Uphuhliso kunye nokusetyenziswa kwepolycarboxylic superplasticizerikhawuleza ngokwentelekiso. Ngokukodwa kwiiprojekthi ezinkulu kunye nezingundoqo ezifana nokugcinwa kwamanzi, amandla ombane, ubunjineli behydraulic, ubunjineli baselwandle, kunye neebhulorho, i-polycarboxylate superplastisizer isetyenziswa ngokubanzi.
Emva kokuba i-samente ixutywe namanzi, i-cement slurry yenza isakhiwo se-flocculation ngenxa ye-gravity ye-molecular of particles ye-cement, ukwenzela ukuba i-10% ukuya kwi-30% yamanzi okuxuba ihlanganiswe kwiincinci ze-samente kwaye ayikwazi ukuthatha inxaxheba ekuhambeni kwamahhala kunye ne-lubrication. , ngaloo ndlela ichaphazela i-Flowability yomxube wekhonkrithi. Xa i-supreplasticizer yongezwa, iimolekyuli ze-agent yokunciphisa amanzi zinokubhengezwa kwinqanaba leengqungquthela zesamente, ukwenzela ukuba iindawo ze-samente zibe nentlawulo efanayo (ngokuqhelekileyo intlawulo embi), yenze i-electrostatic repulsion, ekhuthaza ukuhlangana. ukusasazeka kweengqungquthela zesamente kunye nokutshatyalaliswa kwesakhiwo se-flocculation. , ukukhulula inxalenye yamanzi asongiweyo ukuba athathe inxaxheba ekuhambeni, ngaloo ndlela ukwandisa ngokufanelekileyo umbane womxube wekhonkrithi.
Iqela le-hydrophilic kwii-arhente yokunciphisa amanzii-polar kakhulu, ngoko ke ifilimu ye-adsorption ye-agent yokunciphisa amanzi kumphezulu wamasuntswana e-samente ingenza ifilimu ezinzileyo yamanzi edibeneyo kunye ne-molecule yamanzi. Le filimu yamanzi inefuthe elihle lokuthambisa kwaye inokunciphisa ngokufanelekileyo ukuxhatshazwa kwe-sliding phakathi kweengqungquthela zesamente, ngaloo ndlela iphucula ngakumbi umbane wodaka kunye nekhonkrithi.
Ikhonkco le-hydrophilic branched kwisuperplasticizerUlwakhiwo lunwebeka kwisisombululo esinamanzi, ngaloo ndlela senza umaleko we-hydrophilic-dimensional adsorption kunye nobukhulu obuthile kumphezulu wamasuntswana e-samente adsorbed. Xa iinqununu ze-samente zisondele komnye nomnye, i-adsorption layers iqala ukugqithisa, oko kukuthi, ukuphazamiseka kwe-steric kwenzeka phakathi kweengqungquthela ze-samente. Ukugqithisa okungaphezulu, ukunyanzeliswa okukhulu kwe-steric, kunye nokuphazamiseka okukhulu kokubambisana phakathi kweengqungquthela zesamente, okwenza udaka kunye nekhonkrithi I-Slump ihlala ilungile.
Ngexesha lokulungiselela inkqubo yei-agent yokunciphisa amanzi e-polycarboxylate, ezinye iintambo ezinamagatsha zixutywe kwiimolekyuli ze-agent yokunciphisa amanzi. Le khonkco ye-branched ayinikezeli kuphela impembelelo yokuthintela i-steric, kodwa kwakhona, kwindawo ephezulu ye-alkalinity ye-cement hydration, Ikhonkco yesebe inokunqunyulwa ngokukhawuleza, ngaloo ndlela ikhulule i-polycarboxylic acid kunye ne-dispersing effect, enokuphucula i-dispersion effect ye-cement particles kunye. lawula ilahleko yokuwa.
Ixesha lokuposa: Mar-29-2024