Mechanical Recycling of Waste Plastic (High Density Polyethylene) for Construction Purposes

Abstract

Plastic waste leading to contamination and environmental hazard is a prioritized issue all over the world.
Mechanical recycling is the easiest approach to convert waste plastic in to recycled plastic with least environmental effect. To the best of author’s understanding, no research exists addressing the potential application of recycled plastic as an independent construction material instead of partial replacement in composites. This paper aims to investigate the compressive properties of mechanically recycled High Density Polyethylene (rHDPE). The compressive test has been performed as per ASTM D695-23 and stress-strain behavior has been obtained. In addition, gas emission analysis has been performed using smart sensor. The peak load reached up to 9.25 kN resulting in 18.25 MPa compressive strength. The compressive energy absorption was found to be 1.08 MJ/m3. Gas emission analysis revealed that oxygen level of 20.6% is close to 21% which is typical concentration for safe breathing. Also, concentration of carbon monoxide was found to be 12 ppm well below the 50-ppm maximum allowable concentration. The concentration of hydrogen sulphide and explosive limits were negligible. The compressive properties of rHDPE can be utilized to manufacture building products like blocks. However, improvement in terms of toughness, durability and fire resistance is required for gross level implementation in construction.