanwa. Ukuba uthuthu lwentaba-mlilo kunye negangue yamalahle zisetyenziswa njengezinto ezixubeneyo, kunzima ukufumana ukulungelelaniswa okuhle kokuxutywa. Ukuze ufumane umphumo ongcono wokunciphisa amanzi, isinciphisi samanzi amaninzi siyafuneka. Ukuba i-fly ash okanye i-zeolite ibandakanyiwe kwizinto ezixubeneyo, ilahleko ekutshiseni inxulumene ngokuthe ngqo nokucoleka kothuthu lwentaba-mlilo. Okukhona ilahleko encinci ekutshisweni, kokukhona kufuneka amanzi amaninzi, kwaye kokukhona inyuka ipropathi yothuthu lwentaba-mlilo. Emva kokuziqhelanisa okuninzi, kubonakaliswe ukuba ukuziqhelanisa nezinto ezixutyiweyo kwisamente kunye nearhente yokunciphisa amanzi kubonakaliswa ikakhulu kule miba ilandelayo: ① Ukuba i-slag isetyenziselwa ukubuyisela intlama yesamente, ukuguquguquka kwentlama kuya kuba namandla njengoko izinga lokutshintsha linyuka. ② Ukuba i-fly ash isetyenziselwa ngokuthe ngqo ukutshintsha intlama yesamente, ukumanzi kwayo kokuqala kunokuncitshiswa kakhulu emva kokuba ukutshintshwa kwezinto kudlule i-30%. ③ Ukuba i-zeolite isetyenziselwa ngokuthe ngqo ukufaka indawo yesamente, kulula ukubangela ukungonelanga kokuqala kwe-paste. Kwiimeko eziqhelekileyo, ngokunyuka kwezinga lokutshintshwa kwe-slag, ukugcinwa kokuhamba kwe-cement paste kuya kwandiswa. Xa i-fly ash inyuka, isantya sokuhamba kwelahleko ye-paste iya kunyuka ukuya kumlinganiselo othile. Xa izinga lokutshintshwa kwe-zeolite lidlula i-15%, ukulahleka kokuhamba kwe-paste kuya kubonakala kakhulu.
6. Isiphumo sohlobo lwe-admixture kwi-fluidity ye-cement paste
Ngokudibanisa inxalenye ethile ye-admixtures kwikhonkrithi, amaqela e-hydrophobic of admixtures aya kuba yi-adsorbed ye-directional kwi-surface ye-cement particles, kwaye amaqela e-hydrophilic aya kubhekisela kwisisombululo, ngaloo ndlela enze ngokufanelekileyo ifilimu ye-adsorption. Ngenxa yempembelelo ye-adsorption ye-admixture, umphezulu weengqungquthela ze-samente uya kuba neentlawulo zophawu olufanayo. Ngaphantsi kwefuthe leentlawulo ezifana nokugxotha omnye komnye, isamente iya kwenza ukusasazwa kwesakhiwo esijikelezayo kwinqanaba lokuqala lokongezwa kwamanzi, ukuze isakhiwo se-flocculent sikhutshwe emanzini, ngaloo ndlela siphucula ubuninzi bomzimba wamanzi ukuya kwindawo ethile. ububanzi. Xa kuthelekiswa nezinye ii-admixtures, eyona nto iphambili ye-polyhydroxy acid admixtures kukuba banokwenza amaqela aneempembelelo ezahlukeneyo kwikhonkco eliphambili. Ngokubanzi, imixube ye-hydroxy acid inempembelelo enkulu kubuninzi besamente. Kwinkqubo yokulungiselela ikhonkrithi ephezulu, ukongeza umlinganiselo othile we-polyhydroxy acid admixtures unokufikelela kwimiphumo engcono yokulungiselela. Nangona kunjalo, kwinkqubo yokusebenzisa i-polyhydroxy acid admixtures, ineemfuno eziphezulu kakhulu ekusebenzeni kwemathiriyeli yesamente ekrwada. Ekusetyenzisweni kwangempela, umxube uthambekele kwi-viscosity kwaye unamathele ezantsi. Ekusetyenzisweni kamva kwesakhiwo, kukwathandeka kumanzi amdaka kunye ne-stratification. Emva kokudilizwa, iyakwazi nokuba noburhabaxa, imigca yesanti, kunye nemingxuma yomoya. Oku kuhambelana ngokuthe ngqo nokungahambelani kwe-polyhydroxy acid admixtures kunye ne-samente kunye ne-mineral admixtures. Ii-admixtures ze-Polyhydroxy acid zezona zidityanisiweyo zikwazi ukuziqhelanisa kakhulu nesamente phakathi kwazo zonke iintlobo zemixube.
Ixesha lokuposa: Aug-26-2024
