I-Desulfurization gypsum yigesi yombane eveliswa ngokutshiswa kwamafutha anesalfure (amalahle, i-petroleum), inkunkuma eqinileyo yoshishino eveliswa ngexesha lenkqubo yokucoca i-desulfurization, kunye ne-hemihydrate gypsum (ifomula yeekhemikhali CaSO4 · 0.5H2O), ukusebenza kuthelekiswa naloo nto. yegypsum yokwakha yendalo.Ke ngoko, kukho uphando oluninzi kunye nokusetyenziswa kokusebenzisa i-gypsum desulfurized endaweni ye-gypsum yendalo ukuvelisa izixhobo zokuzilinganisa.Iingxube ze-polymer ze-Organic ezifana ne-agent yokunciphisa amanzi, i-arhente yokugcina amanzi kunye ne-retarder zizinto ezibalulekileyo ezisebenzayo ekubunjweni kwezinto zodaka ezizilinganisa.Unxibelelwano kunye nendlela yokubini kunye nezixhobo zesamente yimiba efanele ukuqwalaselwa.Ngenxa yeempawu zenkqubo yokwakheka, ukucoleka kwegypsum ye-desulfurized kuncinci (ubungakanani besuntswana ubukhulu becala busasazwa phakathi kwe-40 kunye ne-60 μm), kwaye ukuhla komgubo akukho ngqiqweni, ngoko ke iipropathi zerheological zegypsum desulfurized zihlwempuzekile, kunye nodaka. udaka olulungiselelwe ngalo luhlala lulula Ukwahlula, ukuhluma kunye nokopha kwenzeka.Cellulose ether yeyona admixture isetyenziswa ngokuqhelekileyo kudaka, kunye nokusetyenziswa kwayo ngokudibeneyo kunye ne-arhente yokunciphisa amanzi sisiqinisekiso esibalulekileyo sokuqaphela ukusebenza okubanzi kwezixhobo zokuzilinganisa ze-gypsum ezisekelwe kwi-desulfurized ezifana nokusebenza kokwakhiwa kunye nokusebenza komatshini kunye nokuqina.
Kweli phepha, ixabiso le-fluidity lisetyenziswa njengesalathiso solawulo (iqondo lokusabalalisa i-145 mm ± 5 mm), ligxininise kwimpembelelo yomxholo we-cellulose ether kunye nobunzima be-molecular (ixabiso le-viscosity) ekusetyenzisweni kwamanzi kwi-desulfurized gypsum-based self. -izixhobo zokulinganisa, ukulahlekelwa kwamanzi ngokuhamba kwexesha, kunye nokudibanisa Umthetho wempembelelo yeempawu ezisisiseko ezifana nexesha kunye neempawu zokuqala zoomatshini;kwangaxeshanye, vavanya umthetho wempembelelo ye-etere ye-cellulose ekukhululweni kobushushu kunye nesantya sokukhululwa kobushushu be-desulfurized gypsum hydration, hlalutya impembelelo yayo kwinkqubo yokufakwa kwamanzi kwi-gypsum desulfurized, kwaye ekuqaleni uxoxe ngolu hlobo lwe-admixture Ukuhambelana ne-desulfurization gypsum gelling system. .
1. Imathiriyeli ekrwada kunye neendlela zokuvavanya
1.1 Iimathiriyeli ekrwada
I-Gypsum powder: i-powder desulfurized gypsum eveliswa yinkampani yaseTangshan, i-mineral composition i-hemihydrate gypsum, ukubunjwa kwayo kweekhemikhali kuboniswe kwiThebhile 1, kwaye iimpawu zayo ezibonakalayo ziboniswa kwiThebhile 2.
umfanekiso
umfanekiso
I-Admixtures ibandakanya: i-cellulose ether (i-hydroxypropyl methylcellulose, i-HPMC emfutshane);superplasticizer WR;i-defoamer B-1;EVA redispersible latex powder S-05, zonke zifumaneka ngokurhweba.
Aggregate: Isanti yomlambo yendalo, isanti ecikizekileyo eyenziwe ngokwayo ehluzwe ngesisefu esiyi-0.6 mm.
1.2 Indlela yokuvavanya
I-gypsum elungisiweyo ye-desulfurization: isanti: amanzi = 1: 0.5: 0.45, isixa esifanelekileyo seminye imixube, i-fluidity njengesalathiso solawulo (ukwandiswa kwe-145 mm ± 5 mm), ngokulungelelanisa ukusetyenziswa kwamanzi, ngokulandelelana kuxutywe kunye nezinto ze-cementitious (desulfurization gypsum + Cement ) 0, 0.5 ‰, 1.0 ‰, 2.0 ‰, 3.0 ‰ cellulose ether (HPMC-20,000);lungisa ngakumbi idosi ye-cellulose ether ukuya ku-1‰, khetha i-HPMC-20,000, HPMC-40,000, HPMC-75,000, kunye ne-HPMC-100,000 hydroxypropyl methylcellulose ethers ezinobunzima beemolekyuli ezahlukeneyo (amanani ahambelanayo yi-H72, H4, H4, H4 ), ukufunda idosi kunye nobunzima bemolekyuli (ixabiso le-viscosity) ye-cellulose ether Impembelelo yotshintsho kwiipropati ze-gypsum-based self-leveling mortar, kunye nefuthe lezi zimbini kumanzi, ixesha lokubeka kunye neempawu zokuqala zoomatshini. umxube we-gypsum owenziwe nge-desulfurized self-leveling mortar kuyaxoxwa ngawo.Indlela ethile yokuvavanya iqhutywe ngokuhambelana neemfuno ze-GB / T 17669.3-1999 "Ukumiselwa kweePropati zeMechanical of Building Gypsum".
Ubushushu bovavanyo lwe-hydration lwenziwa kusetyenziswa isampuli engenanto ye-gypsum desulfurized kunye neesampuli ezinomxholo we-cellulose ether ye-0.5 ‰ kunye ne-3 ‰, ngokulandelanayo, kunye nesixhobo esisetyenzisiweyo luhlobo lwe-TA-AIR yobushushu bomhloli we-hydration.
2. Iziphumo kunye nohlalutyo
2.1 Impembelelo yesiqulatho se-cellulose ether kwiipropati ezisisiseko zodaka
Ngokunyuka komxholo, ukusebenza kunye nokudityaniswa kodaka kuphuculwe kakhulu, ukulahleka kolwelo ngokuhamba kwexesha kuncitshiswe kakhulu, kwaye umsebenzi wokwakha ugqwese kakhulu, kwaye udaka oluqinileyo alunanto i-delamination, kunye nokugudiswa komphezulu, ukuguda kunye neAesthetics ziphuculwe kakhulu.Kwangaxeshanye, ukusetyenziswa kwamanzi udaka ukuze kuphunyezwe fluidity efanayo kwanda kakhulu.Kwi-5 ‰, ukusetyenziswa kwamanzi kwanda nge-102%, kwaye ixesha lokugqibela lokumisela landiswa nge-100 min, eyayiyi-2.5 ngamaxesha esampuli engenanto.Iipropathi zangaphambili zomatshini wodaka zehla kakhulu ngokunyuka komxholo we-cellulose ether.Xa umxholo we-cellulose ether wawuyi-5 ‰, i-24 h amandla e-flexural kunye namandla oxinzelelo lwehla ukuya kwi-18.75% kunye ne-11.29% yesampuli engenanto ngokulandelanayo.Amandla oxinzelelo yi-39.47% kunye ne-23.45% yesampuli engenanto ngokulandelanayo.Kuyafaneleka ukuba uqaphele ukuba ngokunyuka kwenani le-arhente yokugcina amanzi, ubuninzi be-bulk of mortar buye yancipha kakhulu, ukusuka kwi-2069 kg / m3 kwi-0 ukuya kwi-1747 kg / m3 kwi-5 ‰, ukuhla kwe-15.56%.Ubuninzi bomdaka buyancipha kwaye i-porosity iyanda, enye yezizathu zokuhla okucacileyo kwiipropati zomatshini zodaka.
I-ether ye-cellulose yi-polymer engekho i-ionic.Amaqela e-hydroxyl kwi-cellulose ether chain kunye ne-athomu ye-oksijini kwi-ether bond inokudibanisa kunye neemolekyuli zamanzi ukwenza iibhondi ze-hydrogen, ukuguqula amanzi akhululekile kumanzi adibeneyo, ngaloo ndlela edlala indima yokugcina amanzi.I-Macroscopically Ibonakaliswa njengokwanda kokubambisana kwe-slurry [5].Ukunyuka kwe-slurry viscosity akuyi kwandisa kuphela ukusetyenziswa kwamanzi, kodwa kunye ne-ether ye-cellulose echithweyo iya kubhengezwa kumphezulu we-gypsum particles, ukuthintela ukusabela kwe-hydration kunye nokwandisa ixesha lokumisela;ngexesha lenkqubo yokuvuselela, inani elikhulu lamaqamza omoya liya kwaziswa kwakhona.I-Voids iya kubumba njengoko udaka luqina, ekugqibeleni lunciphisa amandla omdaka.Ngokucokisekileyo ukuqwalasela ukusetyenziswa kwamanzi unilateral umxube lodaka, ukusebenza ukwakhiwa, ixesha ukusetwa kunye neempawu mechanical, kunye nokuqina kamva, njl., umxholo cellulose ether kwi desulfurized gypsum-based self-leveling udaka akufanele idlule 1‰.
2.2 Isiphumo sobunzima bemolekyuli ye-cellulose ether ekusebenzeni kodaka
Ngokuqhelekileyo, ukuphakama kwe-viscosity kunye nokucoleka kokucoleka kwe-cellulose ether, ngcono ukugcinwa kwamanzi kunye nokwandisa amandla okudibanisa.ukusebenza kuya kuchaphazeleka kakubi.Ke ngoko, impembelelo ye-cellulose ethers yobunzima bemolekyuli ezahlukeneyo kwiipropathi ezisisiseko ze-gypsum-based self-leveling mortar materials yavavanywa ngakumbi.Imfuno yamanzi yodaka inyuke ukuya kumlinganiselo othile, kodwa ayizange ibe nempembelelo ecacileyo kwixesha lokumisela kunye nolwelo.Kwangaxeshanye, amandla okuguquguquka kunye nokunyanzeliswa kodaka kumazwe ahlukeneyo abonisa ukuhla, kodwa ukuhla kwakungaphantsi kakhulu kunempembelelo yomxholo we-cellulose ether kwiipropati zomatshini.Isishwankathelo, ukwanda kobunzima bemolekyuli ye-cellulose ether ayinayo impembelelo ecacileyo ekusebenzeni kwemixube yodaka.Ukuqwalasela ukulungelelaniswa kolwakhiwo, i-viscosity ephantsi kunye ne-ether encinci ye-molecular-weight cellulose kufuneka ikhethwe njenge-desulfurized gypsum-based self-leveling materials.
2.3 Impembelelo ye-cellulose ether kubushushu be-hydration yegypsum enesulfurized
Ngokunyuka komxholo we-cellulose ether, incopho ye-exothermic ye-hydration ye-gypsum ye-desulfurized yehla ngokuthe ngcembe, kwaye ixesha lokuma kwe-peak liye lalibaziseka kancinane, ngelixa ukushisa kwe-exothermic ye-hydration kuncipha, kodwa kungabonakali.Oku kubonisa ukuba i-cellulose ether inokulibazisa izinga le-hydration kunye ne-hydration degree ye-gypsum desulfurized ukuya kwinqanaba elithile, ngoko ke idosi akufanele ibe nkulu kakhulu, kwaye kufuneka ilawulwe ngaphakathi kwe-1 ‰.Ingabonwa ukuba ifilimu ye-colloidal eyenziwe emva kokuba i-ether ye-cellulose idibana namanzi i-adsorbed phezu kwamasuntswana e-gypsum e-desulfurized, okunciphisa izinga lokuhamba kwe-gypsum ngaphambi kwe-2 h.Kwangaxeshanye, ugcino lwamanzi awodwa kunye neziphumo ezityebileyo zilibazisa ukuphuphuma kwamanzi oludaka kunye ne-Disipation kunenzuzo kwi-hydration eyongezelelweyo ye-gypsum ye-desulfurized kwisigaba samva.Ukushwankathela, xa idosi efanelekileyo ilawulwa, i-cellulose ether inefuthe elilinganiselweyo kwireyithi ye-hydration kunye ne-hydration degree ye-gypsum desulfurized ngokwayo.Ngexesha elifanayo, ukwanda komxholo we-cellulose ether kunye nobunzima be-molecular kuya kwandisa kakhulu i-viscosity ye-slurry kwaye ibonise ukusebenza kakuhle kokugcinwa kwamanzi.Ukuze kuqinisekiswe umbane we-gypsum self-leveling mortar, ukusetyenziswa kwamanzi kuya kunyuka kakhulu, okubangelwa ixesha elide lokubeka i-mortar.Esona sizathu siphambili sokuhla kweempawu zoomatshini.
3. Isiphelo
(1) Xa i-fluidity isetyenziswa njengesalathiso solawulo, kunye nokunyuka komxholo we-cellulose ether, ixesha lokubeka i-desulfurized gypsum-based self-leveling mortar lide kakhulu, kwaye iimpawu zomatshini ziyancipha kakhulu;xa kuthelekiswa nomxholo, ubunzima bemolekyuli ye-cellulose ether Ukunyuka kunempembelelo encinci kwiipropati ezingentla zodaka.Ukuqwalasela ngokubanzi, i-cellulose ether kufuneka ikhethwe nge-molecular weight encinci (ixabiso le-viscosity elingaphantsi kwe-20 000 Pa·s), kwaye i-dosage kufuneka ilawulwe ngaphakathi kwe-1 ‰ yezinto ze-cementitious.
(2) Iziphumo zovavanyo lobushushu be-hydration ye-gypsum ye-desulfurized zibonisa ukuba ngaphakathi kolu vavanyo, i-cellulose ether inefuthe elilinganiselweyo kwireyithi ye-hydration kunye nenkqubo ye-hydration ye-gypsum desulfurized.Ukunyuka kokusetyenziswa kwamanzi kunye nokuncipha kobuninzi bobuninzi zezona zizathu zokuhla kweempawu zomatshini we-desulfurized gypsum-based mortar.
Ixesha lokuposa: May-08-2023