This may be the particle shape of additives affected the workability and the continuity of voids of PCs. The PC containing spherical fly ash was easier to compact and coat the voids than the PCs containing angular limestone dust and fine sand. The connected void content tend to reduce and to be less effective in permeability. Moreover, the specific gravity of fly ash is lower than those of limestone dust and fine sand and consequently the PC with fly ash had a slightly higher volume of paste than those.