Performance Evaluation of Fiber and Silica fume on Pervious Concrete Pavements Containing Waste Recycled Concrete Aggregate

Pervious concrete as a paving material rehabilitate on a new interest due to its efficiency to permit water to drainage over itself to flow groundwater and reducing storm water runoff. The employment of Recycled Coarse Aggregates (RCA) from site of construction and destruction wastes to product green concrete as a sustainable solve with varied environmental interests. Three different series (A, B, and C) of pervious concrete were used in this work, every series consisting of four mixtures, The (series A) mixtures with RCA replacement were 25%, 50%, 75% and 100% by weight of Natural Coarse Aggregate (NA), and (series B) mixtures using the same replacement ratios of RCA in addition of (silica fume SF) of 2.5%, 5%, 10%, and 12% by weight of cement to strengthen the cement past of pervious concrete. Finally, the (series C) mixtures were included the similar ratios of RCA and SF in addition to glass fibers of volume fraction 0.05%, 0.1%, 0.15%, and 0.2%. The properties of RCA pervious concrete investigated from density, hydraulic conductivity coefficient, porosity, and strength indices were compressive, flexural, and splitting tensile strengths. The test results shows that the use of RCA slightly affect hydraulic conductivity and nugatory effect on compressive, tensile, and flexural strengths where the use of silica fume and glass fibres more strong effect on the hydraulic conductivity and positive effect on pervious concrete flexural, splitting tensile strengths.