Nguva yekugadzika kongiri ndiyo yakakosha parameter inobata kunaka kwekuvaka nekufambira mberi. Kana nguva yekuisa yakarebesa, inogona kutungamira kufambira mberi kwekuvaka uye kukuvadza kuoma kwekongiri; kana nguva yekumisikidza ipfupi, inogona kutungamirira kumatambudziko mukuvaka kongiri uye kukanganisa maitiro ekuvaka kweprojekiti. Kuti ugadzirise nguva yekugadzika kwekrete, kushandiswa kwezvigadziriso zvakave nzira yakajairika mukugadzirwa kwekongiri yemazuva ano.Hydroxyethyl Methyl Cellulose (HEMC), seyakajairwa yakagadziridzwa cellulose derivative, inoshandiswa zvakanyanya mukongiri admixtures uye inogona kukanganisa rheology, kuchengetedza mvura, nguva yekuisa uye zvimwe zvinhu zvekongiri.1. Zvinhu zvakakosha zveHEMC
HEMC is a modified cellulose, kazhinji inogadzirwa kubva kune yakasikwa cellulose kuburikidza ne ethylation uye methylation reactions. Iine mvura yakanaka solubility, thickening, kuchengetedza mvura uye gelling properties, saka inoshandiswa zvakanyanya mukuvaka, kuvhara, makemikari ezuva nezuva nemamwe minda. Mukongiri, HEMC inowanzoshandiswa seyakakora, kuchengetedza mvura uye rheology control agent, iyo inogona kuvandudza kushanda kwekongiri, kuwedzera kunamatira uye kurebesa nguva yekuisa.
2. Mhedzisiro yeHEMC panguva yekugadzika kongiri
Kunonoka kuseta nguva
Sechigadzirwa che cellulose, HEMC ine nhamba yakawanda yemapoka e-hydrophilic muhutano hwayo hwema molecular, iyo inogona kupindirana nemamolekemu emvura kuti iite hydrates yakagadzikana, zvichiita kuti inonoke sement hydration process kune imwe nzvimbo. Iyo hydration reaction ye simenti ndiyo nzira huru yekusimbisa kongiri, uye kuwedzera kweHEMC kunogona kukanganisa nguva yekumisikidza kuburikidza nenzira dzinotevera:
Kuwedzerwa kwekuchengetedza kwemvura: HEMC inogona kuvandudza zvakanyanya kuchengetwa kwemvura kwekongiri, kunonoka kudonha kwemvura, uye kuwedzera nguva yesamende hydration reaction. Kuburikidza nekuchengetedza mvura, HEMC inogona kudzivisa kurasikirwa kwakanyanya kwemvura, nokudaro kunonoka kuitika kwekutanga uye kwekupedzisira kugadzirisa.
Kuderedza hydration kupisa: HEMC inogona kuvharidzira kudhumhana uye hydration reaction ye simenti particles nekuwedzera viscosity yekrete uye kuderedza kukurumidza kufamba kwemasimende. A yakaderera hydration rate inobatsira kunonoka kuisa nguva kongiri.
Rheological kugadziridzwa: HEMC inogona kugadzirisa rheological zvimiro zvekongiri, kuwedzera viscosity yayo, uye kuchengeta iyo kongiri paste mune yakanaka fluidity mukutanga, kudzivirira matambudziko ekuvaka anokonzerwa nekunyanyisa coagulation.
Kufurira zvinhu
Mhedzisiro yeHEMCpakugadzika nguva haina hukama hwepedyo nedosage, asi zvakare inobatwa nezvimwe zvekunze zvinhu:
Molecular uremu uye dhigirii rekutsiva HEMC: Iyo molecular uremu uye dhigirii rekutsiviwa (iyo dhigirii yekutsiva ethyl uye methyl) yeHEMC ine simba guru pakuita kwayo. HEMC ine huremu hwemamorekuru uye dhigirii yepamusoro yekutsiva inogona kuumba yakasimba network chimiro, ichiratidza zvirinani kuchengetedza mvura uye kukora zvivakwa, saka kunonoka kukonzeresa pakuisa nguva kunonyanya kukosha.
Rudzi rwesimende: Mhando dzakasiyana dzesimende dzine hydration rates dzakasiyana, saka mhedzisiro yeHEMC pane akasiyana simende masisitimu zvakare akasiyana. Ordinary Portland simenti ine kukurumidza hydration rate, nepo imwe yakaderera-inopisa simenti kana yakakosha simende ine inononoka hydration rate, uye basa reHEMC mune izvi masisitimu rinogona kuve rakakurumbira.
Mamiriro ezvakatipoteredza: Mamiriro ezvakatipoteredza akadai sekushisa uye humidity ane simba rinokosha pakugadzirisa nguva yekrete. Kupisa kwepamusoro kuchawedzera hydration reaction ye simenti, zvichiita kuti ipfupise nguva yekuisa, uye mhedzisiro yeHEMC munzvimbo dzekushisa yepamusoro inogona kuderedzwa. Pane zvinopesana, munzvimbo dzakaderera dzekushisa, kunonoka kweHEMC kunogona kuva pachena.
Concentration yeHEMC: Iko kusungirirwa kweHEMC kunotarisa zvakananga dhigirii rekuita kwayo pane kongiri. Kuwedzerwa kwepamusoro kweHEMC kunogona kuwedzera zvakanyanya kuchengetwa kwemvura uye rheology yekrete, nokudaro zvinobudirira kunonoka nguva yekuisa, asi yakawandisa HEMC inogona kukonzera kuderera kwekongiri uye kukanganisa kushanda kwekuvaka.
Synergistic mhedzisiro yeHEMC nemamwe masanganiswa
HEMC inowanzo shandiswa pamwe nemamwe admixtures (akadai semvura inoderedza, retarders, nezvimwewo) kunyatsogadzirisa kushanda kwekongiri. Nekubatirana kwevanodzosa, kuseta kunonoka mhedzisiro yeHEMC inogona kuwedzeredzwa. Semuenzaniso, iyo synergistic mhedzisiro yevamwe vanodzoreredza senge phosphates uye shuga admixtures neHEMC inogona kuwedzera zvakanyanya nguva yekumisikidza kongiri, iyo inokodzera mapurojekiti akakosha munzvimbo dzinopisa kana inoda nguva yakareba yekuvaka.
3. Zvimwe zvinokonzerwa neHEMC pane zvivakwa zvekrete
Mukuwedzera pakunonoka nguva yekuisa, HEMC inewo zvakakosha pane zvimwe zvinhu zvekrete. Semuenzaniso, HEMC inogona kuvandudza fluidity, anti-segregation, kupomba kuita uye kusimba kwekongiri. Paunenge uchigadzirisa nguva yekuisa, kukora uye kuchengetedza mvura mhedzisiro yeHEMC inogonawo kudzivirira zvinobudirira kupatsanurwa kana kubuda ropa kwekongiri, nekuvandudza huwandu hwese uye kugadzikana kwekongiri.
Hydroxyethyl methylcellulose (HEMC) inogona kunyatso kunonoka kumisa nguva yekongiri kuburikidza nekuchengetedza kwayo kwakanaka kwemvura, kukora uye rheological regulation mhedzisiro. Dhigirii resimba reHEMC rinokanganiswa nezvinhu zvakaita sehuremu hwayo, dhigirii rekutsiva, simende rudzi, musanganiswa wekusanganisa uye mamiriro ekunze. Nekutonga zvine musoro kuyerwa uye chikamu cheHEMC, nguva yekumisikidza inogona kukwidziridzwa zvakanaka paunenge uchiona kuvakwa kwekongiri, uye kushanda uye kusimba kwekongiri kunogona kuvandudzwa. Nekudaro, kushandisa zvakanyanya HEMC kunogona kuunza mhedzisiro yakaipa, senge kusanaya kwemvura kana kusakwana hydration, saka inoda kushandiswa nekuchenjerera zvinoenderana nezvinodiwa zveinjiniya.
Nguva yekutumira: Nov-21-2024