Suitability of Using Pervious Concrete Containing Incinerator Bottom Ashes as a Roadway Base Course

Various applications of incinerator bottom ashes (IBA) have been considered sustainable in many countries for years. This study evaluated the suitability of applying IBA added pervious concrete as roadway base course. Material properties, mix proportion, and an in situ test section were evaluated. The IBA were found to have good mechanical properties compared with natural aggregates. The results of the mix design indicated that increasing IBA will lead to a reduction of compaction strength. It was found that mixtures with less than 60% IBA replacement can give acceptable performance that meets specifications. Adding IBA to pervious concrete does not reduce its volumetric stability. In situ test results indicated that the permeability and noise of test sections with IBA are better than those of traditional asphalt concrete pavement. Roughness and rutting of test sections with IBA are similar to, although slightly worse than, those of traditional asphalt concrete pavement. Water samples showed that IBA-containing pervious concrete had only slight Cu leaching, which was much lower than the limits permitted by standards. It was concluded from all the test results and observations in this study that applying IBA-containing pervious concrete as roadway base course is adequate under the given conditions.