Cellulose ether pa matope a mchenga wa slag

Kugwiritsa ntchito P·II 52.5 kalasi simenti monga zinthu cementitious ndi zitsulo slag mchenga monga akaphatikiza chabwino, zitsulo slag mchenga ndi fluidity mkulu ndi mphamvu mkulu wakonzedwa ndi kuwonjezera zina mankhwala monga madzi reducer, latex ufa ndi defoamer Special matope, ndi zotsatira za awiri osiyana. viscosities (2000mPa·s ndi 6000mPa·s) ya hydroxypropyl methylcellulose ether (HPMC) pa kusungirako madzi, fluidity ndi mphamvu zinaphunziridwa. Zotsatira zikuwonetsa kuti: (1) Onse a HPMC2000 ndi HPMC6000 amatha kuonjezera kuchuluka kwa madzi osungiramo matope atsopano osakanikirana ndikupititsa patsogolo ntchito yake yosungira madzi; (2) Pamene zomwe zili mu cellulose ether ndizochepa, zotsatira za fluidity za matope sizidziwikiratu. Zikawonjezedwa mpaka 0,25% kapena kupitilira apo, zimakhala ndi vuto linalake pa fluidity ya matope, pomwe kuwonongeka kwa HPMC6000 kumakhala koonekeratu; (3) Kuwonjezera pa cellulose ether alibe zotsatira zoonekeratu pa 28-day compressive mphamvu ya matope, koma Kuwonjezera HPMC2000 Nthawi yosayenera, mwachionekere zoipa kwa flexural mphamvu ya mibadwo yosiyana, ndipo nthawi yomweyo amachepetsa kwambiri. oyambirira (masiku 3 ndi masiku 7) compressive mphamvu ya matope; (4) Kuwonjezera kwa HPMC6000 kumakhala ndi zotsatira zina pa mphamvu yosinthika ya mibadwo yosiyana , koma kuchepetsa kunali kochepa kwambiri kuposa HPMC2000. Mu pepalali, amaona kuti HPMC6000 ayenera kusankhidwa pokonzekera zitsulo slag mchenga wapadera matope ndi fluidity mkulu, mlingo mkulu posungira madzi ndi mphamvu mkulu, ndi mlingo sayenera kukhala wamkulu kuposa 0,20%.

Mawu ofunikira:mchenga wa slag wachitsulo; cellulose ether; mamasukidwe akayendedwe; magwiridwe antchito; mphamvu

mawu oyamba

Slag yachitsulo ndi chinthu chopangidwa ndi kupanga zitsulo. Ndi chitukuko cha mafakitale achitsulo ndi zitsulo, kutulutsa kwapachaka kwachitsulo cha slag kwawonjezeka ndi pafupifupi matani 100 miliyoni m'zaka zaposachedwa, ndipo vuto la kusungirako katundu chifukwa cha kulephera kwa kugwiritsidwa ntchito kwazinthu panthawi yake ndi lalikulu kwambiri. Choncho, kugwiritsa ntchito zipangizo ndi kutaya zitsulo zachitsulo pogwiritsa ntchito njira zasayansi ndi zothandiza ndi vuto lomwe silinganyalanyazidwe. Slag yachitsulo imakhala ndi mawonekedwe a kachulukidwe kwambiri, mawonekedwe olimba komanso mphamvu yopondereza, ndipo imatha kugwiritsidwa ntchito m'malo mwa mchenga wachilengedwe mumatope a simenti kapena konkriti. Steel slag imakhalanso ndi reactivity ina. Slag yachitsulo imasiyidwa kukhala ufa wina wa fineness (chitsulo slag ufa). Pambuyo kusakaniza konkire, imatha kukhala ndi pozzolanic, yomwe imathandiza kupititsa patsogolo mphamvu ya slurry ndikuwongolera kusintha kwa mawonekedwe pakati pa konkriti ndi slurry. dera, potero kuwonjezera mphamvu ya konkire. Komabe, ziyenera kukumbukiridwa kuti slag yachitsulo yomwe imatulutsidwa popanda miyeso, calcium oxide yaulere yamkati, magnesium oxide yaulere ndi RO gawo zidzapangitsa kuti chitsulocho chisasunthike bwino, chomwe chimalepheretsa kugwiritsa ntchito chitsulo ngati coarse komanso zabwino aggregates. Kugwiritsa ntchito mumatope a simenti kapena konkriti. Wang Yuji et al. mwachidule njira zosiyanasiyana zitsulo slag mankhwala ndipo anapeza kuti zitsulo slag ankachitira ndi otentha stuffing njira ali bata wabwino ndipo angathe kuthetsa vuto lake kukulitsa mu konkire simenti, ndi otentha kukayika mankhwala ndondomeko kwenikweni akuyendera Shanghai No. 3 Iron ndi Zitsulo Plant kwa nthawi yoyamba. Kuwonjezera pa vuto la bata, zitsulo za slag aggregates zimakhalanso ndi ma pores ovuta, ma angles ambiri, ndi mankhwala ochepa a hydration pamtunda. Akagwiritsidwa ntchito ngati zophatikizira kukonza matope ndi konkriti, magwiridwe antchito awo nthawi zambiri amakhudzidwa. Pakalipano, poyang'ana kuonetsetsa kukhazikika kwa voliyumu, kugwiritsa ntchito slag yachitsulo monga chophatikizira bwino kukonzekera matope apadera ndi njira yofunika kwambiri yogwiritsira ntchito zitsulo zachitsulo. Kafukufukuyu adapeza kuti kuwonjezera chochepetsera madzi, ufa wa latex, ether cellulose, air-entraining agent ndi defoamer ku matope a mchenga wa slag kumatha kupititsa patsogolo ntchito yosakaniza ndi kuuma kwa matope a mchenga wa slag ngati pakufunika. Mlembi wagwiritsa ntchito miyeso kuwonjezera latex ufa ndi zina admixtures kukonzekera zitsulo slag mchenga mkulu-mphamvu kukonza matope. Pakupanga ndi kugwiritsa ntchito matope, cellulose ether ndiye kuphatikiza kwamankhwala komwe kumafala kwambiri. Ma cellulose ether omwe amagwiritsidwa ntchito kwambiri mumatope ndi hydroxypropyl methyl cellulose ether (HPMC) ndi hydroxyethyl methyl cellulose ether (HEMC). ) Dikirani. Ma cellulose ether amatha kusintha magwiridwe antchito a matope pamlingo waukulu, monga kupatsa matope kuti asungire bwino madzi kudzera mukukula, koma kuwonjezera pa cellulose ether kudzakhudzanso kuchuluka kwa madzi, mpweya, kuyika nthawi ndi kuuma kwa matope. Zosiyanasiyana katundu.

Pofuna kutsogolera bwino chitukuko ndi kugwiritsa ntchito matope a mchenga wa slag, pamaziko a ntchito yapitayi yofufuza pamatope a mchenga wa slag, pepala ili limagwiritsa ntchito mitundu iwiri ya viscosities (2000mPa).·s ndi 6000mPa·s) ya hydroxypropyl methyl cellulose ether (HPMC) Chitani kafukufuku woyesera pa chikoka cha matope a chitsulo cha slag champhamvu kwambiri pakugwira ntchito (fluidity ndi kusungidwa kwa madzi) ndi kukakamiza komanso kusinthasintha mphamvu.

1. Gawo loyesera

1.1 Zopangira

Simenti: Onoda P·II 52.5 giredi simenti.

Mchenga wachitsulo wachitsulo: Chosinthira chitsulo chosinthira chopangidwa ndi Shanghai Baosteel chimakonzedwa ndi njira yotentha yopangira zinthu, yokhala ndi kachulukidwe kochulukirapo ka 1910kg/m.³, ya mchenga wapakati, ndi fineness modulus ya 2.3.

Chotsitsa madzi: chotsitsa madzi cha polycarboxylate (PC) chopangidwa ndi Shanghai Gaotie Chemical Co., Ltd., mu mawonekedwe a ufa.

Latex ufa: Model 5010N yoperekedwa ndi Wacker Chemicals (China) Co., Ltd.

Defoamer: Code P803 mankhwala operekedwa ndi German Mingling Chemical Group, ufa, kachulukidwe 340kg/m³, imvi sikelo 34% (800°C), pH mtengo 7.2 (20°C DIN ISO 976, 1% MU DIST, madzi).

Cellulose ether: hydroxypropyl methylcellulose ether yoperekedwa ndiMalingaliro a kampani Kima Chemical Co., Ltd., yomwe ili ndi viscosity ya 2000mPa·s imatchedwa HPMC2000, ndipo yomwe ili ndi kukhuthala kwa 6000mPa·s imatchedwa HPMC6000.

Kusakaniza madzi: madzi apampopi.

1.2 Chiŵerengero choyesera

Chiŵerengero cha simenti-mchenga wa matope a slag-mchenga omwe anakonzedwa kumayambiriro kwa mayeserowo anali 1: 3 (chiŵerengero cha misa), chiŵerengero cha madzi-simenti chinali 0,50 (chiŵerengero cha misa), ndipo mlingo wa polycarboxylate superplasticizer unali 0,25% (chiwerengero cha simenti, zomwezo pansipa. ), ufa wa latex ndi 2.0%, ndipo zomwe zili ndi defoamer ndi 0.08%. Poyerekeza zoyesera, Mlingo wa ma ether awiri a cellulose HPMC2000 ndi HPMC6000 anali 0.15%, 0.20%, 0.25% ndi 0.30%, motsatana.

1.3 Njira yoyesera

Mortar Fluidity Test Method: konzani matope molingana ndi GB/T 17671-1999 "Cement Mortar Strength Test (ISO Method)", gwiritsani ntchito nkhungu yoyesera mu GB/T2419-2005 "Cement Mortar Fluidity Test Method", ndikusonkhezera Thirani matope abwino. mu nkhungu yoyeserera mwachangu, pukutani matope ochulukirapo ndi chopukutira, kwezani nkhungu yoyeserera molunjika m'mwamba, ndipo matopewo akapanda kuyendereranso, yesani kutalika kwa dera lofalikira la matope ndi m'mimba mwake molunjika, ndi Tengani mtengo wapakati, zotsatira zake ndi zolondola mpaka 5mm.

Kuyesa kwa kuchuluka kwa madzi osungiramo matope kumachitika molingana ndi njira yomwe yafotokozedwa mu JGJ/T 70-2009 "Njira Zoyesera Zopangira Zinthu Zoyambira Zomangamanga".

Kuyesedwa kwa mphamvu yopondereza ndi mphamvu yosinthika yamatope imachitika molingana ndi njira yomwe yafotokozedwa mu GB/T 17671-1999, ndipo mibadwo yoyesa ndi masiku 3, masiku 7 ndi masiku 28 motsatana.

2. Zotsatira ndi zokambirana

2.1 Mphamvu ya cellulose ether pakugwira ntchito kwa matope a mchenga wa slag

Kuchokera ku zotsatira za zosiyana za cellulose ether pa kusungirako madzi kwa matope a mchenga wa slag, zikhoza kuwonedwa kuti kuwonjezera HPMC2000 kapena HPMC6000 kungathandize kwambiri kusunga madzi amatope atsopano osakanikirana. Ndi kuchuluka kwa zomwe zili mu cellulose ether, kuchuluka kwa madzi osungiramo matope kunakula kwambiri ndipo kenako kukhazikika. Pakati pawo, pamene zomwe zili mu cellulose ether ndi 0,15% yokha, kuchuluka kwa madzi osungiramo matope kumawonjezeka ndi pafupifupi 10% poyerekeza ndi popanda kuwonjezera, kufika 96%; pamene zomwe zili zikuwonjezeka kufika pa 0.30%, madzi osungira madzi amatope ndi okwera mpaka 98.5%. Zitha kuwoneka kuti kuwonjezera kwa cellulose ether kumatha kusintha kwambiri kusungidwa kwamadzi kwamatope.

Kuchokera ku chikoka cha osiyana Mlingo wa mapadi efa pa fluidity zitsulo slag mchenga matope, tingaone kuti pamene mlingo wa mapadi efa ndi 0,15% ndi 0,20%, alibe zotsatira zoonekeratu pa fluidity matope; pamene mlingo ukuwonjezeka kufika 0,25% kapena pamwamba , ali ndi mphamvu yaikulu pa fluidity, koma fluidity akhoza anakhalabe pa 260mm ndi pamwamba; pamene ma etha awiri a cellulose ali mumtengo wofanana, poyerekeza ndi HPMC2000, zotsatira zoyipa za HPMC6000 pamadzi amadzimadzi ndizodziwikiratu.

Hydroxypropyl methyl cellulose ether ndi polima yopanda ionic yokhala ndi madzi osungira bwino, ndipo mkati mwamtundu wina, kukhuthala kwakukulu, kumapangitsa kuti madzi asungidwe bwino komanso kuwonjezereka kwamadzimadzi. Chifukwa chake ndi chakuti gulu la hydroxyl pa unyolo wa maselo ake ndi atomu ya okosijeni pa mgwirizano wa ether ukhoza kupanga zomangira za haidrojeni ndi mamolekyu amadzi, kupanga madzi aulere kukhala madzi omangika. Choncho, pa mlingo womwewo, HPMC6000 akhoza kuonjezera mamasukidwe akayendedwe a matope kuposa HPMC2000, kuchepetsa fluidity wa matope, ndi kuonjezera mlingo posungira madzi moonekeratu. Document 10 akufotokoza chodabwitsa pamwamba popanga njira viscoelastic pambuyo mapadi efa kusungunuka m'madzi, ndi makhalidwe otaya katundu ndi mapindikidwe. Zitha kuganiziridwa kuti matope a slag okonzedwa mu pepalali ali ndi madzi ambiri, omwe amatha kufika 295mm popanda kusakaniza, ndipo mapindikidwe ake ndi aakulu. Pamene cellulose ether ikuwonjezeredwa, slurry idzayenda mozungulira, ndipo mphamvu yake yobwezeretsa mawonekedwe ndi yaying'ono, choncho imayambitsa kuchepa kwa kuyenda.

2.2 Mphamvu ya cellulose ether pa mphamvu ya matope a mchenga wa slag

Kuphatikizika kwa cellulose ether sikumangokhudza magwiridwe antchito a matope a mchenga wa slag, komanso kumakhudzanso makina ake.

Kuchokera ku zotsatira za Mlingo wosiyanasiyana wa mapadi efa pa compressive mphamvu ya zitsulo slag mchenga matope, tingaone kuti pambuyo kuwonjezera HPMC2000 ndi HPMC6000, compressive mphamvu ya matope pa mlingo uliwonse kumawonjezera ndi zaka. Kuwonjezera HPMC2000 alibe zotsatira zoonekeratu pa 28-day compressive mphamvu ya matope, ndi kusinthasintha mphamvu si lalikulu; pamene HPMC2000 imakhudza kwambiri mphamvu zoyamba (masiku atatu ndi 7), zomwe zikuwonetsa kuchepa kwachidziŵikire, ngakhale kuti mlingo ukuwonjezeka kufika pa 0,25% ndi Pamwambapa, mphamvu yopondereza yoyambirira inakula pang'ono, koma yotsika kuposa iyo kuwonjezera. Pamene zili HPMC6000 ndi otsika kuposa 0.20%, zotsatira pa masiku 7 ndi 28 masiku compressive mphamvu si zoonekeratu, ndi 3-day compressive mphamvu amachepetsa pang'onopang'ono. Pamene zomwe zili mu HPMC6000 zinawonjezeka kufika ku 0,25% ndi pamwamba, mphamvu za masiku 28 zinawonjezeka kufika pamlingo wina, kenako zinachepa; mphamvu ya masiku 7 inachepa, ndipo kenako inakhazikika; mphamvu ya masiku a 3 inachepa mokhazikika. Choncho, zikhoza kuganiziridwa kuti ma cellulose ethers ndi ma viscosities awiri a HPMC2000 ndi HPMC6000 alibe zotsatira zoonekeratu zowonongeka pa mphamvu ya 28-day compressive yamatope, koma kuwonjezera kwa HPMC2000 kumakhala ndi zotsatira zoonekeratu zoipa pa mphamvu yoyambirira ya matope.

HPMC2000 ili ndi magawo osiyanasiyana a kuwonongeka kwa mphamvu yosunthika yamatope, ziribe kanthu kumayambiriro (masiku 3 ndi masiku 7) kapena mochedwa (masiku 28). Kuphatikiza kwa HPMC6000 kumakhalanso ndi vuto linalake pa mphamvu yosinthika yamatope, koma kuchuluka kwake kumakhala kochepa kuposa HPMC2000.

Kuphatikiza pa ntchito yosungira madzi ndi kukhuthala, cellulose ether imachedwetsanso njira ya hydration ya simenti. Makamaka chifukwa cha ma adsorption a cellulose ether mamolekyu pa zinthu za simenti hydration, monga calcium silicate hydrate gel ndi Ca (OH) 2, kupanga chophimba chophimba; Komanso, kukhuthala kwa njira ya pore kumawonjezeka, ndipo cellulose ether imalepheretsa kusamuka kwa Ca2 + ndi SO42- mu pore yankho kumachedwetsa ndondomeko ya hydration. Choncho, mphamvu yoyambirira (masiku atatu ndi masiku 7) ya matope osakanikirana ndi HPMC inachepetsedwa.

Kuwonjezera mapadi efa mu matope kupanga ambiri thovu lalikulu ndi awiri a 0.5-3mm chifukwa mpweya-entraining zotsatira za mapadi efa, ndi mapadi efa nembanemba kapangidwe ndi adsorbed pamwamba pa thovu izi, amene kuti a kumlingo wina amathandizira kukhazikika kwa thovu. udindo, potero kufooketsa mphamvu ya defoamer mu matope. Ngakhale kuti matope opangidwa ndi mpweya ali ngati mayendedwe a mpira mumatope osakanikirana, omwe amachititsa kuti ntchitoyo ikhale yogwira ntchito, pamene matope akhazikika komanso owumitsidwa, matope ambiri amakhalabe mumatope kuti apange pores odziimira okha, omwe amachepetsa kachulukidwe kameneka ka matope. . Mphamvu yopondereza ndi mphamvu yosunthika imachepa moyenerera.

Tingaone kuti pokonzekera zitsulo slag mchenga wapadera matope ndi fluidity mkulu, mlingo mkulu posungira madzi ndi mphamvu mkulu, Ndi bwino kugwiritsa ntchito HPMC6000, ndi mlingo sayenera kukhala wamkulu kuposa 0,20%.

Pomaliza

Zotsatira za ma viscosities awiri a cellulose ethers (HPMC200 ndi HPMC6000) pa kusungirako madzi, fluidity, compressive ndi flexural mphamvu ya zitsulo slag mchenga matope anaphunziridwa mwa zoyesera, ndi limagwirira ntchito mapalo etere mu zitsulo slag mchenga matope anali kusanthula. Zotsatirazi:

(1) Mosasamala kanthu za kuwonjezera HPMC2000 kapena HPMC6000, kuchuluka kwa madzi osungiramo matope atsopano osakanikirana ndi zitsulo za slag kumatha kusintha kwambiri, ndipo ntchito yake yosungira madzi imatha kuwongolera.

(2) Pamene mlingo ndi wotsika kuposa 0,20%, zotsatira za kuwonjezera HPMC2000 ndi HPMC6000 pa fluidity zitsulo slag mchenga matope si zoonekeratu. Pamene zili ukuwonjezeka 0,25% ndi pamwamba, HPMC2000 ndi HPMC6000 ndi zotsatira zoipa pa fluidity zitsulo slag mchenga matope, ndi zotsatira zoipa za HPMC6000 ndi zoonekeratu.

(3) Kuwonjezera kwa HPMC2000 ndi HPMC6000 alibe zotsatira zoonekeratu pa 28-day compressive mphamvu ya zitsulo slag mchenga matope, koma HPMC2000 ali ndi zotsatira zoipa kwambiri oyambirira compressive mphamvu ya matope, ndi mphamvu flexural ndi mwachionekere zoipa. Kuwonjezera HPMC6000 ali ndi zotsatira zoipa pa flexural mphamvu ya zitsulo slag-mchenga matope pa mibadwo yonse, koma mlingo wa zotsatira kwambiri m'munsi kuposa HPMC2000.