Nguva yekuisa kongiri chinhu chakakosha chinokanganisa kunaka kwekuvaka uye kufambira mberi. Kana nguva yekuisa kongiri yakareba zvakanyanya, zvinogona kutungamira kunonoka kwekufambira mberi kwekuvaka uye kukanganisa kunaka kwekongiri; kana nguva yekuisa kongiri iri pfupi zvakanyanya, zvinogona kutungamira kumatambudziko mukuvaka kongiri uye kukanganisa mhedzisiro yekuvaka kwepurojekiti. Kuti tigadzirise nguva yekuisa kongiri, kushandiswa kwezvisanganiswa kwave nzira yakajairika mukugadzira kongiri yemazuva ano.Hydroxyethyl Methyl Cellulose (HEMC), sechinhu chinowanzo shandiswa mu cellulose derivative, chinoshandiswa zvakanyanya mu concrete admixtures uye chinogona kukanganisa rheology, kuchengetedza mvura, nguva yekuisa uye zvimwe zvinhu zve concrete.1. Hunhu hwepakutanga hweHEMC
HEMC i cellulose yakagadziriswa, inowanzogadzirwa kubva ku cellulose yechisikigo kuburikidza ne ethylation uye methylation reactions. Ine hunhu hwakanaka hwekunyunguduka kwemvura, kukora, kuchengetedza mvura uye gelling, saka inoshandiswa zvakanyanya mukuvaka, machira, makemikari ezuva nezuva nedzimwe nzvimbo. Mukongiri, HEMC inowanzo shandiswa sechinhu chinosimbisa, chinochengetedza mvura uye chinodzora rheology, izvo zvinogona kuvandudza kushanda kwekongiri, kuwedzera kunamira uye kuwedzera nguva yekugadzika.
2. Mhedzisiro yeHEMC panguva yekuisa kongiri
Kunonotsa nguva yekuisa
Sechinhu chinobva mu cellulose, HEMC ine huwandu hwakawanda hwemapoka anonyungudika mumvura muchimiro chayo chemamorekuru, ayo anogona kusangana nemamorekuru emvura kuti agadzire mahydrate akagadzikana, nokudaro zvichinonotsa maitiro emvura inonyungudika nesimende kusvika pamwero wakati. Kunyungudika kwesimende ndiyo nzira huru yekusimba kwekongiri, uye kuwedzerwa kweHEMC kunogona kukanganisa nguva yekuiswa kwayo nenzira dzinotevera:
Kuchengetedza mvura zvakanyanya: HEMC inogona kuvandudza zvakanyanya kuchengetedza mvura yekongiri, kuderedza mwero wekubuda kwemvura, uye kuwedzera nguva yekunyoroveswa kwemvura nesimende. Kuburikidza nekuchengetedza mvura, HEMC inogona kudzivirira kurasikirwa nemvura zvakanyanya, nokudaro ichinonotsa kuitika kwemamiriro ekutanga neokupedzisira.
Kuderedza kupisa kwemvura: HEMC inogona kudzivirira kugongana uye kunyorova kwezvikamu zvesimende nekuwedzera kusimba kwekongiri uye kuderedza kumhanya kwekufamba kwezvikamu zvesimende. Kunyorova kwakaderera kunobatsira kunonotsa nguva yekuisa kongiri.
Kugadziriswa kwe rheological: HEMC inogona kugadzirisa hunhu hwe rheological hwekongiri, kuwedzera viscosity yayo, uye kuchengetedza paste yekongiri iri mukuyerera kwakanaka pakutanga, kudzivirira matambudziko ekuvaka anokonzerwa nekuwanda kwe coagulation.
Zvinhu zvinopesvedzera
Mhedzisiro yeHEMCKuisa nguva hakungobatanidzwi chete nechiyero chayo, asiwo kunokonzerwa nezvimwe zvinhu zvekunze:
Kurema kwemamorekuru uye mwero wekutsiva HEMC: Kurema kwemamorekuru uye mwero wekutsiva (mwero wekutsiva ethyl nemethyl) yeHEMC zvine simba guru pakushanda kwayo. HEMC ine huremu hwakawanda hwemamorekuru uye mwero wekutsiva wakakwira inogona kuumba chimiro chakasimba chenetwork, ichiratidza kuchengetedza mvura zviri nani uye hunhu hwekukora, saka kunonoka kwemhedzisiro panguva yekuisa kwakakosha zvikuru.
Rudzi rwesimende: Mhando dzakasiyana dzesimende dzine mwero wemvura yakasiyana, saka mhedzisiro yeHEMC pamasisitimu akasiyana esimende yakasiyanawo. Simende yePortland yakajairika ine mwero wemvura unokurumidza, nepo imwe simende inopisa zvishoma kana simende yakakosha ine mwero wemvura unononoka, uye basa reHEMC mumasisitimu aya rinogona kuve rakakurumbira.
Mamiriro ekunze: Mamiriro ekunze akadai sekupisa uye hunyoro ane simba guru pakuiswa kwekongiri. Kupisa kwakanyanya kuchakurumidzisa kunyorova kwesimende, zvichikonzera kuti nguva yekuiswa ipfupike, uye mhedzisiro yeHEMC munzvimbo dzinopisa zvakanyanya inogona kuderedzwa. Kusiyana neizvi, munzvimbo dzinopisa zvishoma, mhedzisiro yekunonoka yeHEMC inogona kuve pachena.
Kuwanda kweHEMC: Kuwanda kweHEMC kunotarisa zvakananga mwero wesimba rayo pakongiri. Kuwanda kweHEMC kunogona kuwedzera zvakanyanya kuchengetwa kwemvura uye rheology yekongiri, nokudaro zvichinonotsa nguva yekuiswa kwayo, asi HEMC yakawandisa inogona kukonzera kusafamba zvakanaka kwekongiri uye kukanganisa mashandiro ekuvaka.
Mhedzisiro yeHEMC pamwe chete nezvimwe zvinhu zvakasanganiswa
HEMC inowanzo shandiswa pamwe chete nezvimwe zvinhu zvinosanganiswa (zvakaita sezvinoderedza mvura, zvinoderedza simba, nezvimwewo) kugadzirisa mashandiro ekongiri. Nekubatsirana kwezvinoderedza simba, HEMC inogona kuwedzera simba rekuisa kongiri. Semuenzaniso, kushanda pamwe chete kwezvimwe zvinhu zvinoderedza simba zvakaita sephosphates uye shuga neHEMC kunogona kuwedzera nguva yekuisa kongiri, iyo yakakodzera mapurojekiti chaiwo munzvimbo dzinopisa kana dzinoda nguva yakareba yekuvaka.
3. Mimwe migumisiro yeHEMC pahunhu hwekongiri
Pamusoro pekunonotsa nguva yekugadzika, HEMC inewo simba guru pane zvimwe zvinhu zvekongiri. Semuenzaniso, HEMC inogona kuvandudza kuyerera kwekongiri, kudzivirira kupatsanurwa, kushanda kwepombi uye kugara kwenguva refu kwekongiri. Nepo ichigadzirisa nguva yekugadzika, kukora uye kuchengetedza mvura kweHEMC kunogonawo kudzivirira kupatsanurwa kana kubuda ropa kwekongiri, uye kuvandudza kunaka kwekongiri yese.
Hydroxyethyl methylcellulose (HEMC) inogona kunonotsa nguva yekugadzika kwekongiri kuburikidza nekuchengetwa kwayo kwemvura zvakanaka, kukora kwayo uye mhedzisiro yayo yekutonga kwerheological. Huremu hwesimba reHEMC hunokanganiswa nezvinhu zvakaita sehuremu hwayo hwemamorekuru, huwandu hwekutsiva, rudzi rwesimende, musanganiswa wemusanganiswa uye mamiriro ekunze. Nekudzora mwero uye huwandu hweHEMC zvine mwero, nguva yekugadzika inogona kuwedzerwa zvinobudirira ukuwo ichiita kuti kongiri ishande zvakanaka, uye kushanda uye kugara kwenguva refu kwekongiri kunogona kuvandudzwa. Zvisinei, kushandiswa zvakanyanya kweHEMC kunogonawo kuunza mhedzisiro yakaipa, senge kusashanda zvakanaka kwemvura kana kushaya mvura yakakwana, saka inofanirwa kushandiswa nekungwarira zvichienderana nezvinodiwa chaizvo zveinjiniya.
Nguva yekutumira: Mbudzi-21-2024