Syammaun T, Isya M, Mahmud A, Husaini. Characterization of Air Voids and Permeability in Porous Asphalt Mixtures with Eggshell Ash as an Eco-Friendly Additive. IJIE. 2024;16(4):56-63. Accessed August 7, 2026. https://journal.uthm.edu.my/index.php/ijie/article/view/16253