Desulfurization gypsum ndiyo gasi reflue rinogadzirwa nekupiswa kwemafuta ane sarufa (marasha, peturu), tsvina yakasimba yeindasitiri inogadzirwa panguva yekuchenesa desulfurization, uye hemihydrate gypsum (kemikari formula CaSO4 · 0.5H2O), kuita kwakafanana neicho. zvechisikigo kuvaka gypsum. Naizvozvo, kune kwakawanda uye kwakawanda kutsvagisa uye mashandisiro ekushandisa desulfurized gypsum pachinzvimbo cheyakasikwa gypsum kugadzira ega-leveling zvinhu. Organic polymer admixtures senge mvura inodzikisa mumiriri, inochengetedza mvura mumiriri uye retarder zvinhu zvakakosha zvinoshanda mukuumbwa kwezvigadziriso zvedhaka. Kudyidzana uye michina yezviviri zvine simende zvinhu inyaya dzakafanira kutariswa imwe. Nekuda kwehunhu hwemaitiro ekuumbwa, kunaka kwegypsum desulfurized idiki (iyo saizi yechikamu inonyanya kugoverwa pakati pe40 ne60 μm), uye iyo poda gradation haina musoro, saka iyo rheological properties yedesulfurized gypsum haina kunaka, uye dhaka. slurry yakagadzirwa nayo inowanzova nyore Kuparadzanisa, stratification uye kubuda ropa kunoitika. Cellulose ether ndiyo inonyanya kushandiswa musanganiswa mudhaka, uye kushandiswa kwayo kwakasanganiswa nemvura yekudzikisa mvura ivimbiso yakakosha yekuona kushanda kwakazara kwedesulfurized gypsum-based self-leveling zvinhu zvakadai sekuita kwekuvaka uye gare gare mechanical uye durability performance.
Mubepa rino, kukosha kwemvura kunoshandiswa sengedzo indekisi (inopararira dhigirii 145 mm ± 5 mm), ichitarisa kukanganiswa kwezviri mukati me cellulose ether uye molecular uremu (viscosity value) pakushandiswa kwemvura yedesulfurized gypsum-based self. -leveling zvinhu, kurasikirwa kwemvura nekufamba kwenguva, uye coagulation Mutemo wepesvedzero yezvinhu zvakakosha senge nguva uye yekutanga michina zvinhu; panguva imwe chete, edzai mutemo wekupesvedzera cellulose ether pakuburitswa kwekupisa uye kupisa kuburitsa mwero we desulfurized gypsum hydration, ongorora maitiro ayo pa hydration process ye desulfurized gypsum, uye tanga kurukurai rudzi urwu rwekusanganiswa Kuenderana ne desulfurization gypsum gelling system. .
1. Raw zvinhu uye nzira dzekuyedza
1.1 Raw zvinhu
Gypsum powder: desulfurized gypsum powder inogadzirwa nekambani muTangshan, iyo huru yemaminerari yakagadzirwa ndeye hemihydrate gypsum, makemikari ayo anoratidzwa muTafura 1, uye maitiro ayo emuviri anoratidzwa muTebhu 2.
mufananidzo
mufananidzo
Admixtures inosanganisira: cellulose ether (hydroxypropyl methylcellulose, HPMC kwenguva pfupi); superplasticizer WR; defoamer B-1; EVA redispersible latex poda S-05, ese ari ekutengesa.
Aggregate: jecha remurwizi rwechisikigo, jecha rakazvigadzira rakacheneswa nesefa ye 0.6 mm.
1.2 Nzira yekuedza
Fixed desulfurization gypsum: jecha: mvura = 1: 0.5: 0.45, chiyero chakakodzera chezvimwe zvakasanganiswa, fluidity sekutonga index (kuwedzera 145 mm ± 5 mm), nekugadzirisa kushandiswa kwemvura, zvakasanganiswa nezvinhu zvecementitious (desulfurization gypsum + Cement). ) 0, 0.5 ‰, 1.0 ‰, 2.0 ‰, 3.0 ‰ cellulose ether (HPMC-20,000); wedzera kugadzirisa chipimo che cellulose ether kusvika 1‰, sarudza HPMC-20,000, HPMC-40,000 , HPMC-75,000, uye HPMC-100,000 hydroxypropyl methylcellulose ethers ane huremu hwakasiyana-siyana (nhamba dzinoenderana neH70, H4 zvakateerana, H4 ), kudzidza dosage uye molecular uremu (viscosity value) ye cellulose ether Mhedzisiro yekuchinja kwezvinhu zvegypsum-based self-leveling mortar, uye pesvedzero yezviviri pane fluidity, kuseta nguva uye yekutanga michina zvimiro zvedesulfurized gypsum inodzika-leveling dhaka. musanganiswa unokurukurwa. Iyo chaiyo yekuyedza nzira inoitwa zvinoenderana nezvinodiwa zveGB/T 17669.3-1999 "Kusarudza Mechanical Properties yeKuvaka Gypsum".
Kupisa kwekuedzwa kwe hydration kunoitwa uchishandisa sampuli isina chinhu ye desulfurized gypsum uye samples ine cellulose ether ye 0.5 ‰ uye 3 ‰, zvichiteerana, uye chiridzwa chinoshandiswa ndeye TA-AIR yemhando yekupisa ye hydration tester.
2. Migumisiro uye kuongorora
2.1 Mhedzisiro ye cellulose ether yemukati pane yakakosha zvimiro zvedhaka
Nekuwedzera kwezviri mukati, kushanda uye kubatana kwedhaka kunovandudzwa zvakanyanya, kurasikirwa kwemvura nekufamba kwenguva kunoderedzwa zvakanyanya, uye basa rekuvaka rinonyanya kunaka, uye dhaka rakaomeswa harina delamination phenomenon, uye kutsetseka kwepamusoro, kutsetseka uye Aesthetics yakagadziridzwa zvakanyanya. Panguva imwecheteyo, kushandiswa kwemvura kwedhaka kuti iwane mvura yakafanana yakawedzera zvakanyanya. Pa5 ‰, kushandiswa kwemvura kwakawedzera ne102%, uye nguva yekupedzisira yekuisa yakawedzerwa ne100 min, iyo yaiva 2.5 nguva yemuenzaniso usina chinhu. Iyo yekutanga mechanical properties yematope yakaderera zvakanyanya nekuwedzera kwehuwandu hwe cellulose ether. Apo zvinyorwa zve cellulose ether zvaive 5 ‰, iyo 24 h flexural simba uye kudzvinyirira simba rakaderera kusvika 18.75% uye 11.29% yemuenzaniso usina chinhu maererano. Iyo yekumanikidza simba ndeye 39.47% uye 23.45% yemuenzaniso usina chinhu zvichiteerana. Zvakakosha kuziva kuti nekuwedzera kwehuwandu hwemvura inochengetedza mumiriri, kuwanda kwedhaka kwakadererawo zvakanyanya, kubva pa 2069 kg / m3 pa 0 kusvika 1747 kg / m3 pa 5 ‰, kuderera kwe15.56%. Kuwanda kwedhaka kunoderera uye porosity inowedzera, ndicho chimwe chezvikonzero zvekuderera kuri pachena mumagetsi emagetsi edhaka.
Cellulose ether isiri-ionic polymer. Mapoka ehydroxyl ari pa cellulose ether cheni uye maatomu eokisijeni ari paether bond anogona kusangana nemamorekuru emvura kuita mabhondi ehydrogen, achishandura mvura yemahara kuita mvura yakasungwa, zvichibva zvaita basa rekuchengetedza mvura. Macroscopically Iyo inoratidzwa sekuwedzera kwekubatana kwe slurry [5]. Kuwedzera kwe slurry viscosity hakuzongowedzera kushandiswa kwemvura, asiwo yakanyungudutswa cellulose ether ichave yakashambadzirwa pamusoro pe gypsum particles, ichidzivisa hydration reaction uye kuwedzera nguva yekuisa; panguva yekukurudzira, nhamba huru yemhepo inoputika ichaiswawo. Voids ichaumba sezvo dhaka rinoomesa, pakupedzisira kuderedza simba redhaka. Kunyatsofunga nezve unilateral mvura kushandiswa kwedhaka musanganiswa, basa rekuvaka, kuisa nguva uye michina zvinhu, uye gare gare kusimba, nezvimwewo, zviri mukati cellulose ether mu desulfurized gypsum-based self-leveling mortar haifaniri kudarika 1 ‰.
2.2 Mhedzisiro yehuremu hwemamorekuru e cellulose ether pakuita kwedhaka
Kazhinji, iyo yakakwira viscosity uye nekunaka kweiyo cellulose ether, zviri nani kuchengetedza mvura uye kuwedzera kusimba kwekubatana. kushanda kuchakanganiswa. Naizvozvo, pesvedzero ye cellulose ethers yeakasiyana mamorekuru uremu pane ekutanga zvimiro zvegypsum-based self-leveling mortar zvinhu zvakayedzwa zvakare. Kudiwa kwemvura kwedhaka kwakawedzera kune imwe nhanho, asi yakanga isina mhedzisiro yakajeka pane yekumisikidza nguva uye fluidity. Panguva imwecheteyo, kusimba uye kusimba kwedhaka munzvimbo dzakasiyana kwakaratidza kuderera, asi kuderera kwacho kwaive kushoma zvakanyanya pane pesvedzero ye cellulose ether yezvinhu pane zvemakanika. Muchidimbu, kuwedzera kwehuremu hwema molecular ether cellulose haina mhedzisiro iri pachena pakuita kwemusanganiswa wedhaka. Tichifunga nezvekureruka kwekuvaka, yakaderera-viscosity uye diki-molecular-uremu cellulose ether inofanira kusarudzwa se desulfurized gypsum-based self-leveling zvinhu.
2.3 Mhedzisiro ye cellulose ether pakupisa kwe hydration ye desulfurized gypsum
Nekuwedzera kwemukati we cellulose ether, iyo exothermic peak ye hydration ye desulfurized gypsum yakadzikira zvishoma nezvishoma, uye nguva yenzvimbo yepamusoro yakanonoka zvishoma, nepo kupisa kwakanyanya kwe hydration kwakadzikira, asi kwete pachena. Izvi zvinoratidza kuti cellulose ether inogona kunonoka hydration rate uye hydration dhigirii ye desulfurized gypsum kune imwe nhanho, saka muyero haufanire kunge wakakura, uye unofanirwa kudzorwa mukati me1 ‰. Zvinogona kuonekwa kuti iyo colloidal firimu yakaumbwa mushure mokunge cellulose ether inosangana nemvura inoshambadzirwa pamusoro pe desulfurized gypsum particles, iyo inoderedza hydration rate yegypsum isati yasvika 2 h. Panguva imwecheteyo, kuchengetedza kwayo kwakasiyana kwemvura uye kukora mhedzisiro kunonoka kubuda kwemvura ine slurry uye Dissipation inobatsira kune imwe hydration yedesulfurized gypsum mune inotevera nhanho. Kupfupisa, kana dosi rakakodzera radzorwa, cellulose ether ine simba shoma pane hydration rate uye hydration degree yedesulfurized gypsum pachayo. Panguva imwecheteyo, kuwedzera kwe cellulose ether content uye molecular uremu kuchawedzera zvakanyanya viscosity ye slurry uye kuratidza yakanakisa kuchengetedza mvura kuita. Kuti uve nechokwadi chekuyerera kweiyo desulfurized gypsum self-leveling mortar, kushandiswa kwemvura kuchawedzera zvakanyanya, izvo zvinokonzerwa nekurebesa nguva yekugadzika kwedhaka. Chikonzero chikuru chekuderera kwema mechanical properties.
3. Mhedziso
(1) Kana fluidity inoshandiswa sechiratidzo chekutonga, nekuwedzera kwe cellulose ether content, nguva yekuisa desulfurized gypsum-based self-leveling mortar inonyanya kurebeswa, uye michina yemagetsi inoderedzwa zvakanyanya; zvichienzaniswa nezviri mukati, molecular huremu hwe cellulose ether Kuwedzera kune zvishoma zvazvinoita pane zviri pamusoro pezvinhu zvedhaka. Tichifunga zvakazara, cellulose ether inofanira kusarudzwa nediki molecule uremu (viscosity value yakaderera kupfuura 20 000 Pa · s), uye chiyero chinofanira kudzorwa mukati me1 ‰ ye cementitious material.
(2) Mhedzisiro yemhedzisiro yekupisa kweiyo desulfurized gypsum inoratidza kuti mukati mechikamu chebvunzo iyi, cellulose ether ine simba shoma pachiyero che hydration uye hydration process ye desulfurized gypsum. Kuwedzera kwekushandiswa kwemvura uye kuderera kwehuwandu hwehuwandu ndizvo zvikonzero zvikuru zvekudzikira kwemakanika zvinhu zvedesulfurized gypsum-based mortar.
Nguva yekutumira: Chivabvu-08-2023