I-HPMC isebenzisa kwikhonkrithi

Intshayelelo

Okwangoku, i-foam esetyenziselwa ukwenza ikhonkrithi enegwebu ingasetyenziselwa kuphela ukwenza ikhonkrithi enegwebu xa inobunzima obaneleyo kunye nokuzinza xa ixutywe kunye ne-slurry kwaye ingenayo impembelelo embi kwi-condensation kunye nokuqina kwezinto ze-cementitious. Ngokusekwe koku, ngovavanyo, ukongeza i-hydroxypropyl methyl cellulose (HPMC), eluhlobo lwento yozinziso yogwebu, ukuphucula ukusebenza kwekhonkrithi ephinda isetyenzisiwe yomgubo owenziwe ngamagwebu waphononongwa.

Amagwebu ngokwawo umgangatho olungileyo embi imisela umgangatho wekhonkrithi, ingakumbi kwi-concrete yokuvuselela umgubo we-foam, inkunkuma yekhonkrithi emva kokutyunyuzwa, i-powder ye-mill, eyenziwe ngobukho bayo abaninzi abangalingani kunye namasuntswana kunye ne-pore ye-edges kunye neekona, xa kuthelekiswa ne-foam eqhelekileyo. ikhonkrithi, amaqamza omgubo asetyenzisiweyo kwikhonkrithi yogwebu phantsi kwempembelelo yomatshini inzima kakhulu. Ngoko ke, ngcono ukuqina, ubungakanani bepore encinci, ukufana kunye nokusasazeka kwe-foam kwi-slurry, umgangatho ungcono we-micropowder ene-foamed concrete. Nangona kunjalo, kubaluleke kakhulu ukwenza amagwebu ngokuqina okuphezulu, ubungakanani obulinganayo bepore kunye nokuma. Kwinkqubo yokusebenzisa i-agent ye-foam, i-foam stabilizer idlala indima ebaluleke kakhulu. Ininzi ye-foam stabilizer yi-glue material, enokunyusa i-viscosity yesisombululo kunye nokutshintsha umbane wayo xa inyibilika emanzini. Xa isetyenziswa kunye ne-ejenti egwebu amagwebu, inyusa ngokuthe ngqo i-viscosity yefilim engamagwebu, inyusa ukuqina kwamaqamza kunye nokomelela komphezulu wefilimu elulwelo.1 uvavanyo

1.1 imathiriyeli ekrwada

(1) Isamente: 42.5 isamente eqhelekileyo yasePortland.

(2) Umgubo ocoliweyo osetyenzisiweyo: Imizekelo yekhonkrithi eshiyiweyo elabhoratri yakhethwa yaza yatyunyuzwa yangamasuntswana anomlinganiselo ongaphantsi kwe-15mm ngesityumzi somhlathi, emva koko ifakwe kwilitye lokusila. Kulo mvavanyo, i-micropowder elungiselelwe ngexesha lokugaya le-60min likhethiwe.

(3) Iarhente yogwebu:iarhente yogwebu yesepha, ulwelo olubonakala lutyheli olululo.

(4) I-Foam stabilizer: i-hydroxypropyl methyl cellulose (HPMC), ibakala lezinto zokwakha zoshishino, umgubo, u-soluble lula emanzini.

(5) Amanzi: amanzi okusela. Iimpawu eziphambili zezinto zesamente .

1.2 Uyilo lodibaniso lodibaniso nokubala

1.2.1 Uyilo lokuxuba

Ngexesha lovavanyo, unokonyusa okanye unciphise umgubo ohlaziyekayo wekhonkrithi yogwebu kumxholo, ukulungelelanisa ubungakanani boxinaniso olomileyo, ngokwenza umzekeliso wobungakanani bobungakanani bomthamo, ubungakanani bokwenyani kunye noyilo kuqikelelo olurhabaxa lwempazamo yovavanyo lokuyila, igwebu elinokuhlaziywa ubumanzi obuqinileyo bolawulo lobungakanani bodaka ngaphakathi kwe-180 mm + 20 mm.

1.2.2 Ukubalwa komlinganiselo womxube

Uyilo ngalunye lokubumba amaqela ali-9 eebhloko eziqhelekileyo (100mmx100mmx100mm), umgangatho

Umthamo opheleleyo webhloko yovavanyo V0 = (0.1 × 0.1 × 0.1) x27 = 2.7 × 10-2m3, setha umthamo opheleleyo V =

1.2×2.7×10-2 = 3.24×10-2m3, idosi ye-arhente enogwebu M0 = 0.9V = 0.9×3.24×10-2 =

I-2.916 × 10-2kg, amanzi afunekayo kwi-arhente yokuhlambulula amagwebu yi-MWO.

2. Iziphumo zovavanyo kunye nengxoxo

Ngokulungelelanisa idosi ye-HPMC, impembelelo yeenkqubo ezahlukeneyo zamagwebu kwiipropati ezisisiseko zekonkrithi ephinda isetyenziswe umgubo owenziwe ngamagwebu yahlalutywa. Iipropati zomatshini zomzekelo ngamnye zavavanywa.

2.1 Impembelelo yedosi ye-HPMC ekusebenzeni kogwebu

Okokuqala, makhe sijonge “amaqamza amancinci” kunye “namaqamza angqingqwa”. Ugwebu lusasazo lwerhasi elulwelo. Amaqamza anokohlulwa abe "ngamaqamza abhityileyo" anolwelo oluninzi kunye negesi encinci kunye "neqamza elishinyeneyo" elinolwelo oluninzi kunye negesi encinci. Ngenxa yobukho isixa esikhulu iqamza lamanzi, kunye fluidity eliphezulu, udaka olunogwebu lwekhonkrithi eyenziwe ibhityile kakhulu, kwaye amanzi iqamza ngakumbi, kulula ukuvelisa amanzi omxhuzulane, ngoko ke umgubo owenziwe ngokutsha umgubo ikhonkrithi elungiselelwe ngamandla aphantsi, ngaphezulu i-pores edibeneyo, i-foam engaphantsi. Irhasi eninzi yolwelo oluncinci igwebu, ukwakheka kwestoma kuxinene, kwahlulwe kuphela ngumaleko obhityileyo wefilim yamanzi, ukuqokelelana koxinzelelo lwegwebu luxineneyo lweqamza elibhityileyo, ukubumba ukuphuma kokuhlaziywa komgubo ocoliweyo wekhonkrithi ovaliweyo, amandla aphezulu, aphezulu. -umgangatho we-foam.

Ngokunyuka kwedosi ye-HPMC, ubuninzi be-foam bunyuka ngokuthe ngcembe, nto leyo ebonisa ukuba igwebu liya lixinene ngakumbi, i-arhente enogwebu ekhupha ugwebu kaninzi ngaphambi kokuba i-0.4% ibe nefuthe eliphuculweyo, ngaphezu kwe-0.4% emva kwempembelelo yokuthintela, ebonisa ukuba i-viscosity yesisombululo se-ejenti yogwebu iyanda, ichaphazela isakhono sogwebu. Ngokunyuka kwedosi ye-HPMC, ukukhutshwa kogwebu kunye nomgama wokuhlaliswa ngokuthe ngcembe wehla ngokwamanani. Ngaphambi kwe-0.4%, izinga lokuhla likhulu, kwaye xa izinga lidlula i-0.4%, izinga liyancipha, libonisa ukuba ngokunyuka kwe-viscosity yesisombululo se-ejenti enogwebu, ulwelo kwifilimu yolwelo lwe-bubble akukho lula ukukhupha okanye ukukhupha kakhulu. encinci, kwaye ulwelo phakathi kwamaqamza akukho lula ukuhamba. Ubungqingqwa befilimu yolwelo lweqamza buyancipha ngokucothayo, ixesha lokugqabhuka kweqamza liyakhula, ukomelela komphezulu wefilimu ye-bubble lulwelo luyandiswa, ugwebu lukwanalo nenqanaba elithile lokunwebeka, ukwenzela ukuba uzinzo lwegwebu.

Iphuculwe kakhulu. Ixabiso lomgama wokuhlalisa emva kwe-0.4% liphinda libonise ukuba i-foam izinzile ngeli xesha. Umatshini we-foam unzima u-foam kwi-0.8%, kwaye ukusebenza kwe-foam kuyona nto ingcono kakhulu kwi-0.4%, kwaye ubuninzi be-foam yi-59kg / m3 ngeli xesha.

2.2 Impembelelo yesiqulatho se-HPMC kumgangatho woludaka lwekhonkrithi esetyenzisiweyo ngokutsha

Ngokunyuka komxholo we-HPMC, ukuhambelana kwe-slurry kuyanda. Xa umxholo ungaphantsi kwe-0.4%, ukuhambelana kukhula ngokukhawuleza kwaye ngokukhawuleza, kwaye xa umxholo ungaphezulu kwe-0.4%, izinga likhawuleza ngokukhawuleza, libonisa ukuba i-foam inzima kakhulu, i-bubble encinci yamanzi, kunye ne-viscosity ephezulu ye-foam. Kwinkqubo yokunyusa i-dosage, ubunzima be-foam kwi-slurry iyona nto ibhetele kwi-0.4% ~ 0.6%, kwaye umgangatho we-foam umpofu ngaphandle kolu luhlu. Xa umxholo ungaphantsi kwe-0.4%, ukusasazwa kwee-air pores kwi-slurry kufana ngokufanayo kwaye kubonisa indlela eqhubekayo yokuphucula. Xa umxholo udlula lo mxholo, ukusasazwa kweepores zomoya kubonisa ukuthambekela okuphawulekayo kokungalingani, okunokuthi kube ngenxa yokuxinana okugqithisileyo kunye ne-viscosity ye-foam kunye nokungahambi kakuhle kwamanzi, okubangela ukuba amaqamza angakwazi ukusasazwa ngokulinganayo kwi-slurry ngexesha lenkqubo yokuvuselela. .

2.3 Impembelelo yesiqulatho se-HPMC ekusebenzeni kwekhonkrithi ephinda isetyenzisiwe ye-micropowder enegwebu

Kungakhathaliseki ukuba i-foam iveliswa njani, ubukhulu beebhubhu kwi-foam abuyi kufana ngokupheleleyo. Uvavanyo lwenkunkuma esetyenzisiweyo yomgubo emva kokutyunyuzwa kwenkqubo yokusila, imilo yayo ayifani, igudileyo kwiqamza kunye nomxube we-slurry oxutyiweyo, imilo engaqhelekanga yodaka kunye neekona, i-spikes yamasuntswana inokuvelisa isiphumo esibi kakhulu sogwebu, banxibelelana kunokuba njengendawo yokunxibelelana nomphezulu, ukuvelisa uxinzelelo loxinzelelo, i-bubble ehlatywayo, ibangela amaqamza agqabhuke, ke, Ukulungiswa kwe-micropowder enegwebu ehlaziyiweyo kufuna uzinzo oluphezulu lwe-foam. Umzobo we-4 ubonisa umgaqo wempembelelo yeenkqubo ezahlukeneyo ze-foam ekusebenzeni kwekhonkrithi ye-micropowder eyenziwe ngokutsha.

Phambi kwe-0.4%, ingxinano eyomileyo yehla kancinci kwaye isantya sakhawuleza, kwaye ukufunxa kwamanzi kwaphuculwa. Emva kwe-0.4%, uxinano olomileyo luyatshintsha, kwaye izinga lokufunxa kwamanzi landa ngokukhawuleza. Kwi-3D, amandla oxinzelelo alukho umahluko phambi kwe-0.4%, kwaye ixabiso lamandla li malunga ne-0.9mpa. Emva kwe-0.4%, ixabiso lokuqina lincinci. Amandla oxinzelelo kwi-7d anomahluko ocacileyo. Ixabiso lamandla kwi-dosage ye-0.0 ngokucacileyo alikho likhulu njengaleyo kwi-0.2% kunye ne-0.4%, kodwa iphakamileyo kune-0.6% kunye ne-0.8%, kwaye ixabiso lamandla kwi-0.2% kunye ne-0.4% isenomohluko omncinci. Ukutshintsha kwexabiso lamandla kwi-28d ngokusisiseko kwakufana naleyo kwi-7d.

Idosi ye-0.0 esisiseko bonisa iqamza elibhityileyo, ukuqina kweqamza, uzinzo lubi, kwinkqubo yokuxuba uludaka kunye ne-specimen condense sclerosis, kukho ukuqhekeka kweqamza okuninzi, i-porosity yangaphakathi yomfanekiso iphezulu, emva kokwenza umfuziselo wokusebenza kakubi, kunye ukwanda kwedosi, ukusebenza kwayo ngokuthe ngcembe kuya kubangcono, iqamza eludaka lisasazeke ngakumbi ngokulungeleleneyo kwaye ligqabhuke ukuya kwinqanaba elingaphantsi, emva kokubunjwa, kukho imingxuma evalekileyo ngakumbi kwisakhiwo sangaphakathi somfanekiso, kunye nokumila, ukuvuleka kunye ne-porosity ye imingxuma iphuculwe ngcono, kwaye ukusebenza komzekelo kungcono. Ubonise i-trend yokunciphisa i-0.4%, amandla kunye nexabiso layo alikho phezulu njenge-0.0, inokuba ngenxa yokuba i-foam density kunye ne-viscosity inkulu kakhulu, i-illiquid imbangela kwinkqubo yokuxuba i-slurry, i-foam ayikwazi ukuxuba nodaka lwesamente, i-bubble can' t zihlakazwe kakuhle ngokulinganayo kwi-slurry, nto leyo ekhokelela ekubunjweni komzekelo ubukhulu beqondo elahlukileyo lamaqamza, Ngenxa yoko, kukho imingxunya emikhulu kunye nemingxunya edityanisiweyo kwisampulu emva kokuqina kunye nokuqina, okukhokelela kwisakhiwo esibi. , amandla aphantsi kunye nesantya esiphezulu sokufunxa amanzi kwimingxuma yangaphakathi yomzekelo. Kumzobo, esona sizathu siphambili sokutshintsha amandla kukudityaniswa kwepore kwindawo engaphakathi yekhonkrithi ye-foam micropowder.

Ukuphuculwa kolwakhiwo kukwabonisa ukuba i-HPMC ayinayo impembelelo embi ekufakweni kwamanzi kwisamente. Xa umxholo we-HPMC uphakathi kuluhlu lwe-0.2% ~ 0.4%, amandla e-micropowder efoamed ikhonkrithi engcono.

3 isiphelo

I-Foam yinto efunekayo yokwenza ikhonkrithi enegwebu, kwaye umgangatho wayo uhambelana ngokuthe ngqo nomgangatho wekhonkrithi enegwebu. Ukuze kuqinisekiswe uzinzo olwaneleyo lwamagwebu, i-agent egwebu amagwebu kunye ne-HPMC zixutywe ukusetyenziswa. Ukusuka kuhlalutyo lwegwebu, uludaka kunye nomgangatho wekonkrithi wokugqibela, kufumaniseka ukuba:

(1) Ukongezwa kwe-HPMC kunesiphumo esihle sokuphucula ekusebenzeni kwe-foam. Xa kuthelekiswa ne-0.0, umlinganiselo we-agent ogwebu ugwebu lonyuka ngamaxesha angama-1.8, ukuxinana kwe-foam kwanda nge-21 kg / m3, i-1h yamanzi eyophayo yehla nge-48 mL, i-1h indawo yokuhlala yehla nge-15 mm;

(2) i-HPMC yongezwa ekuphuculeni ukuhlaziywa kwakhona komgangatho opheleleyo we-powder foam slurry ekhonkrithi, xa kuthelekiswa nokungaxutywa, ukwandisa ngokuqiqisayo ukuguquguquka kwe-slurry, ukuphucula umbane kunye nokuphucula ukuzinza kwe-bubble slurry, ukuphucula ukufana kwe-foam. ihlakazekile kwi-slurry, ukunciphisa umngxuma wokudibanisa, umngxuma omkhulu kunye nokuvela kwento efana nemodi yokuwa, i-dosage ye-0.4%, Emva kokuba i-specimen yokubunjwa inqunyulwe, i-aperture yayo incinci, imilo yomngxuma ijikeleze ngakumbi, ukuhanjiswa komngxuma kufana kakhulu;

(3) Xa isiqulatho se-HPMC yi-0.2% ~ 0.4%, i-28d yamandla e-compressive ye-micropowder enziwe ngokutsha ikhonkrithi enegwebu iphezulu, kodwa ngokuqwalasela ubuninzi bomileyo, ukufunxa kwamanzi kunye namandla okuqala, eyona nto ingcono xa umxholo we-HPMC ngu-0.4%. Ngeli xesha, ingxinano owomileyo 442 kg/m3, 7d amandla compressive 2.2mpa, 28d amandla compressive 3.0mpa, ukufunxa amanzi 28%. HPMC idlala indima elungileyo ekusebenzeni ngokutsha micro-umgubo ikhonkrithi foamed, nto leyo ebonisa ukuba HPMC ukulungelelaniswa kakuhle kunye nokuhambelana xa isetyenziswe ngokutsha micro-umgubo ikhonkrithi foamed.