Cellulose Eteri Viscosity Shanduko pane Cement based plaster

Kukora chinhu chakakosha gadziriso ye cellulose ether pane simende-yakavakirwa zvinhu. Mhedzisiro ye cellulose ether yemukati, viscometer kutenderera kumhanya uye tembiricha pane viscosity shanduko ye cellulose ether yakagadziridzwa simende.based plaster dzakadzidzwa. Migumisiro inoratidza kuti viscosity ye simentibased plaster inowedzera nguva dzose nekuwedzera kwe cellulose ether content, uye viscosity ye cellulose ether solution uye simenti.based plaster ine "composite superposition effect"; iyo pseudoplasticity ye cellulose ether yakagadziridzwa simendebased plaster yakaderera pane yesamende yakachenabased plaster, uye viscosity Kudzikisa kumhanya kwekutenderera kwechiridzwa, kana kudzikisa viscosity ye cellulose ether yakagadziridzwa simende.based plaster, kana kuti kuderera kwemukati we cellulose ether, kunowedzera kuoneka kwepseudoplasticity ye cellulose ether yakagadziridzwa simende.based plaster; Nekubatanidzwa kwe hydration, viscosity ye cellulose ether yakagadziridzwa simentibased plaster zvichawedzera kana kuderera. Mhando dzakasiyana dze cellulose ether dzine shanduko dzakasiyana muviscosity yesamende yakagadziridzwabased plaster.

Mazwi akakosha: cellulose ether; simendebased plaster; viscosity

0,Nhanganyaya

Cellulose ethers inowanzoshandiswa semvura inochengetedza maajenti uye makobvu kune esimende-based zvinhu. Zvinoenderana neakasiyana anotsiva, cellulose ethers anoshandiswa mu simenti-based zvinhu zvinowanzo sanganisira methyl cellulose (MC), hydroxyethyl cellulose (HEC), hydroxyethyl methyl cellulose Ether (Hydroxyethyl methyl cellulose, HEMC) uye hydroxypropyl methyl cellulose (Hydroxypropyl methylMC). pakati peiyo HPMC neHEMC ndiyo inonyanya kushandiswa.

Kukora chinhu chakakosha gadziriso ye cellulose ether pane simende-yakavakirwa zvinhu. Cellulose ether inogona kupa dhaka rakanyorova neakanakisa viscosity, zvakanyanya kuwedzera kugona kwekubatanidza pakati pedhaka rakanyorova uye base layer, uye kugadzirisa iyo anti-sag kuita kwedhaka. Inogona zvakare kuwedzera homogeneity uye anti-kupararira kugona kwezvichangobva kusanganiswa simende-zvakavakirwa zvinhu, uye kudzivirira delamination, kupatsanura uye kubuda ropa kwedhaka nekongiri.

Iko kukora mhedzisiro ye cellulose ether pane simende-yakavakirwa zvinhu inogona kuongororwa kuwanda neiyo rheological modhi yesimende-yakavakirwa zvinhu. Cement-based materials inowanzoonekwa seBingham fluid, ndiko kuti, kana kushandiswa kweshear stress r iri pasi pegoho rekutambudzika r0, zvinhu zvinoramba zviri muchimiro chayo chepakutanga uye hazviyerere; apo shear stress r inodarika goho rekutambudzika r0, chinhu chinosangana nekuyerera kwe deformation, uye shear stress The stress r ine hukama hwemutsara ne strain rate y, kureva, r = r0 + f.·y, apo f ndiyo yepurasitiki viscosity. Cellulose ethers inowanzo wedzera kushushikana kwegoho uye viscosity yepurasitiki yesimende-yakavakirwa zvinhu, zvisinei, yakaderera dosages inotungamira kune yakaderera goho kusagadzikana uye epurasitiki viscosity, kunyanya nekuda kwemhepo-entraining mhedzisiro ye cellulose ethers. Tsvagiridzo yaPatural inoratidza kuti huremu hwema cellulose ether hunowedzera, kushushikana kwegoho resimende.based plaster inoderera, uye kuwirirana kunowedzera.

Iyo viscosity ye simentibased plaster indekisi yakakosha yekuongorora kukora kweserulosi ether pane simende-based zvinhu. Mamwe mabhuku akaongorora iyo viscosity shanduko yemutemo we cellulose ether mhinduro, asi pachine kushaikwa kwekutsvaga kwakakodzera pamusoro pemhedzisiro ye cellulose ether pane viscosity shanduko ye simenti.based plaster. Panguva imwecheteyo, maererano nemhando dzakasiyana-siyana dzezvinotsiva, kune marudzi akawanda e-cellulose ethers. Mhedzisiro yemhando dzakasiyana uye viscosities ye cellulose ethers pane shanduko yesamendebased plaster viscosity zvakare inyaya ine hanya zvikuru mukushandiswa kwe cellulose ethers. Iri basa rinoshandisa viscometer inotenderera kuti idzidze viscosity shanduko ye cellulose ether yakagadziridzwa simende slurries emhando dzakasiyana uye viscosities pasi peakasiyana poly-ash ratios, kumhanya kutenderera uye tembiricha.

1. Kuedza

1.1 Raw zvinhu

(1) Cellulose ether. Mhando nhanhatu dzema cellulose ethers dzinowanzo shandiswa munyika yangu dzakasarudzwa, kusanganisira 1 mhando yeMC, 1 mhando yeHEC, 2 marudzi eHPMC uye 2 marudzi eHEMC, pakati pawo maviscosities e2 marudzi eHPMC uye maviri marudzi eHEMC aive pachena. zvakasiyana. Iyo viscosity ye cellulose ether yakaedzwa neNDJ-1B rotational viscometer (Shanghai Changji Company), iyo yekumisikidzwa kwebvunzo mhinduro yaive 1.0% kana 2.0%, tembiricha yaive makumi maviri.°C, uye kumhanya kwekutenderera kwaive 12r/min.

(2) Simende. Yakajairika Portland simende inogadzirwa naWuhan Huaxin Cement Co., Ltd. ine zvirevo zveP.·O 42.5 (GB 175-2007).

1.2 Viscosity yekuyera nzira ye cellulose ether mhinduro

Tora sampuli ye cellulose ether yemhando yakatarwa uye woiwedzera kune 250mL yegirazi beaker, wobva wawedzera 250g yemvura inopisa pamakumi mapfumbamwe.°C; kurunga zvizere negirazi tsvimbo kuita cellulose eteri kuumba yunifomu dispersion hurongwa mumvura inopisa, uye panguva imwe chete kuisa beaker Cool mumhepo. Kana iyo mhinduro inotanga kuburitsa viscosity uye isingadzokeri zvakare, rega kumhanyisa nekukurumidza; apo mhinduro yacho yakatonhodzwa mumhepo kusvikira ruvara rwaita yunifomu, isa beaker mune inogara tembiricha yemvura yekugezera, uye chengetedza tembiricha kusvika kune yakatarwa tembiricha. Iko kukanganisa ndiko± 0.1°C; mushure me2h (yakaverengwa kubva panguva yekubatana kwe cellulose ether nemvura inopisa), kuyera kutonhora kwepakati pekugadzirisa ne thermometer. Production) rotor inopinzwa mumhinduro kune kudzika kwakataurwa, mushure mekumira kwe5min, kuyera viscosity yayo.

1.3 Viscosity kuyerwa kwe cellulose ether yakagadziridzwa simendebased plaster

Kusati kwaedza, chengetedza zvese zvakabikwa patembiricha yakataurwa, yera huremu hwakatarwa hweselulosi ether nesimende, zvisanganise zvakakwana, uye wowedzera mvura yepombi patembiricha yakatarwa mu250mL yegirazi beaker ine mvura-samende reshiyo ye0.65; wobva waisa poda yakaoma mubeaker womirira kwemaminetsi matatu Nyatsonya negirazi tsvimbo ka300, isa rotor yeinotenderera viscometer (NDJ-1B type, inogadzirwa neShanghai Changji Geological Instrument Co., Ltd.) mhinduro kune kudzika kwakatarwa, uye kuyera viscosity yayo mushure mekumira kwemaminetsi maviri. Kuti udzivise pesvedzero ye simenti hydration kupisa pane viscosity test ye simentibased plaster zvakanyanya sezvinobvira, iyo viscosity ye cellulose ether yakagadziridzwa simendebased plaster inofanira kuongororwa kana simende yasangana nemvura kwemaminitsi mashanu.

2. Migumisiro uye kuongorora

2.1 Mhedzisiro ye cellulose ether yemukati

Huwandu hwe cellulose ether pano hunoreva kuwanda kwehuwandu hwe cellulose ether kune simenti, kureva, polyash ratio. Kubva pakupesvedzerwa kweP2, E2 uye H1 marudzi matatu e-cellulose ethers pane viscosity shanduko ye simenti.based plaster pamadosi akasiyana (0.1%, 0.3%, 0.6% uye 0.9%), zvinogona kuonekwa kuti mushure mekuwedzera cellulose ether, viscosity ye simenti.based plaster Viscosity inowedzera; sezvo huwandu hwe cellulose ether hunowedzera, viscosity ye simentibased plaster inowedzera nguva dzose, uye huwandu hwekuwedzera kwe viscosity ye simentibased plaster zvakare inova hombe.

Kana chiyero chemvura-samende chiri 0.65 uye cellulose ether inokwana 0.6%, tichifunga nezvemvura inopedzwa nekutanga hydration ye simenti, kusanganiswa kwe cellulose ether maererano nemvura inenge 1%. Kana iyo yekuisa iri 1%, iyo P2, E2 uye H1 aqueous mhinduro Iwo maviscosities ari 4990mPa.·S, 5070mPa·S uye 5250mPa·s zvichiteerana; apo mvura-simende reshiyo iri 0.65, viscosity yakachena simendebased plaster iri 836 mPa·S. Zvisinei, maviscosities eP2, E2 uye H1 matatu cellulose ether yakagadziridzwa simende slurries ndeye 13800mPa.·S, 12900mPa·S uye 12700mPa·s zvichiteerana. Zviripachena, viscosity ye cellulose ether yakagadziridzwa simendebased plaster haisi iyo viscosity ye cellulose ether mhinduro uye Iyo nyore kuwedzera kweiyo viscosity ye pure simenti.based plaster yakakura zvakanyanya kudarika huwandu hwemaviscosities maviri, ndiko kuti, viscosity ye cellulose ether solution uye viscosity ye simenti.based plaster iva ne "composite superposition effect". Iyo viscosity ye cellulose ether mhinduro inobva kune yakasimba hydrophilicity ye hydroxyl mapoka uye ether zvisungo mu cellulose ether mamorekuru uye matatu-dimensional network yakaumbwa ne cellulose ether mamorekuru mune mhinduro; viscosity ye simende yakachenabased plaster inobva kunetiweki yakaumbwa pakati pesimende hydration zvigadzirwa chimiro. Sezvo iyo polymer uye simende hydration zvigadzirwa zvinowanzogadzira inopindirana network chimiro, mu cellulose ether yakagadziridzwa simende.based plaster, iyo matatu-dimensional network chimiro che cellulose ether uye netiweki chimiro chesimende hydration zvigadzirwa zvakabatanidzwa, uye cellulose ether mamorekuru Adsorption ine simende hydration zvigadzirwa pamwe chete zvinogadzira "composite superposition athari", iyo inowedzera zvakanyanya kutaridzika kwesemende.based plaster; sezvo imwe cellulose ether molecule inogona kuruka neakawanda cellulose ether mamorekuru uye simende hydration zvigadzirwa, Naizvozvo, nekuwedzera kweselulosi ether zvirimo, kuwanda kweiyo network chimiro kunowedzera kupfuura kuwedzera kwe cellulose ether mamorekuru, uye viscosity yesimende.based plaster kuwedzera nguva dzose; kuwedzera, kukurumidza hydration ye simenti inoda kuita chikamu chemvura. , iyo yakaenzana nekuwedzera kusanganiswa kwe cellulose ether, iyo zvakare chikonzero chekuwedzera kukuru kweviscosity ye simenti.based plaster.

Sezvo cellulose ether uye simendebased plaster Iva ne "composite superposition effect" mu viscosity, pasi pezvakafanana cellulose ether content uye mvura-simende ratio mamiriro, viscosity ye cellulose ether yakagadziridzwa simenti.based plaster nemusiyano uripachena kana kutariswa kuri 2% Musiyano we viscosity hauna kukura, semuenzaniso, maviscosities eP2 uye E2 ari 48000mPa.·s uye 36700mPa·s zvakateerana mumhinduro ine aqueous ine concentration ye2%. S, musiyano hausi pachena; iwo maviscosities eE1 uye E2 mu2% ane aqueous solution ari 12300mPa·S uye 36700mPa·s zvakateerana, mutsauko wakakura kwazvo, asi iwo maviscosities eakagadziridzwa simende paste ari 9800mPa.·S uye 12900mPa zvichiteerana·S, mutsauko wakadzikiswa zvakanyanya, saka pakusarudza cellulose ether muinjiniya, hazvifanirwe kutsvaga yakawandisa cellulose ether viscosity. Uyezve, mumashandisirwo einjiniya anoshanda, kuwanda kwe cellulose ether kunoenderana nemvura kunowanzo kuderera. Semuenzaniso, mune yakajairwa plastering dhaka, chiyero chemvura-simende chinowanzoita 0.65, uye zviri mukati me cellulose ether ndeye 0.2% kusvika 0.6%. Kuwanda kwemvura kuri pakati pe0.3% ne1%.

Izvo zvinogona zvakare kuvonekwa kubva pamhedzisiro yekuedzwa kuti mhando dzakasiyana dze cellulose ether dzine mhedzisiro dzakasiyana pane viscosity ye simenti.based plaster. Kana iyo yekuisa iri 1%, iyo viscosities yeP2, E2 uye H1 matatu marudzi e cellulose ether aqueous solutions ari 4990mPa.·s, 5070mPa·S uye 5250mPa·S zvakateerana, viscosity yeH1 mhinduro ndiyo yepamusoro-soro, asi viscosity yeP2, E2 uye H1 matatu marudzi e cellulose ether Iyo viscosity yeether-modified simende slurries yaive 13800mPa.·S, 12900mPa·S uye 12700mPa·S zvakateerana, uye viscosity yeH1 yakagadziridzwa simende slurries yaive yakaderera. Izvi zvinodaro nekuti cellulose ethers kazhinji ine mhedzisiro yekunonoka simende hydration. Pakati pemhando nhatu dze cellulose ethers, HEC, HPMC uye HEMC, HEC ine simba rakasimba rekunonoka simende hydration. Naizvozvo, muH1 yakagadziridzwa simendebased plaster, nekuda kweinononoka simende hydration, network chimiro chesimenti hydration zvigadzirwa zvinokura zvishoma nezvishoma, uye viscosity ndiyo yakaderera.

2.2 Mhedzisiro yechiyero chekutenderera

Kubva pane simba rekutenderera kwekutenderera kwe viscometer pane viscosity ye simenti yakachenabased plaster uye cellulose ether yakagadziridzwa simendebased plaster, zvinogona kuonekwa kuti sezvo kukurumidza kutenderera kunowedzera, viscosity ye cellulose ether yakagadziridzwa simenti.based plaster uye simende yakachenabased plaster inodzikira kune akasiyana madhigirii, ndiko kuti, ivo vese vane pfuma yekuveura kutetepa uye ndeye pseudoplastic fluid. Iyo diki chiyero chekutenderera, iyo yakakura kuderera kweiyo viscosity yesement yesebased plaster nehuwandu hwekutenderera, ndiko kuti, iyo inonyanya kuoneka pseudoplasticity ye simentibased plaster. Nekuwedzera kweyero yekutenderera, curve ye viscosity inoderera ye simentibased plaster zvishoma nezvishoma inova flatter, uye pseudoplasticity inopera simba. Kuenzaniswa nesamende yakachenabased plaster, iyo pseudoplasticity ye cellulose ether yakagadziridzwa simendebased plaster haina kusimba, ndiko kuti, kuiswa kwe cellulose ether kunoderedza pseudoplasticity ye simenti.based plaster.

Kubva pane simba rekutenderera kumhanya pane viscosity ye simentibased plaster pasi pemhando dzakasiyana dze cellulose ether uye viscosities, zvinogona kuzivikanwa kuti simendebased plaster yakagadziridzwa neyakasiyana cellulose ether ine pseudoplastic simba rakasiyana, uye idiki iyo viscosity ye cellulose ether, iyo inokwirisa viscosity yesamende yakagadziridzwa.based plaster. Iyo inonyanya kujeka iyo pseudoplasticity ye simentibased plaster is; iyo pseudoplasticity yesimende yakagadziridzwabased plaster haina misiyano iri pachena nemhando dzakasiyana dze cellulose ether dzine maviscosities akafanana. Kubva kuP2, E2 neH1 marudzi matatu eselulosi ether yakagadziridzwa simendebased plaster mune zvakasiyana dosage (0.1%, 0.3%, 0.6% uye 0.9%), pesvedzero yekutenderera kumhanya pane viscosity inogona kuzivikanwa, P2, E2 uye H1 matatu marudzi efiber Simende slurries yakagadziridzwa ne plain ether ine zvakafanana bvunzo mhinduro. : kana huwandu hwe cellulose ether hwakasiyana, pseudoplasticity yavo yakasiyana. Iyo idiki yehuwandu hweselulosi ether, iyo yakasimba iyo pseudoplasticity yesamende yakagadziridzwa.based plaster.

Mushure mekunge simende yasangana nemvura, zvimedu zvesimende zviri pamusoro zvinokurumidza kunyura, uye zvigadzirwa zve hydration (kunyanya CSH gel) zvinogadzira agglomeration chimiro. Kana paine simba rekugera rinotungamira mumhinduro, iyo agglomeration chimiro ichavhurika, kuitira kuti pamwe negwara reshear simba Kumira kwekutungamira kuyerera kunoderedzwa, nekudaro kuratidza pfuma yekuveura kutetepa. Cellulose ether imhando ye macromolecule ine asymmetric chimiro. Kana mhinduro ichiripo, cellulose ether mamorekuru anogona kuve nemaitiro akasiyana. Kana paine simba rekugera rinotungamira mumhinduro, cheni refu yemorekuru inotendeuka ichienda. Iyo nzira yeshear force inodzikiswa, zvichikonzera kudzikira kwekuyerera kwekudzivirira, uye zvakare inoratidza pfuma yeshear kuonda. Kuenzaniswa nesamende hydration zvigadzirwa, cellulose ether mamorekuru anochinjika uye ane imwe buffering kugona kweshear simba. Naizvozvo, zvichienzaniswa nesamende yakachenabased plaster, iyo pseudoplasticity ye cellulose ether yakagadziridzwa simendebased plaster haina simba, uye, sezvo viscosity kana zviri mukati me cellulose ether zvichiwedzera, buffering mhedzisiro ye cellulose ether mamorekuru pashear force inova pachena. Plastiki inova isina simba.

2.3 Kufurira kwekushisa

Kubva pamhedzisiro yekushanduka kwekushisa (20°C, 27°c uye 35°C) pane viscosity ye cellulose ether yakagadziridzwa simendebased plaster, zvinogona kuonekwa kuti kana zvinyorwa zve cellulose ether zviri 0.6%, sezvo kutonhora kunowedzera, simenti yakachena.based plaster uye M1 Iyo viscosity yesamende yakagadziridzwabased plaster yakawedzera, uye viscosity yeimwe cellulose ether yakagadziridzwa simendebased plaster yakaderera, asi kuderera kwakanga kusiri kukuru, uye viscosity yeH1 yakagadziridzwa simentibased plaster yakaderera zvakanyanya. Kusvika paE2 yakagadziridzwa simentibased plaster ane hanya, kana polyash reshiyo iri 0.6%, viscosity esimendebased plaster inoderera nekuwedzera kwekushisa, uye kana polyash ratio iri 0.3%, viscosity ye simenti.based plaster inowedzera nekuwedzera kwekushisa.

Kazhinji kutaura, nekuda kwekuderera kweiyo intermolecular interaction force, viscosity yemvura inoderera nekuwedzera kwekushisa, iyo ndiyo nyaya ye cellulose ether solution. Nekudaro, sezvo tembiricha ichikwira, uye nguva yekubatana pakati pesimende nemvura ichiwedzera, kukurumidza kwe simenti hydration ichave yakanyanya kukurumidza, uye dhigirii re hydration richawedzera, saka viscosity ye simende yakachena.based plaster zvichawedzera pachinzvimbo.

Mu cellulose ether yakagadziridzwa simendebased plaster, cellulose ether ichave adsorbed kune pamusoro pe simenti hydration zvigadzirwa, nokudaro inhibiting simende hydration, asi mhando dzakasiyana uye huwandu hwema cellulose ethers vane hunyanzvi hwakasiyana hwekudzivisa simenti hydration, MC (yakadai seM1) ine simba risina simba rekudzivisa simenti hydration, uye sezvo tembiricha inowedzera, hydration rate ye simentibased plaster ichiri kukurumidza, saka sezvo kutonhora kunowedzera, iyo viscosity Inowanzowedzerwa; HEC, HPMC uye HEMC inogona kurambidza zvakanyanya simende hydration, sezvo tembiricha inowedzera, iyo hydration rate ye simenti.based plaster inononoka, saka sezvo tembiricha inowedzera, HEC, HPMC uye HEMC yakagadziridzwa simende Iyo viscosity yebased plaster (0.6% polyash ratio) inowanzoderedzwa, uye nekuda kwekuti kugona kweHEC kunonoka simende hydration yakakura kupfuura yeHPMC neHEMC, shanduko ye cellulose ether mukushanduka kwekushisa (20).°C, 27°c uye 35°C) Iyo viscosity yeH1 yakagadziridzwa simendebased plaster yakaderera zvakanyanya nekuwedzera kwekushisa. Nekudaro, simende hydration ichiripo kana tembiricha yakakwira, saka dhigirii rekudzikisa cellulose ether yakagadziridzwa simende.based plaster nekuwedzera kwekushisa hakusi pachena. Kusvika paE2 yakagadziridzwa simentibased plaster ine hanya, kana chiyero chakakwirira (chiyero chedota chiri 0.6%), mhedzisiro yekudzivisa simenti hydration iri pachena, uye viscosity inoderera nekuwedzera kwekushisa; apo muyero wakaderera (chiyero chedota chiri 0.3%), mugumisiro wekudzivisa simenti hydration haisi pachena, uye viscosity inowedzera nekuwedzera kwekushisa.

3. Mhedziso

(1) Nekuwedzera kuri kuita cellulose ether zvirimo, viscosity uye viscosity inowedzera mwero we simenti.based plaster ramba uchiwedzera. Iyo molecular network chimiro che cellulose ether uye netiweki chimiro chesimenti hydration zvigadzirwa zvakapindirana, uye yekutanga hydration ye simenti nenzira isina kunanga inowedzera kuwanda kwe cellulose ether, kuitira kuti viscosity ye cellulose ether mhinduro uye simende.based plaster ine "composite superposition effect", kureva, cellulose ether Iyo viscosity yesamende yakagadziridzwa.based plaster yakakura kudarika huwandu hwemaviscosities avo. Kuenzaniswa neHPMC uye HEMC yakagadziridzwa simende slurries, HEC yakagadziridzwa simende slurries ine yakaderera viscosity test maitiro nekuda kwekunonoka hydration kukura.

(2) Ose cellulose ether yakagadziridzwa simendebased plaster uye simende yakachenabased plaster vane midziyo yekuveura kuonda kana pseudoplasticity; iyo pseudoplasticity ye cellulose ether yakagadziridzwa simendebased plaster yakaderera pane yesamende yakachenabased plaster; iyo yakaderera mwero wekutenderera, kana cellulose Iyo yakaderera viscosity yeether-modified simendebased plaster, kana kuti kuderera kwemukati we cellulose ether, kunowedzera kuoneka kwepseudoplasticity ye cellulose ether-modified simende.based plaster.

(3) Sezvo tembiricha iri kuramba ichikwira, kumhanya uye dhigirii resimende hydration inowedzera, kuitira kuti viscosity ye simende yakachena.based plaster zvishoma nezvishoma inowedzera. Nekuda kwemhando dzakasiyana uye huwandu hwema cellulose ethers ane kugona kwakasiyana kuvharidzira simende hydration, viscosity yeakagadziridzwa simende paste inosiyana nekupisa.