Cellulose etherzai tsawaita lokacin saitin siminti manna ko turmi net, jinkirta da ciminti hydration kinetics, wanda yake da amfani don inganta aiki lokaci na ciminti tushe abu, inganta daidaito da kankare slump bayan asarar, amma kuma na iya jinkirta da gina ci gaban, musamman a cikin low zafin jiki yanayi yanayi don amfani da turmi da kankare.
Gabaɗaya, mafi girman abun ciki na ether cellulose, mafi tsayin lokacin saita siminti slurry da turmi, kuma mafi bayyananniyar jinkirin kuzarin kuzari. Cellulose ether na iya jinkirta hydration na mafi mahimmancin nau'ikan ma'adinai na clinker tricalcium aluminate (C3A) da tricalcium silicate (C3S) a cikin siminti, amma tasirin su na kinetics hydration ba iri ɗaya bane. Cellulose ether yafi rage yawan amsawar C3S a cikin hanzari, yayin da tsarin C3A-Caso4, yafi tsawaita lokacin shigarwa.
Ƙarin gwaje-gwajen sun nuna cewa ether cellulose zai iya hana rushewar C3A da C3S, jinkirta ƙaddamar da ƙwayar calcium aluminate hydrated da calcium hydroxide, da kuma rage ƙaddamarwa da girma na CSH a saman sassan C3S, amma yana da ɗan tasiri akan ettringite crystals. Weyer et al. gano cewa matakin maye gurbin DS shine babban abin da ke shafar ruwan siminti, kuma ƙarami DS shine, mafi ƙaranci jinkirin jinkirin siminti shine. A kan tsarin cellulose ether jinkirta ciminti hydration.
Sliva et al. yi imani da cewa ether cellulose ya kara danko na pore bayani da kuma hana adadin ion motsi, don haka jinkirta ciminti hydration. Koyaya, Pourchez et al. gano cewa dangantakar dake tsakanin cellulose ether jinkirta ciminti hydration da ciminti slurry danko ba a fili. Schmitz et al. gano cewa danko na cellulose ether kusan ba shi da wani tasiri a kan hydration kinetics na siminti.
Pourchez kuma ya gano cewa ether cellulose yana da ƙarfi sosai a ƙarƙashin yanayin alkaline kuma jinkirin jinkirin ciminti ba za a iya danganta shi da bazuwarcellulose ether. Adsorption na iya zama ainihin dalilin cellulose ether jinkirin ciminti hydration, da yawa kwayoyin addittu za a adsorbed zuwa siminti barbashi da hydration kayayyakin, hana rushewar siminti barbashi da crystallization na hydration kayayyakin, don haka jinkirta da hydration da condensation na siminti. Pourchcz et al. ya gano cewa ƙarfin ƙarfin tallan samfuran hydration da ether cellulose, mafi ƙarancin jinkiri.
An yi imani da cewa ƙwayoyin ether na cellulose suna daɗaɗawa akan samfuran hydration kuma da wuya a haɗa su akan ainihin ma'adinai na clinker.
Lokacin aikawa: Afrilu-28-2024