The Characteristics of Pervious Concrete with Gravel as Coarse Aggregate

Pervious concrete is a low-cost and effective drainage technique for metropolitan areas that reduces storm water flow. The goal of this research is to examine the properties of gravel as a coarse aggregate material in pervious concrete. The geotechnical properties of the gravel were investigated to determine their suitability in the construction of pervious drainage structures. The samples collected were subjected to particle size distribution test, aggregate crushing value test, and aggregate impact value test. The concrete samples were then put through a series of tests, including a slump test, a compressive strength test, a density test, and a permeability test. In accordance with the particle size distribution result, the gravel is properly graded. The slump test affirms that as the aggregate size of the pervious concrete reduces, the workability improves. Coarse aggregate of 13.2mm size, had highest compressive strength (4.889KN/) at 28days while those of 19.00mm, 25.00mm, and 37.50mm had compressive strength of 4.520KN/,4.146KN/ and 4.074KN/ respectively. The 37.50mm aggregate size had a higher permeability value compared to that of the 13.20mm aggregate size pervious concrete. The compressive strength increased from 3 to 28 days, for the four aggregate sizes. It was detected that the 37.50mm aggregate size produced pervious concrete with a higher co-efficient of permeability of 8.652 X 10-4 cm/sec for aggregate sizes of 13.20mm, 19.00mm, and 25.00mm were 6.845 X 10-4 m/s, 5.768 X 10-4 m/s, and 3.993 X 10-4  m/s respectively. From the analysis of result derived, it is deduced that the use of granite for pervious concrete is stronger than gravel. Gravel can excellently be used in areas that are not subjected to repeated heavy loads.Keywords: Pervious Concrete, Granite, Gravel, Permeability, Compressive Strength