Abstract
In this paper, gas permeability of high performance concrete (HPC) with water-binder ratio (w/b) varying from 0.25 to 0.35 and level of fly ash (FA) replacement ranging from 0% to 60%, were determined. Pore structure of high performance concrete was also investigated with mercury intrusion porosimetry (MIP). It showed that w/b ratio was found to have a varying influence on gas permeability. In this research, it achieved higher gas permeability at w/b of 0.30 than that at w/b of 0.25 or 0.35. The incorporation of fly ash increased the gas permeability of HPC. There’s a better interdependence between gas permeability and porosity than that between gas permeability and threshold diameter and mean diameter, respectively.
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