Cellulose ether idzachedwetsa kusungunuka kwa simenti ku madigiri osiyanasiyana, omwe amawonekera pochedwa kupanga ettringite, gel CSH ndi calcium hydroxide.Pakalipano, makina a cellulose ether akuchedwetsa simenti hydration makamaka kumaphatikizapo kulingalira kwa kulepheretsa ion kayendedwe, kuwonongeka kwa alkali ndi kutsekemera.
1. Kuyerekeza kwa kayendedwe ka ayoni kolepheretsa
Zimaganiziridwa kuti ma cellulose ethers amawonjezera kukhuthala kwa pore yankho, kulepheretsa kusuntha kwa ayoni, potero kuchedwetsa simenti.Komabe, pakuyesa uku, ether ya cellulose yokhala ndi mamasukidwe otsika imakhala ndi mphamvu yochepetsera simenti ya simenti, kotero lingaliro ili siligwira.Ndipotu, nthawi ya kayendedwe ka ion kapena kusamuka ndi yochepa kwambiri, zomwe mwachiwonekere sizingafanane ndi nthawi ya kuchedwa kwa simenti ya hydration.
2. Kuwonongeka kwa zamchere
Ma polysaccharides nthawi zambiri amawonongeka mosavuta pansi pamikhalidwe yamchere kuti apange ma hydroxycarboxylic acid omwe amachedwetsa kusungunuka kwa simenti.Choncho, chifukwa mapadi etere akuchedwetsa simenti hydration kungakhale kuti amawononga mu zamchere simenti slurry kupanga hydroxycarboxylic zidulo, koma kafukufuku anapeza kuti Cellulose efa ndi khola kwambiri pansi pa zinthu zamchere, pang'ono chabe otsika, ndi mankhwala wonyozeka pafupifupi palibe zotsatira. pa kuchedwa kwa simenti hydration.
3. Adsorption
Adsorption ikhoza kukhala chifukwa chenicheni chomwe cellulose ether imachedwetsa hydration ya simenti.Zowonjezera zambiri zama organic zitha kukopa tinthu tating'ono ta simenti ndi zinthu za hydration, kupewa kusungunuka kwa tinthu tating'ono ta simenti ndi crystallization ya zinthu za hydration, potero kuchedwetsa hydration ndi kukhazikitsa kwa simenti.Zinapezeka kuti cellulose ether imatengedwa mosavuta ku calcium hydroxide, C. S.Pamwamba pa zinthu za hydration monga H gel ndi calcium aluminate hydrate, koma sikophweka kuti adsorbed ndi ettringite ndi unhydrated gawo.Komanso, ponena za ether ya cellulose, mphamvu ya adsorption ya HEC ndi yamphamvu kuposa ya MC, ndipo kutsika kwa hydroxyethyl mu HEC kapena hydroxypropyl mu HPMC, mphamvu ya adsorption yamphamvu ndi: ponena za mankhwala a hydration, hydrogen. Kuchuluka kwa adsorption ya calcium oxide C. S.Kuthekera kwa ma adsorption a H ndikolimba.Kusanthula kwina kumasonyezanso kuti mphamvu ya adsorption ya mankhwala a hydration ndi cellulose ether ali ndi chiyanjano chofanana ndi kuchedwa kwa simenti hydration: mphamvu ya adsorption, ndi yoonekeratu kuchedwa, koma kutsekemera kwa ettringite ku cellulose ether ndikofooka, koma mapangidwe ake. idachedwa kwambiri.Kafukufuku wasonyezanso kuti cellulose ether ali ndi adsorption amphamvu pa tricalcium silicate ndi mankhwala ake hydration, motero kwambiri kuchedwetsa hydration wa silicate gawo, ndipo ali otsika adsorption kuti ettringite, koma mapangidwe ettringite ndi zoletsedwa.Mwachiwonekere kuchedwa, izi ndi chifukwa chakuti kuchedwa kupangidwa kwa ettringite kumakhudzidwa ndi Ca2 + balance mu yankho, lomwe ndilo kupitiriza kwa kuchedwa kwa silicate hydration ya cellulose ether.
M'zotsatira za mayeso, mphamvu yochepetsetsa ya HEC ndi yamphamvu kuposa ya MC, ndipo mphamvu ya cellulose ether kuchedwetsa mapangidwe a calcium hydroxide ndi yamphamvu kuposa ya C. S.Kutha kwa gel osakaniza ndi ettringite ndi kolimba, komwe kuli ndi ubale wofananira ndi mphamvu ya adsorption ya cellulose ether ndi zinthu za simenti za hydration.Zimatsimikiziridwanso kuti adsorption ikhoza kukhala chifukwa chenicheni chomwe cellulose ether imachedwetsa simenti hydration, ndipo cellulose ether ndi simenti hydration mankhwala ali ndi chiyanjano chofanana.Amphamvu adsorption mphamvu ya mankhwala simenti hydration, n'zoonekeratu kwambiri mapangidwe anachedwa hydration mankhwala.Zotsatira zoyesa zam'mbuyo zikuwonetsa kuti ma cellulose ethers osiyanasiyana ali ndi zotsatira zosiyana pa kuchedwa kwa simenti ya Portland, ndipo cellulose ether yomweyi imakhala ndi zotsatira zosiyana zochedwa pazinthu zosiyanasiyana za hydration, zomwe zimasonyeza kuti mankhwala a Portland simenti ali ndi zotsatira zosiyana pa fiber.Ma adsorption a cellulose ether amasankha, ndipo kutsatsa kwa cellulose ether kuzinthu za simenti za simenti kumasankhanso.
Nthawi yotumiza: Feb-27-2023