et al., S. M. K. “Recycle of Waste Plastic Materials (Polyvinyl Chloride (PVC) and Polypropylene (PP)) As a Fine Aggregates for Concrete”. International Journal of Advanced Science and Technology, Vol. 29, no. 1, Jan. 2020, pp. 911 -8, http://sersc.org/journals/index.php/IJAST/article/view/3558.