Abstract
In this study, several concrete mixes were developed by partially replacing all concrete mix components with recycled expanded polystyrene (EPS) beads. The replacement ratios ranged from 10% to 60% of the total mix volume. The impact of compaction was also studied by casting half of the specimens without compaction and the other half with compaction. Evaluations included thermal conductivity, density, compressive, flexural, and splitting tensile strengths. Results showed that EPS replacement improved thermal insulation but reduced density and all mechanical properties. Density decreased by 8% to 46% for compacted and 14% to 60% for uncompacted specimens. Thermal conductivity dropped by 38% to 74% for compacted and 58% to 85% for uncompacted specimens. The compressive strength of compacted specimens decreased exponentially, but those with up to 40% EPS were suitable for load-bearing blocks. Specimens containing 50% EPS exhibited a compressive strength of 7.2 MPa, making them suitable for non-structural applications requiring good thermal insulation properties. Although the EPS substitution lowered the strength-to-density ratio, it is expected to produce a more eco-friendly LWC due to reduced cement, water, and aggregate consumption.
Published Version
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