Iselulosi ether kudaka lwesanti ye-slag

Ukusebenzisa iP·I-II 52.5 ye-cement ye-cement njenge-cementitious material kunye ne-steel slag sand as aggregate aggregate, isanti ye-slag yensimbi ene-fluidity ephezulu kunye namandla aphezulu ilungiswa ngokongeza izongezo zekhemikhali ezifana nokunciphisa amanzi, i-latex powder kunye ne-defoamer Udaka olukhethekileyo, kunye nemiphumo yezinto ezimbini ezahlukeneyo. iiviscosities (2000mPa·s kunye ne-6000mPa·s) ye-hydroxypropyl methylcellulose ether (HPMC) ekugcinweni kwayo kwamanzi, ulwelo kunye namandla afundwe. Iziphumo zibonisa ukuba: (1) Zombini i-HPMC2000 kunye ne-HPMC6000 inokunyusa kakhulu izinga lokugcinwa kwamanzi kudaka olutsha oluxutyiweyo kunye nokuphucula ukusebenza kwayo kokugcinwa kwamanzi; (2) Xa umxholo we-cellulose ether uphantsi, umphumo kumanzi omdaka awubonakali. Xa inyuswe ibe yi-0.25% okanye ngaphezulu, inefuthe elithile lokuwohloka kwi-fluidity of the mortar, phakathi kwayo i-deterioration effect ye-HPMC6000 ibonakala ngakumbi; (3) ukongezwa kwe-ether ye-cellulose ayinayo impembelelo ecacileyo kwi-28-day compressive force of the mortar, kodwa ukongezwa kwe-HPMC2000 Ixesha elingafanelekanga, kucacile ukuba akulungile kumandla okuguquguquka kweminyaka eyahlukeneyo, kwaye kwangaxeshanye kunciphisa kakhulu. ekuqaleni (iintsuku ezi-3 kunye neentsuku ezi-7) amandla oxinzelelo lodaka; (4) Ukongezwa kwe-HPMC6000 kunempembelelo ethile kumandla aguquguqukayo eminyaka eyahlukeneyo , kodwa ukunciphisa kwakungaphantsi kakhulu kunoko kwe-HPMC2000. Kweli phepha, kucingwa ukuba HPMC6000 kufuneka kukhethwe xa ulungiselela intsimbi slag isanti udaka olukhethekileyo kunye fluidity eliphezulu, izinga lokugcinwa kwamanzi aphezulu kunye namandla aphezulu, kunye nedosi kufuneka ingabi ngaphezu kwe-0.20%.

Amagama angundoqo:isanti ye-slag yensimbi; i-cellulose ether; i-viscosity; ukusebenza komsebenzi; amandla

intshayelelo

I-Slag yensimbi yimveliso yemveliso yentsimbi. Ngophuhliso lweshishini lesinyithi kunye nentsimbi, ukukhutshwa konyaka kwe-slag yensimbi kuye kwanda malunga neetoni ezizigidi ezili-100 kwiminyaka yamuva nje, kwaye ingxaki yokugcinwa kwempahla ngenxa yokungaphumeleli kokusetyenziswa kwezixhobo ngexesha elifanelekileyo kakhulu. Ngoko ke, ukusetyenziswa kobutyebi kunye nokulahlwa kwe-slag yensimbi ngokusebenzisa iindlela zesayensi kunye neendlela ezisebenzayo yingxaki engenakunakwa. I-Slag yensimbi ineempawu zoxinaniso oluphezulu, ukuthungwa okunzima kunye namandla aphezulu oxinzelelo, kwaye ingasetyenziselwa indawo yesanti yendalo kwi-samente yodaka okanye ikhonkrithi. I-Steel slag nayo ine-reactivity ethile. I-steel slag igaywa ibe ngumgubo othile we-fineness (i-steel slag powder). Emva kokuxutywa kwikhonkrithi, inokusebenzisa umphumo we-pozzolanic, onceda ukwandisa amandla e-slurry kunye nokuphucula inguqu ye-interface phakathi kwe-concrete aggregate kunye ne-slurry. indawo, ngaloo ndlela ukwandisa amandla ekhonkrithi. Nangona kunjalo, kufuneka kuthathelwe ingqalelo ukuba i-slag yensimbi ikhutshwe ngaphandle kwamanyathelo, i-calcium oxide yangaphakathi yamahhala, i-magnesium oxide yamahhala kunye nesigaba se-RO siya kubangela ukuzinza komthamo ombi we-slag yensimbi, ethintela kakhulu ukusetyenziswa kwe-slag yensimbi njenge-coarse kwaye iiaggregates ezilungileyo. Ukusetyenziswa kwidaka le-samente okanye ikhonkrithi. Wang Yuji et al. ishwankathela iinkqubo ezahlukeneyo zonyango lwe-slag yentsimbi kwaye yafumanisa ukuba i-slag yentsimbi ephathwa ngendlela eshushu yokugalela inozinzo oluhle kwaye inokuphelisa ingxaki yayo yokwandisa kwikhonkrithi yesamente, kunye nenkqubo yonyango eshushu eshushu yaphunyezwa eShanghai No. ixesha lokuqala. Ukongeza kwingxaki yokuzinza, i-steel slag aggregates nayo ineempawu ze-pores ezinqabileyo, i-multi-angles, kunye nexabiso elincinci lemveliso ye-hydration ebusweni. Xa zisetyenziswa njengee-aggregates ukulungisa udaka kunye nekhonkrithi, ukusebenza kwazo ngokufuthi kuchaphazeleka. Okwangoku, phantsi kwesiseko sokuqinisekisa ukuzinza kwevolumu, ukusebenzisa i-slag yensimbi njenge-aggregate edibeneyo ukulungiselela udaka olukhethekileyo lukhokelo olubalulekileyo lokusetyenziswa kobutyebi be-slag yensimbi. Uphononongo lufumene ukuba ukongeza isinciphisi samanzi, i-latex powder, i-cellulose ether, i-agent-entraining agent kunye ne-defoamer kwi-steel slag sand mortar inokuphucula ukusebenza komxube kunye nokusebenza lukhuni kwe-steel slag sand mortar njengoko kufuneka. Umbhali usebenzise imilinganiselo yokongeza i-latex powder kunye nezinye i-admixtures ukulungiselela isanti ye-slag isanti ephezulu yokulungisa udaka. Kwimveliso kunye nokusetyenziswa komdaka, i-cellulose ether yeyona nto ixhaphakileyo yokuxutywa kweekhemikhali. Ezona zisetyenziswa ngokuqhelekileyo ii-cellulose ethers kudaka yi-hydroxypropyl methyl cellulose ether (HPMC) kunye ne-hydroxyethyl methyl cellulose ether (HEMC). )Yima. I-ether ye-cellulose inokuphucula ukusebenza kodaka ukuya kumlinganiselo omkhulu, njengokunika udaka ukugcinwa kwamanzi okugqwesileyo ngokujiya, kodwa ukongeza i-ether ye-cellulose kuya kuchaphazela ukumanzi, umxholo womoya, ixesha lokumisela kunye nokuqina kodaka. Iipropati ezahlukeneyo.

Ukuze ukhokele ngcono uphuhliso kunye nokusetyenziswa kwentsimbi ye-slag udaka lwesanti, ngesiseko somsebenzi wophando wangaphambili kwi-steel slag sand mortar, eli phepha lisebenzisa iindidi ezimbini ze-viscosities (2000mPa).·s kunye ne-6000mPa·s) ye-hydroxypropyl methyl cellulose ether (HPMC) Yenza uphando lovavanyo malunga neempembelelo zentsimbi ye-slag isanti ephezulu yodaka ekusebenzeni kokusebenza (ukuguquguquka nokugcinwa kwamanzi) kunye namandla oxinzelelo kunye nokuguquguquka.

1. Inxalenye yovavanyo

1.1 Iimathiriyeli ekrwada

Isamente: Onoda P·II 52.5 grade isamente.

Isanti ye-Slag yensimbi: I-slag yentsimbi yokuguqula eveliswe yi-Shanghai Baosteel ilungiswa ngenkqubo yokuhlohla eshushu, kunye nokuxinana kwe-1910kg/m³, eyesanti ephakathi, kunye nemodyuli ye-fineness ye-2.3.

Isinciphisi samanzi: i-polycarboxylate water reducer (PC) eveliswe yi-Shanghai Gaotie Chemical Co., Ltd., kwifom yomgubo.

I-Latex powder: Imodeli ye-5010N enikezelwa yi-Wacker Chemicals (e-China) Co., Ltd.

I-Defoamer: Ikhowudi ye-P803 imveliso ebonelelwa yi-German Mingling Chemical Group, umgubo, ubuninzi be-340kg / m³, isikali esingwevu ngama-34% (800°C), ixabiso pH 7.2 (20°C DIN ISO 976, 1% EKUDIST, amanzi).

I-ether yeCellulose: i-hydroxypropyl methylcellulose ether ebonelelwa nguI-Kima Chemical Co., Ltd., leyo ine-viscosity ye-2000mPa·s yonyulwa njenge HPMC2000, kwaye leyo ine viscosity ye 6000mPa·s ibekwe njenge HPMC6000.

Ukuxuba amanzi: amanzi etephu.

1.2 Umlinganiselo wovavanyo

Umlinganiselo wesamente-isanti yentsimbi ye-slag-sand mortar elungiselelwe kwinqanaba lokuqala lovavanyo yayingu-1: 3 (umlinganiselo wobunzima), umlinganiselo wamanzi-samente wawuyi-0.50 (umlinganiselo omkhulu), kunye ne-dosage ye-polycarboxylate superplasticizer yayingu-0.25%. (ipesenti ye-cement mass, efanayo ngezantsi.), Umxholo we-latex powder ngu-2.0%, kunye nomxholo we-defoamer ngu-0.08%. Kwimifuniselo yokuthelekisa, iidosi ezimbini ze-cellulose ethers HPMC2000 kunye ne-HPMC6000 zaziyi-0.15%, 0.20%, 0.25% kunye ne-0.30%, ngokulandelanayo.

1.3 Indlela yokuvavanya

Indlela yoVavanyo lwe-Mortar Fluidity Test: lungisa udaka ngokwe-GB/T 17671-1999 "Uvavanyo lwamandla e-Cement Mortar (Indlela ye-ISO)", sebenzisa i-mold yokuvavanya kwi-GB/T2419-2005 "Indlela yoVavanyo lwe-Cement Mortar Fluidity Test", kwaye uvuselele Galela udaka olulungileyo. kwi-mold yovavanyo ngokukhawuleza, sula udaka olugqithisiweyo kunye ne-scraper, phakamisa ukubunjwa kovavanyo ngokuthe nkqo ukuya phezulu, kwaye xa udaka lungasaqhubeki, linganisa ubukhulu bendawo ebanzi yendawo yodaka kunye nobubanzi kwicala elithe nkqo, kwaye thatha ixabiso eliphakathi, isiphumo sichanekile kwi-5mm.

Uvavanyo lwezinga lokugcinwa kwamanzi lodaka lwenziwa ngokwendlela echazwe kwi-JGJ/T 70-2009 "Iindlela zoVavanyo lweePropati eziSisiseko zoMdaka woKwakha".

Uvavanyo lwamandla oxinzelelo kunye namandla aguquguqukayo odaka lwenziwa ngokwendlela echazwe kwi-GB / T 17671-1999, kwaye iminyaka yokuvavanya yimihla ye-3, iintsuku ze-7 kunye neentsuku ze-28 ngokulandelanayo.

2. Iziphumo kunye nengxoxo

2.1 Impembelelo ye-cellulose ether ekusebenzeni komsebenzi we-steel slag sand mortar

Ukususela kwisiphumo somxholo ohlukeneyo we-ether ye-cellulose ekugcinweni kwamanzi kwi-steel slag sand mortar, kunokubonwa ukuba ukongeza i-HPMC2000 okanye i-HPMC6000 inokuphucula ngokubonakalayo ukugcinwa kwamanzi odaka oluxutywe ngokutsha. Ngokunyuka komxholo we-cellulose ether, izinga lokugcinwa kwamanzi kwi-mortar liye landa kakhulu kwaye emva koko lahlala lizinzile. Phakathi kwabo, xa umxholo we-cellulose ether yi-0.15% kuphela, izinga lokugcinwa kwamanzi kwi-mortar linyuka malunga ne-10% xa kuthelekiswa naloo nto ngaphandle kokongezwa, ukufikelela kwi-96%; xa umxholo unyuswa ukuya kwi-0.30%, izinga lokugcinwa kwamanzi kwi-mortar liphezulu njenge-98.5%. Ingabonwa ukuba ukongezwa kwe-cellulose ether kunokuphucula kakhulu ukugcinwa kwamanzi omdaka.

Ukususela kwimpembelelo yeedosi ezahlukeneyo ze-cellulose ether kwi-fluidity yensimbi ye-slag sand mortar, kunokubonwa ukuba xa i-ether ye-cellulose i-0.15% kunye ne-0.20%, ayinayo impembelelo ecacileyo kwi-fluidity yodaka; xa idosi inyuka ukuya kwi-0.25% okanye ngaphezulu, inempembelelo enkulu kwi-fluidity, kodwa i-fluidity isenokugcinwa kwi-260mm nangaphezulu; xa ii-ethers zeselulosi ezimbini zikumlinganiselo ofanayo, xa kuthelekiswa ne-HPMC2000, ifuthe elibi le-HPMC6000 kulwelo lodaka lucace ngakumbi.

I-Hydroxypropyl methyl cellulose ether yipolymer engeyiyo i-ionic enokugcinwa kakuhle kwamanzi, kwaye ngaphakathi koluhlu oluthile, ubukhulu be-viscosity, ngcono ukugcinwa kwamanzi kunye nokucaca ngakumbi isiphumo sokuqina. Isizathu kukuba iqela le-hydroxyl kwikhonkco layo le-molecular kunye ne-athomu ye-oksijini kwi-ether bond ingenza i-hydrogen bond kunye ne-molecule zamanzi, okwenza amanzi akhululekile abe ngamanzi adibeneyo. Ngoko ke, kwidosi efanayo, i-HPMC6000 inokunyusa i-viscosity yodaka ngaphezu kwe-HPMC2000, inciphise ukumanzi kodaka, kwaye inyuse izinga lokugcinwa kwamanzi ngokucacileyo. I-Document 10 ichaza le nto ingasentla ngokwenza isisombululo se-viscoelastic emva kokuba i-cellulose ether ichithwe emanzini, kwaye ibonakalisa iimpawu zokuhamba ngokuguqulwa. Inokuthi ithathwe ukuba i-steel slag mortar elungiselelwe kweli phepha ine-fluidity enkulu, enokufikelela kwi-295mm ngaphandle kokuxuba, kwaye ukuguqulwa kwayo kukhulu. Xa i-cellulose ether yongezwa, i-slurry iya kuhamba ngokuhamba kwe-viscous, kwaye amandla ayo okubuyisela imilo encinci, ngoko kukhokelela ekunciphiseni ukuhamba.

2.2 Impembelelo ye-cellulose ether kumandla odaka lwesanti ye-slag

Ukongezwa kwe-cellulose ether akuchaphazeli kuphela ukusebenza komsebenzi we-steel slag sand mortar, kodwa kuchaphazela iimpawu zayo zomatshini.

Ukusuka kwimpembelelo yeedosi ezahlukeneyo ze-ether yeselulosi kumandla oxinzelelo lwentsimbi ye-slag udaka lwesanti, kunokubonwa ukuba emva kokongeza i-HPMC2000 kunye ne-HPMC6000, amandla acinezelayo odaka kwidosi nganye ayanda kunye nobudala. Ukongeza i-HPMC2000 ayinayo impembelelo ecacileyo kumandla oxinzelelo lweentsuku ezingama-28 zodaka, kwaye ukuguquguquka kwamandla akukhulu; ngelixa i-HPMC2000 inempembelelo enkulu ekuqaleni (ientsuku ezi-3 kunye neentsuku ezisi-7) amandla, ebonisa ukuthambekela kokuhla okucacileyo, nangona umthamo unyuka ukuya kwi-0.25% kwaye Ngaphezulu, amandla oxinzelelo lokuqala anyuke kancinci, kodwa angaphantsi kunoko ngaphandle ukongeza. Xa umxholo we-HPMC6000 ungaphantsi kwe-0.20%, impembelelo kwi-7-day kunye ne-28-day compressive force ayibonakali, kwaye amandla oxinzelelo lweentsuku ezi-3 ayancipha kancinci. Xa umxholo we-HPMC6000 unyuke ukuya kwi-0.25% nangaphezulu, amandla eentsuku ezingama-28 anyuke ukuya kumlinganiselo othile, aze ahla; amandla eentsuku ezi-7 ayancipha, kwaye emva koko ahlala eqinile; amandla eentsuku ezi-3 ancipha ngendlela ezinzileyo. Ngoko ke, kunokuqwalaselwa ukuba ii-ether ze-cellulose ezine-viscosities ezimbini ze-HPMC2000 kunye ne-HPMC6000 azinayo impembelelo ecacileyo yokuwohloka kwi-28-day compressive force of mortar, kodwa ukongezwa kwe-HPMC2000 kunesiphumo esibi esicacileyo ngakumbi kumandla okuqala odaka.

I-HPMC2000 inedigri ezahlukeneyo zokuwohloka kumandla e-flexural yodaka, kungakhathaliseki ukuba kwinqanaba lokuqala (iintsuku ezi-3 kunye neentsuku ezi-7) okanye kwisigaba sasemva (iintsuku ezingama-28). Ukongezwa kwe-HPMC6000 kwakhona kunomlinganiselo othile wempembelelo engalunganga kumandla oguquguqukayo odaka, kodwa iqondo lempembelelo lincinci kunelo le-HPMC2000.

Ukongeza kumsebenzi wokugcinwa kwamanzi kunye nokuqina, i-cellulose ether iphinda ilibazise inkqubo ye-hydration ye-samente. Ikakhulu ngenxa ye-adsorption ye-cellulose ether molecules kwiimveliso ze-cement hydration, ezifana ne-calcium silicate hydrate gel kunye ne-Ca (OH) i-2, ukwenza umaleko wokugubungela; ngaphezu koko, i-viscosity yesisombululo se-pore iyanda, kwaye i-cellulose ether ithintela Ukufuduka kwe-Ca2 + kunye ne-SO42- kwisisombululo se-pore kulibazisa inkqubo ye-hydration. Ngoko ke, amandla okuqala (iintsuku ezi-3 kunye neentsuku ze-7) zodaka oluxutywe ne-HPMC lwancitshiswa.

Ukongeza i-ether cellulose kudaka kuya kwenza inani elikhulu lamaqamza amakhulu kunye nobubanzi obuyi-0.5-3mm ngenxa yempembelelo yokungenisa umoya kwi-ether cellulose, kunye nesakhiwo se-cellulose ether inwebu sibhengezwa kumphezulu wala maqamza, ukuze a Umlinganiselo othile udlala indima ekuzinziseni amaqamza. indima, ngaloo ndlela yenza buthathaka umphumo we-defoamer kumdaka. Nangona amaqamza omoya abunjiweyo afana neebheringi zebhola kudaka olutsha oluxubeneyo, oluphucula ukusebenza, xa udaka luqinisiwe kwaye luqinisiwe, uninzi lwamaqamza omoya luhlala eludaka ukwenza iipores ezizimeleyo, ezinciphisa ukuxinana okubonakalayo kodaka. . Amandla oxinzelelo kunye namandla okuguquguquka ayancipha ngokufanelekileyo.

Kuyabonakala ukuba xa ulungiselela isanti slag isanti udaka olukhethekileyo kunye fluidity eliphezulu, izinga lokugcinwa kwamanzi aphezulu kunye namandla aphezulu, kuyacetyiswa ukuba usebenzise HPMC6000, kunye nethamo kufuneka ingabi ngaphezu kwe-0.20%.

ukuququmbela

Iimpembelelo ze-viscosities ezimbini ze-cellulose ethers (HPMC200 kunye ne-HPMC6000) ekugcinweni kwamanzi, i-fluidity, i-compressive kunye namandla aguquguqukayo e-steel slag udaka lwesanti yaphononongwa ngokusebenzisa imifuniselo, kunye nendlela yokusebenza ye-cellulose ether kwi-steel slag sand mortar yahlaziywa. Ezi zigqibo zilandelayo:

(1) Kungakhathaliseki ukuba yongeza i-HPMC2000 okanye i-HPMC6000, izinga lokugcinwa kwamanzi kwi-sand slag yentsimbi esanda kuxutywa udaka lunokuphuculwa kakhulu, kwaye ukusebenza kwayo kokugcinwa kwamanzi kunokuphuculwa.

(2) Xa umthamo ungaphantsi kwe-0.20%, umphumo wokongeza i-HPMC2000 kunye ne-HPMC6000 kwi-fluidity ye-slag yesanti yodaka ayibonakali. Xa umxholo unyuka ukuya kwi-0.25% nangaphezulu, i-HPMC2000 kunye ne-HPMC6000 inempembelelo ethile engalunganga kwi-fluidity ye-slag yesanti yodaka, kunye nefuthe elibi le-HPMC6000 libonakala ngakumbi.

(3) Ukongezwa kwe-HPMC2000 kunye ne-HPMC6000 ayinayo impembelelo ecacileyo kwi-28-day compressive force ye-steel slag sand mortar, kodwa i-HPMC2000 inefuthe elibi kakhulu kumandla obunzima bokuqala bodaka, kwaye amandla okuguquguquka nawo ngokucacileyo angathandeki. Ukongezwa kwe-HPMC6000 kunefuthe elithile elibi kwi-flexural flexural of steel slag-sand mortar kuyo yonke iminyaka, kodwa iqondo lesiphumo lisezantsi kakhulu kunolo lwe-HPMC2000.