Cellulose etherWaxay dheereyn doontaa waqtiga dejinta koollada sibidhka ama shabagga hoobiyaha, waxay dib u dhigi doontaa dhaqdhaqaaqa fuuq-celinta sibidhka, taas oo faa'iido u leh hagaajinta waqtiga hawlgalka ee walxaha salka sibidhka, waxay hagaajin doontaa isku-dhafka iyo hoos u dhaca sibidhka ka dib khasaaraha, laakiin sidoo kale waxay dib u dhigi kartaa horumarka dhismaha, gaar ahaan xaaladaha deegaanka heerkulka hooseeya ee isticmaalka hoobiyaha iyo sibidhka.
Guud ahaan, inta uu sarreeyo heerka sare ee cellulose ether, ayaa sii dheeraanaya waqtiga dejinta ee slurry iyo hoobiyaha sibidhka, iyo sidoo kale dhaqdhaqaaqa fuuq-celinta ee dib u dhaca. Cellulose ether waxay dib u dhigi kartaa fuuq-celinta marxaladaha macdanta clinker-ka ugu muhiimsan tricalcium aluminate (C3A) iyo tricalcium silicate (C3S) ee sibidhka, laakiin saameynta ku leh kinetics-kooda fuuq-celinta isku mid ma aha. Cellulose ether waxay inta badan yareysaa heerka falcelinta ee C3S marxaladda dardargelinta, halka nidaamka C3A-Caso4, uu inta badan dheereynayo muddada soo-kicinta.
Tijaabooyin dheeraad ah ayaa muujiyay in cellulose ether uu joojin karo kala dirista C3A iyo C3S, dib u dhigi karo crystallization-ka calcium aluminate-ka biyaha ku jira iyo calcium hydroxide, iyo inuu yareeyo heerka nucleation-ka iyo koritaanka CSH ee dusha sare ee walxaha C3S, laakiin saameyn yar ayuu ku yeeshay kiristaallada ettringite. Weyer et al. waxay ogaadeen in heerka beddelka DS uu ahaa qodobka ugu weyn ee saameeya fuuq-celinta sibidhka, iyo DS-ka yar, ayaa sii cad in fuuq-celinta sibidhka dib loo dhigay. Habka dib u dhigista fuuq-celinta sibidhka ee cellulose ether.
Sliva et al. waxay aaminsanaayeen in cellulose ether ay kordhisay daxalka xalka daloolada oo ay hor istaagtay heerka dhaqdhaqaaqa ion-ka, taasoo dib u dhigtay fuuq-celinta sibidhka. Si kastaba ha ahaatee, Pourchez et al. waxay ogaadeen in xiriirka ka dhexeeya fuuq-celinta sibidhka ee cellulose ether iyo daxalka sibidhka ee slurry uusan ahayn mid cad. Schmitz et al. waxay ogaadeen in daxalka sibidhka ee cellulose ether uusan wax saameyn ah ku lahayn kinetics fuuq-celinta sibidhka.
Pourchez wuxuu sidoo kale ogaaday in cellulose ether uu aad u deggan yahay xaaladaha alkaline-ka, fuuq-celinta sibidhkana aan loo aanayn karin kala-goysyadacellulose ether. Adkeysiga ayaa laga yaabaa inuu yahay sababta dhabta ah ee cellulose ether ay dib ugu dhigto fuuq-celinta sibidhka, waxyaabo badan oo dabiici ah ayaa lagu nuugi doonaa walxaha sibidhka iyo alaabada fuuq-celinta, taasoo ka hortagaysa kala dirista walxaha sibidhka iyo crystallization-ka alaabada fuuq-celinta, sidaas darteedna dib u dhigaysa fuuq-celinta iyo u nuugista sibidhka. Pourchcz et al. waxay ogaadeen in awoodda nuugista ee alaabada fuuq-celinta iyo cellulose ether oo xooggan ay sii caddahay dib u dhaca.
Guud ahaan waxaa la aaminsan yahay in molecules-ka ether-ka cellulose ay inta badan ku nuugaan waxyaabaha fuuq-baxa oo si dhif ah loogu nuugo marxaladda macdanta asalka ah ee clinker-ka.
Waqtiga boostada: Abriil-28-2024