Pervious concrete using construction and demolition waste (CDW) and recycled EPS

ABSTRACT

This study developed pervious interlocking paving blocks using construction and demolition waste (CDW) and recycled expanded polystyrene (EPS). The reference mix (1:3, w/c ratio of 0.4) used river sand (1.2–2.4 mm) and gravel (4.8–6.3 mm). In the other mixes, the coarse aggregate was replaced by 30% and 100% of CDW and EPS was incorporated at 10% and 20%. Blocks (20 cm × 10 cm × 6 cm) and cylindrical specimens (10 cm × 20 cm) were produced. After wet curing, they were oven-heated at 100°C for 24 hours to reduce EPS volume and create voids. All mixes met the minimum permeability coefficient (10−3 m/s) according to ABNT NBR 16416 (2015). The reference mix and the mix with 30% CDW (with or without EPS) achieved compressive strength near or above the 20 MPa required by ABNT NBR 16416 (2015). However, EPS did not generate voids as expected, likely due to insufficient heating conditions. In conclusion, CDW can replace up to 30% of coarse aggregate, with or without EPS, for pervious block production while meeting ABNT NBR 16416 (2015) standards.

Keywords:
Pervious concrete; Pervious interlocking paving blocks; Construction and demolition waste; Recycled aggregates; Recycled expanded polystyrene