Document Type : Original Article
Authors
1
Geology Department, Faculty of Science, Menoufia University, Menofia Governorate, Egypt.
2
Head of Geology Department, Faculty of Science, Menoufia University, Egypt
3
Geology Department, Faculty of Science, Menoufia University, Egypt
4
Head of Civil Engineering Department, Faculty of Engineering, Menoufia University, Egypt
Abstract
This comprehensive study investigates the mechanical properties of self-compacted lightweight concrete (LW-SCC) manufactured with Light Expanded Clay Aggregate (LECA) and modified with various mineral additives including lime powder (LP), marble dust (MD), fly ash (FA), and granulated quartz (GQ) at different percentages (10%, 20%, and 30% by weight of cementitious materials). Fourteen concrete mixtures were prepared and evaluated for both fresh and hardened properties. Fresh properties were assessed through flow diameter, T500, J-ring, L-box, and V-funnel tests, while hardened properties including density, compressive strength, splitting tensile strength, flexural strength, and bond strength were determined at 7, 28, and 56 days. Results demonstrate significant improvements in mechanical properties with the incorporation of mineral additives. LECA concrete containing 10% lime powder exhibited 25% higher compressive strength than the control mix with silica fume. Marble dust at 20% provided optimal mechanical performance with a 35% increase in compressive strength and a 37% improvement in tensile strength. Fly ash showed progressive enhancement in mechanical properties with increasing content, achieving 15% improvement in compressive strength at 30% replacement. Granulated quartz was most effective at 10% content, delivering 20% higher compressive strength and the highest bond strength improvement of 52.63% at 7 days. All mixtures maintained lightweight characteristics with densities between 1.70-1.75 t/m³. Fresh concrete properties improved with increasing mineral additive content, with enhanced flowability and passing ability. This research establishes that LECA can effectively produce structural lightweight self-compacted concrete with significantly enhanced mechanical properties through the strategic incorporation of mineral additives, offering promising applications in sustainable construction.
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