Eter cellulosedheerayn doonaa waqtiga dejinta ee koollada sibidhka ama shabagga hoobiye, dib u dhigi kinetics fuuq cement ah, taas oo faa'iido leh si loo hagaajiyo waqtiga operative ee wax saldhigga cement, hagaajinaysaa joogtaynta iyo slump la taaban karo ka dib khasaaraha, laakiin sidoo kale dib u dhigi kartaa horumarka dhismaha, gaar ahaan xaaladaha heerkulka hoose ee isticmaalka hoobiye iyo shubka.
Guud ahaan, mar kasta oo ay sare u kacdo waxa ku jira ether-ka cellulose, waa sii dheeraadaa wakhtiga dejinta sibidhka iyo hoobiye, iyo waxa aad u muuqda dhaqdhaqaaqa fuuq-celinta ee dib u dhaca. Ether Cellulose waxay dib u dhigi kartaa fuuq-celinta wejiyada macdanta ugu muhiimsan ee clinker tricalcium aluminate (C3A) iyo tricalcium silicate (C3S) ee sibidhka, laakiin saameynta kinetics-ka fuuq-celinta ay isku mid maaha. Cellulose ether waxay inta badan hoos u dhigtaa heerka falcelinta C3S ee marxaladda dardargelinta, halka nidaamka C3A-Caso4, ay inta badan sii dheereyso muddada soo-saarka.
Tijaabooyin dheeraad ah ayaa muujiyay in ether cellulose ay joojin karto kala dirida C3A iyo C3S, dib u dhigista crystallization of calcium aluminate hydrated iyo calcium hydroxide, iyo in la yareeyo nukleation-ka iyo heerka koritaanka CSH ee dusha sare ee qaybaha C3S, laakiin wax yar saamayn on crystals ettringite. Weyer iyo al. waxaa la ogaaday in heerka beddelka DS uu ahaa qodobka ugu muhiimsan ee saameeya fuuq-baxa sibidhka, iyo DS-ka yari, waxa aad u cad cad fuuq-celinta sibidhka. On habka of cellulose ether dib u dhigi fuuq cement.
Sliva iyo al. Waxa la rumaysan yahay in ether-ka cellulose ay kordhisay viscosity ee xal dalool ah oo ay caqabad ku tahay heerka dhaqdhaqaaqa ion, sidaas darteed dib u dhigista fuuq-celinta sibidhka. Si kastaba ha ahaatee, Pourchez et al. waxa la ogaaday in xidhiidhka ka dhexeeya cellulose ether uu dib u dhigay fuuq-celinta sibidhka iyo viscosity slurry cement ma ahayn mid cad. Schmitz iyo al. la ogaaday in viscosity ee ether cellulose ku dhawaad wax saamayn ah kuma laha kinetics fuuqbaxa ee sibidhka.
Pourchez waxa kale oo ay ogaatay in ether-ka cellulose uu aad u deggan yahay xaaladaha alkaline-ka iyo fuuq-celinta sibidhka ee daahday aan loo nisbayn karin burburkaether cellulose. Adsorption waxay noqon kartaa sababta dhabta ah ee cellulose ether dib u dhigista fuuq-celinta sibidhka, waxyaabo badan oo lagu daro organic ayaa lagu dhejin doonaa qaybaha sibidhka iyo alaabta fuuqbaxa, ka hortagga kala dirida qaybaha sibidhka iyo crystallization ee alaabta fuuqbaxa, sidaas darteed dib u dhigista fuuq-celinta iyo uumiga sibidhka. Pourchcz iyo al. Waxaa la ogaaday in marka ay sii xoogeysato awoodda adsorption ee alaabta fuuq-celinta iyo ether cellulose, ay sii caddahay daahitaanka.
Waxaa guud ahaan la rumeysan yahay in unugyada ether-ka cellulose ay inta badan ku dhejiyaan alaabta fuuq-celinta oo ay dhif tahay in lagu dhajiyo wajiga asalka ah ee macdanta ee clinker.
Waqtiga boostada: Abriil-28-2024