Mumakore achangopfuura, nekuvandudzwa kuri kuitwa tekinoroji yekudzivirira madziro ekunze, kufambira mberi kuri kuitwa tekinoroji yekugadzira cellulose, uye hunhu hwakanaka hweHPMC pachayo, HPMC yave ichishandiswa zvakanyanya muindasitiri yekuvaka.
Kuti tiongorore zvakanyanya mashandiro anoita HPMC nezvinhu zvakagadzirwa nesimende, bepa iri rinotarisa pakuvandudzwa kweHPMC pahunhu hwakabatana hwezvinhu zvakagadzirwa nesimende.
nguva yekugwamba kweropa
Nguva yekugadzika kwekongiri inonyanya kuenderana nenguva yekugadzika kwesimende, uye aggregate haina simba guru, saka nguva yekugadzika kwekongiri inogona kushandiswa pachinzvimbo chekudzidza simba reHPMC panguva yekugadzika kwemusanganiswa wekongiri usingaparadzike pasi pemvura, nekuti nguva yekugadzika kwekongiri inokanganiswa nemvura. Saka, kuti tiongorore simba reHPMC panguva yekugadzika kwekongiri, zvakakosha kugadzirisa chiyero chemvura nesimende uye chiyero chekongiri chekongiri.
Sekureva kwekuyedza, kuwedzerwa kweHPMC kune simba guru rekudzora musanganiswa wemota, uye nguva yekugadzika kwemota inowedzera zvakateerana nekuwedzera kwehuwandu hweHPMC. Pasi pehuwandu hwakafanana hweHPMC, mota yakaumbwa pasi pemvura inokurumidza kupfuura mota yakaumbwa mumhepo. Nguva yekugadzika yepakati pemota yakareba. Kana ikayerwa mumvura, zvichienzaniswa nemuenzaniso usina chinhu, nguva yekugadzika yemota yakasanganiswa neHPMC inononoka nemaawa 6-18 ekuisa pakutanga uye maawa 6-22 ekuisa kwekupedzisira. Saka, HPMC inofanira kushandiswa pamwe chete nema accelerators.
HPMC ipolymer ine mamorekuru akawanda ine chimiro che macromolecular linear uye hydroxyl group paboka rinoshanda, iro rinogona kuumba hydrogen bonds nemamorekuru emvura anosanganiswa uye kuwedzera viscosity yemvura inosanganiswa. Maketani marefu e HPMC anokwezvana, zvichiita kuti mamorekuru e HPMC asanganiswe kuti agadzire chimiro che network, achiputira simende uye achisanganisa mvura. Sezvo HPMC ichiumba chimiro che network chakafanana nefirimu uye ichiputira simende, inodzivirira mvura mu mortar, uye inodzivisa kana kuderedza mwero we hydration yesimende.
Kubuda ropa
Kubuda ropa kwedhaka rakaita sekongiri, izvo zvinozokonzera kugadzikana kwakakomba, zvichikonzera kuwedzera kwehuwandu hwemvura nesimende yedhaka repamusoro, zvichikonzera kupwanyika kukuru kwedhaka repamusoro pakutanga, uye kutotsemuka, uye simba redhaka repamusoro redhaka rakatetepa.
Kana dose iri pamusoro pe0.5%, hapana kubuda ropa kunoitika. Izvi zvinodaro nekuti kana HPMC ikasanganiswa mumota, HPMC ine chimiro chekugadzira mafirimu uye network, uye kunyudzwa kwemapoka ehydroxyl pacheni refu yemacromolecule kunoita kuti simende uye mvura inosanganiswa mumota iite flocculation, zvichiita kuti chimiro chemota chigadzikane. Mushure mekuwedzera HPMC mumota, mabhurumu madiki akawanda emhepo anoumbwa. Mabhurumu aya emhepo achagoverwa zvakaenzana mumota uye anodzivisa kuiswa kweaggregate. Kushanda kwehunyanzvi kweHPMC kune simba guru pazvinhu zvakagadzirwa nesimende, uye inowanzoshandiswa kugadzira zvinhu zvitsva zvakagadzirwa nesimende zvakaita semota yakaoma nehupfu uye polymer, kuitira kuti ive nekuchengetedza kwakanaka kwemvura uye kuchengetedza purasitiki.
Kudiwa kwemvura yedhaka
Kana huwandu hweHPMC huri hudiki, hune simba guru pakuda kwemvura kwemota. Kana huwandu hwekuwedzera hwemota itsva huchiramba hwakafanana, huwandu hweHPMC uye kudiwa kwemvura kwemota zvinochinja muhukama hwakatsetseka mukati menguva yakati, uye kudiwa kwemvura kwemota kunotanga kwaderera uye kwozowedzera pachena. Kana huwandu hweHPMC huri pasi pe0.025%, nekuwedzera kwehuwandu, kudiwa kwemvura kwemota kunoderera pasi pekuwedzera kwakafanana, izvo zvinoratidza kuti kana huwandu hweHPMC huri hudiki, hune simba rekuderedza mvura pamota, uye HPMC ine simba rekupinda mumhepo. Kune huwandu hwakawanda hwemabubble emhepo akazvimiririra mumota, uye mabubble emhepo aya anoshanda semafuta ekuvandudza kuyerera kwemota. Kana chiyero chiri chikuru kupfuura 0.025%, kudiwa kwemvura kwemota kunowedzera nekuwedzera kwechiyero. Izvi zvinodaro nekuti chimiro chenetwork cheHPMC chakazara, uye mukaha uri pakati pemaflocs ari pa long molecular chain unopfupikiswa, izvo zvine simba rekukwezvana uye kubatana, uye zvinoderedza kuyerera kwemortar. Saka, kana mwero wekuwedzera wakafanana, slurry inoratidza kuwedzera kwekudiwa kwemvura.
01. Kuedza kuramba kupararira:
Kudzivirira kupararira kwemvura chinhu chakakosha pakuongorora kunaka kwemushonga unodzivirira kupararira kwemvura. HPMC ipolymer inonyungudika mumvura, inozivikanwawo se resin inonyungudika mumvura kana polymer inonyungudika mumvura. Inowedzera kuenderana kwemusanganiswa nekuwedzera viscosity yemvura inosanganiswa. Ipolymer ipolymer inonyungudika inogona kunyungudika mumvura kuti igadzire mhinduro.
Ongororo dzinoratidza kuti kana huwandu hwe naphthalene-based high-efficiency superplasticizer hukawedzera, kuwedzerwa kwe superplasticizer kunoderedza kuramba kwekupararira kwemota yesimbi yakasanganiswa. Izvi zvinodaro nekuti naphthalene-based high-efficiency water reducer i surfactant. Kana mvura yekuderedza mvura yawedzerwa kumota, mvura yekuderedza mvura inozotariswa pamusoro pezvikamu zvesimende kuti pamusoro pezvikamu zvesimende pave nechaji imwe chete. Kudzoserwa kwemagetsi uku kunoita kuti zvikamu zvesimende zviumbwe. Chimiro chesimende chinopwanyika, uye mvura yakaputirwa muchimiro chinoburitswa, izvo zvinokonzeresa kurasikirwa kwechikamu chesimende. Panguva imwe chete, zvakaonekwa kuti nekuwedzera kwehuwandu hweHPMC, kuramba kwekupararira kwemota yesimbi itsva yesimbi kuri kuwedzera.
02. Hunhu hwesimba rekongiri:
Muchirongwa chekutanga chekugadzira hwaro, HPMC yakasanganiswa nekongiri isinganyunguduke pasi pemvura, uye simba rekugadzira raive C25. Zvichienderana nekuyedza kwekutanga, huwandu hwesimende i400kg, fume ye silica yakasanganiswa i25kg/m3, huwandu hwakakwana hweHPMC i0.6% yehuwandu hwesimende, chiyero chemvura nesimende i0.42, mwero wejecha i40%, uye kubuda kwe naphthalene-based high-efficiency water reduction ndiko Huwandu hwesimende i8%, avhareji yesimba re28d rekongiri mumhepo i42.6MPa, avhareji yesimba re28d rekongiri iri pasi pemvura ine 60mm kukwirira i36.4MPa, uye chiyero chesimba rekongiri yakagadzirwa nemvura kune kongiri yakagadzirwa nemhepo i84.8%, mhedzisiro yacho yakanyanya kukosha.
03. Kuedza kunoratidza:
(1) Kuwedzerwa kweHPMC kune mhedzisiro yakajeka yekunonoka pamusanganiswa wedhaka. Nekuwedzera kwehuwandu hweHPMC, nguva yekugadzika kwedhaka inowedzera zvakateerana. Pasi pehuwandu hwakafanana hweHPMC, dhaka rinoumbwa pasi pemvura rinokurumidza kupfuura rinoumbwa mumhepo. Nguva yekugadzika kwepakati pekugadzira irefu. Chinhu ichi chinobatsira pakupomba kongiri pasi pemvura.
(2) Mota yesimbi yakasanganiswa nehydroxypropyl methylcellulose ine hunhu hwakanaka hwekubatana uye haina kana kubuda ropa.
(3) Huwandu hweHPMC uye kudiwa kwemvura kwedhaka zvakatanga zvadzikira uye zvakazowedzera zviri pachena.
(4) Kushandiswa kwechinhu chinodzikisa mvura kunovandudza dambudziko rekuwedzera kwekuda kwemvura yedhaka, asi chiyero chayo chinofanira kudzorwa zvine mwero, zvikasadaro kuramba kupararira kwedhaka resimende richangobva kusanganiswa pasi pemvura dzimwe nguva kunoderedzwa.
(5) Hapana musiyano mudiki pachimiro pakati pemuenzaniso we simende yakasanganiswa neHPMC nemuenzaniso usina chinhu, uye hapana musiyano mudiki pachimiro uye huwandu hwemuenzaniso we simende yakadururwa mumvura nemumhepo. Muenzaniso wakagadzirwa pasi pemvura kwemazuva makumi maviri nemasere wakapfava zvishoma. Chikonzero chikuru ndechekuti kuwedzerwa kweHPMC kunoderedza zvakanyanya kurasikirwa nekupararira kwesimende pakudururwa mumvura, asiwo kunoderedza kuoma kwedombo resimende. Muchirongwa ichi, pasi pemamiriro ekuona kuti mhedzisiro yekusapararira pasi pemvura haishande, chiyero cheHPMC chinofanira kuderedzwa zvakanyanya sezvinobvira.
(6) Kuwedzera HPMC pasi pemvura isinganyunguduke concrete, kudzora chiyero kunobatsira kusimba kwayo. Chirongwa chekutanga chinoratidza kuti chiyero chesimba reconcrete yakagadzirwa nemvura neconcrete yakagadzirwa nemhepo i84.8%, uye mhedzisiro yacho yakakosha.
Nguva yekutumira: Chivabvu-06-2023