| description abstract | Pothole repair for porous pavements requires the patching mixture to have sufficient connected air voids, high strength, low moisture susceptibility, and high abrasion resistance. In this study, a cold patch asphalt mixture for porous pavements was designed. Turpentine was used as the solvent for the cutback asphalt, replacing diesel. The bentonite-cement was used as a mineral filler to improve adhesiveness between the aggregates and asphalt. Laboratory tests were conducted to investigate the initial strength, fully cured strength, moisture susceptibility under soaking and freeze-thaw cycling, and abrasion resistance of the designed cutback asphalt mixture. Test results showed that turpentine had a similar solubility parameter with asphalt but a higher evaporation rate than that of diesel. The cold mixtures had sufficiently high air voids of 20%. The cold mixtures produced with turpentine showed higher initial and cured strength, lower moisture susceptibility, and higher abrasion resistance, as indicated by a lower Cantabro loss value. Due to the relatively good solvability with asphalt and the higher evaporation rate of turpentine, the cold mixtures were thoroughly mixed, the aggregates were more evenly coated, and the performance of the designed mixtures was greatly improved. | |
