Zvivakwa zvegypsum mortar

Kufuridzirwa kwe cellulose ether yemukati pakuchengetedza mvura kwedesulfurized gypsum mortar yakaongororwa nenzira nhatu dzekuyedza dzekuchengetedza mvura yegypsum mortar, uye mhedzisiro yebvunzo yakaenzaniswa nekuongororwa. Mhedzisiro ye cellulose ether yemukati pakuchengetedza mvura, kumanikidza simba, flexural simba uye bond simba regypsum mortar rakadzidzwa. Zvigumisiro zvinoratidza kuti kuiswa kwe cellulose ether kunoderedza simba rekumanikidzika regypsum mortar, kuvandudza zvakanyanya kuchengetwa kwemvura uye kusimba kwekubatanidza, asi kune zvishoma zvinokanganisa simba reflexural.

Mazwi akakosha:kuchengetedza mvura; cellulose ether; gypsum dhaka

Cellulose ether imvura inonyungudika yepolymer zvinhu, iyo inogadziriswa kubva kune yakasikwa cellulose kuburikidza nealkali dissolution, grafting reaction (etherification), kugeza, kuomesa, kugaya uye mamwe maitiro. Cellulose ether inogona kushandiswa sechinhu chekuchengetedza mvura, thickener, binder, dispersant, stabilizer, suspending agent, emulsifier uye firimu-forming aid, etc. Nokuti cellulose ether ine mvura yakanaka yekuchengetedza uye kukora pamatope, inogona kuvandudza zvakanyanya kushanda. yedhaka, saka cellulose ether ndiyo inonyanya kushandiswa mumvura-soluble polymer mudhaka. Cellulose ether inowanzoshandiswa sechinhu chinochengetedza mvura mu (desulfurization) gypsum mortar. Makore ekutsvakurudza kwakaratidza kuti muchengeti wekuchengetedza mvura ane simba rinokosha zvikuru pahutano hwepurasita uye kushanda kwekudzivirira-plastering layer. Kuchengetwa kwemvura kwakanaka kunogona kuve nechokwadi chekuti plaster yakazara Hydrates, inovimbisa simba rinodiwa, inovandudza rheological properties ye stucco plaster. Nokudaro, zvakakosha zvikuru kuyera zvakakodzera kuchengetedza mvura kwegypsum. Nechikonzero ichi, munyori akafananidza nzira mbiri dzakajairwa dzekuchengetedza mvura yedhaka kuti ave nechokwadi chechokwadi chemhedzisiro yeselulosi ether pakuchengetedza mvura kuita kwegypsum, uye kuongorora michina ye cellulose ether pane gypsum mortar. The pesvedzero ye, akaedzwa experimentally.

1. Muedzo

1.1 Raw zvinhu

Desulfurization gypsum: The flue gas desulfurization gypsum yeShanghai Shidongkou No. 2 Power Plant inowanikwa nekuomesa pa60.°C uye calcining pa180°C. Cellulose ether: methyl hydroxypropyl cellulose ether yakapihwa neKima Chemical Company, ine viscosity ye20000mPa·S; jecha ijecha riri pakati nepakati.

1.2 Nzira yekuedza

1.2.1 Nzira yekuedza yehuwandu hwekuchengetedza mvura

(1) Vacuum suction nzira (“Plastering Gypsum” GB/T28627-2012) Cheka chidimbu chemapepa epakati-kumhanya kwesefa kubva mukati medhayamita yeBuchner funnel, woriparadzira pazasi peBuchner funnel, woinyika nayo. mvura. Isa Buchner funnel pane suction filter bhodhoro, tanga vacuum pombi, sefa ye1 min, bvisa iyo Buchner funnel, pukuta mvura yakasara pazasi nesefa bepa uye uremu (G1), yakarurama kusvika 0.1g. Isa iyo gypsum slurry ine yakajairwa diffusion dhigirii uye kushandiswa kwemvura mune yakayerwa Buchner funnel, uye shandisa T-shaped scraper kutenderera yakatwasuka mufunnel kuti ibude, kuitira kuti ukobvu hweslurry huchengetedzwe mukati meiyo (10).±0.5)mm . Dzima yasara gypsum slurry pamadziro emukati meBuchner funnel, huremu (G2), yakarurama kusvika 0.1g. Nguva yenguva kubva pakupera kwekukurudzira kusvika pakupera kwekuyera haifaniri kunge yakakura kudarika 5min. Isa yakayereswa Buchner fani pane sefa furasiki uye tanga vacuum pombi. Gadzirisa kumanikidza kwakashata ku (53.33±0.67) kPa kana (400±5) mm Hg mukati memasekondi makumi matatu. Suction filtration kwemaminitsi makumi maviri, wobva wabvisa Buchner funnel, pukuta mvura yakasara mumuromo wezasi nesefa bepa, huremu (G3), yakarurama kusvika 0.1g.

(2) Sefa nzira yekunyudza mvura yebepa (1) (Chiyero cheFrench) Rongedza slurry yakasanganiswa pamapepa akati wandei emapepa. Mhando dzemapepa ekusefa anoshandiswa ndeaya: (a) 1 layer yefast-filtering sefa bepa rinosangana zvakananga neslurry; (b) Matunhu mashanu epepa resefa kuitira kunonoka kusefa. Plastic round plate inoshanda sepallet, uye inogara yakananga patafura. Bvisa huremu hwepurasitiki disc uye sefa bepa rekunonoka kusefa (misa ndeye M0). Mushure mekunge purasita yeParis yakasanganiswa nemvura kuti iite slurry, inodururwa pakarepo muhumburumbira (mukati dhayamita 56mm, kureba 55mm) yakafukidzwa nepepa resefa. Mushure mekunge slurry yasangana nebepa resefa kwemaminitsi gumi nemashanu, re-yera zvakare inononoka-yakasefa pepa uye pallet (mass M1). Kuchengetwa kwemvura kwepurasita kunoratidzwa nehuremu hwemvura inotorwa pa square centimita yekunyura nzvimbo yekusingaperi sefa bepa, kureva: kunyura kwemvura kwesefa bepa = (M1-M0)/24.63

(3) Sefa nzira yekunyudza mvura yebepa (2) ("Mitemo yemaitiro ekutanga maitiro ekuyedza nzira dzekuvaka dhaka" JGJ/T70) Weresa huremu m1 yepepa risingapindike uye yakaoma bvunzo mold uye huwandu m2 hwezvikamu gumi neshanu zvepakati. -speed qualitative filter paper. Zadza musanganiswa wedhaka muforoma yekuyedza panguva imwe chete, woisa woipuruzira kakawanda ne spatula. Kana iyo dhaka yekuzadza yakakwira zvishoma kupfuura kumucheto kwemuyedzo mold, shandisa spatula kukwenya kubva yakawandisa dhaka pamusoro peyedzo mold pakona ye450 degrees, uye wozoshandisa spatula kukwenya dhaka rakafuratira. pamusoro peyedzo mold pakona yakati sandarara. Dzima dhaka pamucheto webvunzo mold, uye uremu huremu hwese m3 yebvunzo mold, yepasi isingapindike sheet uye dhaka. Vhara pamusoro pedhaka nesefa sikirini, isa zvidimbu gumi neshanu zvemapepa esefa pamusoro pesefa skrini, vhara pamusoro pebepa resefa neshizha risingapindiki, wodzvanya pepa risingapindiki rine huremu hwe2kg. Mushure mekumira kwemaminitsi maviri, bvisa zvinhu zvinorema uye mashizha asingapindiki, tora pepa resefa (kunze kwesefa yekrini), uye nekukurumidza kuyera pepa resefa yakawanda m4. Verenga hunyoro hwemudhaka kubva pachiyero chedhaka uye huwandu hwemvura yakawedzerwa.

1.2.2 Nzira dzekuyedza dzesimba rekumanikidza, simba rekuchinjika uye simba rebhondi

Gypsum dhaka compressive simba, flexural simba, bond simba bvunzo uye zvinoenderana bvunzo mamiriro anoitwa zvinoenderana oparesheni nhanho mu "Plastering Gypsum" GB/T 28627-2012.

2. Migumisiro yekuedza uye kuongorora

2.1 Mhedzisiro ye cellulose ether pakuchengetedza mvura kwedhaka - kuenzanisa nzira dzakasiyana dzekuyedza

Kuti uenzanise misiyano yemhando dzakasiyana dzekuyedza kuchengetedza mvura, nzira nhatu dzakasiyana dzakaedzwa kune imwecheteyo fomula yegypsum.

Kubva pakuenzanisa mhedzisiro yenzira nhatu dzakasiyana, zvinogona kuoneka kuti kana huwandu hwemvura inochengetedza hunowedzera kubva pa0 kusvika 0.1%, mhedzisiro yebvunzo uchishandisa sefa yepepa yekunyudza mvura nzira (1) inodonha kubva pa150.0mg/cm.² kusvika ku8.1mg/cm² , yakaderera ne94,6%; mwero wekuchengetedza mvura yedhaka yakayerwa nesefa yepepa yekunyudza mvura nzira (2) yakawedzera kubva pa95.9% kusvika 99.9%, uye mwero wekuchengetedza mvura wakangowedzera ne4%; mhedzisiro yebvunzo yevacuum suction nzira yakawedzera ne69% .8% yakawedzera kusvika 96.0%, chiyero chekuchengetedza mvura chakawedzera ne37.5%.

Zvinogona kuonekwa kubva pane izvi kuti chiyero chekuchengetwa kwemvura chakayerwa nesefa bepa remvura yekunyudza nzira (2) haigone kuvhura mutsauko mukuita uye kuyerwa kweiyo mvura inochengetedza mumiriri, iyo isingaenderane neiyo chaiyo bvunzo uye kutonga kweiyo. mvura yekuchengetedza chiyero chegypsum commercial mortar, uye vacuum filtration method imhaka yekuti Ikoko kunomanikidzirwa kusveta, saka musiyano we data unogona kuvhurwa nechisimba kuratidza mutsauko mukuchengetedza mvura. Panguva imwecheteyo, mhinduro dzebvunzo uchishandisa iyo sefa mapepa ekunyudza mvura nzira (1) inochinja zvakanyanya nehuwandu hwekuchengetedza mvura, iyo inogona kuwedzera zvirinani mutsauko pakati pehuwandu hwemvura inochengetedza mumiriri uye akasiyana. Nekudaro, sezvo mwero wekunyudzwa kwemvura webepa resefa yakayerwa nenzira iyi huwandu hwemvura inotorwa nesefa bepa pane imwe unit nzvimbo, apo manwiro emvura eiyo standard diffusivity yedhaka inosiyana nerudzi, dosi uye viscosity ye mvura-yekuchengetedza mumiriri yakasanganiswa, mhinduro dzebvunzo haigone kunyatsoratidza kuchengetwa kwemvura kwechokwadi kwedhaka. Rate.

Kupfupisa, iyo vacuum suction nzira inogona kunyatso kusiyanisa yakanakisa kuchengetedza kwemvura kuita kwedhaka, uye haina kukanganiswa nekushandiswa kwemvura kwedhaka. Kunyangwe mhedzisiro yekuyedzwa kwesefa bepa remvura yekunyudza nzira (1) inokanganiswa nekushandiswa kwemvura kwedhaka, nekuda kwematanho akareruka ekuyedza ekuita, mashandiro ekuchengetedza mvura edhaka anogona kuenzaniswa pasi peiyo fomula imwechete.

Reshiyo yeyakagadziriswa gypsum composite cementitious zvinhu kusvika pakati jecha i1:2.5. Gadzirisa huwandu hwemvura nekushandura huwandu hwe cellulose ether. Kufuridzirwa kwezvinyorwa zve cellulose ether pamvura yekuchengetedza mvura yegypsum mortar yakadzidzwa. Kubva pamigumisiro yekuedza, zvinogona kuonekwa kuti nekuwedzera kwezvinyorwa zve cellulose ether, kuchengetwa kwemvura kwedhaka kunovandudzwa zvikuru; apo zvinyorwa zve cellulose ether zvinosvika 0% yehuwandu hwehuwandu hwedhaka.Panenge pa10%, iyo mvura yekunyudza curve yepepa resefa inoita kunge yakapfava.

Iyo cellulose ether chimiro chine hydroxyl mapoka uye ether zvisungo. Maatomu ari pamapoka aya anodyidzana nemamorekuru emvura kuti aumbe mahydrogen bond, kuitira kuti mamorekuru emvura akasununguka ave mvura yakasungwa, nokudaro achiita basa rakanaka mukuchengetedza mvura. Mudhaka, kuti igadzikane, gypsum inoda mvura Wana hydrated. Nhamba inonzwisisika ye cellulose ether inogona kuchengetedza mwando mudhaka kwenguva yakareba yakakwana, kuitira kuti kugadzirisa uye kuomesa maitiro kuenderera mberi. Kana iyo dosage yakakura kwazvo, kwete chete mhedzisiro yekuvandudza haisi pachena, asiwo mutengo uchawedzera, saka inonzwisisika dosage yakakosha. Tichifunga nezvekuita uye viscosity musiyano weakasiyana-siyana ekuchengetedza mvura, zviri mukati me cellulose ether inotarwa kuva 0.10% yehuwandu hwehuwandu hwedhaka.

2.2 Mhedzisiro ye cellulose ether yemukati pane mechaniki zvinhu zvegypsum

2.2.1 Kupesvedzera pasimba rekumanikidza uye simba rekuchinjika

Reshiyo yeyakagadziriswa gypsum composite cementitious zvinhu kusvika pakati jecha i1:2.5. Shandura huwandu hwe cellulose ether uye gadzirisa huwandu hwemvura. Kubva pamigumisiro yekuedza, zvinogona kuonekwa kuti nekuwedzera kwezvinyorwa zve cellulose ether, simba rekumanikidzika rine maitiro makuru ekudzika pasi, uye simba rekushanduka-shanduka harina shanduko yakajeka.

Nekuwedzera kwe cellulose ether yemukati, iyo 7d yekumanikidza simba redhaka yakadzikira. Mabhuku [6] anotenda kuti izvi zvinonyanya kukonzerwa nekuti: (1) kana cellulose ether yawedzerwa mudhaka, mapolymer anochinjika mumatope pores anowedzera, uye aya anochinjika mapolymers haagone kupa rutsigiro rwakaomarara kana iyo composite matrix yakamanikidzwa. mhedzisiro, kuitira kuti simba rekumanikidza redhaka riderere (munyori wepepa rino anotenda kuti vhoriyamu ye cellulose ether polymer idiki kwazvo, uye kukanganisa kunoitwa nekumanikidza kunogona kuregererwa); (2) nekuwedzera kwemukati we cellulose ether, mhedzisiro yayo yekuchengeta mvura iri kuita zvirinani uye zvirinani, zvekuti mushure mekuumbwa kwevhu rekuyedza bhurosi, iyo porosity mumatope ebvunzo block inowedzera, iyo inoderedza kusimba kwemuviri wakaoma. uye inoderedza kukwanisa kwemuviri wakaoma kurwisana nemasimba ekunze, nokudaro kuderedza simba rekumanikidza revhu (3) Kana iyo yakaoma-yakavhenganiswa dhaka inosanganiswa nemvura, iyo cellulose ether particles inotanga kushambadzirwa pamusoro pezvikamu zvesamende kuti zvivepo. gadzira firimu ye latex, iyo inoderedza hydration yegypsum, nokudaro kuderedza simba redhaka. Nekuwedzera kweiyo cellulose ether yemukati, iyo yekupeta reshiyo yezvinhu yakadzikira. Zvisinei, kana mari yacho yakawandisa, kushanda kwedhaka kuchaderedzwa, izvo zvinoratidzwa mukuti dhaka rakanyanyisa, rinonamatira kune banga, uye rakaoma kupararira panguva yekuvaka. Panguva imwecheteyo, tichifunga kuti chiyero chekuchengetedza mvura chinofanirawo kusangana nemamiriro ezvinhu, chiyero che cellulose ether chinotarirwa kuva 0.05% kusvika 0.10% yehuwandu hwematokari.

2.2.2 Mhedzisiro pakusimba kwechisungo

Cellulose ether inonzi inochengetedza mvura, uye basa rayo nderekuwedzera chiyero chekuchengetedza mvura. Chinangwa ndechekuchengetedza hunyoro huri mu gypsum slurry, kunyanya mushure mekunge gypsum slurry yaiswa kumadziro, hunyoro hahuzobatwa nemadziro emadziro, kuitira kuti ive nechokwadi chekuchengetwa kwehunyoro hwegypsum slurry pane interface. Hydration reaction, kuitira kuti ive nechokwadi chekusimba kwechisungo cheiyo interface. Chengetedza chiyero chegypsum composite cementitious material kusvika pakati pejecha pa1:2.5. Shandura huwandu hwe cellulose ether uye gadzirisa huwandu hwemvura.

Inogona kuonekwa kubva mumigumisiro yekuedza kuti nekuwedzera kwezvinyorwa zve cellulose ether, kunyange zvazvo simba rekumanikidzika richiderera, simba rayo rekubatana rinowedzera zvishoma nezvishoma. Kuwedzerwa kwe cellulose ether kunogona kuumba firimu repolymer rakatetepa pakati pe cellulose ether uye hydration particles. Iyo cellulose ether polymer firimu ichanyungudika mumvura, asi pasi pemamiriro akaoma, nekuda kwekubatana kwayo, ine simba rekudzivirira Basa rekunyorova evaporation. Iyo firimu ine chisimbiso chekuita, iyo inovandudza kuoma kwedhaka. Pamusana pekuchengetedzwa kwemvura yakanaka ye cellulose ether, mvura yakakwana inochengetwa mukati medhaka, nokudaro kuve nechokwadi chekukura kwakakwana kwe hydration kuoma uye kusimba, nekuvandudza kusungirirwa kwesimba redhaka. Mukuwedzera, kuwedzerwa kwe cellulose ether kunovandudza kubatanidzwa kwedhaka, uye kunoita kuti dhaka rive nepurasitiki yakanaka uye kushanduka, izvo zvinoitawo kuti dhaka rikwanise kuenderana ne shrinkage deformation ye substrate, nokudaro kuvandudza kusimba kwechisungo chedhaka. . Nekuwedzera kwezvinyorwa zve cellulose ether, kusungirirwa kwegypsum mortar kune zvinyorwa zvepasi kunowedzera. Kana kusimba kwekubatanidza kwegypsum yekupurasita yepasi iri > 0.4MPa, iyo tensile bonding simba inokwana uye inosangana neyakajairwa "Plastering Gypsum" GB/T2827.2012. Zvisinei, tichifunga kuti cellulose ether inokwana 0.10% B inch, simba racho harina kuzadzisa zvinodiwa, saka zvinyorwa zve cellulose zvakatemwa kuva 0.15% yehuwandu hwehuwandu hwedhaka.

3. Mhedziso

(1) Mwero wekuchengetedza mvura wakayerwa nesefa bepa rekutora mvura nzira (2) haigone kuvhura mutsauko mukuita uye kuyerwa kwemumiriri wekuchengetedza mvura, izvo zvisingaenderane nekuyedza uye kutonga kwechiyero chekuchengetedza mvura. gypsum yekutengesa dhaka. Iyo vacuum suction nzira inogona kunyatsosiyanisa yakanakisa kuchengetedza kwemvura kuita kwedhaka, uye haina kukanganiswa nekushandiswa kwemvura kwedhaka. Kunyangwe mhedzisiro yekuyedzwa kwesefa bepa remvura yekunyudza nzira (1) inokanganiswa nekushandiswa kwemvura kwedhaka, nekuda kwematanho akareruka ekuyedza ekuita, mashandiro ekuchengetedza mvura edhaka anogona kuenzaniswa pasi peiyo fomula imwechete.

(2) Kuwedzera kwemukati we cellulose ether kunovandudza kuchengetwa kwemvura yegypsum mortar.

(3) Kubatanidzwa kwe cellulose ether kunoderedza kusimba kwesimba redhaka uye kunovandudza kusimba kwekubatanidza ne substrate. Cellulose ether ine simba shoma pakusimba kwedhaka, saka chiyero chekupeta chedhaka chinoderedzwa.