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.