I-Desulfurization gypsum iyigesi ephumayo ekhiqizwa ukushiswa kwamafutha anesibabule (amalahle, i-petroleum), imfucumfucu eqinile yezimboni ekhiqizwa ngesikhathi sokuhlanzwa kwe-desulfurization, kanye ne-hemihydrate gypsum (ifomula yamakhemikhali CaSO4 · 0.5H2O), ukusebenza kuqhathaniswa nalokho. ye-gypsum yokwakha yemvelo.Ngakho-ke, luyanda ucwaningo kanye nezicelo zokusebenzisa i-gypsum desulfurized esikhundleni se-gypsum yemvelo ukukhiqiza izinto zokuzilinganisa.Ingxube ye-polymer ye-Organic efana ne-ejenti yokunciphisa amanzi, i-ejenti yokugcina amanzi kanye ne-retarder yizici ezibalulekile zokusebenza ekwakhiweni kwezinto zodaka ezizilinganisa.Ukusebenzisana kanye nendlela yakho kokubili ngezinto zikasimende yizindaba ezifanele ukunakwa.Ngenxa yezimpawu zenqubo yokubunjwa, ukucoleka kwe-gypsum e-desulfurized kuncane (usayizi wezinhlayiyana usakazwa kakhulu phakathi kuka-40 no-60 μm), futhi ukuhlukaniswa kwempushana akunangqondo, ngakho izakhiwo ze-rheological ze-gypsum desulfurized zimpofu, kanye nodaka. udaka olulungiselelwe yilo kuvame ukuba lula Ukuhlukaniswa, ukuhlukaniswa kanye nokopha kwenzeka.I-Cellulose ether iyingxube evame ukusetshenziswa kakhulu odakeni, futhi ukusetshenziswa kwayo okuhlangene ne-ejenti yokunciphisa amanzi kuyisiqinisekiso esibalulekile sokubona ukusebenza okuphelele kwezinto zokuzilinganisa ezenziwe nge-gypsum ezenziwe nge-desulfurized ezifana nokusebenza kokwakha kanye nokusebenza komshini nokuqina.
Kuleli phepha, inani le-fluidity lisetshenziswa njengenkomba yokulawula (idigri yokusabalalisa engu-145 mm±5 mm), igxile emthelela wokuqukethwe kwe-cellulose ether nesisindo se-molecular (value ye-viscosity) ekusetshenzisweni kwamanzi kwe-desulfurized gypsum-based self. -izinto zokuleveling, ukulahleka koketshezi ngokuhamba kwesikhathi, kanye nokuhlangana Umthetho wethonya lezakhiwo eziyisisekelo njengesikhathi kanye nezakhiwo zakuqala zemishini;ngesikhathi esifanayo, hlola umthetho wethonya le-cellulose ether ekukhululweni kokushisa kanye nezinga lokukhululwa kokushisa kwe-gypsum hydration ye-desulfurized, hlaziya ithonya layo kwinqubo ye-hydration ye-gypsum desulfurized, futhi ekuqaleni nixoxe ngalolu hlobo lwe-admixture Ukuhambisana ne-desulfurization gypsum gelling system. .
1. Izinto ezisetshenziswayo kanye nezindlela zokuhlola
1.1 Izinto ezisetshenziswayo
I-Gypsum powder: i-gypsum powder eyenziwe yi-desulfurized gypsum ekhiqizwa yinkampani e-Tangshan, ukwakheka kwamaminerali okuyinhloko yi-hemihydrate gypsum, ukwakheka kwayo kwamakhemikhali kuboniswa kuThebula 1, futhi izakhiwo zayo ezibonakalayo ziboniswa kuThebula lesi-2.
isithombe
isithombe
Izixube zihlanganisa: i-cellulose ether (i-hydroxypropyl methylcellulose, i-HPMC okwesikhashana);i-superplasticizer WR;i-defoamer B-1;I-EVA redispersible latex powder S-05, yonke etholakala ngokuthengisa.
Ukuhlanganisa: isihlabathi somfula esingokwemvelo, isihlabathi esicolekile esizenzelayo esihlungwe ngesisefo esingu-0.6 mm.
1.2 Indlela yokuhlola
I-gypsum ye-desulfurization engaguquki: isihlabathi: amanzi = 1: 0.5: 0.45, inani elifanele lezinye izingxube, uketshezi njengenkomba yokulawula (ukunwetshwa kwe-145 mm ± 5 mm), ngokulungisa ukusetshenziswa kwamanzi, ngokulandelana okuxutshwe nezinto zikasimende (i-desulfurization gypsum + Cement ) 0, 0.5 ‰, 1.0 ‰, 2.0 ‰, 3.0 ‰ cellulose ether (HPMC-20,000);qhubeka ulungise umthamo we-cellulose ether ukuya ku-1‰, khetha i-HPMC-20,000, HPMC-40,000 , HPMC-75,000, kanye ne-HPMC-100,000 hydroxypropyl methylcellulose ethers anesisindo samangqamuzana ahlukene (izinombolo ezihambisanayo ziyi-H70, H4 ngokulandelanayo, i-H4 ), ukufunda umthamo nesisindo samangqamuzana (i-viscosity value) ye-cellulose ether Umthelela wezinguquko ezakhiweni zodaka lokuzilinganisa olusekelwe ku-gypsum, kanye nomthelela wako kokubili ku-fluidity, isikhathi sokusetha kanye nezakhiwo zakuqala zemishini ingxube ye-gypsum self-leveling mortar kuyaxoxwa ngayo.Indlela ethile yokuhlola yenziwa ngokuhambisana nezidingo ze-GB/T 17669.3-1999 “Ukunqunywa Kwezakhiwo Zemishini Yokwakha I-Gypsum”.
Ukushisa kokuhlolwa kwe-hydration kwenziwa kusetshenziswa isampula elingenalutho le-gypsum desulfurized kanye namasampula ane-cellulose ether okuqukethwe kwe-0.5 ‰ no-3 ‰, ngokulandelana, futhi ithuluzi elisetshenziswayo uhlobo lokushisa lwe-TA-AIR lomhloli we-hydration.
2. Imiphumela kanye nokuhlaziya
2.1 Umthelela wokuqukethwe kwe-cellulose ether kuzakhiwo eziyisisekelo zodaka
Ngokukhula kokuqukethwe, ukusebenza nokubumbana kodaka kuthuthukiswa kakhulu, ukulahlekelwa kwe-fluidity ngokuhamba kwesikhathi kuncishiswa kakhulu, futhi ukusebenza kokwakha kuhle kakhulu, futhi udaka oluqinile alunayo into ye-delamination, kanye nokushelela kwendawo, ubushelelezi kanye ne-Aesthetics ithuthukiswe kakhulu.Ngesikhathi esifanayo, ukusetshenziswa kwamanzi kodaka ukuze kuzuzwe uketshezi olufanayo kwanda kakhulu.Ngo-5 ‰, ukusetshenziswa kwamanzi kukhuphuke ngo-102%, futhi isikhathi sokugcina sokusetha sandiswa ngamaminithi angu-100, okwakuyizikhathi ezingu-2.5 zesampula elingenalutho.Izakhiwo zokuqala zemishini yodaka zehla kakhulu ngokwanda kokuqukethwe kwe-cellulose ether.Lapho okuqukethwe kwe-cellulose ether kungu-5 ‰, amandla e-flexural angu-24 h namandla okucindezela ancipha afika ku-18.75% kanye no-11.29% wesampula engenalutho ngokulandelanayo.Amandla acindezelayo angama-39.47% kanye no-23.45% wesampula engenalutho ngokulandelanayo.Kuyaphawuleka ukuthi ngokunyuka kwenani le-ejenti yokugcina amanzi, ukuminyana kwenqwaba yodaka nakho kwehle kakhulu, kusuka ku-2069 kg/m3 ku-0 kuya ku-1747 kg/m3 ku-5 ‰, ukwehla kwe-15.56%.Ubuningi bodaka buyancipha futhi i-porosity iyanda, okungenye yezizathu zokuncipha okusobala kwezakhiwo zemishini zodaka.
I-Cellulose ether iyi-polymer engeyona i-ionic.Amaqembu e-hydroxyl ochungechungeni lwe-cellulose ether kanye nama-athomu omoya-mpilo kubhondi ye-ether angahlangana nama-molecule wamanzi akhe amabhondi e-hydrogen, aphendule amanzi amahhala abe amanzi abophekile, ngaleyo ndlela adlale indima ekugcineni amanzi.Ngokwe-Macroscopically Kubonakaliswa njengokwanda kokuhlangana kwe-slurry [5].Ukwanda kwe-slurry viscosity ngeke nje kwandise ukusetshenziswa kwamanzi, kodwa futhi i-cellulose ether encibilikisiwe izokhangiswa ebusweni bezinhlayiya ze-gypsum, ivimbela ukusabela kwe-hydration nokwandisa isikhathi sokusetha;phakathi nenqubo yokunyakazisa, kuzokwethulwa inani elikhulu lamabhamuza omoya.Ama-voids azokwakheka njengoba udaka luqina, ekugcineni lunciphise amandla odaka.Ngokuphelele ucabangela ukusetshenziswa kwamanzi okuhlangene okuhlangene kwengxube yodaka, ukusebenza kokwakhiwa, ukubeka isikhathi kanye nezakhiwo zemishini, kanye nokuqina kamuva, njll., okuqukethwe kwe-cellulose ether ku-desulfurized gypsum-based self-leveling mortar akufanele kudlule i-1 ‰.
2.2 Umthelela wesisindo semolekyuli ye-cellulose ether ekusebenzeni kodaka
Ngokuvamile, ukuphakama kwe-viscosity kanye nokucoleka kwe-cellulose ether, kuba ngcono ukugcinwa kwamanzi futhi kwandise amandla okubopha.ukusebenza kuzothinteka kabi.Ngakho-ke, umthelela wama-cellulose ethers ezisindo zamangqamuzana ahlukene ezimpahleni eziyisisekelo zezinto ezisekelwe ku-gypsum zokuzilinganisa zaphinde zahlolwa.Isidingo samanzi sikadaka senyuke safinyelela ezingeni elithile, kodwa sasingenawo umthelela osobala ngesikhathi sokumiswa kanye noketshezi.Ngesikhathi esifanayo, amandla odaka aguquguqukayo nacindezelayo ezifundeni ezihlukene abonisa inkambiso eyehlayo, kodwa ukwehla kwakungaphansi kakhulu komthelela wokuqukethwe kwe-cellulose ether kuzakhiwo zemishini.Kafushane, ukwanda kwesisindo samangqamuzana e-cellulose ether akunawo umthelela osobala ekusebenzeni kwezingxube zodaka.Uma kucatshangelwa ukunethezeka kokwakhiwa, i-low-viscosity kanye ne-cellulose ether encane ye-molecular-weight kufanele kukhethwe njengezinto zokuzilinganisa ezisekelwe kwi-gypsum.
2.3 Umthelela we-cellulose ether ekushiseni kwe-hydration ye-gypsum desulfurized
Ngokukhula kokuqukethwe kwe-cellulose ether, ukuphakama kwe-exothermic ye-hydration ye-gypsum e-desulfurized yehla kancane kancane, futhi isikhathi sendawo ephakeme sabambezeleka kancane, kuyilapho ukushisa okushisayo kwe-hydration kwehla, kodwa hhayi ngokusobala.Lokhu kubonisa ukuthi i-cellulose ether ingabambezela izinga le-hydration kanye ne-hydration degree ye-gypsum desulfurized ngokwezinga elithile, ngakho-ke umthamo akufanele ube mkhulu kakhulu, futhi kufanele ulawulwe ngaphakathi kwe-1 ‰.Kungabonakala ukuthi ifilimu ye-colloidal eyakhiwe ngemva kokuba i-cellulose ether ihlangana namanzi iyakhangiswa ebusweni bezinhlayiya ze-gypsum e-desulfurized, okunciphisa izinga lokugeleza kwe-gypsum ngaphambi kwamahora angu-2.Ngasikhathi sinye, ukugcinwa kwamanzi kwawo okuyingqayizivele kanye nemiphumela yokujiya kubambezela ukuhwamuka kwamanzi anodaka kanye ne-Disipation kunenzuzo ekuqhubekeleni phambili kwe-hydration ye-desulfurized gypsum esigabeni sakamuva.Ukufingqa, lapho kulawulwa umthamo ofanele, i-cellulose ether inethonya elilinganiselwe kuzinga lokugeleza kwamanzi kanye ne-hydration degree ye-gypsum desulfurized ngokwayo.Ngesikhathi esifanayo, ukwanda kokuqukethwe kwe-cellulose ether kanye nesisindo samangqamuzana kuzokwandisa kakhulu i-viscosity ye-slurry futhi kubonise ukusebenza okuhle kakhulu kokugcinwa kwamanzi.Ukuze kuqinisekiswe ukuthi i-fluidity ye-desulfurized gypsum self-leveling mortar, ukusetshenziswa kwamanzi kuzokwanda kakhulu, okubangelwa isikhathi eside sokusetha sodaka.Isizathu esiyinhloko sokwehla kwezakhiwo zemishini.
3. Isiphetho
(1) Uma i-fluidity isetshenziswa njengenkomba yokulawula, ngokwanda kokuqukethwe kwe-cellulose ether, isikhathi sokusetha se-desulfurized gypsum-based self-leveling mortar siyandiswa kakhulu, futhi izakhiwo zemishini ziyancipha kakhulu;uma kuqhathaniswa nokuqukethwe, isisindo samangqamuzana e-cellulose ether Ukwanda kunomphumela omncane kuzakhiwo ezingenhla zodaka.Uma kucatshangelwa kabanzi, i-cellulose ether kufanele ikhethwe ngesisindo esincane samangqamuzana (inani le-viscosity elingaphansi kuka-20 000 Pa·s), futhi umthamo kufanele ulawulwe ngaphakathi kwe-1 ‰ yezinto ezisimende.
(2) Imiphumela yokuhlolwa yokushisa kwe-hydration ye-gypsum desulfurized ibonisa ukuthi ngaphakathi kobubanzi balokhu kuhlolwa, i-cellulose ether inethonya elilinganiselwe kuzinga lokugeleza kwamanzi kanye nenqubo yokufakwa kwe-hydration ye-gypsum desulfurized.Ukwenyuka kokusetshenziswa kwamanzi kanye nokuncipha kokuminyana kwenqwaba yizizathu eziyinhloko zokuncipha kwezakhiwo zemishini zodaka olususelwe ku-gypsum.
Isikhathi sokuthumela: May-08-2023