Chikoka cha zinthu monga kusintha kwa viscosity kwa hydroxyethyl methylcellulose (HEMC), kaya kusinthidwa kapena ayi, ndipo zomwe zili mu kusintha kwa kupsinjika kwa zokolola ndi kukhuthala kwa pulasitiki kwa matope atsopano a simenti kunaphunziridwa.Kwa HEMC yosasinthika, kukwezeka kwamphamvu kwambiri, kumachepetsa kupsinjika kwa zokolola ndi ma viscosity apulasitiki amatope;chikoka cha mamasukidwe akayendedwe kusintha kwa kusinthidwa HEMC pa rheological katundu matope ndi wofooka;Ziribe kanthu kaya zasinthidwa kapena ayi, kukwezeka kwamakasitomala a HEMC, kutsika kwapang'onopang'ono Kuchepetsa kupsinjika kwa zokolola ndi pulasitiki kukhuthala kwa matope kumawonekera kwambiri.Pamene zomwe zili mu HEMC zimakhala zazikulu kuposa 0.3%, kupsinjika kwa zokolola ndi kukhuthala kwa pulasitiki kwa matope kumawonjezeka ndi kuwonjezeka kwa zomwe zili;pamene zomwe zili mu HEMC zimakhala zazikulu, kupsinjika kwa zokolola za matope kumachepa ndi nthawi, ndipo kuchuluka kwa pulasitiki kukhuthala kumawonjezeka ndi nthawi.
Mawu ofunikira: hydroxyethyl methylcellulose, matope atsopano, katundu wa rheological, kupsinjika kwa zokolola, kukhuthala kwa pulasitiki
I. Chiyambi
Ndi chitukuko chaukadaulo womanga matope, chidwi chochulukirapo chaperekedwa pakumanga kwamakina.Mayendedwe oyimirira mtunda wautali amaika patsogolo zofunika zatsopano pamatope opopera: madzi abwino ayenera kusamalidwa panthawi yonseyi.Izi zimafunika kuphunzira zomwe zimayambitsa komanso zoletsa za matope amadzimadzi, ndipo njira yodziwika bwino ndiyowona magawo a rheological a matope.
The rheological zimatha matope makamaka zimadalira chikhalidwe ndi kuchuluka kwa zipangizo.Ma cellulose ether ndi osakaniza omwe amagwiritsidwa ntchito kwambiri mumatope a mafakitale, omwe amakhudza kwambiri mphamvu ya matope a matope, kotero akatswiri kunyumba ndi kunja achita kafukufuku pa izo.Mwachidule, mfundo zotsatirazi zikhoza kuganiziridwa: kuwonjezeka kwa kuchuluka kwa cellulose ether kudzatsogolera kuwonjezeka kwa torque yoyamba ya matope, koma pakapita nthawi yogwedeza, kukana kwamatope kudzachepa m'malo mwake (1) ;pamene fluidity koyamba ali kwenikweni chimodzimodzi, fluidity wa matope adzatayika poyamba.kuchuluka pambuyo kuchepa (2);mphamvu zokolola ndi pulasitiki mamasukidwe akayendedwe matope matope anasonyeza mchitidwe kuchepa choyamba ndiyeno kuwonjezeka, ndi mapadi etero kulimbikitsa chiwonongeko cha matope dongosolo ndi kutalikitsa nthawi chiwonongeko kumangidwanso (3);Etere ndi wandiweyani ufa ali apamwamba mamasukidwe akayendedwe ndi bata etc. (4).Komabe, maphunziro omwe ali pamwambawa akadali ndi zolakwika:
Miyezo yoyezera ndi njira za akatswiri osiyanasiyana sizofanana, ndipo zotsatira za mayeso sizingafanane bwino;mtundu woyesera wa chidacho ndi wochepa, ndipo magawo a rheological a matope oyezera amakhala ndi kusiyana kochepa, komwe sikumayimilira kwambiri;pali kusowa kwa mayeso ofananiza pa ma cellulose ether okhala ndi ma viscosities osiyanasiyana;Pali zinthu zambiri zokopa, ndipo kubwereza sikuli bwino.M'zaka zaposachedwa, mawonekedwe a Viskomat XL matope rheometer apereka mwayi waukulu kuti adziwe molondola za rheological katundu wa matope.Ili ndi ubwino wa mlingo wapamwamba wolamulira, mphamvu zazikulu, mayesero osiyanasiyana, ndi zotsatira zoyesa zogwirizana ndi zochitika zenizeni.Papepalali, kutengera kugwiritsa ntchito chida chamtunduwu, zotsatira za kafukufuku wa akatswiri omwe alipo amapangidwa, ndipo pulogalamu yoyeserera imapangidwa kuti iphunzire momwe mitundu yosiyanasiyana ya ma viscosities a hydroxyethyl methylcellulose (HEMC) amagwirira ntchito pamatope mu matope. kuchuluka kwa mlingo.magwiridwe antchito.
2. Rheological chitsanzo cha matope atsopano a simenti
Popeza rheology idayambitsidwa mu sayansi ya simenti ndi konkriti, kafukufuku wambiri awonetsa kuti konkire yatsopano ndi dothi zitha kuwonedwa ngati madzi a Bingham, ndipo Banfill adafotokozanso kuthekera kogwiritsa ntchito chitsanzo cha Bingham pofotokoza zamatsenga amatope (5).Mu rheological equation τ=τ0+μγ ya chitsanzo cha Bingham, τ ndiye kumeta ubweya wa ubweya, τ0 ndi kupsyinjika kwa zokolola, μ ndi kukhuthala kwa pulasitiki, ndipo γ ndi kumeta ubweya.Pakati pawo, τ0 ndi μ ndizozigawo ziwiri zofunika kwambiri: τ0 ndi kuchepetsa kumeta ubweya wambiri komwe kungapangitse matope a simenti kuyenda, ndipo pokhapokha τ> τ0 ikugwira ntchito pamatope, matope amatha kuyenda;μ imasonyeza kukana kwa viscous pamene matope akuyenda Kukula kwa μ, pang'onopang'ono matope akuyenda [3].Ngati onse τ0 ndi μ sakudziwika, kumeta ubweya wa ubweya kuyenera kuyesedwa osachepera miyeso iwiri yosiyana ya kumeta ubweya isanawerengedwe (6).
Mu rheometer yamatope yomwe inapatsidwa, mphuno ya NT yomwe imapezeka poika mlingo wa kuzungulira kwa tsamba N ndikuyesa torque T yopangidwa ndi kukameta ubweya wa matope angagwiritsidwe ntchito kuwerengera chiwerengero china T = g + chomwe chikugwirizana ndi chitsanzo cha Bingham Magawo awiriwa. g ndi nh.g ndi molingana ndi kupsinjika kwa zokolola τ0, h imagwirizana ndi kukhuthala kwa pulasitiki μ, ndi τ0 = (K/G) g, μ = (l / G ) h, pomwe G imakhala yogwirizana ndi chida, ndipo K ikhoza kupyola mumayendedwe odziwika Amapezedwa mwa kukonza madzimadzi omwe mawonekedwe ake amasintha ndi kumeta ubweya[7].Kuti zikhale zosavuta, pepalali likufotokoza mwachindunji g ndi h, ndipo limagwiritsa ntchito lamulo losintha la g ndi h kusonyeza kusintha kwa lamulo la kupsinjika kwa zokolola ndi kukhuthala kwa pulasitiki kwa matope.
3. Mayeso
3.1 Zopangira
3.2 mchenga
Mchenga wa Quartz: mchenga wowoneka bwino ndi 20-40 mesh, mchenga wapakati ndi 40-70 mesh, mchenga wabwino ndi 70-100 mesh, ndipo atatuwo amasakanizidwa mu chiyerekezo cha 2:2:1.
3.3 Ma cellulose ether
Hydroxyethyl methylcellulose HEMC20 (kukhuthala 20000 mPa s), HEMC25 (kukhuthala 25000 mPa s), HEMC40 (kukhuthala 40000 mPa s), ndi HEMC45 (makamakamakamakamaka 45000 mPa s), amene HEMC525 modified ndi HEMC525 ma cell.
3.4 Kusakaniza madzi
madzi apampopi.
3.5 Dongosolo loyesa
Chiŵerengero cha laimu-mchenga ndi 1: 2.5, kumwa madzi kumakhazikika pa 60% ya simenti, ndipo zomwe zili mu HEMC ndi 0-1.2% ya simenti.
Choyamba sakanizani simenti yoyezedwa bwino, HEMC ndi mchenga wa quartz mofanana, kenaka yikani madzi osakaniza molingana ndi GB/T17671-1999 ndikuyambitsa, ndiyeno mugwiritseni ntchito Viskomat XL matope rheometer kuyesa.The mayeso ndondomeko ndi: liwiro mofulumira kuchuluka kwa 0 kuti 80rpm pa 0 ~ 5min, 60rpm pa 5 ~ 7min, 40rpm pa 7 ~ 9min, 20rpm pa 9 ~ 11min, 10rpm pa 11 ~ 13min, ndi 5rpm pa 13 ~ 15min , 15 ~ 30min, liwiro ndi 0rpm, ndiyeno kuzungulira kamodzi pa 30min malinga ndi ndondomeko pamwambapa, ndipo nthawi yonse yoyesa ndi 120min.
4. Zotsatira ndi zokambirana
4.1 Zotsatira za HEMC viscosity kusintha pa rheological properties za matope a simenti
(Kuchuluka kwa HEMC ndi 0.5% ya misa ya simenti), mofananamo kuwonetsera kusiyana kwa lamulo la kupsinjika kwa zokolola ndi kukhuthala kwa pulasitiki kwa matope.Zitha kuwoneka kuti ngakhale kukhuthala kwa HEMC40 ndikwapamwamba kuposa kwa HEMC20, kupsinjika kwa zokolola ndi kukhuthala kwa pulasitiki wamatope osakanikirana ndi HEMC40 ndi otsika kuposa amatope osakanikirana ndi HEMC20;ngakhale kukhuthala kwa HEMC45 ndi 80% kuposa HEMC25, kupsinjika kwa zokolola zamatope kumakhala kotsika pang'ono, ndipo kukhuthala kwa pulasitiki kuli pakati pa Pambuyo pa mphindi 90 panali kuwonjezeka.Izi zili choncho chifukwa kukwezeka kwa kukhuthala kwa cellulose ether kumachedwetsa kusungunuka, ndipo kumatenga nthawi yayitali kuti matope omwe amakonzedwa nawo afikire kukhuthala komaliza [8].Kuonjezera apo, panthawi yomweyi pakuyesedwa, kuchuluka kwa matope osakanikirana ndi HEMC40 kunali kochepa kusiyana ndi matope osakanikirana ndi HEMC20, ndipo matope osakanikirana ndi HEMC45 anali otsika kusiyana ndi matope osakanikirana ndi HEMC25, kusonyeza kuti HEMC40 ndi HEMC45 anabweretsa thovu zambiri mpweya, ndi thovu mpweya mu matope amakhala ""Mpira" zotsatira, amene amachepetsanso kukana matope kutuluka.
Pambuyo powonjezera HEMC40, kupsinjika kwa zokolola za matope kunali kofanana pambuyo pa mphindi 60, ndipo kukhuthala kwa pulasitiki kunakula;mutatha kuwonjezera HEMC20, kupsinjika kwa zokolola zamatope kunafika pamlingo pambuyo pa mphindi 30, ndipo kukhuthala kwa pulasitiki kunakula.Zimasonyeza kuti HEMC40 ili ndi zotsatira zochepetsetsa kwambiri pa chitukuko cha kupsinjika kwa zokolola zamatope ndi kukhuthala kwa pulasitiki kuposa HEMC20, ndipo zimatenga nthawi yaitali kuti zifike ku viscosity yomaliza.
Kupanikizika kwa zokolola za matope osakanikirana ndi HEMC45 kunatsika kuchokera ku 0 mpaka maminiti a 120, ndipo kukhuthala kwa pulasitiki kunakula pambuyo pa mphindi 90;pamene kupsinjika kwa zokolola za matope osakanikirana ndi HEMC25 kunawonjezeka pambuyo pa mphindi 90, ndipo kukhuthala kwa pulasitiki kunakula pambuyo pa mphindi 60.Zimasonyeza kuti HEMC45 ili ndi zotsatira zowonongeka kwambiri pa chitukuko cha kupsinjika kwa zokolola zamatope ndi kukhuthala kwa pulasitiki kuposa HEMC25, ndipo nthawi yofunikira kuti ifike ku viscosity yomaliza imakhalanso yaitali.
4.2 Zotsatira za HEMC zokhudzana ndi zokolola zamatope a simenti
Pakuyesa, zinthu zomwe zimakhudza kupsinjika kwa zokolola za matope ndi: matope a delamination ndi magazi, kuwonongeka kwa kapangidwe kake, kupanga zinthu za hydration, kuchepetsa chinyezi chaulere mumatope, ndikuchepetsa mphamvu ya cellulose ether.Pakuchepetsa mphamvu ya cellulose ether, lingaliro lovomerezeka kwambiri ndikulifotokozera mwa kutsatsa kwa zosakaniza.
Zitha kuwoneka kuti HEMC40 ikawonjezeredwa ndipo zomwe zili pansi pa 0.3%, kupsinjika kwa zokolola zamatope kumachepa pang'onopang'ono ndi kuwonjezeka kwa HEMC40;pamene zomwe zili mu HEMC40 ndizoposa 0.3%, kupanikizika kwamatope kumawonjezeka pang'onopang'ono.Chifukwa cha magazi ndi delamination matope popanda mapadi ether, palibe simenti phala yokwanira pakati pa aggregates kuti mafuta, chifukwa cha kuwonjezeka kwa zokolola nkhawa ndi kuvutika kuyenda.Kuwonjezera koyenera kwa cellulose ether kungathe kupititsa patsogolo chodabwitsa cha matope a delamination, ndipo mpweya wotulutsa mpweya umakhala wofanana ndi "mipira" yaying'ono, yomwe ingachepetse kupsinjika kwa zokolola zamatope ndikupangitsa kuti ikhale yosavuta kuyenda.Pamene zomwe zili mu cellulose ether zikuwonjezeka, chinyezi chake chokhazikika chimawonjezeka pang'onopang'ono.Pamene zomwe zili mu cellulose ether zimaposa mtengo wina, chikoka cha kuchepetsa chinyezi chaulere chimayamba kutsogolera, ndipo kupsinjika kwa zokolola zamatope kumawonjezeka pang'onopang'ono.
Pamene kuchuluka kwa HEMC40 ndi zosakwana 0.3%, kupsinjika kwa zokolola za matope kumachepa pang'onopang'ono mkati mwa 0-120min, zomwe zimagwirizana kwambiri ndi kuwonjezereka kwakukulu kwa matope, chifukwa pali mtunda wina pakati pa tsamba ndi pansi. chida, ndi akaphatikiza pambuyo delamination kumira pansi, kukana chapamwamba amakhala ang'onoang'ono;pamene HEMC40 zili ndi 0.3%, matope sadzatha delaminate, adsorption wa cellulose ether ndi zochepa, ndi hydration ndi lalikulu, ndipo zokolola kupsyinjika ali ndi kuwonjezeka kwina;Zomwe zili mu HEMC40 ndi Pamene zomwe zili mu cellulose ether ndi 0.5% -0.7%, kutsekemera kwa cellulose ether kumawonjezeka pang'onopang'ono, mlingo wa hydration umachepa, ndipo chitukuko cha zokolola zamatope chimayamba kusintha;Pamwamba, mlingo wa hydration ndi wotsika ndipo zokolola za matope zimachepa ndi nthawi.
4.3 Zotsatira za zomwe zili mu HEMC pa kukhuthala kwa pulasitiki kwa matope a simenti
Zitha kuwoneka kuti mutatha kuwonjezera HEMC40, kukhuthala kwa pulasitiki kwamatope kumawonjezeka pang'onopang'ono ndikuwonjezeka kwa HEMC40.Ichi ndi chifukwa mapadi efa ali thickening tingati kuonjezera mamasukidwe akayendedwe amadzimadzi, ndi waukulu mlingo, ndi kukulirakulira mamasukidwe akayendedwe a matope.Chifukwa chomwe kukhuthala kwa pulasitiki kwa matope kumachepa pambuyo powonjezera 0,1% HEMC40 ndi chifukwa cha "mpira" wa kuyambitsa thovu la mpweya, komanso kuchepa kwa magazi ndi kuchepa kwa matope.
The pulasitiki mamasukidwe akayendedwe matope wamba popanda kuwonjezera mapadi ether pang'onopang'ono amachepetsa ndi nthawi, amenenso zokhudzana m'munsi kachulukidwe kumtunda chifukwa cha layering wa matope;pamene zomwe zili mu HEMC40 ndi 0.1% -0.5%, mawonekedwe amatope ndi ofanana, ndipo mawonekedwe amatope ndi ofanana pambuyo pa mphindi 30.Kukhuthala kwa pulasitiki sikusintha kwambiri.Panthawiyi, makamaka amawonetsa kukhuthala kwa cellulose ether yokha;pambuyo zili HEMC40 ndi wamkulu kuposa 0,7%, pulasitiki mamasukidwe akayendedwe a matope kumawonjezera pang'onopang'ono ndi kuwonjezeka kwa nthawi, chifukwa mamasukidwe akayendedwe a matope ndi okhudzana ndi za mapalo ether.Kukhuthala kwa ma cellulose ether solution kumawonjezeka pang'onopang'ono pakapita nthawi mutangoyamba kusakaniza.Kuchuluka kwa mlingo, kumapangitsanso kufunikira kwa kuchuluka kwa nthawi.
V. Mapeto
Zinthu monga kusintha kwa viscosity kwa HEMC, kaya kusinthidwa kapena ayi, ndipo kusintha kwa mlingo kudzakhudza kwambiri rheological properties za matope, zomwe zingathe kuwonetsedwa ndi magawo awiri a kupsinjika kwa zokolola ndi kukhuthala kwa pulasitiki.
Kwa HEMC yosasinthika, kukhuthala kwakukulu, kumachepetsa kupsinjika kwa zokolola ndi kukhuthala kwa pulasitiki kwa matope mkati mwa 0-120min;chikoka cha kusintha mamasukidwe akayendedwe a kusinthidwa HEMC pa rheological katundu matope ndi wofooka kuposa HEMC unmodified;ziribe kanthu kusinthidwa Kaya ndi kosatha kapena ayi, kukulirakulira kwa viscosity ya HEMC, kofunika kwambiri kuchedwa kwa chitukuko cha kupsinjika kwa zokolola zamatope ndi kukhuthala kwa pulasitiki.
Powonjezera HEMC40 ndi viscosity ya 40000mPa · s ndipo zomwe zili ndi zazikulu kuposa 0.3%, kupsinjika kwa zokolola zamatope kumawonjezeka pang'onopang'ono;pamene zomwe zili pamwambazi zidutsa 0.9%, kupsinjika kwa zokolola zamatope kumayamba kusonyeza chizolowezi chochepa pang'onopang'ono ndi nthawi;Kukhuthala kwa pulasitiki kumawonjezeka ndikuwonjezeka kwa HEMC40.Pamene zomwe zili zazikulu kuposa 0.7%, kukhuthala kwa pulasitiki yamatope kumayamba kusonyeza chizolowezi chowonjezeka pang'onopang'ono ndi nthawi.
Nthawi yotumiza: Nov-24-2022