A Quantachrome PoreMaster 33 mercury intrusion porosimeter was used to assess the internal void system of the samples. The concrete samples for evaluating porosity were prepared as per ASTM D 4404-10. Broken pieces of concrete were used to make the specimen for the test. It is on the principle that the mercury does not wet the surface of most of substances, and will not penetrate by itself into the pores by capillary action. By applying an external