Abstract
This paper deals with the strength development, pore structure development, rapid chloride permeability and water permeability of alkali-activated slag mortars activated by 6% (by mass of Na 2O) NaOH, Na 2CO 3 and Na 2SiO 3. The Na 2SiO 3-activated slag mortars exhibited the highest strength at both early and later ages, even much higher than a typical commercial Type III portland cement. NaOH-activated slag mortars exhibited the lowest strength. The pore structure measurements were consistent with strength results. Four common strength-porosity equations: Balshin's, Ryshkevitch's, Schiller's, and Hasselmann's equations, fit the experimental results from alkali-activated slag mortars with sufficient efficiency; of which Hasselmann's equation fit best. The charge passed through the mortar specimens in the rapid chloride ion permeability test appeared to be dependent more on the chemistry of pore solution than on the pore structure of the mortars. Limited results from water permeability testing appeared to be consistent with strength and pore structure measurements.
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