Ma cellulose ether ndi mtundu wa mankhwala a organic polymer omwe amasinthidwa ndi mankhwala kuchokera ku cellulose yachilengedwe. Amagwiritsidwa ntchito kwambiri popanga zinthu zomangira, makamaka pazinthu zopangidwa ndi simenti. Mphamvu ya cellulose ether pa njira yothira madzi ya simenti imaonekera makamaka m'mbali izi: kufalikira kwa tinthu ta simenti, kusunga madzi, kukhuthala, komanso mphamvu ya kapangidwe ka zinthu zothira madzi za simenti.
1. Chiyambi cha madzi oundana a simenti
Njira yothira madzi ya simenti ndi mndandanda wa zochitika zovuta komanso zovuta pakati pa simenti ndi madzi. Zochitikazi zimapangitsa kuti phala la simenti likhale lolimba pang'onopang'ono kuti likhale lolimba, zomwe pamapeto pake zimapangitsa kuti zinthu zothira madzi monga calcium silicate hydrate (CSH) ndi calcium hydroxide (CH). Panthawiyi, kuchuluka kwa madzi a simenti, kusungunuka kwa madzi ndi kusunga madzi kwa slurry, komanso kupangika kwa zinthu zothira madzi zimakhudza mwachindunji mphamvu ndi kulimba kwa konkire yomaliza.
2. Kagwiridwe ka ntchito ka ethers a cellulose
Cellulose ether imagwira ntchito yofunika kwambiri pakulamulira kayendedwe ka madzi a simenti. Cellulose ether imakhudza kwambiri kayendedwe ka madzi a simenti m'njira ziwiri: imodzi imakhudza kufalikira ndi kusungunuka kwa madzi mu simenti; ina imakhudza kufalikira ndi kuuma kwa tinthu ta simenti.
Kulamulira chinyezi ndi kusunga madzi
Ma ether a cellulose amatha kusintha kwambiri kusunga madzi kwa zinthu zopangidwa ndi simenti. Chifukwa cha mphamvu yake yosinthasintha madzi, ether ya cellulose imatha kupanga yankho lokhazikika la colloidal m'madzi, lomwe limatha kuyamwa ndikusunga chinyezi. Mphamvu yosunga madzi iyi ndi yofunika kwambiri pochepetsa ming'alu yomwe imabwera chifukwa cha kutayika kwa madzi mwachangu mu konkriti panthawi yoyambira kunyowa. Makamaka m'malo ouma kapena m'malo otentha kwambiri omanga, ether ya cellulose imatha kuletsa madzi kuti asatuluke mwachangu kwambiri ndikuwonetsetsa kuti kuchuluka kwa madzi mu simenti ndikokwanira kuthandizira kayendedwe kabwino ka madzi.
Kuphunzira ndi Kukhuthala
Ma cellulose ether amathanso kusintha rheology ya simenti. Mukawonjezera cellulose ether, kusinthasintha kwa simenti slurry kudzawonjezeka kwambiri. Izi zimachitika makamaka chifukwa cha kapangidwe ka unyolo wautali wopangidwa ndi mamolekyu a cellulose ether m'madzi. Molekyulu yayitali iyi imatha kuletsa kuyenda kwa tinthu ta simenti, motero imawonjezera kukhuthala ndi kukhazikika kwa slurry. Katunduyu ndi wofunikira kwambiri pakugwiritsa ntchito monga plaster ndi zomatira za matailosi, chifukwa amaletsa simenti kuti isayende mwachangu kwambiri pamene ikupereka magwiridwe antchito abwino omanga.
Chepetsani madzi m'thupi ndipo sinthani nthawi yokhazikika
Cellulose ether imatha kuchedwetsa kuchuluka kwa madzi m'simenti ndikuwonjezera nthawi yoyambira komanso nthawi yomaliza yokhazikitsa simenti. Izi zimachitika chifukwa mamolekyu a cellulose ether amamatira pamwamba pa tinthu ta simenti, zomwe zimapangitsa kuti madzi asakhudze madzi mwachindunji, zomwe zimapangitsa kuti madzi asakhudze madzi. Mwa kuchedwetsa nthawi yokhazikitsa, ma cellulose ether amatha kusintha magwiridwe antchito omanga, ndikupatsa ogwira ntchito zomangamanga nthawi yochulukirapo kuti asinthe ndikusintha.
3. Zotsatira pa mawonekedwe a zinthu zothira madzi a simenti
Kupezeka kwa ma cellulose ether kumakhudzanso kapangidwe ka zinthu za simenti. Kafukufuku wasonyeza kuti mawonekedwe a calcium silicate hydrate (CSH) gel amasintha pambuyo powonjezera cellulose ether. Mamolekyu a cellulose ether angakhudze kapangidwe ka kristalo ka CSH, zomwe zimapangitsa kuti ikhale yomasuka kwambiri. Kapangidwe komasuka aka kangachepetse mphamvu yoyambirira mpaka pamlingo winawake, komanso kumathandizanso kukonza kulimba kwa zinthuzo.
Ma cellulose ether amathanso kuchepetsa kupangika kwa ettringite panthawi ya hydration. Popeza cellulose ether imachedwetsa kuchuluka kwa hydration reaction, kuchuluka kwa ettringite mu simenti kumachepa, motero kuchepetsa kupsinjika kwamkati komwe kumachitika chifukwa cha kukula kwa voliyumu panthawi ya processing.
4. Zotsatira pakukula kwa mphamvu
Ma cellulose ethers nawonso amakhudza kwambiri kukula kwa mphamvu ya zinthu zopangidwa ndi simenti. Chifukwa ma cellulose ethers amachedwetsa kuchuluka kwa madzi a simenti, kukula kwa mphamvu ya simenti nthawi zambiri kumakhala kocheperako. Komabe, pamene madzi akupitirira, mphamvu yolamulira ya cellulose ether yosungira madzi ndi mawonekedwe a madzi imatha kuonekera pang'onopang'ono, zomwe zingathandize kukweza mphamvu mtsogolo.
Tiyenera kudziwa kuti kuchuluka ndi mtundu wa cellulose ether zomwe zawonjezeredwa zimakhudza mphamvu kawiri. Kuchuluka koyenera kwa cellulose ether kumatha kusintha magwiridwe antchito omanga ndikuwonjezera mphamvu pambuyo pake, koma kugwiritsa ntchito mopitirira muyeso kungayambitse kuchepa kwa mphamvu yoyambirira ya zinthu zopangidwa ndi simenti ndikukhudza mawonekedwe omaliza a makina. Chifukwa chake, pakugwiritsa ntchito koyenera, mtundu ndi mlingo wa cellulose ether ziyenera kukonzedwa bwino ndikupangidwa malinga ndi zofunikira zinazake zaukadaulo.
Cellulose ether imakhudza njira yothira madzi ndi zinthu za simenti mwa kukonza kusunga madzi kwa zinthu zopangidwa ndi simenti, kusintha kuchuluka kwa madzi, ndikukhudza mawonekedwe a zinthu zothira madzi. Ngakhale kuti ma cellulose ether amatha kutayika mphamvu zoyambirira, amatha kukonza kulimba ndi kulimba kwa konkire pakapita nthawi. Kuwonjezera kwa cellulose ether kungathandizenso kwambiri magwiridwe antchito omanga, makamaka pazochitika zomwe zimafuna nthawi yayitali yogwira ntchito komanso zofunikira kwambiri zosungira madzi. Ili ndi zabwino zosasinthika. Mu ntchito zenizeni zaukadaulo, kusankha koyenera kwa mtundu ndi mlingo wa cellulose ether kumatha kulinganiza mphamvu, magwiridwe antchito omanga ndi kulimba kwa zinthuzo.
Nthawi yotumizira: Sep-27-2024