Effect of Sustainable Materials on Some Properties of Pervious Concrete

Recycling and sustainability are important topics nowadays due to the increased environmental problems and waste accumulation. In this research, focus was given on the production of sustainable pervious concrete. Four mixes were prepared: a reference mixture, a mixture with 30% of the volume of coarse aggregates replaced with ceramic waste, the third mixture was similar to the second, but it contained 10% metakaolin instead of cement, and the fourth mixture was similar to the third, but carbon fibers were added. Thermal conductivity and density tests were carried out after 28 days of curing on the casting samples, while flexural tests were performed after 7 and 28 days. The results showed that flexural strength, density, and thermal conductivity were decreased in the second and third mixtures compared to the reference mixture, but in different decreasing percentages, so the good effect of metakaolin became clear. The addition of carbon fibers to the fourth mixture led to an increase in flexural strength and thermal conductivity, whereas density was lower than in the reference and third mixtures.