Strength Properties of Recycled Waste Plastic and Quarry Dust as Substitute to Coarse Aggregates: an Experimental Methodology

Plastic waste disposal is a significant environmental concern due to its low degradability and management practices, especially in developing countries. Plastic recycling is considered the most effective disposal method, which minimizes environmental impacts. This paper discusses the use of poly(ethylene terephthalate) (PET), high-density polyethylene (HDPE), and polypropylene (PP) plastic as aggregates in the concrete industry by incorporating quarry dust as a base material. An experimental mix design series was carried out, followed by a deoxygenated heat treatment on each mixture for optimum bonding. Compressive strength, specific gravity and water absorption properties were then investigated in each mixture. Although the specific gravity of PET plastic was 30% lower than the natural aggregates, the specific gravity of PET plastic aggregates was higher than the HDPE or PP waste plastic aggregates. Therefore, the proposed method is ideal for low-strength concrete components. Graphical Abstract