ABSTRACT
The amount of alkali ions taken up by the hydration products is assumed proportional to its concentration in the solution and the amount of products as adsorbent. The concentration of ions in the solution is calculated from the remaining amount of alkali ions and the volume of solution. An empirical constant, namely the binding factor, is defined and derived both for Na+ and K+. In the computations, the amounts of alkali ions released by the cement hydration and the hydration products are estimated using some empirical equations. The volume of pore solution is computed from the total water content in the paste and that combined in the products. The detailed procedure for predicting the alkali concentrations is as following.
