Sustainable Lightweight Concrete Incorporating 100% Recycled HDPE-Based Artificial Coarse Aggregates.
Abstract
In response to the twin challenges of resource depletion and plastic waste pollution, this study investigates the complete substitution of natural coarse aggregates in concrete with artificial coarse aggregates (ACA) made from high-density polyethylene (HDPE) plastic and sand. The innovative use of a 2:1 plastic-to-sand ratio to create 20 mm ACA demonstrates the potential for producing sustainable, lightweight concrete. Through careful material preparation, mix design (M20), and testing of hardened concrete, the research validates that concrete made with 100% HDPE aggregates can achieve an average compressive strength of 20.74 MPa, with a reduced density of approximately 1867.9 kg/m³. This material is well-suited for non-load-bearing and semi-structural elements, offering environmental, economic, and logistical advantages for modern construction
