Lapho i-polycarboxylic acid-based high-efficiency superplasticizer (i-ejenti yokunciphisa amanzi) yengezwe ngenani lika-0.2% kuya ku-0.3% wesisindo se-cementitious material, izinga lokunciphisa amanzi lingaba phezulu ku-25% kuya ku-45%. Ngokuvamile kunenkolelo yokuthi i-ejenti yokunciphisa amanzi esekelwe ku-polycarboxylic acid esebenza kahle kakhulu inesakhiwo esimise okwekama, esikhiqiza umphumela ovimbelayo ngokukhangisa ezinhlayiyeni zikasimende noma emikhiqizweni ye-cement hydration, futhi idlala indima ekuhlakazeni nasekugcineni ukuhlakazwa kukasimende. Ucwaningo lwezimpawu zokukhanga zama-ejenti anciphisa amanzi endaweni yezinhlayiya ze-gypsum kanye nendlela yazo yokusabalalisa i-adsorption-dispersion lubonise ukuthi i-polycarboxylic acid esekelwe ekusebenzeni kahle okuphezulu kwe-ejenti yokunciphisa amanzi i-adsorption emise okwekama, enenani elincane lokukhangisa endaweni ye-gypsum ye-electrostatic kanye nomthelela obuthakathaka. Umthelela wayo wokuhlakaza uvela ikakhulukazi kumphumela wesithiyo esiqinile wesendlalelo se-adsorption. I-dispersibility ekhiqizwa umphumela we-steric hindrance akuthintwa kancane yi-hydration ye-gypsum, futhi ngaleyo ndlela iba nokuzinza okuhle kokuhlakazeka.
Usimende unomphumela wokuthuthukisa ukusetha ku-gypsum, okuzosheshisa isikhathi sokusetha se-gypsum. Uma umthamo udlula u-2%, uzoba nomthelela omkhulu ku-fluidity yakuqala, futhi i-fluidity izowohloka ngokunyuka kwesilinganiso sikasimende. Njengoba usimende unomphumela wokuthuthukisa i-gypsum, ukuze kuncishiswe umthelela wesikhathi sokumisa i-gypsum ku-gypsum fluidity, inani elifanele le-gypsum retarder liyengezwa ku-gypsum. I-fluidity ye-gypsum iyanda ngokunyuka kwesilinganiso sikasimende; ukwengezwa kukasimende kwandisa i-alkalinity yesistimu, okwenza isinciphisi samanzi sihlukanise ngokushesha futhi ngokugcwele ohlelweni, futhi umphumela wokunciphisa amanzi uthuthukiswa kakhulu; ngesikhathi esifanayo, njengoba isidingo samanzi sikasimende ngokwaso siphansi, silingana nokwandisa isilinganiso samanzi-samente ngaphansi kwenani elifanayo lokwengezwa kwamanzi, okuzophinde kwandise uketshezi kancane.
Isinciphisi samanzi se-Polycarboxylate sinokuhlakazeka okuhle kakhulu futhi singathuthukisa kakhulu uketshezi lwegypsum ngethamo eliphansi uma kuqhathaniswa. Ngokukhuphuka komthamo, i-fluidity ye-gypsum ikhula kakhulu. Isinciphisi samanzi se-Polycarboxylate sinomphumela onamandla wokuhlehlisa. Ngokukhuphuka komthamo, isikhathi sokusetha sikhula kakhulu. Ngomphumela onamandla wokubambezeleka we-polycarboxylate water reducer, ngaphansi kwesilinganiso esifanayo samanzi-to-simende, ukwanda komthamo kungase kubangele ukuguquguquka kwamakristalu e-gypsum kanye nokuxegiswa kwe-gypsum. Amandla aguquguqukayo futhi acindezelayo e-gypsum ayancipha ngokunyuka komthamo.
I-Polycarboxylate ether enciphisa amanzi ejenti ibambezela ukumiswa kwe-gypsum futhi inciphisa amandla ayo. Ngesilinganiso esifanayo, ukwengeza usimende noma i-calcium oxide ku-gypsum kuthuthukisa uketshezi kwayo. Lokhu kwehlisa isilinganiso samanzi kuya kusimende, kwandisa ukuminyana kwe-gypsum, futhi ngaleyo ndlela amandla ayo. Ngaphezu kwalokho, umphumela wokuqiniswa kwemikhiqizo ye-cement hydration ku-gypsum yandisa amandla ayo okuguquguquka nokucindezelwa. Ukwandisa inani likasimende ne-calcium oxide kwandisa uketshezi lwe-gypsum, futhi inani elifanele likasimende lingathuthukisa kakhulu amandla ayo.
Uma usebenzisa i-polycarboxylate ether yokunciphisa amanzi e-gypsum, ukwengeza inani elifanele likasimende akukhulisi nje kuphela amandla alo kodwa futhi kunikeza uketshezi olukhulu olunomthelela omncane ngesikhathi saso sokusetha.
Isikhathi sokuthumela: Aug-06-2025