Investigation of selected properties of porous asphalt using recycled concrete aggregates and fly ash

Tóm tắt

The increasing frequency of urban flooding highlights the urgent need for effective surface drainage solutions, among which the Permeable Pavement System is considered a promising approach. Porous asphalt (PA) is commonly employed as the surface layer in such systems due to its high permeability. This study evaluates the impact of replacing natural aggregates (NA) with recycled concrete aggregates (RCA) in PA mixtures and examines how this substitution influences key mechanical and hydraulic properties of the material. A series of PA samples were fabricated and divided into two groups: one group incorporating RCA, and the other employing NA as the control. The investigated properties include bulk density, permeability coefficient, Marshall stability, indirect tensile strength, Cantabro loss, and resistance to clogging. The results indicate that PA mixtures incorporating RCA exhibit lower bulk density, Marshall stability, indirect tensile strength, and Cantabro resistance, with reductions of 11%, 14%, 5%, and 38.5%, respectively, compared with the NA samples. Conversely, the permeability coefficient of the RCA mixtures increases by approximately 9%. Despite the decrease in several mechanical indicators, all evaluated properties satisfy the technical requirements specified in TCVN 13048. Overall, the findings confirm the feasibility of using RCA in PA mixtures, offering benefits in reducing construction waste while enhancing surface drainage performance in urban infrastructure.