Kodi ether ya cellulose imagwiritsidwa ntchito chiyani?

Cellulose etherZimawonjezera nthawi yoyika simenti kapena ukonde wa simenti, zimachedwetsa kayendedwe ka madzi a simenti, zomwe zimathandiza kukonza nthawi yogwiritsira ntchito zinthu zoyambira simenti, kukonza kusinthasintha ndi kugwa kwa simenti pambuyo poti yatayika, komanso zingachedwetse kupita patsogolo kwa ntchito yomanga, makamaka m'malo otentha kwambiri kuti mugwiritse ntchito simenti ndi simenti.

Kawirikawiri, kuchuluka kwa ether ya cellulose kukakhala kwakukulu, nthawi yayitali yoyika simenti ndi matope imakhala yayitali, ndipo mphamvu ya hydration yochedwa imawonekera bwino. Cellulose ether imatha kuchedwetsa hydration ya magawo ofunikira kwambiri a clinker mineral tricalcium aluminate (C3A) ndi tricalcium silicate (C3S) mu simenti, koma zotsatira zake pa hydration kinetics sizofanana. Cellulose ether makamaka imachepetsa kuchuluka kwa reaction ya C3S mu acceleration phase, pomwe pa C3A-Caso4 system, makamaka imawonjezera nthawi yoyambira.

Kuyesera kwina kunawonetsa kuti cellulose ether ikhoza kuletsa kusungunuka kwa C3A ndi C3S, kuchedwetsa kupangika kwa calcium aluminate yosungunuka ndi calcium hydroxide, ndikuchepetsa nucleation ndi kukula kwa CSH pamwamba pa tinthu ta C3S, koma sizinakhudze kwambiri makristalo a ettringite. Weyer et al. adapeza kuti kuchuluka kwa DS m'malo mwake ndiye chinthu chachikulu chomwe chimakhudza hydration ya simenti, ndipo DS yaying'ono, kuchedwetsa kwa simenti kumakhala koonekeratu. Pa njira ya cellulose ether kuchedwetsa hydration ya simenti.

Sliva ndi anzake ankakhulupirira kuti cellulose ether imawonjezera kukhuthala kwa yankho la pore ndikulepheretsa kuyenda kwa ayoni, motero imachedwetsa kukhuthala kwa simenti. Komabe, Pourchez ndi anzake adapeza kuti ubale pakati pa cellulose ether ndi kukhathamiritsa kwa simenti ndi kukhuthala kwa simenti suli woonekeratu. Schmitz ndi anzake adapeza kuti kukhuthala kwa cellulose ether sikunakhudze kwambiri kayendedwe ka simenti.

Pourchez adapezanso kuti ether ya cellulose inali yokhazikika kwambiri pansi pa mikhalidwe ya alkaline ndipo kuchedwa kwa simenti yake sikunachitike chifukwa cha kuwonongeka kwaether ya celluloseKuthira madzi kungakhale chifukwa chenicheni chomwe chimachedwetsa kusungunuka kwa simenti ya cellulose ether, zowonjezera zambiri zachilengedwe zimathira madzi ku tinthu ta simenti ndi zinthu zothira madzi, zomwe zimaletsa kusungunuka kwa tinthu ta simenti ndi kupanga ma crystallization a zinthu zothira madzi, motero zimachedwetsa kusungunuka kwa madzi ndi kusungunuka kwa simenti. Pourchcz et al. adapeza kuti mphamvu yothira madzi ndi ether ya cellulose ikakula, kuchedwa kwake kumaonekera bwino.

Kawirikawiri amakhulupirira kuti mamolekyu a cellulose ether amamatiridwa makamaka ndi zinthu zothira madzi ndipo nthawi zambiri samamatiridwa pa gawo loyambirira la mchere wa clinker.