EPS Concrete Block Calculator: Complete Reference
EPS Concrete Block Basics
EPS (Expanded Polystyrene) concrete replaces conventional aggregate with lightweight EPS beads, reducing density from 2400 kg/m³ to 300–900 kg/m³ while providing thermal insulation 3–5× better than standard concrete. EPS beads (12–30 kg/m³ bulk density) occupy 20–60% of the mix volume.
Typical mix: 300 kg/m³ cement + 200 kg/m³ sand + 40% EPS beads by volume + w/c 0.50–0.55. Admixtures (silica fume, fly ash) improve strength and workability.
Mix Design Formula
Mix density = ρ_matrix × (1−ε) + ρ_EPS × ε, where ε = EPS volume fraction (0.20–0.60). Compressive strength: fc ≈ fc_base × (1−ε)². At ε = 0.40, density ≈ 480 kg/m³ and fc ≈ 9 MPa from a 25 MPa base mix.
Thermal Performance
Thermal conductivity: λ ≈ 0.055 + 0.22 × (1−ε). U-value: 1/(Ri + t/λ + Re). At ε = 0.40, 200mm wall: λ = 0.187 W/m·K, U ≈ 0.87 W/m²K — substantially better than 230mm solid clay brick (U ≈ 2.0 W/m²K).
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FAQs
What is EPS concrete density?
Typically 300–900 kg/m³ depending on EPS fraction. At 40% EPS: ~480 kg/m³ (vs 2400 for standard concrete). Lower density = better insulation but lower strength.
Is EPS concrete structural?
Yes, with fc 5–15 MPa at 30–40% EPS. Suitable for low-rise load-bearing walls, infill panels, and partition walls. For high-load applications, use reinforcement and limit EPS to 30%.
How do EPS blocks compare to AAC?
Similar density range (400–900 kg/m³) and thermal performance, but EPS blocks can be cast on-site with standard equipment. AAC requires autoclave curing (high capital cost). EPS blocks are typically cheaper for small projects.
What EPS bead size is best?
2–5mm diameter beads are standard. Smaller beads improve surface finish; larger beads increase voids and insulation. Bead density 15–20 kg/m³ (bulk) offers the best balance of workability and insulation.