Gypsum yekubvisa sulfurization imhepo inobuda mugomba inogadzirwa nekupisa mafuta ane sarufa (marasha, peturu), marara emumaindasitiri anogadzirwa panguva yekucheneswa kwe desulfurization, uye hemihydrate gypsum (makemikari formula CaSO4· 0.5H2O), mashandiro acho akafanana neegypsum yekuvaka yechisikigo. Nokudaro, kune tsvakurudzo dzakawanda uye mashandisirwo ekushandisa gypsum yakabviswa sulfur panzvimbo pegypsum yechisikigo kugadzira zvinhu zvinozvienzanisa. Organic polymer admixtures dzakadai semvura inodzikisa, mvura inochengetedza uye retarder zvinhu zvakakosha zvinoshanda mukuumbwa kwezvinhu zvinozvienzanisa. Kudyidzana uye mashandiro ezviri zviviri nezvinhu zvinosimbisa zvinhu zvinhu zvinhu zvinofanirwa kutariswa. Nekuda kwehunhu hwemaitiro ekuumbwa, kupfava kwegypsum yakabviswa sulfur kudiki (hukuru hwezvimedu hunonyanya kugoverwa pakati pe40 ne60 μm), uye kugadzwa kweupfu hakuna musoro, saka hunhu hwe rheological hwe gypsum yakabviswa sulfur hwakaderera, uye slurry inogadzirwa nayo inowanzo kuve nyore. Kuparadzanisa, kupatsanura uye kubuda ropa kunoitika. Cellulose ether ndiyo inonyanya kushandiswa mudura, uye kushandiswa kwayo pamwe chete nemushonga wekuderedza mvura ivimbiso yakakosha yekuzadzisa kushanda kwakakwana kwezvinhu zve gypsum-based self-leveling zvakaita sekushanda kwekuvaka uye kushanda kwekugadzira nekugadzira nekugara kwenguva refu.
Mupepa rino, kukosha kwekuyerera kunoshandiswa sechiratidzo chekudzora (dhigirii rekupararira 145 mm±5 mm), tichitarisa pamhedzisiro yezviri mu cellulose ether uye huremu hwemamorekuru (kukosha kwekusimba) pakushandiswa kwemvura kwezvinhu zve gypsum-based desulfurized self-leveling, kurasikirwa kwekuyerera kwemvura nekufamba kwenguva, uye kuungana kwemvura. Mutemo wesimba rezvinhu zvepakutanga zvakaita senguva uye zvekutanga zvemakanika; panguva imwe chete, edza mutemo wesimba re cellulose ether pakusunungurwa kwekupisa uye mwero wekusunungurwa kwekupisa kwe desulfurized gypsum hydration, ongorora simba rayo pakushanda kwe hydration ye desulfurized gypsum, uye kutanga kurukura nezverudzi urwu rwe admixture. Kuenderana ne desulfurization gypsum gelling system.
1. Zvishandiso uye nzira dzekuyedza
1.1 Zvinhu zvisina kugadzirwa
Upfu hweGypsum: upfu hwegypsum hwakabviswa sulfuri hunogadzirwa nekambani iri muTangshan, musanganiswa mukuru wezvicherwa ihemihydrate gypsum, musanganiswa wayo wemakemikari unoratidzwa muTafura 1, uye hunhu hwayo hwepanyama hunoratidzwa muTafura 2.
mufananidzo
mufananidzo
Zvimwe zvinhu zvinosanganisira: cellulose ether (hydroxypropyl methylcellulose, HPMC muchidimbu); superplasticizer WR; defoamer B-1; EVA redispersible latex powder S-05, zvese izvi zvinowanikwa muzvitoro.
Aggregate: jecha remurwizi rechisikigo, jecha rakanaka rakagadzirwa nemaoko rakaseferwa nemusefa we 0.6 mm.
1.2 Nzira yekuyedza
Gypsum yakagadziriswa yekubvisa sulfurization: jecha: mvura = 1:0.5:0.45, huwandu hwakakodzera hwezvimwe zvinhu zvakasanganiswa, kuyerera kwemvura sechiratidzo chekudzora (kuwedzera 145 mm ± 5 mm), nekugadzirisa kushandiswa kwemvura, zvichiteerana zvakasanganiswa nezvinhu zvesimende (gypsum yekubvisa sulfurization + Simende) 0, 0.5‰, 1.0‰, 2.0‰, 3.0‰ cellulose ether (HPMC-20,000); Wedzerai gadziriso ye ether ye cellulose ku 1‰, sarudzai HPMC-20,000, HPMC-40,000, HPMC-75,000, uye HPMC-100,000 hydroxypropyl methylcellulose ethers dzine huremu hwakasiyana hwemamorekuru (nhamba dzinoenderana ndiH2, H4, H7.5, uye H10 zvichiteerana), kuti mudzidze chiyero uye huremu hwemamorekuru (viscosity value) ye ether ye cellulose. Kuchinja kwehunhu hwe gypsum-based self-leveling mortar, uye pesvedzero yezviviri pakuyerera, nguva yekuisa uye hunhu hwekutanga hwe mechanical hwe desulfurized gypsum self-leveling mortar musanganiswa zvinokurukurwa. Nzira chaiyo yekuyedza inoitwa zvichienderana nezvinodiwa zveGB/T 17669.3-1999 "Kusarudzwa kwehunhu hweMechanical yeKuvaka Gypsum".
Kuyedzwa kwekupisa kwemvura kunoitwa uchishandisa sampuli isina chinhu yegypsum yakabviswa sulfur uye sampuli dzine cellulose ether ye0.5‰ ne3‰, zvichiteerana, uye chishandiso chinoshandiswa i TA-AIR type heat of hydration tester.
2. Mhedzisiro neongororo
2.1 Mhedzisiro yehuwandu hwe cellulose ether pahunhu hwepakutanga hwedhaka
Nekuwedzera kwezviri mukati, kushanda uye kubatana kwesimbi kunovandudzwa zvakanyanya, kurasikirwa kwemvura nekufamba kwenguva kunoderedzwa zvakanyanya, uye mashandiro ekuvaka anowedzera kunaka, uye simbi yakaoma haina chinhu chekubvisa dhayamita, uye kutsetseka kwepamusoro, kutsetseka uye Runako zvakavandudzwa zvikuru. Panguva imwe chete, kushandiswa kwemvura kwesimbi kuti isvike pakuyerera kwakafanana kwakawedzera zvakanyanya. Pa5‰, kushandiswa kwemvura kwakawedzera ne102%, uye nguva yekupedzisira yekuisa yakawedzerwa ne100 min, iyo yaive ka2.5 pane yesampuli isina chinhu. Hunhu hwekutanga hwesimbi yesimbi hwakaderera zvakanyanya nekuwedzera kwezviri mukati me cellulose ether. Kana zviri mukati me cellulose ether zvaive 5‰, simba re flexural uye simba rekumanikidza remaawa makumi maviri nemana zvakaderera kusvika 18.75% uye 11.29% yesampuli isina chinhu zvichiteerana. Simba rekumanikidza i39.47% uye 23.45% yesampuli isina chinhu zvichiteerana. Zvakakosha kuziva kuti nekuwedzera kwehuwandu hwechinhu chinochengetedza mvura, huwandu hwesimbi dzakadzikirawo zvakanyanya, kubva pa2069 kg/m3 pa0 kusvika 1747 kg/m3 pa5‰, kudzikira kwe15.56%. Kuwanda kwesimbi dzakadzikira uye porosity inowedzera, inova imwe yezvikonzero zvekudzikira kuri pachena kwehunhu hwesimbi dzakadzikira.
Cellulose ether ipolymer isiri ionic. Mapoka ehydroxyl ari pa cellulose ether chain nemaatomu eokisijeni ari pa ether bond anogona kusangana nemamorekuru emvura kuti agadzire hydrogen bonds, zvichishandura mvura yakasununguka kuita mvura yakasungwa, nokudaro zvichiita basa mukuchengetedza mvura. Macroscopically Inoratidzwa sekuwedzera kwekubatana kwe slurry [5]. Kuwedzera kwe slurry viscosity hakuzongowedzera kushandiswa kwemvura chete, asiwo cellulose ether yakanyungudutswa ichanyungudutswa pamusoro pe gypsum particles, zvichikanganisa hydration reaction uye kuwedzera nguva yekugadzika; panguva yekukurunga, huwandu hwakawanda hwemabubble emhepo huchaiswawo. Ma voids achaumbwa sezvo mortar ichioma, pakupedzisira zvichideredza simba remortar. Tichifunga zvakakwana nezvekushandiswa kwemvura kwemortar unilateral, mashandiro ekuvaka, nguva yekugadzika uye hunhu hwemakanika, uye kugara kwenguva refu, nezvimwewo, zviri mu cellulose ether mumortar yakabviswa gypsum haifanirwe kudarika 1‰.
2.2 Mhedzisiro yehuremu hwemamorekuru e cellulose ether pakushanda kwedhaka
Kazhinji, kana viscosity yakakwira uye kupfava kwe cellulose ether, kuchengetedza mvura kuri nani uye kuwedzera simba rekubatanidza. Kushanda kwayo kuchakanganiswa zvakanyanya. Nokudaro, simba re cellulose ethers dzemamorekuru akasiyana pahuremu hwekutanga hwe gypsum-based self-leveling mortar materials rakaedzwa zvakare. Kudiwa kwemvura kwemortar kwakawedzera kusvika pamwero wakati, asi hakuna mhedzisiro yakajeka panguva yekuiswa uye kuyerera. Panguva imwe chete, simba re flexural uye compressive remortar mumamiriro akasiyana rakaratidza kudzikira, asi kudzikira kwacho kwaive kushoma pane simba re cellulose ether pahunhu hwe mechanical. Mukupfupisa, kuwedzera kwehuremu hwe molecular ye cellulose ether hakuna mhedzisiro yakajeka pakushanda kwe mortar mixes. Tichifunga nezvekureruka kwekuvaka, low-viscosity uye small-molecular-weight cellulose ether inofanira kusarudzwa se desulfurized gypsum-based self-leveling materials.
2.3 Mhedzisiro ye cellulose ether pakupisa kwemvura yegypsum yakabviswa sulfuri
Nekuwedzera kwehuwandu hwe cellulose ether, huwandu hwemvura inoyerera mu exothermic ye desulfurized gypsum hwakaderera zvishoma nezvishoma, uye nguva yenzvimbo yepamusoro yakanonoka zvishoma, nepo kupisa kwe exothermic kwe hydration kwakadzikira, asi kwete pachena. Izvi zvinoratidza kuti cellulose ether inogona kunonoka huwandu hwemvura inoyerera uye huwandu hwemvura inoyerera mu desulfurized gypsum kusvika pamwero wakati, saka chiyero hachifanirwe kunge chakakura zvakanyanya, uye chinofanira kudzorwa mukati me 1‰. Zvinogona kuonekwa kuti colloidal film yakagadzirwa mushure mekunge cellulose ether yasangana nemvura inonyungudutswa pamusoro pe desulfurized gypsum particles, izvo zvinoderedza huwandu hwemvura inoyerera mu gypsum maawa maviri asati asvika. Panguva imwe chete, kuchengetedza kwayo mvura uye mhedzisiro yayo yekukora kunononoka kubuda kwemvura inoyerera uye Dissipation inobatsira kuwedzera hydration ye desulfurized gypsum muchikamu chekupedzisira. Muchidimbu, kana chiyero chakakodzera chikadzorwa, cellulose ether ine simba shoma pahuwandu hwemvura inoyerera uye huwandu hwemvura inoyerera mu desulfurized gypsum pachayo. Panguva imwe chete, kuwedzera kwehuwandu hwe cellulose ether uye huremu hwemamorekuru zvichawedzera zvakanyanya viscosity yeslurry uye kuratidza kushanda kwakanaka kwekuchengetedza mvura. Kuti ive nechokwadi chekuti gypsum gypsum self-leveling mortar inoyerera, kushandiswa kwemvura kuchawedzera zvakanyanya, izvo zvinokonzerwa nenguva yakareba yekuisa mortar. Chikonzero chikuru chekuderera kwehunhu hwemakanika.
3. Mhedziso
(1) Kana fluidity ikashandiswa se control index, nekuwedzera kwe cellulose ether content, nguva yekugadzika ye desulfurized gypsum-based self-leveling mortar inowedzera zvakanyanya, uye hunhu hwe mechanical hunoderedzwa zvakanyanya; zvichienzaniswa nezviri mukati, molecular weight ye cellulose ether Kuwedzera kwacho hakuna zvakunokanganisa pahunhu hwe mortar hwataurwa pamusoro apa. Tichifunga zvakakwana, cellulose ether inofanira kusarudzwa ine diki molecular weight (viscosity value yakaderera pane 20 000 Pa·s), uye dosage inofanira kudzorwa mukati me1‰ yezvinhu zvinosimbisa.
(2) Mhedzisiro yebvunzo yekupisa kwemvura kubva mu gypsum yakabviswa sulfuri inoratidza kuti mukati mebvunzo iyi, cellulose ether ine simba shoma pahuwandu hwemvura uye maitiro emvura kubva mu gypsum yakabviswa sulfuri. Kuwedzera kwekushandiswa kwemvura uye kudzikira kwehuwandu hwemvura ndizvo zvikonzero zvikuru zvekudzikira kwehunhu hwemakanika e gypsum yakabviswa sulfuri.
Nguva yekutumira: Chivabvu-08-2023