INFLUENCE OF MIX PROPORTIONS ON PERVIOUS CONCRETE USED IN PAVEMENTS

Abstract

In this research,the effect of using different water-cement ratios (w/c = 0.33, 0.35, and 0.4),different aggregate sizes(MAS= 40,20,14,10 and 5.0)mm., adding different ratios of sand (5,10,and 20)%, as well as,compaction on the strength and permeability of pervious concrete were studied. Test results indicated that, the best w/c ratio was 0.33 for MAS=40,20 and 14 mm., while the best w/c ratios were 0.35 and 0.4 for MAS=10 mm. and 5.0 mm. respectively. In this research we considered a control mix (C:A=1:6, w/c =0.35 and MAS=10 mm permeability = 2 sec) as the optimum mix proportions which it was obtained by trial mixes.It was clear that the best sand ratio was (10%). Results also indicated that, when adding 0.5% super-plastizer of cement weight, increase compressive strength. Finally adding sand with super-plastizer increase compressive strength but reduce permeability.