Desulfurization gypsum ke khase ea flue e hlahisoang ke ho chesoa ha mafura a nang le sebabole (mashala, peterole), litšila tse tiileng tsa indasteri tse hlahisoang nakong ea ts'ebetso ea tlhoekiso ea desulfurization, le hemihydrate gypsum (lik'hemik'hale tsa mokhoa oa CaSO4 · 0.5H2O), ts'ebetso e bapisoa le seo. ea gypsum ea moaho oa tlhaho.Ka hona, ho na le lipatlisiso le lits'ebetso tse ntseng li eketseha tsa ho sebelisa gypsum desulfurized ho e-na le gypsum ea tlhaho ho hlahisa lisebelisoa tsa ho ikemela.Metsoako ea polymer ea tlhaho joalo ka e fokotsang metsi, e bolokang metsi le retarder ke likarolo tsa bohlokoa tse sebetsang molemong oa lisebelisoa tsa seretse tse ikemelang.Tšebelisano le mochine oa bobeli ka thepa ea samente ke litaba tse lokelang ho hlokomeloa.Ka lebaka la litšoaneleho tsa ts'ebetso ea sebopeho, botle ba gypsum ea desulfurized bo nyane (boholo ba karoloana bo ajoa haholo pakeng tsa 40 le 60 μm), 'me phokotso ea phofo ha e utloahale, ka hona, thepa ea rheological ea gypsum e senyehileng e fokola, le seretse. slurry e lokisitsoeng ke eona hangata ho bonolo Ho arohana, stratification le ho tsoa mali ho etsahala.Cellulose ether ke motsoako o sebelisoang ka ho fetisisa ka seretse, 'me tšebeliso ea eona e kopantsoeng le moemeli oa ho fokotsa metsi ke tiisetso ea bohlokoa ea ho hlokomela ts'ebetso e pharaletseng ea lisebelisoa tsa ho ikemela tsa gypsum tse kang ts'ebetso ea kaho le ts'ebetso ea morao-rao ea mochine le ho tšoarella.
Pampiri ena, boleng ba fluidity bo sebelisoa e le index ea taolo (ho hasana tekanyo ea 145 mm ± 5 mm), e lebisang tlhokomelo ho phello ea litaba tsa cellulose ether le boima ba molek'hule (boleng ba viscosity) ho sebelisoa ha metsi a desulfurized gypsum-based self. -Lisebelisoa tsa boemo, ho lahleheloa ke metsi ka nako, le ho kopanya Molao oa tšusumetso ea thepa ea motheo e kang nako le thepa ea pele ea mochine;Ka nako e ts'oanang, leka molao oa tšusumetso ea selulose ether ka ho lokolloa ha mocheso le tekanyo ea ho lokolloa ha mocheso oa desulfurized gypsum hydration, ho hlahloba tšusumetso ea eona ho ts'ebetso ea hydration ea gypsum desulfurized, 'me qalong buisana ka mofuta ona oa motsoako oa ho lumellana le tsamaiso ea desulfurization gypsum gelling. .
1. Lisebelisoa tse tala le mekhoa ea teko
1.1 Lisebelisoa tse tala
Gypsum powder: phofo ea gypsum e entsoeng ka desulfurized e hlahisoang ke k'hamphani ea Tangshan, motsoako o ka sehloohong oa liminerale ke hemihydrate gypsum, lik'hemik'hale tsa eona li bontšoa ho Lethathamo la 1, 'me thepa ea eona ea' mele e bontšoa ho Lethathamo la 2.
setšoantšo
setšoantšo
Li-admixtures li kenyelletsa: cellulose ether (hydroxypropyl methylcellulose, HPMC ka nako e khutšoanyane);superplasticizer WR;defoamer B-1;EVA redispersible latex powder S-05, kaofela ha eona e fumaneha khoebong.
Aggregate: lehlabathe la tlhaho la noka, lehlabathe le entsoeng ka bohona le hloekisitsoeng ka sefe ea 0.6 mm.
1.2 Mokhoa oa teko
Fixed desulfurization gypsum: lehlabathe: metsi = 1: 0.5: 0.45, palo e loketseng ea admixtures tse ling, fluidity e le index taolo (katoloso 145 limilimithara ± 5 limilimithara), ka ho lokisa tshebediso ya metsi, ka ho latellana tsoakane le thepa cementitious (desulfurization gypsum + Samente ) 0, 0.5 ‰, 1.0 ‰, 2.0 ‰, 3.0 ‰ cellulose ether (HPMC-20,000);ka ho eketsehileng lokisa lethal dose ea selulose ether ho 1‰, khetha HPMC-20,000, HPMC-40,000 , HPMC-75,000, le HPMC-100,000 hydroxypropyl methylcellulose ethers le boima ba limolek'hule tse sa tšoaneng (nomoro e tsamaellanang ke H70, H4 ka ho latellana, H4, H4, H7, H4, H4, H2, H4, H4, H4, H4, H4, H4, H4, H4, H7, H4, H7, H4, H4, H7, H4, H4, H4, H2, H4, H4, H4, H7, H4, H4, H4, H2, H4, H4, H7, H4, H4, H7, H4, H4, H4, H4, H2, H4, H4, H4. ), ho ithuta litekanyetso le boima ba limolek'hule (boleng ba viscosity) ea cellulose ether Tšusumetso ea liphetoho ho thepa ea seretse sa gypsum-based self-leveling, le tšusumetso ea tse peli ho metsi, ho beha nako le thepa ea pele ea mochine. ho buisanoa ka motsoako oa seretse sa gypsum o senyehileng o itšebetsang.Mokhoa o ikhethileng oa tlhahlobo o etsoa ho latela litlhoko tsa GB/T 17669.3-1999 "Qeto ea Mechanical Properties of Building Gypsum".
Mocheso oa tlhahlobo ea hydration o etsoa ho sebelisoa sampuli e se nang letho ea gypsum ea desulfurized le disampole tse nang le selulose ether content ea 0.5 ‰ le 3 ‰, ka ho latellana, 'me sesebelisoa se sebelisoang ke mocheso oa mofuta oa TA-AIR oa hydration tester.
2. Liphetho le tlhahlobo
2.1 Phello ea litaba tsa cellulose ether ho thepa ea motheo ea seretse
Ka keketseho ea litaba, ts'ebetso le momahano oa seretse li ntlafatsoa haholo, tahlehelo ea metsi ka nako e fokotsehile haholo, 'me ts'ebetso ea kaho e ntle haholo,' me seretse se thata ha se na ketsahalo ea delamination, le boreleli ba bokaholimo, boreleli le Aesthetics li ntlafalitsoe haholo.Ka nako e ts'oanang, tšebeliso ea metsi ea seretse ho finyella mokelikeli o tšoanang o ile oa eketseha haholo.Ka 5 ‰, tšebeliso ea metsi e ile ea eketseha ka 102%, 'me nako ea ho qetela ea ho beha e ile ea lelefatsoa ka metsotso e 100, e neng e le makhetlo a 2,5 a sampuli e se nang letho.Thepa ea pele ea mochini ea seretse e fokotsehile haholo ka keketseho ea litaba tsa cellulose ether.Ha litaba tsa cellulose ether e ne e le 5‰, matla a 24 h flexural le matla a ho hatella a fokotsehile ho 18.75% le 11.29% ea sampuli e se nang letho ka ho latellana.Matla a hatellang ke 39.47% le 23.45% ea sampole e se nang letho ka ho latellana.Ke habohlokoa ho hlokomela hore ka keketseho ea palo ea moemeli oa ho boloka metsi, bongata bo bongata ba seretse le bona bo fokotsehile haholo, ho tloha ho 2069 kg / m3 ho 0 ho 1747 kg / m3 ho 5 ‰, ho fokotseha ha 15,56%.Boima ba seretse bo fokotseha 'me porosity e eketseha, e leng e' ngoe ea mabaka a ho fokotseha ho totobetseng ha thepa ea mechine ea seretse.
Cellulose ether ke polymer e seng ea ionic.Lihlopha tsa hydroxyl holim'a ketane ea ether ea cellulose le liathomo tsa oksijene holim'a tlamo ea ether li ka kopana le limolek'hule tsa metsi ho etsa li-bond tsa haedrojene, ho fetola metsi a mahala hore e be metsi a tlamiloeng, kahoo a bapala karolo ea ho boloka metsi.Macroscopically E bonahala e le ho eketseha ha momahano oa slurry [5].Keketseho ea slurry viscosity e ke ke ea eketsa tšebeliso ea metsi feela, empa hape le ether ea selulose e qhibilihisitsoeng e tla ba adsorbed holim'a likaroloana tsa gypsum, e sitisa ho itšoara ha metsi le ho lelefatsa nako ea ho beha;nakong ea ts'ebetso e susumetsang, palo e kholo ea li-bubble tsa moea le eona e tla hlahisoa.Voids e tla theha ha seretse se thatafala, qetellong se fokotsa matla a seretse.Ka ho pharaletseng ho nahanoa ka tšebeliso ea metsi a le mong a motsoako oa seretse, ts'ebetso ea kaho, ho beha nako le thepa ea mechine, 'me hamorao ho tšoarella, joalo-joalo, litaba tsa cellulose ether ka desulfurized gypsum-based self-leveling seretse se se ke sa feta 1‰.
2.2 Phello ea boima ba molek'hule ea cellulose ether ho sebetsa ha seretse
Hangata, ha viscosity e phahame le botle bo botle ba cellulose ether, ho boloka metsi ho molemo le ho eketsa matla a ho kopanya.tshebetso e tla ameha hampe.Ka hona, tšusumetso ea li-cellulose ethers tsa litekanyo tse fapaneng tsa limolek'hule mefuteng ea mantlha ea lisebelisoa tsa seretse sa gypsum-based self-leveling li ile tsa lekoa hape.Tlhokahalo ea metsi ea seretse e ile ea eketseha ho isa bohōleng bo itseng, empa e ne e se na phello e totobetseng nakong ea ho beha nako le mokelikeli.Ka nako e ts'oanang, matla a flexural le a hatellang a seretse linaheng tse fapaneng a ile a bontša mokhoa oa ho theoha, empa ho theoha ho ne ho le tlase haholo ho feta tšusumetso ea selulose ether e nang le thepa ea mochine.Ka kakaretso, ho eketseha ha boima ba limolek'hule tsa cellulose ether ha ho na phello e hlakileng ts'ebetsong ea metsoako ea seretse.Ha ho nahanoa ka boiketlo ba kaho, li-viscosity tse tlaase le li-cellulose ether tse nyenyane tse boima ba limolek'hule li lokela ho khethoa e le lisebelisoa tse ikemetseng tsa gypsum-based self-leveling.
2.3 Phello ea cellulose ether mochesong oa hydration ea desulfurized gypsum
Ka keketseho ea litaba tsa cellulose ether, tlhōrō ea exothermic ea hydration ea desulfurized gypsum e ile ea fokotseha butle-butle, 'me nako ea boemo ba tlhōrō e ile ea lieha hanyenyane, ha mocheso o matla oa hydration o fokotsehile, empa ha ho hlakile.Sena se bontša hore cellulose ether e ka liehisa sekhahla sa hydration le hydration degree ea desulfurized gypsum ho isa bohōleng bo itseng, kahoo litekanyetso ha lia lokela ho ba tse kholo haholo, 'me li lokela ho laoloa ka hare ho 1 ‰.Ho ka bonoa hore filimi ea colloidal e entsoeng ka mor'a hore selulose ether e kopane le metsi e adsorbed holim'a likaroloana tsa gypsum desulfurized, e leng ho fokotsa sekhahla sa hydration ea gypsum pele ho lihora tse peli.Ka nako e ts'oanang, ts'ebetso ea eona e ikhethang ea ho boloka metsi le litlamorao tse teteaneng li liehisa ho fetoha mouoane ha metsi a seretse 'me Dissipation e na le molemo ho hydration e eketsehileng ea desulfurized gypsum hamorao.Ho akaretsa, ha tekanyo e nepahetseng e laoloa, cellulose ether e na le tšusumetso e fokolang ho sekhahla sa hydration le tekanyo ea hydration ea desulfurized gypsum ka boeona.Ka nako e ts'oanang, ho eketseha ha cellulose ether content le boima ba molek'hule ho tla eketsa haholo viscosity ea slurry le ho bontša ts'ebetso e babatsehang ea ho boloka metsi.E le ho etsa bonnete ba hore metsi a seretse sa desulfurized gypsum self-leveling, tšebeliso ea metsi e tla eketseha haholo, e leng ka lebaka la nako e telele ea ho beha seretse.Lebaka le ka sehloohong la ho fokotseha ha thepa ea mechine.
3. Qetello
(1) Ha fluidity e sebelisoa e le index ea taolo, ka keketseho ea selulose ether content, nako ea ho beha desulfurized gypsum-based self-leveling seretse se lelefalitsoe haholo, 'me thepa ea mochine e fokotsehile haholo;ha e bapisoa le dikahare, boima ba molek'hule ea cellulose ether Keketseho e na le phello e fokolang ho thepa e ka holimo ea seretse.Ha ho nahanoa ka botlalo, ether ea cellulose e lokela ho khethoa ka boima ba limolek'hule tse nyane (boleng ba viscosity bo ka tlase ho 20 000 Pa·s), 'me tekanyo e lokela ho laoloa ka hare ho 1‰ ea thepa ea samente.
(2) Liphetho tsa liteko tsa mocheso oa hydration oa gypsum ea desulfurized li bontša hore ka har'a sebaka sa tlhahlobo ena, cellulose ether e na le tšusumetso e fokolang ho sekhahla sa hydration le ts'ebetso ea hydration ea gypsum desulfurized.Keketseho ea tšebeliso ea metsi le ho fokotseha ha bongata ba bongata ke mabaka a ka sehloohong a ho fokotseha ha thepa ea mochini oa seretse se entsoeng ka gypsum se entsoeng ka desulfurized.
Nako ea poso: May-08-2023