Pore solution composition of calcium sulfoaluminate cement

The chemical compositions of the pore solution expressed from commercial calcium sulfoaluminate-belite cement paste at selected intervals of 1, 3, 7, 14, 30 and 60 days, cured at 20°C, have been determined. pH was measured in the range 12-8 13-1; changes in concentrations of Na, K, Ca, Al, Si, Cl, Br and S04(2-) were determined between I and 60 days of curing. The main components in the pore solution were Al and K: Na, Ca, Cl, Br and SO4(2-) concentrations were low, and the Si concentration was below the detection limit. Potassium is slowly sorbed by the solids, and its concentration passes through a maximum at ~ 3 days.