Huan, K. W., & bin Abdul Rahman, M. F. . (2021). The Development of Plastic Concrete Mix with Recycled Plastic (HDPE) in Concrete Production for Flat Roof of Sustainable Building. Progress in Engineering Application and Technology, 2(1), 151-156. https://penerbit.uthm.edu.my/periodicals/index.php/peat/article/view/669