I-cellulose etherizokwandisa isikhathi sokumisa ukunamathisela usimende noma inetha lodaka, ibambezele i-siment hydration kinetics, okuzuzisa ukuthuthukisa isikhathi sokusebenza sezinto eziyisisekelo zikasimende, ukuthuthukisa ukungaguquguquki nokuwohloka kokhonkolo ngemva kokulahlekelwa, kodwa futhi kungase kubambezele inqubekelaphambili yokwakhiwa, ikakhulukazi ezimweni eziphansi zokushisa kwemvelo ukuze kusetshenziswe udaka nokhonkolo.
Ngokuvamile, ukuphakama kokuqukethwe kwe-cellulose ether, isikhathi sokusetha se-slurry nosimende siba side, futhi kuba sobala nakakhulu ukulibaziseka kwe-hydration dynamics. I-Cellulose ether ingabambezela ukugeleza kwezigaba zamaminerali ezibaluleke kakhulu ze-clinker tricalcium aluminate (C3A) ne-tricalcium silicate (C3S) kusimende, kodwa umphumela ku-hydration kinetics yazo awufani. I-Cellulose ether yehlisa izinga lokuphendula le-C3S esigabeni sokusheshisa, kuyilapho kusistimu ye-C3A-Caso4, yandisa kakhulu isikhathi sokungeniswa.
Ukuhlola okwengeziwe kubonise ukuthi i-cellulose ether ingavimbela ukuqedwa kwe-C3A ne-C3S, ibambezele ukukhishwa kwekristalu ye-hydrated calcium aluminate ne-calcium hydroxide, futhi yehlise izinga le-nucleation nokukhula kwe-CSH ebusweni bezinhlayiya ze-C3S, kodwa ibe nomthelela omncane kumakristalu e-ettringite. Weyer et al. ithole ukuthi i-degree of substitution DS yayiyisici esiyinhloko esithinta ukugeleza kukasimende, futhi i-DS encane kwaba, okusobala kakhulu ukuthi ukulibaziseka kukasimende kwaba. Kumshini we-cellulose ether ukubambezeleka kokufakwa kukasimende.
Sliva et al. babekholelwa ukuthi i-cellulose ether yandisa i-viscosity yesisombululo se-pore futhi ivimbela izinga lokunyakaza kwe-ion, ngaleyo ndlela ibambezele ukugeleza kukasimende. Nokho, uPourchez et al. ithole ukuthi ubudlelwano phakathi kwe-cellulose ether ukubambezeleka kokufakwa kukasimende kanye ne-viscosity ye-cement slurry kwakungabonakali. Schmitz et al. ithole ukuthi i-viscosity ye-cellulose ether cishe ayinawo umthelela ku-hydration kinetics kasimende.
I-Pourchez iphinde yathola ukuthi i-cellulose ether yayizinzile kakhulu ngaphansi kwezimo ze-alkaline futhi ukulibaziseka kwayo kukasimende hydration kwakungeke kubalulwe ukubola kwe-alkaline.i-cellulose ether. I-Adsorption ingase ibe isizathu sangempela se-cellulose ether ukubambezeleka kwe-cement hydration, izithasiselo eziningi eziphilayo zizokhangiswa ezinhlayiyeni zikasimende nemikhiqizo ye-hydration, kuvimbele ukuchithwa kwezinhlayiya zikasimende kanye ne-crystallization yemikhiqizo ye-hydration, ngaleyo ndlela ibambezele ukugeleza nokufiphala kukasimende. Pourchcz et al. ithole ukuthi lapho amandla okukhangisa emikhiqizo ye-hydration kanye ne-cellulose ether eqinile, kuba sobala kakhulu ukubambezeleka.
Ngokuvamile kunenkolelo yokuthi ama-molecule e-cellulose ether akhangiswa kakhulu emikhiqizweni ye-hydration futhi awavamile ukukhangisa esigabeni sokuqala samaminerali se-clinker.
Isikhathi sokuthumela: Apr-28-2024