Ma cellulose ethers, makamaka hydroxypropylmethylcellulose (HPMC) ndi methylhydroxyethylcellulose (MHEC), akhala akugwiritsidwa ntchito kwambiri ngati zowonjezera za simenti pazomangamanga. Zomwe zimadziwika kuti zimasunga madzi, zidazi zimatha kupititsa patsogolo kugwirira ntchito, rheology ndi mphamvu zomangira za simenti. Komabe, mphamvu zawo pa simenti hydration sizidziwika nthawi zonse.
Cement hydration imatanthawuza momwe zimachitikira pakati pa madzi ndi zinthu zopangira simenti kuti apange zinthu za hydration monga calcium silicate hydrate (CSH) ndi calcium hydroxide (Ca (OH) 2). Izi ndizofunikira kwambiri pakukula kwa mphamvu zamakina a konkriti ndi kulimba.
Kuphatikizika kwa ma cellulose ether kuzinthu za simenti kumatha kukhala ndi zotsatira zabwino komanso zoyipa pamayendedwe a hydration. Kumbali imodzi, ntchito yosungiramo madzi ya cellulose ether imatha kulimbikitsa simenti kuti ipeze madzi kuti achite, potero kumawonjezera liwiro komanso kuchuluka kwa hydration. Izi zifupikitsa nthawi yokhazikitsa, imathandizira kukula kwa mphamvu ndikuwongolera zonse za konkire.
Ma cellulose ether amathanso kukhala ngati colloid zoteteza kuteteza kuphatikizika ndi kukhazikika kwa tinthu ta simenti. Izi zimabweretsa yunifolomu komanso yokhazikika ya microstructure, yomwe imapangitsanso makina komanso olimba a konkire.
Kumbali inayi, kugwiritsa ntchito kwambiri ma cellulose ethers kumatha kusokoneza hydration ya simenti. Chifukwa cellulose ether ndi pang'ono hydrophobic, amatchinga kulowa kwa madzi mu gelling zinthu, kuchititsa kuchedwa kapena kusakwanira hydration. Izi zimabweretsa kuchepa kwa mphamvu ndi kulimba kwa konkire.
Ngati ndende ya cellulose ether ndiyokwera kwambiri, imatenga danga mu slurry ya simenti yomwe iyenera kudzazidwa ndi tinthu tating'ono ta simenti. Chifukwa, okwana zolimba zili slurry adzachepa, chifukwa yafupika mawotchi katundu. Ma cellulose ethers owonjezera amathanso kukhala ngati chotchinga, kuteteza kuyanjana pakati pa tinthu ta simenti ndi madzi, ndikuchepetsanso njira ya hydration.
Ndikofunikira kudziwa kuchuluka koyenera kwa cellulose ether kuti mugwiritse ntchito kukonza zinthu zomwe zili ndi gelled ndikupewa kuwononga mphamvu ya hydration. Kuchulukaku kumadalira zinthu zambiri, monga mtundu wa cellulose ether, kapangidwe ka simenti, chiŵerengero cha simenti yamadzi ndi machiritso.
Ma cellulose ethers, makamaka HPMC ndi MHEC, amatha kukhala ndi zotsatira zabwino pa simenti ya simenti, malingana ndi momwe amachitira komanso momwe amapangira zinthu za simenti. Kuchuluka kwa cellulose ether yomwe imagwiritsidwa ntchito kuyenera kuganiziridwa mosamala kuti ikwaniritse zomwe mukufuna popanda kusokoneza zinthu za konkriti. Pogwiritsa ntchito bwino komanso kukhathamiritsa, ma cellulose ethers amatha kuthandizira pakupanga zida zomangira zolimba, zokhalitsa komanso zokhazikika.
Nthawi yotumiza: Aug-23-2023