Fundamental Study on Properties of Small Particle Size Porous Concrete

In the present research, the influence of aggregate size on various characteristics (strength, permeability, water retention and water wicking) of small particle size porous concrete was examined. The properties of small particle size porous concrete using small size crushed stone (particle size: 0.6-1.2, 1.2-2.5 mm) were compared with those of ordinary porous concrete using ordinary size crushed stone (5-13 mm). According to the test results, compressive strength of porous concrete was not influenced to a significant degree by aggregate size, while flexural strength became higher with decreasing particle size. Also, it was shown that small particle size porous concrete is superior in water retention and wicking compared to ordinary particle size porous concrete. It should be noted, however, that permeability of small particle size porous concrete was rather low. Further, clarifying the configuration of voids in the porous concrete is essential for the quantitative discussion on the behaviors of water in porous concrete.