Selulosi ether ndi mtundu wa organic polima pawiri ntchito kwambiri mu zomangira, makamaka mu zipangizo simenti. Ma cellulose ether amatha kuchedwetsa njira ya hydration ya simenti, potero kusintha magwiridwe antchito, kukhazikitsa nthawi komanso kukula kwamphamvu kwa phala la simenti.
(1). Kuchedwa hydration reaction
Ma cellulose ether amatha kuchedwetsa hydration reaction ya simenti, yomwe imapezeka makamaka kudzera munjira izi:
1.1 Adsorption ndi zoteteza
The mkulu mamasukidwe akayendedwe njira yopangidwa ndi Kusungunuka mapadi etere mu amadzimadzi njira akhoza kupanga adsorption filimu padziko particles simenti. Mapangidwe a filimuyi makamaka chifukwa cha kutengeka kwa thupi kwa magulu a hydroxyl mu cellulose ether mamolekyu ndi ayoni pamwamba pa tinthu tating'ono ta simenti, zomwe zimapangitsa kuti tinthu tating'ono ta simenti titetezedwe, kuchepetsa kukhudzana pakati pa tinthu tating'ono ta simenti ndi mamolekyu amadzi, potero. kuchedwetsa hydration reaction.
1.2 Kupanga mafilimu
Kumayambiriro kwa simenti hydration, cellulose ether amatha kupanga wandiweyani filimu pamwamba pa simenti particles. Kukhalapo kwa filimuyi kumalepheretsa kufalikira kwa mamolekyu amadzi mkati mwa tinthu tating'onoting'ono ta simenti, motero kumachepetsa kuchuluka kwa madzi a simenti. Kuphatikiza apo, mapangidwe a filimuyi amathanso kuchepetsa kusungunuka ndi kufalikira kwa ayoni a calcium, kuchedwetsanso mapangidwe a hydration.
1.3 Kusungunuka ndi kutulutsa madzi
Cellulose ether imakhala ndi mayamwidwe amphamvu amadzi, imatha kuyamwa chinyezi ndikumasula pang'onopang'ono. Njira yotulutsira madzi iyi imatha kusintha kuchuluka kwa madzi ndi kugwirira ntchito kwa simenti ya slurry kumlingo wina, ndikuchepetsa kuchuluka kwa hydration pochepetsa kuchuluka kwa madzi panthawi ya hydration.
(2). Mphamvu ya gawo la simenti
Ma cellulose ether ali ndi zotsatira zosiyana pa hydration ya magawo osiyanasiyana a simenti. Kawirikawiri, ether ya cellulose imakhala ndi zotsatira zoonekeratu pa hydration ya tricalcium silicate (C₃S). Kukhalapo kwa cellulose ether kudzachedwetsa hydration ya C₃S ndikuchepetsa kutulutsa kutentha koyambirira kwa C₃S, potero kuchedwetsa kukula kwamphamvu koyambirira. Kuonjezera apo, ma cellulose ethers amathanso kukhudza hydration ya zigawo zina zamchere monga dicalcium silicate (C₂S) ndi tricalcium aluminate (C₃A), koma zotsatirazi ndizochepa.
(3). Rheology ndi zotsatira zake
Selulosi ether akhoza kuonjezera mamasukidwe akayendedwe a simenti slurry ndi zimakhudza rheology ake. Mkulu mamasukidwe akayendedwe slurry kumathandiza kuchepetsa kukhazikika ndi stratification wa particles simenti, kulola simenti slurry kusunga yunifolomu wabwino asanakhazikike. Izi mkulu mamasukidwe akayendedwe khalidwe osati kuchedwa hydration ndondomeko simenti, komanso bwino fluidity ndi ntchito yomanga simenti slurry.
(4). Zotsatira zakugwiritsa ntchito ndi njira zodzitetezera
Ma cellulose ethers amakhala ndi mphamvu yayikulu pakuchedwetsa simenti ya simenti ndipo motero nthawi zambiri amagwiritsidwa ntchito kukonza nthawi yokhazikika komanso kuchuluka kwa zinthu zopangira simenti. Komabe, mlingo ndi mtundu wa efa wa cellulose uyenera kuyendetsedwa bwino, chifukwa kuchuluka kwa cellulose ether kungayambitse mavuto monga kusakwanira koyambirira komanso kuchepa kwa zinthu zopangira simenti. Kuonjezera apo, mitundu yosiyanasiyana ya ma cellulose ethers (monga methylcellulose, hydroxypropylmethylcellulose, etc.) ali ndi njira zosiyanasiyana ndi zotsatira mu slurries simenti, ndipo ayenera kusankhidwa malinga ndi zofunikira za ntchito.
Kugwiritsa ntchito mapadi a cellulose muzinthu zozikidwa pa simenti sikungangochedwetsa mayamwidwe a simenti, komanso kupititsa patsogolo ntchito yomanga ndi kukhazikika kwazinthuzo. Kupyolera mu kusankha koyenera ndi kugwiritsa ntchito ma cellulose ethers, ubwino ndi zomangamanga za zipangizo zopangira simenti zikhoza kusintha kwambiri.
Nthawi yotumiza: Aug-03-2024