Kodi cellulose ether imagwiritsidwa ntchito chiyani?

Cellulose etheradzatalikitsa nthawi yoika simenti phala kapena matope ukonde, kuchedwetsa simenti hydration kinetics, amene n'kopindulitsa kusintha nthawi operative wa zinthu m'munsi simenti, kusintha kugwirizana ndi kugwa konkire pambuyo kutayika, komanso akhoza kuchedwetsa ntchito yomanga, makamaka kutentha otsika mikhalidwe chilengedwe ntchito matope ndi konkire.

Nthawi zambiri, kuchuluka kwa cellulose ether kumapangitsanso nthawi yotalikirapo ya matope a simenti ndi matope, ndipo m'pamenenso zimawonekera kwambiri kuchedwa kwa hydration. Ma cellulose ether amatha kuchedwetsa ma hydration a magawo ofunikira kwambiri amchere amchere a tricalcium aluminate (C3A) ndi tricalcium silicate (C3S) mu simenti, koma zotsatira za hydration kinetics zawo sizofanana. Cellulose ether makamaka amachepetsa zomwe C3S anachita mu gawo mathamangitsidwe, pamene C3A-Caso4 dongosolo, makamaka kutalikitsa nthawi kupatsidwa ulemu.

Kuyesera kwina kunasonyeza kuti cellulose ether ikhoza kulepheretsa kusungunuka kwa C3A ndi C3S, kuchedwa kusungunuka kwa hydrated calcium aluminate ndi calcium hydroxide, ndi kuchepetsa nucleation ndi kukula kwa CSH pamtunda wa C3S particles, koma zinali ndi zotsatira zochepa pa makhiristo a ettringite. Weyer ndi al. anapeza kuti mlingo wa DS m'malo ndiye chinthu chachikulu chomwe chimakhudza kusungunuka kwa simenti, ndipo DS yaying'ono inali, zoonekeratu kwambiri kuti kuchedwa kwa simenti kunali. Pa limagwirira wa mapadi etere kuchedwa simenti hydration.

Sliva et al. amakhulupirira kuti cellulose ether imachulukitsa kukhuthala kwa pore solution ndikulepheretsa kuyenda kwa ayoni, motero kuchedwa kuchedwetsa simenti. Komabe, Pourchez et al. anapeza kuti ubale pakati pa cellulose ether kuchedwa simenti hydration ndi simenti slurry mamasukidwe akayendedwe sanali zoonekeratu. Schmitz ndi al. anapeza kuti mamasukidwe akayendedwe a mapadi ether anali pafupifupi alibe mphamvu pa hydration kinetics wa simenti.

Pourchez adapezanso kuti cellulose ether inali yokhazikika pansi pamikhalidwe yamchere ndipo kuchedwa kwake kwa simenti sikungakhale chifukwa cha kuwonongeka kwacellulose ether. Adsorption angakhale chifukwa chenicheni mapadi etere akuchedwa simenti hydration, zina zambiri organic adzakhala adsorbed kuti particles simenti ndi mankhwala hydration, kupewa Kutha kwa particles simenti ndi crystallization wa mankhwala hydration, motero kuchedwa ndi hydration ndi condensation wa simenti. Pourch et al. anapeza kuti mphamvu adsorption adsorption mankhwala hydration ndi mapadi ether, ndi moonekeratu kuchedwa.

Nthawi zambiri amakhulupirira kuti ma cellulose ether mamolekyu amatengeka kwambiri pazinthu za hydration ndipo samakonda kudsorbed pa gawo loyambirira la mchere la clinker.