Comparative Study of Porous Concretes Using Natural and Recycled Aggregates

The purpose of this study was to develop porous concrete with acceptable permeability and strength using recycled aggregate. The optimum mix proportions were employed to prepare porous concretes using natural and recycled aggregates. Tests carried out on porous concrete were void ratio,coefficient of permeability,compressive and flexural strengths. The effects of recycled aggregate on total void ratio,strength and permeability were examined. Styrene butadiene rubber- based redispersible polymer powder and latex were introduced to mixtures to improve strength properties. The total void ratio of porous concrete incorporating recycled aggregate was larger than that of porous concrete with natural aggregate. The addition of polymer modification resulted in a slight decrease in total void ratio regardless of type of aggregate. The compressive strength of porous concrete using recycled aggregate was lower than the one using natural aggregate. However,the compressive strengths of porous concretes using natural and recycled aggregates were significantly improved by 57% and 79% respectively,due to polymer modification. The use of recycled aggregate along with optimum content of polymer could produce porous concrete with both enough drainage and strength properties.