Evaluation of fly ash as supplementary cementitious material to the mechanical properties of recycled aggregate pervious concrete

Pervious concrete is a type of pavement made with minimal fine aggregate and high void ratio that allows stormwater to infiltrate into the soil and overcomes surface runoff problems. In this paper, the utilization of fly ash as supplementary cementitious material to the mechanical properties of pervious concrete made with recycled aggregate was investigated. Recycled aggregate was reclaimed from concrete waste to make pervious concrete. 0%, 50%, and 100% of recycled aggregate were used to replace natural coarse aggregate; while 0%, 15% and 25% of fly ash were used as cement replacement. The mechanical properties of pervious concrete were evaluated by determining the compressive strength, splitting tensile strength and flexural strength at 28 days. The results revealed that the use of recycled aggregate significantly affected the strength of pervious concrete. Further, the experimental results show that fly ash as supplementary cementitious material improved the compressive strength, splitting tensile strength and flexural strength of pervious concrete.