Kufuridzirwa kwezvinhu zvakadai sekuchinja kwe viscosity ye hydroxyethyl methylcellulose (HEMC), ingave yakashandurwa kana kuti kwete, uye kuchinja kwemukati pane kushushikana kwegoho uye viscosity yeplastiki yevhu itsva yesamende yakadzidzwa. Kune HEMC isina kugadziriswa, iyo yakakwirira ye viscosity, yakaderera kushushikana kwegoho uye plastiki viscosity yedhaka; simba rekuchinja kweviscosity yeHEMC yakagadziridzwa pane rheological properties yematope inopera simba; pasinei nokuti yakagadziridzwa here kana kuti kwete, iyo yakakwirira ye viscosity yeHEMC, yakaderera iyo Kunonoka kwekugadzirisa kwegoho kunetseka uye plastiki viscosity kukura kwedhaka kunonyanya kuoneka. Apo zvinyorwa zveHEMC zvakakura kudarika 0.3%, kushushikana kwegoho uye plastiki viscosity yedhaka inowedzera nekuwedzera kwezvinyorwa; apo zvinyorwa zveHEMC zvakakura, kushushikana kwegoho revhu kunoderera nenguva, uye huwandu hweplastiki viscosity hunowedzera nenguva.
Mazwi akakosha: hydroxyethyl methylcellulose, dhaka nyowani, rheological properties, goho kushushikana, plastiki viscosity
I. Nhanganyaya
Nekuvandudzwa kwetekinoroji yekuvaka dhaka, kutarisisa kwakawanda kwakabhadharwa kune mechanized kuvaka. Kufambisa kureba kwakatwasuka kunoisa mberi zvinodiwa zvitsva zvepombi dhaka: mvura yakanaka inofanira kuchengetedzwa mukati mese pakupomba. Izvi zvinoda kudzidza zvinofurira zvinhu uye zvinodzivirira mamiriro evhu fluidity, uye yakajairika nzira ndeyekutarisa rheological paramita yedhaka.
Iyo rheological properties yedhaka inonyanya kuenderana nemhando uye huwandu hwezvinhu zvakasvibiswa. Cellulose ether musanganiswa unoshandiswa zvakanyanya mudhaka remaindasitiri, ane simba guru pane rheological properties yedhaka, saka nyanzvi dzekumba nekune dzimwe nyika dzakaita tsvakiridzo pazviri. Mukupfupisa, mhedziso dzinotevera dzinogona kutorwa: kuwedzera kwehuwandu hwe cellulose ether kuchaita kuti kuwedzera kwekutanga torque yedhaka, asi mushure menguva yekukurudzira, kuyerera kupikisa kwedhaka kuchaderera panzvimbo (1) ; apo mvura yekutanga inenge yakangofanana, kuyerera kwedhaka kucharasika kutanga. yakawedzera mushure mekuderera (2); simba regoho uye plastiki viscosity yedhaka yakaratidza maitiro ekuderera kwekutanga uye kuwedzera, uye cellulose ether yakakurudzira kuparadzwa kwechigadzirwa chedhaka uye yakawedzera nguva kubva pakuparadzwa kusvika pakuvakazve (3); Ether uye hupfu hwakakora vane viscosity yakakwirira uye kugadzikana etc. (4). Nekudaro, zvidzidzo zviri pamusoro zvichine zvikanganiso:
Zviyero zvekuyera uye maitiro evadzidzi vakasiyana hazvina kufanana, uye mhedzisiro yebvunzo haigone kuenzaniswa nemazvo; chiyero chekuedza chechiridzwa chinogumira, uye rheological parameters yedhaka yakayerwa ine zvishoma zvishoma zvekusiyana, izvo zvisingamiriri zvakanyanya; pane kushaikwa kwekuenzanisa miedzo pa cellulose ethers ine viscosities dzakasiyana; Pane zvakawanda zvinofurira zvinhu, uye kudzokorora hakuna kunaka. Mumakore achangopfuura, kutaridzika kweiyo Viskomat XL dhaka rheometer yakapa kurerukira kukuru kwekutemerwa kwakaringana kweiyo rheological zvimiro zvedhaka. Iyo ine mabhenefiti eiyo yakakwira otomatiki kudzora nhanho, hukuru hukuru, yakafara bvunzo renji, uye bvunzo mhedzisiro inowirirana nemamiriro chaiwo. Mubepa rino, zvichibva pakushandiswa kwerudzi urwu rwechiridzwa, mhedzisiro yekutsvagisa yevadzidzi varipo inogadzirwa, uye chirongwa chebvunzo chinogadzirwa kuti chidzidze maitiro emhando dzakasiyana uye viscosities yehydroxyethyl methylcellulose (HEMC) pane rheology yedhaka mu. yakakura dosage range. performance impact.
2. Rheological model ye fresh simenti mortar
Sezvo rheology yakaunzwa musimende nesainzi yekongiri, nhamba huru yezvidzidzo zvakaratidza kuti kongiri nyowani nedhaka zvinogona kutorwa seBingham fluid, uye Banfill akawedzera kutsanangura kugona kwekushandisa modhi yeBingham kutsanangura rheological properties yedhaka (5). Muchienzaniso cherheological equation τ=τ0+μγ yemuenzaniso weBingham, τ ishear stress, τ0 ndiko kushushikana kwegoho, μ ndiyo yepurasitiki viscosity, uye γ chiyero chekugera. Pakati pavo, τ0 uye μ ndiwo maviri anonyanya kukosha parameters: τ0 ndiyo shoma shoma yekuveura inogona kuita kuti dhaka resimende riyerere, uye chete kana τ> τ0 ichishanda padhaka, dhaka rinogona kuyerera; μ inoratidza kupikisa kwe viscous kana dhaka richiyerera Iyo yakakura iyo μ, inononoka dhaka rinoyerera [3]. Muchiitiko apo zvose τ0 uye μ hazvizivikanwi, shear stress inofanira kuyerwa kanenge maviri akasiyana mashear mitengo isati yaverengwa (6).
Mune yakapihwa dhaka rheometer, iyo NT curve inowanikwa nekuseta blade kutenderera chiyero N uye kuyera torque T inogadzirwa nekuveura kuramba kwedhaka inogona kushandiswa kuverenga imwe equation T=g+ inoenderana neBingham modhi Iyo miviri paramita. g uye h yeNh. g inoenzana nekushushikana kwegoho τ0, h inoenzanirana neplastic viscosity μ, uye τ0 = (K/G) g, μ = (l/G) h, apo G inogara ichienderana nechiridzwa, uye K inogona kupfuudzwa kuburikidza nekuyerera kunozivikanwa Inowanikwa nekugadzirisa mvura ine hunhu hunoshanduka neshear rate[7]. Nekuda kwekureruka, bepa rino rinokurukura zvakananga g uye h, uye rinoshandisa shanduko yemutemo weg uye h kuratidza shanduko yemutemo wekushushikana kwegoho uye viscosity yepurasitiki yedhaka.
3. Muedzo
3.1 Raw zvinhu
3.2 jecha
Jecha reQuartz: jecha rakakora i20-40 mesh, jecha repakati rine 40-70 mesh, jecha rakanaka 70-100 mesh, uye matatu akasanganiswa muchiyero che2: 2: 1.
3.3 Cellulose ether
Hydroxyethyl methylcellulose HEMC20 (viscosity 20000 mPa s), HEMC25 (viscosity 25000 mPa s), HEMC40 (viscosity 40000 mPa s), uye HEMC45 (viscosity 45000 mPa s), iyo HEMC4 cellulose inogadziriswa Andified.
3.4 Kusanganisa mvura
pombi mvura.
3.5 Kuedza chirongwa
Irime-jecha reshiyo ndeye 1: 2.5, kushandiswa kwemvura kunogadziriswa pa60% yesimenti inoshandiswa, uye HEMC inokwana 0-1.2% yekushandiswa kwesimenti.
Kutanga kusanganisa simende yakayerwa, HEMC nejecha requartz zvakaenzana, wobva wawedzera mvura yekusanganisa zvinoenderana neGB/T17671-1999 uye kurunga, wozoshandisa Viskomat XL mortar rheometer kuti uedze. Maitiro ekuedzwa ndeokuti: kumhanya kunokurumidza kuwedzera kubva pa0 kusvika 80rpm pa0 ~ 5min, 60rpm pa5 ~ 7min, 40rpm pa7 ~ 9min, 20rpm pa9 ~ 11min, 10rpm pa11 ~ 13min, uye 5rpm pa13 ~ 15min , 15 ~ 30min, kumhanya ndeye 0rpm, uyezve kutenderera kamwe chete makumi matatu ega ega maererano nemaitiro ari pamusoro, uye yakazara nguva yekuyedza i120min.
4. Migumisiro uye nhaurirano
4.1 Mhedzisiro yeHEMC viscosity shanduko pane rheological properties ye simenti mortar
(Kuwanda kweHEMC ndeye 0.5% yesamende yakawanda), zvichifananidzira kusiyanisa mutemo wekushungurudzika kwegoho uye plastiki viscosity yedhaka. Zvinogona kuonekwa kuti kunyange zvazvo viscosity yeHEMC40 yakakwirira kudarika yeHEMC20, kushushikana kwegoho uye plastiki viscosity yedhaka yakasanganiswa neHEMC40 yakaderera pane iyo yedhaka yakasanganiswa neHEMC20; kunyange zvazvo viscosity yeHEMC45 iri 80% yakakwirira kupfuura iyo yeHEMC25, kushushikana kwegoho kwedhaka kwakaderera zvishoma, uye plastiki viscosity iri pakati Mushure memaminitsi makumi mapfumbamwe pane kuwedzera. Izvi zvinodaro nekuti iyo yakakwira viscosity ye cellulose ether, inononoka mwero wekunyungudika, uye inotora nguva yakareba kuti dhaka rakagadzirirwa naro risvike paviscosity yekupedzisira [8]. Mukuwedzera, panguva imwe chete muyedzo, kuwanda kwedhaka rakasanganiswa neHEMC40 rakanga rakaderera pane iro revhu rakasanganiswa neHEMC20, uye iyo yedhaka yakasanganiswa neHEMC45 yakanga yakaderera pane iyo yedhaka yakasanganiswa neHEMC25, zvichiratidza kuti HEMC40 neHEMC45 yakaunza mamwe mabhuru emhepo, uye mabhuru emhepo ari mudhaka ane ""Bhora" mhedzisiro, iyo inoderedzawo kuyerera kwedhaka.
Mushure mekuwedzera HEMC40, kushushikana kwegoho kwedhaka kwaive kwakaenzana mushure memaminitsi makumi matanhatu, uye viscosity yepurasitiki yakawedzera; mushure mekuwedzera HEMC20, kushushikana kwegoho redhaka kwakasvika pakuenzana mushure memaminitsi makumi matatu, uye viscosity yepurasitiki yakawedzera. Zvinoratidza kuti HEMC40 ine yakanyanya kudzoreredza mhedzisiro pakuvandudza kwegoho redhaka kushushikana uye epurasitiki viscosity kupfuura HEMC20, uye inotora nguva yakareba kuti isvike iyo yekupedzisira viscosity.
Kushungurudzika kwegoho redhaka rakasanganiswa neHEMC45 rakaderera kubva ku0 kusvika kumaminitsi e120, uye viscosity yepurasitiki yakawedzera mushure memaminitsi makumi mapfumbamwe; nepo kushushikana kwegoho kwedhaka rakasanganiswa neHEMC25 kwakawedzera mushure memaminitsi makumi mapfumbamwe, uye viscosity yepurasitiki yakawedzera mushure memaminitsi makumi matanhatu. Zvinoratidza kuti HEMC45 ine yakanyanya kudzoreredza mhedzisiro pakuvandudza kwegoho redhaka kushushikana uye epurasitiki viscosity kupfuura HEMC25, uye nguva inodiwa kusvika kune yekupedzisira viscosity zvakare zvakareba.
4.2 Mhedzisiro yeHEMC yemukati pane kushushikana kwegoho resimende dhaka
Munguva yekuyedzwa, zvinhu zvinokanganisa kushushikana kwegoho redhaka ndezvi: dhaka delamination uye kubuda ropa, kukuvadzwa kwechimiro nekukurudzira, kuumbwa kwezvigadzirwa zve hydration, kuderedzwa kwehunyoro hwemahara mudhaka, uye kudzoreredza mhedzisiro ye cellulose ether. Pakudzoreredza mhedzisiro ye cellulose ether, iyo inonyanya kugamuchirwa maonero ndeyekuitsanangura neiyo adsorption yemisanganiswa.
Zvinogona kuonekwa kuti kana HEMC40 yakawedzerwa uye zvinyorwa zvayo zvisingasviki 0.3%, kushushikana kwegoho redhaka kunoderera zvishoma nezvishoma nekuwedzera kweHEMC40; kana zvirimo zveHEMC40 zvakakura kupfuura 0.3%, kushushikana kwegoho revhu kunowedzera zvishoma nezvishoma. Nekuda kwekubuda ropa uye delamination yedhaka isina cellulose ether, hapana simende paste yakakwana pakati peaggregates kuti mafuta, zvichikonzera kuwedzera kwekunetseka kwegoho uye kuoma mukuyerera. Kuwedzerwa kwakakodzera kwe cellulose ether kunogona kuvandudza zvinobudirira dhaka delamination phenomenon, uye yakaunzwa mabhubhu emhepo akaenzana nediki "mabhora", anogona kuderedza kushushikana kwegoho redhaka uye kuita kuti zvive nyore kuyerera. Sezvo zviri mukati me cellulose ether zvichiwedzera, hunyoro hwayo hwakagadziriswa hunowedzerawo zvishoma nezvishoma. Kana zvinyorwa zve cellulose ether zvinodarika imwe kukosha, pesvedzero yekuderedzwa kwehunyoro hwemahara inotanga kuita basa rinotungamira, uye kushushikana kwegoho kwedhaka kunowedzera zvishoma nezvishoma.
Kana huwandu hweHEMC40 huri pasi pe0.3%, kushushikana kwegoho redhaka kunoderera zvishoma nezvishoma mukati me0-120min, iyo inonyanya kuenderana nekuwedzera kwakakomba delamination yedhaka, nekuti pane imwe chinhambwe pakati peblade nepasi pe. chiridzwa, uye aggregate pashure delamination kunyura pasi, repamusoro kuramba anova diki; kana iyo HEMC40 yemukati iri 0.3%, dhaka haringambo dhizaini, iyo adsorption ye cellulose ether ishoma, iyo hydration iri kutonga, uye goho kushushikana kune kumwe kuwedzera; iyo HEMC40 yemukati ndeye Kana zviri mukati me cellulose ether iri 0.5% -0.7%, adsorption ye cellulose ether inowedzera zvishoma nezvishoma, iyo hydration rate inoderera, uye maitiro ekuvandudza kwegoho kushushikana kwedhaka kunotanga kuchinja; Pamusoro, mwero we hydration wakadzikira uye kushushikana kwegoho redhaka kunoderera nekufamba kwenguva.
4.3 Mhedzisiro yeHEMC yemukati pane epurasitiki viscosity yesamende dhaka
Zvinogona kuoneka kuti mushure mekuwedzera HEMC40, iyo yepurasitiki viscosity yedhaka inowedzera zvishoma nezvishoma nekuwedzera kweHEMC40 yemukati. Izvi zvinodaro nekuti cellulose ether ine thickening mhedzisiro, iyo inogona kuwedzera viscosity yemvura, uye iyo yakakura dosi, iyo yakakura viscosity yedhaka. Chikonzero nei purasitiki viscosity yedhaka inoderera mushure mekuwedzera 0.1% HEMC40 inokonzerwawo ne "bhora" mhedzisiro yekuiswa kwemhepo mabhubhu, uye kuderedzwa kwekubuda ropa uye delamination yedhaka.
Iyo yepurasitiki viscosity yedhaka rakajairwa pasina kuwedzera cellulose ether zvishoma nezvishoma inoderera nekufamba kwenguva, iyo inobatanawo neiyo yakaderera density yechikamu chepamusoro chinokonzerwa nekuiswa kwedhaka; kana zvirimo zveHEMC40 zviri 0.1% -0.5%, chimiro chedhaka chakafanana, uye chimiro chedhaka chakafanana mushure memaminitsi makumi matatu. Iyo plastiki viscosity haina kuchinja zvakanyanya. Panguva ino, inonyanya kuratidza viscosity mhedzisiro ye cellulose ether pachayo; mushure mokunge zvinyorwa zveHEMC40 zvakakura kudarika 0.7%, iyo plastiki viscosity yedhaka inowedzera zvishoma nezvishoma nekuwedzera kwenguva, nokuti viscosity yematope inobatanawo neye cellulose ether. Iyo viscosity ye cellulose ether solution inowedzera zvishoma nezvishoma mukati menguva yenguva mushure mekutanga kusanganiswa. Iyo yakakura dosi, iyo inonyanya kukosha mhedzisiro yekuwedzera nekufamba kwenguva.
V. Mhedziso
Zvinhu zvakadai sekuchinja kweviscosity yeHEMC, ingave yakagadziridzwa kana kwete, uye kuchinja kweyero kuchaita zvakanyanya rheological properties yedhaka, iyo inogona kuratidzirwa nemiganhu miviri yegoho kushungurudzika uye plastiki viscosity.
Kune HEMC isina kuchinjwa, iyo yakakura viscosity, yakaderera kushushikana kwegoho uye plastiki viscosity yedhaka mukati me 0-120min; simba rekuchinja kweviscosity yeHEMC yakagadziridzwa pane rheological properties yedhaka haina simba kupfuura yeHEMC isina kuchinjwa; pasinei nekugadziriswa Ingave isingagumi kana kwete, iyo yakakura viscosity yeHEMC, iyo inonyanya kukosha kunonoka kunokonzerwa nekugadzirwa kwehutu hwegoho kushungurudzika uye plastiki viscosity.
Paunenge uchiwedzera HEMC40 ine viscosity ye40000mPa · s uye zvinyorwa zvayo zvakakura kudarika 0.3%, kushushikana kwegoho kwedhaka kunowedzera zvishoma nezvishoma; apo zvinyorwa zvinodarika 0.9%, kushushikana kwegoho revhu kunotanga kuratidza maitiro ekuderera zvishoma nezvishoma nenguva; Iyo yepurasitiki viscosity inowedzera nekuwedzera kweHEMC40 yemukati. Kana zviri mukati zvakakura kupfuura 0.7%, iyo plastiki viscosity yedhaka inotanga kuratidza maitiro ekuwedzera zvishoma nezvishoma nenguva.
Nguva yekutumira: Nov-24-2022