Effect of variation in size of coarse aggregate on compressive strength, porosity, and permeability in pervious concrete
Keywords:
Pervious concrete, Coarse aggregate, Compressive strength, Porosity, PermeabilityAbstract
The Influence of Coarse Aggregate Size Variation on Compressive Strength, Porosity and Permeability of Pervious Concrete. The rapid population growth in Indonesia has led to an increased need for public infrastructure, it causing a reduction in green spaces that serve to absorb water. One solution to mitigate this negative impact is the innovation of pervious concrete, which contains voids that allow water to flow through from the surface into the ground. However, this concrete has low compressive strength but high porosity. The objective of this study is to examine the effect of varying coarse aggregate compositions on compressive strength, porosity, and permeability. In this research, a combination of coarse aggregate was used as the base material in four different mix variations which is 20:40:40, 20:35:45, 20:30:50, and 20:25:55. Total of 36 cylindrical specimens (10 x 20 cm) were required. The target compressive strength (Fc’) is 20 MPa, tested at 7 and 28 days. The mix design was calculated following the ACI 522R-10 method, and tests included compressive strength, porosity, and permeability. The test results revealed that the highest average compressive strength at 28 days was achieved in variation 4 (D) with a composition ratio of 20:25:55, achieved a compressive strength of 11,7 MPa, a porosity of 15,28%, and permeability of 0,75 cm/s. These findings confirm that variation 4 (D) meets the minimum criteria for grade D pervious concrete, making it suitable for applications in parkland.
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