Mhedzisiro yeRedispersible Emulsion Powder pane Slurry Structure

Redispersible latex poda inowanzoshandiswa organic gelling material inowanikwa nekupfapfaidza-kuomesa emulsion yepolymer ine polyvinyl doro seyekudzivirira colloid. Inogona kuparadzirwa zvakare zvakaenzana mumvura kuti iite emulsion kana ikasangana nemvura. Kuwedzera redispersible latex poda inogona kuvandudza mashandiro eichangobva kusanganiswa simende dhaka.

Pangosvika simende-based material yakawedzerwa ne latex powder inosangana nemvura, iyo hydration reaction inotanga, uye calcium hydroxide solution inokurumidza kusvika pakuzara uye makristasi anonaya, uye panguva imwe chete, ettringite crystals uye calcium silicate hydrate gels inoumbwa. Izvo zvimedu zvakasimba zvinoiswa pajeri uye unhydrated sement particles. Sezvo hydration reaction inoenderera mberi, zvigadzirwa zve hydration zvinowedzera, uye zvimedu zvepolymer zvishoma nezvishoma zvinoungana mumacapillary pores, zvichigadzira dhizaini yakarongedzwa pamusoro peiyo gel uye pane isina mvura simende masimende. Iyo yakaunganidzwa yepolymer particles zvishoma nezvishoma inozadza pores, asi kwete zvachose kusvika mukati mepamusoro pema pores. Sezvo mvura inowedzera kuderedzwa ne hydration kana kuomeswa, iyo yakavharwa yakazara polymer particles pa gel uye mu pores coalesce kuva inoenderera firimu, kuumba inopindirana musanganiswa ne hydrated simende paste uye kunatsiridza hydration Bonding yezvigadzirwa uye aggregates.

Nekuti zvigadzirwa zve hydration zvine mapolymers zvinogadzira chivharo chekuvhara pane iyo interface, inogona kukanganisa kukura kwe ettringite uye coarse calcium hydroxide crystals; uye nekuti mapolymers anonamira mumafirimu mumapores eiyo interface transition zone, iyo polymer simende-yakavakirwa zvinhu Iyo yekuchinja zone yakaoma. Iwo mapoka anoshanda mune mamwe mapolymer mamorekuru anozogadzirawo machinjiro ekubatanidza neCa2+ uye A13+ mune simende hydration zvigadzirwa kuti aumbe akakosha mabhondi ebhiriji, anonatsiridza chimiro chemuviri wezvakaomeswa simende-based zvinhu, kuderedza kushushikana kwemukati, uye kuderedza chizvarwa che microcracks.

Sezvo simende gel chimiro chinokura, mvura inopedzwa uye zvikamu zvepolymer zvishoma nezvishoma zvinovharirwa mumapores. Sezvo simende ichiwedzera hydrated, hunyoro huri mu capillary pores hunodzikira, uye zvimedu zvepolymer zvinoungana pamusoro pesimende hydration chigadzirwa gel / unhydrated simende particle musanganiswa uye aggregate, nokudaro achigadzira inoenderera yakavharwa-yakazara layer ine mapores makuru Akazadzwa. ine zvimedu zvinonamira kana kuzvinamira zvepolymer.

Iyo yakapararira emulsion ye redispersible latex powder inogona kuumba mvura-insoluble inoramba iine firimu (polymer network body) mushure mekuoma, uye iyi yakaderera elastic modulus polymer network body inogona kuvandudza kushanda kwe simenti; panguva imwecheteyo, mupolymer molecule Mamwe mapoka epolar musimende anoita kemikari nesimende hydration zvigadzirwa kugadzira mabhiriji akakosha, anovandudza chimiro chesimende hydration zvigadzirwa, uye kuderedza uye kuderedza chizvarwa chekutsemuka. Mushure mekunge iyo redispersible latex powder yawedzerwa, iyo yekutanga hydration rate ye simenti inononoka, uye iyo polymer firimu inogona kupeta zvishoma kana kunyatsoputira masimende, kuitira kuti simiti inyatso hydrated uye zvinhu zvayo zvakasiyana zvinogona kuvandudzwa.