T. Syammaun, M. Isya, A. Mahmud, and Husaini, “Characterization of Air Voids and Permeability in Porous Asphalt Mixtures with Eggshell Ash as an Eco-Friendly Additive”, ijie, vol. 16, no. 4, pp. 56–63, Aug. 2024, Accessed: Sep. 16, 2024. [Online]. Available: https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/16253