HPMC imagwiritsa ntchito konkriti

Mawu oyamba

Pakalipano, thovu lomwe limagwiritsidwa ntchito popanga konkire lopangidwa ndi thovu lingagwiritsidwe ntchito popanga konkriti yokhala ndi thovu pamene ili ndi kulimba kokwanira komanso kukhazikika pamene ikusakanikirana ndi slurry ndipo ilibe vuto lililonse pa condensation ndi kuumitsa kwa zipangizo za cementitious. Kutengera izi, kudzera mu zoyeserera, kuwonjezera hydroxypropyl methyl cellulose (HPMC), yomwe ndi mtundu wa chinthu chokhazikika cha thovu, kuti ipititse patsogolo magwiridwe antchito a konkire yaufa yopangidwanso ndi thovu.

Chithovu palokha khalidwe zabwino zoipa zimatsimikizira khalidwe la konkire, makamaka regenerative ufa thovu konkire, zinyalala konkire pambuyo kuphwanya, mpira mphero ufa, wopangidwa ndi kukhalapo kwake ambiri osagwirizana ndi particles ndi pore m'mbali ndi ngodya, poyerekeza ndi thovu wamba. konkire, zobwezerezedwanso ufa thovu mu thovu konkire pansi makina zimakhudza kwambiri. Choncho, ndi bwino toughness, yaing'ono pore kukula, ofanana ndi kubalalitsidwa kwa thovu mu slurry, ndi bwino khalidwe la zobwezerezedwanso micropowder thovu konkire. Komabe, ndikofunikira kwambiri kupanga zithovu zolimba kwambiri, kukula kwa pore ndi mawonekedwe. Pogwiritsa ntchito thovu, stabilizer ya thovu imagwira ntchito yofunika kwambiri. Ambiri a thovu stabilizer ndi zomatira zakuthupi, amene angathe kuonjezera mamasukidwe akayendedwe a yankho ndi kusintha fluidity ake kusungunuka m'madzi. Pamene ntchito pamodzi ndi thovu wothandizila, mwachindunji kumawonjezera madzi filimu mamasukidwe akayendedwe a thovu, kumawonjezera elasticity wa thovu ndi pamwamba mphamvu ya madzi filimu.1 mayeso

1.1 zinthu zopangira

(1) Simenti: simenti ya 42.5 wamba ya Portland.

(2) Zobwezerezedwanso bwino ufa: The anasiya konkire toyesa mu labotale anasankhidwa ndi wophwanyidwa kwa particles ndi tinthu kukula zosakwana 15mm ndi nsagwada crusher, ndiyeno kuika mu mpira mphero akupera. Mukuyesera uku, micropowder yokonzedwa ndi nthawi yopera ya 60min idasankhidwa.

(3) Foaming wothandizira: sopo thovu wothandizila, ndale kuwala yellow viscous madzi.

(4) Foam stabilizer: hydroxypropyl methyl cellulose (HPMC), mafakitale zomangamanga kalasi, ufa, mosavuta sungunuka m'madzi.

(5) Madzi: kumwa madzi. Waukulu thupi katundu cementitious zipangizo .

1.2 Sakanizani kamangidwe ka chiŵerengero ndi kuwerengera

1.2.1 Sakanizani kapangidwe

Pamayesero, akhoza kuonjezera kapena kuchepetsa zongowonjezwdwa ufa thovu konkire mu zili, kusintha kukula kwa kachulukidwe youma, mwa kupanga chitsanzo voliyumu kusiyana kukula, kukula kwenikweni ndi mamangidwe kwa akhakula kuyerekezera zolakwa digiri ya kapangidwe kuyesera, zongowonjezwdwa ufa thovu. konkriti fluidity ya slurry kukula kulamulira mkati mwa 180 mm + 20 mm.

1.2.2 Kuwerengera kwa chiŵerengero chosakaniza

Aliyense chiŵerengero kapangidwe akamaumba 9 magulu midadada muyezo (100mmx100mmx100mm), muyezo

Voliyumu yonse ya block block V0 = (0.1 × 0.1 × 0.1) x27 = 2.7 × 10-2m3, ikani voliyumu yonse V =

1.2×2.7×10-2 = 3.24×10-2m3, mlingo wa thovu M0 =0.9V = 0.9×3.24×10-2 =

2.916 × 10-2kg, madzi ofunikira kuti achepetse thovu ndi MWO.

2. Zotsatira zoyeserera ndi kukambirana

Posintha mlingo wa HPMC, mphamvu ya machitidwe osiyanasiyana a thovu pazinthu zoyambira za konkire yaufa wopangidwanso ndi thovu idawunikidwa. Mawonekedwe a makina a chitsanzo chilichonse adayesedwa.

2.1 Mphamvu ya mlingo wa HPMC pakuchita thovu

Choyamba, tiyeni tiwone "mathovu owonda" ndi "mathovu okhuthala". Foam ndi kumwazikana kwa gasi mumadzimadzi. Mibulu imatha kugawidwa kukhala "kuwira pang'ono" kokhala ndi madzi ochulukirapo komanso mpweya wocheperako komanso "kuwira kokhuthala" kokhala ndi madzi ambiri komanso mpweya wochepera. Chifukwa cha kukhalapo kwa kuchuluka kwa madzi kuwira, ndi mkulu fluidity, thovu konkire slurry anapanga ndi woonda kwambiri, ndi kuwira madzi kwambiri, zosavuta kutulutsa mphamvu yokoka ngalande, kotero zobwezerezedwanso ufa thovu konkire anakonza ndi otsika mphamvu, zambiri olumikizidwa pores, ndi otsika thovu. Mpweya wochuluka wamadzimadzi ocheperapo chithovu, mapangidwe a stoma ndi wandiweyani, olekanitsidwa ndi filimu yopyapyala yamadzi, kudzikundikira kwa kachulukidwe ka thovu ndi kachulukidwe kakang'ono ka thovu, kachulukidwe ka thovu, kupangidwa kuchokera ku kubadwanso kwa yaying'ono ufa thovu konkire chatsekedwa pores, mphamvu yayikulu, ndi yayikulu. - thovu labwino.

Ndi kuchuluka kwa mlingo wa HPMC, kuchuluka kwa thovu kumawonjezeka pang'onopang'ono, kusonyeza kuti chithovucho ndi chochuluka kwambiri, chomwe chimatulutsa thovu, chomwe chimatulutsa thovu pafupifupi 0.4% chisanakhale ndi mphamvu yowonjezereka, kupitirira 0.4% pambuyo pa kulepheretsa, kusonyeza kuti mamasukidwe akayendedwe a thovu wothandizira njira kumawonjezera, zimakhudza thovu luso. Ndi kuwonjezeka kwa mlingo wa HPMC, kutuluka kwa thovu ndi mtunda wokhazikika kumachepa pang'onopang'ono. Pamaso pa 0,4%, mlingo wa kuchepa ndi waukulu, ndipo pamene mlingo uposa 0,4%, mlingo amachepetsa, kusonyeza kuti ndi kuwonjezeka thobvu wothandizira njira mamasukidwe akayendedwe, madzi mu kuwira madzi filimu si zophweka kutulutsa kapena kumaliseche kwambiri. yaing'ono, ndi madzi pakati thovu si zophweka kuyenda. The kuwira madzi filimu makulidwe amachepetsa pang`onopang`ono, kuwira kuphulika nthawi yaitali, kuwira madzi filimu pamwamba mphamvu kumatheka, thovu ali ndi mlingo winawake wa elasticity, kuti bata la thovu.

Yawonjezeredwa kwambiri. Kutalika kwa mtunda wokhazikika pambuyo pa 0.4% kumawonetsanso kuti thovu liri lokhazikika panthawiyi. Makina otulutsa thovu ndi ovuta kutulutsa thovu pa 0.8%, ndipo magwiridwe antchito a thovu ndi abwino kwambiri pa 0.4%, ndipo kachulukidwe ka thovu ndi 59kg/m3 panthawiyi.

2.2 Mphamvu ya zomwe zili mu HPMC pamtundu wa slurry waufa wopangidwanso ndi thovu la konkriti

Ndi kuchuluka kwa HPMC zili, kugwirizana kwa slurry kumawonjezeka. Pamene zomwe zili pansi pa 0,4%, kugwirizana kumawonjezeka pang'onopang'ono, ndipo pamene zomwe zili pamwamba pa 0,4%, mlingowo umathamanga kwambiri, kusonyeza kuti chithovucho ndi chochuluka kwambiri, madzi ochepa kwambiri, komanso kukhuthala kwa thovu. Powonjezera mlingo, chithovu chochuluka mu slurry ndichopambana kwambiri pamtundu wa 0.4% ~ 0.6%, ndipo khalidwe la thovu ndi losauka kunja kwa izi. Pamene zomwe zili pansi pa 0.4%, kugawidwa kwa ma pores a mpweya mu slurry kumakhala kofanana ndipo kumasonyeza kusintha kosasintha. Pamene zili kuposa zilili, kugawa mpweya pores limasonyeza kwambiri m'njira yosagwirizana, amene angakhalenso chifukwa cha kachulukidwe kwambiri ndi mamasukidwe akayendedwe a thovu ndi osauka fluidity, chifukwa mu thovu sangathe wogawana omwazika mu slurry pa yoyambitsa ndondomeko. .

2.3 Chikoka cha zomwe zili mu HPMC pakuchita konkriti yobwezerezedwanso ndi thovu la micropowder

Ziribe kanthu momwe thovu limapangidwira, kukula kwa thovu mu thovu sikudzakhala kofanana. Mayeso a zobwezerezedwanso zinyalala ufa pambuyo kuphwanya dongosolo akupera, mawonekedwe ake si yunifolomu, yosalala mu kuwira ndi wosanganiza slurry kusanganikirana, kusakhazikika mawonekedwe a slurry m'mbali ndi ngodya, spikes wa particles akhoza kutulutsa kwambiri chokhwima zotsatira za thovu, iwo kukhudzana kuposa monga mfundo kukhudzana ndi pamwamba, kutulutsa maganizo ndende, kubaya kuwira, kuchititsa thovu anaphulika, kotero, Kukonzekera zobwezerezedwanso micropowder thovu konkire amafuna apamwamba bata la thovu. Chithunzi 4 chikuwonetsa mphamvu ya machitidwe osiyanasiyana a thovu pakugwira ntchito kwa konkire yopangidwanso ndi thovu la micropowder.

Pamaso pa 0.4%, kachulukidwe wowuma pang'onopang'ono adachepa ndipo kuchuluka kwake kunali kofulumira, ndipo kuyamwa kwamadzi kunakula. Pambuyo pa 0,4%, kachulukidwe kowuma amasintha, ndipo kuchuluka kwa mayamwidwe kumawonjezeka mwadzidzidzi. Mu 3D, mphamvu yopondereza ilibe kusiyana pamaso pa 0.4%, ndipo mphamvu yamphamvu ndi pafupifupi 0.9mpa. Pambuyo pa 0.4%, kuchuluka kwake kumakhala kochepa. Mphamvu yopondereza pa 7d ili ndi kusiyana koonekeratu. Mphamvu ya mphamvu pa mlingo wa 0.0 mwachiwonekere si yaikulu monga 0.2% ndi 0.4%, koma apamwamba kuposa 0.6% ndi 0.8%, ndipo mphamvu ya mphamvu pa 0,2% ndi 0,4% idakali ndi kusiyana kochepa. Kusintha kwa mphamvu pa 28d kunali kofanana ndi komwe ku 7d.

Mlingo wa 0.0 woyambira ukuwonetsa kuwira kwakuonda, kulimba kwa kuwira, kukhazikika kumakhala koyipa, pakusakanikirana kosakanikirana ndi slurry slurry sclerosis, pali kuphulika kwambiri, kuphulika kwamkati kwa chithunzicho ndikwambiri, pambuyo popanga fanizo losawoneka bwino, kuwonjezeka kwa mlingo, ntchito yake imakula bwino, kuwira mu slurry kunabalalika mofanana ndi kuphulika mpaka pang'ono, Pambuyo poumba, pali mabowo otsekedwa mkati mwa fanizo, ndi mawonekedwe, kabowo ndi porosity ya. mabowo amawongoleredwa bwino, ndipo magwiridwe antchito a sampuli amakhala bwino. Anasonyeza chizolowezi kuchepa 0,4%, mphamvu ndi mtengo si mkulu monga 0.0, mwina chifukwa kachulukidwe thovu ndi mamasukidwe akayendedwe ndi lalikulu kwambiri, illiquid chifukwa m`kati kusakaniza slurry, thovu sangathe kusakaniza ndi matope simenti, kuwira akhoza ' t kukhala obalalika bwino mu slurry, zomwe zimabweretsa kupanga chitsanzo ndi kukula kwa digiri yosiyana ya thovu, Chifukwa chake, pali mabowo akuluakulu ndi mabowo ogwirizana mu chitsanzo pambuyo pa kulimba ndi kuumitsa, zomwe zimapangitsa kuti zikhale zovuta. , mphamvu zochepa komanso kuchuluka kwa madzi otsekemera a mabowo amkati a chitsanzo. Pachithunzichi, chifukwa chachikulu cha kusintha kwa mphamvu ndi ma pore omwe ali mkati mwa konkire ya thovu la micropowder.

Kusintha kwa kapangidwe kake kukuwonetsanso kuti HPMC ilibe vuto lililonse pa hydration ya simenti. Pamene HPMC zili pafupifupi mu osiyanasiyana 0.2% ~ 0.4%, mphamvu zobwezerezedwanso konkire thovu thovu micropowder ndi bwino.

3 mapeto

Foam ndi chinthu chofunikira popanga konkriti yokhala ndi thovu, ndipo mtundu wake umagwirizana mwachindunji ndi konkriti yokhala ndi thovu. Pofuna kuonetsetsa kukhazikika kwa thovu, wothira thovu ndi HPMC amasakanikirana kuti agwiritse ntchito. Kuchokera pakuwunika kwa thovu, slurry ndi mtundu womaliza wa konkriti, zikuwoneka kuti:

(1) Kuphatikizika kwa HPMC kumakhala ndi zotsatira zabwino pakuchita chithovu. Poyerekeza ndi 0,0, ndi thobvu wothandizila thobvu chiŵerengero chinawonjezeka ndi 1.8 zina, thovu kachulukidwe chinawonjezeka ndi 21 makilogalamu/m3, 1h magazi madzi utachepa ndi 48 mL, 1h kuthetsa mtunda utachepa ndi 15 mm;

(2) HPMC anawonjezera kusintha kusinthika kwa khalidwe lonse la ufa thovu konkire slurry, poyerekeza osati kusakaniza, rationally kuwonjezera slurry kusasinthasintha, kusintha zamadzimadzi ndi kusintha bata wa slurry kuwira, kumapangitsanso chithovu chifanane. omwazika mu slurry, kuchepetsa dzenje lolumikiza, dzenje lalikulu ndi kutuluka kwa chodabwitsa monga kugwa, mlingo wa 0.4%, fanizo lowumba litadulidwa, kabowo kake ndi kakang'ono, mawonekedwe a dzenje ndi ozungulira kwambiri, kugawa dzenje ndi yunifolomu kwambiri;

(3) Pamene HPMC zili 0.2% ~ 0.4%, 28d compressive mphamvu ya zobwezerezedwanso thovu konkire micropowder thovu ndi apamwamba, koma kuganizira youma kachulukidwe, mayamwidwe madzi ndi mphamvu oyambirira, zabwino ndi pamene HPMC zili 0,4%. Panthawi imeneyi, youma kachulukidwe 442 makilogalamu/m3, 7d compressive mphamvu 2.2mpa, 28d compressive mphamvu 3.0mpa, mayamwidwe madzi 28%. HPMC imakhala ndi gawo labwino pakugwira ntchito kwa konkire yaufa yopangidwanso ndi thovu, zomwe zikuwonetsa kuti HPMC ili ndi kusinthika kwabwino komanso kuyanjana ikagwiritsidwanso ntchito mu konkire yaufa yopangidwanso ndi thovu.