Investigating the Effect of kind of aggregate on strength and permeability of concrete

Permeability is one of the most important factors affecting in the durability of concrete. So in this article, the effect of concrete strength, water absorption, density and strength of rock on the permeability of concrete studied. In the Studied concrete used separately from eight type’s rock with different characteristics namely silica stone, marble, andesite, limestone, travertine, tuff, dense tuff, granite. To determine the permeability of concrete used “cylindrical chamber” method. Also, to study the strength of concrete and rock used the “Twist-off” and uniaxial compressive strength methods. The results shown that the relationship between concrete strength and permeability of concrete with correlation between 0.67 to 0.77 is over than the correlation of other factors such as water absorption, density and strength of rock. Also, the concrete made with the travertine aggregates had highest and the concrete made with the granite aggregates concrete had lowest amount of water permeability. The Concrete made with dense tuff and marble aggregates had the relatively similar conditions in the amount of water permeability. Also, studies show that the permeability of concrete resulted from andesite and tuff aggregates is similar. Permeability of The concrete made with limestone aggregates was 11.8 times of permeability of concrete made with granite aggregates.