The Influence of Aggregate Size and Blocking Materials to the Water Infiltration Rates of Pervious Concrete

The purpose of this study is to identify the differences in porosity and infiltration rates when the mixing ratio of aggregates is different and to present the mixing ratio satisfying the compressive strength requirement specified in Korean standard for sidewalks, bicycle roads and other civil facilities without consider the traffic loads. Three mix ratios were suggested by considering various aggregate sizes and three cylinders were made for each ratio. The porosities of those cylinders were evaluated through compression and water infiltration rate test, measuring the weight of specimens in underwater and analysis of pictured Computed Tomography (CT) image. Experiments have shown that it is best to mix 50% for 5–10 mm aggregates, 45% for 2–5 mm aggregates and 5% for sand in terms of strength and infiltration rates. In addition, as the proportion of fine aggregates increased, the porosity and infiltration rates decreased. Moreover, the effectiveness of maintenance method was also examined in this study.