Lee, Sang-Soo, Won-Gyu Lee, and Een-Seok Jo. “Properties of Permeable Block According to Replacement Ratio of Fly Ash”. International Journal of Engineering and Technology 7, no. 3.24 (August 10, 2018): 375–378. Accessed February 11, 2026. https://www.sciencepubco.com/index.php/IJET/article/view/22689.