Ama-cellulose ethers awuhlobo lwezinhlanganisela ze-organic polymer eziguqulwe ngamakhemikhali zisuka ku-cellulose yemvelo. Zivame ukusetshenziswa ezintweni zokwakha, ikakhulukazi ezintweni ezisekelwe kusimende. Umthelela we-cellulose ether ohlelweni lwe-cement hydration ubonakala ngokuyinhloko kulezi zici ezilandelayo: ukuhlakazwa kwezinhlayiya zikasimende, ukugcinwa kwamanzi, umphumela wokuqina, kanye nomthelela ku-morphology nokuthuthukiswa kwamandla kwemikhiqizo ye-cement hydration.
1. Isingeniso se-cement hydration
Inqubo ye-hydration kasimende iwuchungechunge lokusabela okuyinkimbinkimbi ngokomzimba namakhemikhali phakathi kukasimende namanzi. Lokhu kusabela kubangela ukuba unamathisele usimende uqine kancane kancane ukuze wakhe isakhiwo esiqinile, ekugcineni ukhiqize imikhiqizo ye-hydration efana ne-calcium silicate hydrate (CSH) ne-calcium hydroxide (CH). Phakathi nale nqubo, izinga lokuphendula kwe-hydration likasimende, uketshezi nokugcinwa kwamanzi kwe-slurry, nokwakhiwa kwemikhiqizo ye-hydration kuthinta ngokuqondile amandla nokuqina kokhonkolo wokugcina.
2. Indlela yokusebenza ye-cellulose ethers
I-Cellulose ether idlala indima ebalulekile yokulawula ngokomzimba namakhemikhali enqubweni yokufaka usimende. I-cellulose ether ithinta ikakhulukazi inqubo ye-hydration kasimende ngezindlela ezimbili: enye iwukuthinta ukusatshalaliswa nokuhwamuka kwamanzi odaka lukasimende; enye ingokuthinta ukuhlakazeka kanye nokuhlangana kwezinhlayiya zikasimende.
Ukulawula umswakama nokugcina amanzi
Ama-cellulose ether angathuthukisa kakhulu ukugcinwa kwamanzi ezintweni ezisekelwe kusimende. Ngenxa ye-hydrophilicity yayo eqinile, i-cellulose ether ingakha isisombululo esizinzile se-colloidal emanzini, esingabamba futhi sigcine umswakama. Lo mthamo wokubamba amanzi ubalulekile ekwehliseni imifantu ebangelwa ukulahleka kwamanzi ngokushesha kukhonkolo ngesikhathi sokufakwa kwamanzi ngokushesha. Ikakhulukazi ezindaweni ezomile noma izimo zokwakha ezishisa kakhulu, i-cellulose ether ingavimbela ngokuphumelelayo amanzi ukuba ahwamuke ngokushesha futhi aqinisekise ukuthi inani lamanzi ku-slurry kasimende lanele ukusekela ukusabela okuvamile kwe-hydration.
I-Rheology kanye nokuqina
Ama-cellulose ether angabuye athuthukise i-rheology yama-slurries kasimende. Ngemva kokwengeza i-cellulose ether, ukuhambisana kwe-cement slurry kuzokhula kakhulu. Lesi simo sibangelwa ikakhulukazi isakhiwo seketango elide elakhiwe ama-molecule e-cellulose ether emanzini. Le molekyuli ye-long-chain ingakhawulela ukunyakaza kwezinhlayiya zikasimende, ngaleyo ndlela ikhulise i-viscosity kanye nokuvumelana kwe-slurry. Lesi sakhiwo sibaluleke kakhulu ekusetshenzisweni okufana nokunamatheliswa kwamathayela namathayela, njengoba kuvimbela udaka lukasimende ukuthi lugeleze ngokushesha kakhulu kuyilapho lunikeza ukusebenza okungcono kakhulu kokwakha.
Libazisa i-hydration futhi ulungise isikhathi sokusetha
I-cellulose ether ingabambezela ukusabela kwe-hydration kasimende futhi yandise ukusetha kokuqala kanye nesikhathi sokugcina sokusetha sodaka lukasimende. Lo mphumela uvela ngenxa yokuthi ama-molecule e-cellulose ether adsorbed phezu kwezinhlayiya zikasimende, enza umgoqo ovimbela ukuthintana okuqondile phakathi kwamanzi nezinhlayiya zikasimende, ngaleyo ndlela kubambezela ukusabela kwe-hydration. Ngokubambezela isikhathi sokusetha, ama-cellulose ether angathuthukisa ukusebenza komsebenzi wokwakha, anikeze izisebenzi zokwakha isikhathi esengeziwe sokwenza ukulungisa nokulungisa.
3. Umphumela ohlotsheni lwemikhiqizo ye-cement hydration
Ukuba khona kwe-cellulose ethers nakho kuthinta i-microstructure yemikhiqizo ye-cement hydration. Ucwaningo luye lwabonisa ukuthi i-morphology ye-calcium silicate hydrate (CSH) gel izoshintsha ngemva kokwengeza i-cellulose ether. Ama-molecule e-cellulose ether angase athinte ukwakheka kwekristalu ye-CSH, ayenze ixege. Lesi sakhiwo esixegayo singanciphisa amandla okuqala ngokwezinga elithile, kodwa futhi sisiza ukuthuthukisa ukuqina kwento.
I-Cellulose ethers inganciphisa ukwakheka kwe-ettringite phakathi nenqubo ye-hydration. Njengoba i-cellulose ether ibuyisela izinga lokusabela kwe-hydration, izinga lokubunjwa kwe-ettringite kusimende liyancishiswa, ngaleyo ndlela kuncishiswe ukucindezeleka kwangaphakathi okubangelwa ukwanda kwevolumu phakathi nenqubo yokwelapha.
4. Umthelela ekuthuthukisweni kwamandla
Ama-cellulose ether nawo anomthelela omkhulu ekuthuthukisweni kwamandla ezinto ezisekelwe kusimende. Ngenxa yokuthi ama-cellulose ethers abambezela izinga lokugeleza kukasimende, ukuthuthukiswa kwamandla okuqala kokunamathisela usimende ngokuvamile kuhamba kancane. Kodwa-ke, njengoba ukusabela kwe-hydration kuqhubeka, umphumela olawulayo wokugcinwa kwamanzi we-cellulose ether kanye ne-hydration product morphology ingavela kancane kancane, okuzosiza ukuthuthukisa amandla esigabeni sakamuva.
Kufanele kuqashelwe ukuthi inani elingeziwe kanye nohlobo lwe-cellulose ether lunomthelela okabili emandleni. Inani elifanele le-cellulose ether lingathuthukisa ukusebenza komsebenzi wokwakha futhi likhulise amandla kamuva, kodwa ukusetshenziswa ngokweqile kungase kuholele ekwehleni kwamandla okuqala ezinto ezisekelwe kusimende futhi kuthinte izakhiwo zokugcina zemishini. Ngakho-ke, ekusetshenzisweni okungokoqobo, uhlobo nesikali se-cellulose ether kudingeka sithuthukiswe futhi siklanywe ngokuya ngezidingo ezithile zobunjiniyela.
I-Cellulose ether ithinta inqubo ye-hydration kanye nezakhiwo ezibonakalayo zikasimende ngokuthuthukisa ukugcinwa kwamanzi kwezinto ezisekelwe kusimende, ukulungisa izinga lokugeleza kwamanzi, futhi kuthinte uhlobo lwemikhiqizo ye-hydration. Nakuba ama-cellulose ethers angase abangele ukulahlekelwa amandla okuqala, angathuthukisa ukuqina nokuqina kukakhonkolo esikhathini eside. Ukwengezwa kwe-cellulose ether nakho kungathuthukisa kakhulu ukusebenza kokwakhiwa, ikakhulukazi ezimweni zohlelo ezidinga izikhathi ezinde zokusebenza kanye nezidingo eziphezulu zokugcina amanzi. Inezinzuzo ezingenakubuyiselwa. Kuzinhlelo zokusebenza zangempela zobunjiniyela, ukukhetha okunengqondo kohlobo nesikali se-cellulose ether kungalinganisa amandla, ukusebenza kokwakhiwa kanye nezidingo zokuqina kwento.
Isikhathi sokuthumela: Sep-27-2024