EVALUATION OF PERMEABILITY OF PERVIOUS CONCRETE WITH ADDING FINE AGGREGATE

Pervious concrete was first used in the nineteenth century, but it has only recently begun to increase in popularity. As urban areas expand, the problems associated with runoff management have become more challenging. The main properties to be studied are permeability of pervious concrete. Pervious concrete is produced using 4.75-10 mm size aggregate. For the investigation, cement contents are used in the range from 250-400 kg/m3 at an interval of 50 kg/m3 . The aggregate/cement ratio is kept constant as 4. Also, partial replacement of aggregates by sand is used ranging from 0-20% at an interval of 10%. Three w/c ratios are used as 0.30, 0.35 and 0.40. The measured permeability showed the different results after addition of fine aggregate in it. After adding fine aggregate in pervious concrete permeability decreases. For pervious concrete mix design addition of fine aggregate more than 20% is not suitable. If fine aggregate percentage is more than 20%, it is behaving like the conventional concrete. In previous concrete due to the clogging the blockage of the porous by the clogging material results in the decrease of permeability. Permeability decrease due to the clogging. Permeability is measured after addition of mud in it and results show drastically reduction in permeability with range of 55% to 75%.