Definition, properties & usages of porous concrete
The purpose of porous alias previous concrete is to infiltrate water. Porous signifies the water is permitted to move through.
The concrete having extreme porosity facilitates water from precipitation and other sources to go through directly.
The infiltration strength of the concrete differs from 72 to 500 litres/hrs. In this way, the rain water is saved with effective storm water management.
The porous concrete is best suited for pavements, walkways, parking lots, green houses etc.
The porous concrete comprises of the following elements :-
0% fine aggregates
Cement along with pozzoluna (fly ash)
Voids 15% to 35%
100% coarse aggregates with maximum size of 12.5 mm
Water and admixture
Design mix for 1m3 volume with adherence to 10262 : 2009
Cement (OPC 43) – 20 kg
Fly Ash – 112 kg
Coarse Aggregate (12.5 mm sieve passing) – 1910 kg
Admixture (Naphthalene based) – 0.4% (240 + 112) – 1.50 kg
Water – 170 kg
The properties of porous concrete
Fresh Density – 2425 kg/m3
Infiltration Strength – 450 litres/hourly
Compressive Strength at 7 days – 10 N/mm2
Compressive Strength at 28 days – 15 N/mm2
Video Source: Anime_Edu - Civil Engineering Videos