Ma cellulose ethers ndi mtundu wa organic polymer mankhwala osinthidwa kuchokera ku cellulose wachilengedwe. Amagwiritsidwa ntchito kwambiri pomanga, makamaka pazida za simenti. Chikoka cha mapadi efa pa simenti hydration ndondomeko makamaka zimaonekera m'mbali zotsatirazi: ndi kubalalitsidwa kwa particles simenti, posungira madzi, thickening tingati, ndi chikoka pa morphology ndi mphamvu chitukuko cha mankhwala simenti hydration.
1. Chiyambi cha simenti hydration
Njira ya hydration ya simenti ndizovuta zingapo zomwe zimachitika pakati pa simenti ndi madzi. Zochita izi zimapangitsa kuti phala la simenti likhale lolimba pang'onopang'ono kuti likhale lolimba, ndipo pamapeto pake limapanga zinthu za hydration monga calcium silicate hydrate (CSH) ndi calcium hydroxide (CH). Panthawi imeneyi, hydration anachita mlingo wa simenti, ndi fluidity ndi madzi posungira slurry, ndi mapangidwe mankhwala hydration mwachindunji mphamvu ndi durability komaliza konkire.
2. Limagwirira ntchito ya cellulose ethers
Ma cellulose ether amatenga gawo lalikulu pakuwongolera kwakuthupi komanso kwamankhwala pakupanga simenti. Ma cellulose ether makamaka amakhudza njira ya hydration ya simenti m'njira ziwiri: imodzi ndikukhudza kugawa ndi kutuluka kwa madzi mu slurry ya simenti; china ndi kukhudza kubalalika ndi coagulation wa particles simenti.
Kuwongolera chinyezi ndi kusunga madzi
Ma cellulose ether amatha kusintha kwambiri kusungidwa kwa madzi kwa zinthu zopangidwa ndi simenti. Chifukwa cha hydrophilicity yake yolimba, cellulose ether imatha kupanga njira yokhazikika ya colloidal m'madzi, yomwe imatha kuyamwa ndikusunga chinyezi. Kusunga madzi kumeneku ndikofunikira pakuchepetsa ming'alu yomwe imayamba chifukwa cha kutayika kwamadzi mwachangu mu konkriti panthawi ya hydration yoyambirira. Makamaka m'malo owuma kapena kutentha kwambiri, ether ya cellulose imatha kuteteza madzi kuti asatuluke mwachangu ndikuwonetsetsa kuti kuchuluka kwa madzi mu slurry ya simenti ndikokwanira kuthandizira momwe ma hydration amachitira.
Rheology ndi Makulidwe
Ma cellulose ethers amathanso kusintha ma rheology a simenti. Pambuyo powonjezera cellulose ether, kugwirizana kwa simenti slurry kudzawonjezeka kwambiri. Izi makamaka zimachitika chifukwa cha unyolo wautali wopangidwa ndi ma cellulose ether mamolekyu m'madzi. Molekyu yautali iyi imatha kuletsa kusuntha kwa tinthu ta simenti, potero kumawonjezera kukhuthala komanso kusasinthika kwa slurry. Katunduyu ndi wofunika kwambiri pa ntchito monga pulasitala ndi zomatira matailosi, chifukwa zimalepheretsa matope a simenti kuyenda mwachangu pomwe akupereka ntchito yabwino yomanga.
Chepetsani hydration ndikusintha nthawi yokhazikitsa
Ma cellulose ether amatha kuchedwetsa kuyabwa kwa simenti ndikuwonjezera kukhazikitsa koyambirira komanso nthawi yomaliza ya slurry ya simenti. Izi zimachitika chifukwa mamolekyulu a cellulose ether amadsorbed pamwamba pa tinthu tating'ono ta simenti, ndikupanga chotchinga chomwe chimalepheretsa kukhudzana kwachindunji pakati pamadzi ndi tinthu tating'ono ta simenti, motero kumachepetsa zomwe zimachitika. Mwa kuchedwetsa nthawi yoikirapo, ma cellulose ether amatha kupititsa patsogolo ntchito yomanga, kupatsa ogwira ntchito yomanga nthawi yochulukirapo kuti asinthe ndi kukonza.
3. Mmene mawonekedwe a simenti hydration mankhwala
Kukhalapo kwa cellulose ether kumakhudzanso microstructure ya simenti hydration mankhwala. Kafukufuku wasonyeza kuti morphology ya kashiamu silicate hydrate (CSH) gel osakaniza adzasintha pambuyo kuwonjezera cellulose ether. Ma cellulose ether mamolekyu amatha kukhudza kapangidwe ka kristalo ka CSH, ndikupangitsa kuti ikhale yotayirira. Kapangidwe kotayirira kameneka kamatha kuchepetsa mphamvu zoyambilira pamlingo wina wake, koma kumathandizanso kukulitsa kulimba kwa zinthuzo.
Ma cellulose ethers amathanso kuchepetsa mapangidwe a ettringite panthawi ya hydration. Popeza cellulose ether imachepetsa kuchuluka kwa hydration reaction, kuchuluka kwa mapangidwe a ettringite mu simenti kumachepa, motero kumachepetsa kupsinjika kwamkati komwe kumachitika chifukwa chakukula kwa voliyumu panthawi yochiritsa.
4. Zotsatira pakukula kwa mphamvu
Ma cellulose ethers amathandizanso kwambiri pakukula kwamphamvu kwa zinthu zopangidwa ndi simenti. Chifukwa chakuti ma cellulose ethers amachepetsa kuthamanga kwa simenti, mphamvu yoyambilira ya phala la simenti nthawi zambiri imakhala yochedwa. Komabe, pamene hydration anachita akupitiriza, ndi ulamuliro zotsatira za mapalulo etere madzi posungira ndi hydration mankhwala morphology akhoza pang'onopang'ono kutuluka, zomwe zingathandize kusintha mphamvu mu siteji yotsatira.
Tiyenera kuzindikira kuti kuchuluka kowonjezera ndi mtundu wa cellulose ether zimakhala ndi mphamvu ziwiri pa mphamvu. Kuchuluka koyenera kwa cellulose ether kumatha kupititsa patsogolo ntchito yomanga ndikuwonjezera mphamvu pambuyo pake, koma kugwiritsa ntchito mopitilira muyeso kungayambitse kuchepa kwa mphamvu zoyambira za simenti komanso kukhudza mawonekedwe omaliza amakina. Chifukwa chake, muzogwiritsa ntchito, mtundu ndi mlingo wa cellulose ether uyenera kukonzedwa ndikupangidwa molingana ndi zofunikira zaukadaulo.
Ma cellulose ether amakhudza njira ya hydration ndi zinthu zakuthupi za simenti mwa kukonza kusungirako madzi pazinthu zopangira simenti, kusintha kuchuluka kwa hydration, komanso kukhudza mawonekedwe azinthu zamagetsi. Ngakhale ma cellulose ether angayambitse kutaya mphamvu koyambirira, amatha kupititsa patsogolo kulimba komanso kulimba kwa konkriti pakapita nthawi. Kuwonjezera kwa cellulose ether kungathandizenso kwambiri ntchito yomanga, makamaka pazochitika zogwiritsira ntchito zomwe zimafuna nthawi yayitali yogwira ntchito komanso zofunikira zosungira madzi. Lili ndi ubwino wosasinthika. Mu ntchito zenizeni zaumisiri, kusankha koyenera kwa mtundu ndi mlingo wa cellulose ether kumatha kulinganiza mphamvu, ntchito yomanga komanso kukhazikika kwazinthuzo.
Nthawi yotumiza: Sep-27-2024