Post Date:1,Kubvumbi,2024
Zvinowanzo davirwa kuti kana tembiricha yakakwira, ndipo panobva panyanya masimende kuti adsorbe iyo polycarboxylate inoderedza mvura. Panguva imwecheteyo, iyo tembiricha yakakwira, zvinonyanya kuoneka kuti zvigadzirwa zve simende hydration zvinopedza iyo polycarboxylate inoderedza mvura mumiriri. Pasi pekubatanidzwa kwemaitiro maviri, sezvo kutonhora kunowedzera, fluidity yekrete inowedzera. Iyi mhedziso inogona kunyatsotsanangura chiitiko chekuti fluidity yekongiri inowedzera apo tembiricha inodonha kamwe kamwe, uye kurasikirwa kwekongiri kunowedzera kana tembiricha ichikwira. Zvisinei, panguva yekuvaka, zvakaonekwa kuti fluidity yekrete yakashata pakudzika kwakadzika, uye kana kutonhora kwemvura inosanganiswa kuchiwedzerwa, kunyura kwekrete mushure mokunge muchina wawedzerwa. Izvi hazvigone kutsanangurwa nemhedziso iri pamusoro. Kuti izvi zviitike, zviedzo zvinoitiswa kuongorora, kutsvaga zvikonzero zvekupokana, uye kupa iyo yakakodzera tembiricha renji yekongiri.
Kuti udzidze maitiro ekusanganisa tembiricha yemvura pane yekuparadzira mhedzisiro yepolycarboxylate inoderedza mvura mumiririri. Mvura pa 0°C, 10°C, 20°C, 30°C, uye 40°C yakagadzirirwa zvakateerana kuti simende-superplasticizer ienderane bvunzo.
Ongororo inoratidza kuti kana nguva yekunze-ye-muchina ipfupi, kuwedzera kwesamende slurry kunotanga kuwedzera uye kunoderera sezvo tembiricha inowedzera. Chikonzero chechiitiko ichi ndechekuti tembiricha inokanganisa ese simende hydration rate uye adsorption rate ye superplasticizer. Kana tembiricha yakwira, nekukurumidza iyo adsorption chiyero che superplasticizer mamorekuru, zviri nani mhedzisiro yekuparadzira ichave iri nani. Panguva imwecheteyo, iyo hydration rate ye simenti inokurumidza, uye kushandiswa kwemvura-kuderedza mumiririri ne hydration zvigadzirwa zvinowedzera, izvo zvinoderedza fluidity. Kuwedzera kwekutanga kwesamende paste kunokonzerwa nekubatana kwekuita kwezvinhu zviviri izvi.
Kana tembiricha yemvura inosanganiswa iri ≤10 ° C, iyo adsorption rate ye superplasticizer uye simenti hydration rate zvese zvidiki. Pakati pavo, iyo adsorption yemvura-inoderedza agent pane simenti particles ndiyo inodzora chinhu. Sezvo adsorption yemvura-inoderedza agent pane simenti particles inononoka kana kutonhora kwakadzika, iyo yekutanga yekudzikisa mvura yakaderera, iyo inoratidzwa mune yakaderera yekutanga fluidity ye simenti slurry.
Kana tembiricha yemvura inosanganiswa iri pakati pe20 ne30 ° C, chiyero chekushambadza cheiyo mvura-inoderedza agent uye hydration rate ye simenti inowedzera panguva imwe chete, uye chiyero chekushambadza kwemamorekuru anoderedza mvura inowedzera zvakanyanya. zviri pachena, izvo zvinoratidzwa mukuwedzera kwekutanga fluidity ye simenti slurry. Kana kupisa kwemvura kusanganiswa kuri ≥40 ° C, simiti ye hydration inowedzera zvakanyanya uye zvishoma nezvishoma inova chinhu chinodzora. Nekuda kweizvozvo, iyo mambure adsorption mwero wemvura-inoderedza ejenti mamorekuru (adsorption rate minus yekushandisa rate) inoderera, uye simende slurry inoratidzawo kusakwana kuderedzwa kwemvura. Nokudaro, zvinotendwa kuti kupararira kwekutanga kwemvura inoderedza mumiririri ndiyo yakanakisisa kana mvura inosanganiswa iri pakati pe20 ne30 ° C uye tembiricha yesamende iri pakati pe18 ne22 ° C.
Kana nguva yekubuda-kwe-muchina yakareba, simende yekuwedzera slurry inoenderana nemhedziso inogamuchirwa kazhinji. Kana nguva yakwana, iyo polycarboxylate yekudzikisa mvura inogona kushambadzwa pazvikamu zvesimende patembiricha yega yega kusvika yazara. Zvisinei, pakupisa kwakadzika, mvura shoma inoderedza mvura inoshandiswa kune simenti hydration. Nokudaro, nekufamba kwenguva, kuwedzera kwesement slurry kuchawedzera nekupisa. Wedzera uye kuderedza.
Muedzo uyu haungotarise tembiricha mhedzisiro, asi zvakare unoteerera kune mhedzisiro yenguva pakuparadzira mhedzisiro yepolycarboxylate inoderedza mvura mumiriri, ichiita kuti mhedziso iwedzere kujeka uye kuswedera kune chokwadi cheinjiniya. Mhedziso dzakatorwa ndeidzi:
(1) Pakudziya kwakadzika, kuparadzira mhedzisiro yepolycarboxylate yekudzikisa mvura mumiriri ine nguva iri pachena. Sezvo nguva yekusanganiswa ichiwedzera, fluidity ye simenti slurry inowedzera. Sezvo kutonhora kwemvura inosanganiswa kunowedzera, kuwedzera kwe simenti slurry kunotanga kuwedzera uye kunoderera. Panogona kuve nekusiyana kwakakura pakati pemamiriro ekongiri sezvainobuda mumushini uye mamiriro ekongiri sezvainodururwa panzvimbo.
(2) Munguva yekudzikira-kupisa, kupisa mvura inosanganiswa inogona kubatsira kuvandudza fluidity lag yekongiri. Panguva yekuvaka, kutarisa kunofanira kubhadharwa kune kutonga kwekushisa kwemvura. Kupisa kwesimende slurry iri pakati pe18 ne22 ° C, uye fluidity ndiyo yakanakisisa kana ichibuda mumushini. Dzivirira chiitiko chekuderedzwa kwemvura yekongiri inokonzerwa nekupisa kwemvura kwakanyanya.
(3) Kana nguva yekunze-ye-muchina yakareba, kuwedzera kwesamende slurry kunoderera sezvo tembiricha inowedzera.
Nguva yekutumira: Kubvumbi-01-2024
