What is it about?
Study on using well-graded bottom ash (BAW) from coal plants to replace 5-35% of sand in lightweight concrete (with oil palm shells as coarse aggregate). Tests show 15% BAW optimizes strength (36.7 MPa compressive) and thermal conductivity (1.67 W/m·K), but higher levels increase porosity and reduce performance.
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Why is it important?
Reduces concrete weight below 1,900 kg/m³ for efficient buildings, recycles polluting waste to cut environmental harm, and conserves natural sand, promoting sustainable construction amid resource depletion.
Perspectives
- Environmental: Turns coal waste into resource, minimizing landfill pollution and sand mining impacts. -Engineering: 15% BAW balances strength, insulation, and density; suggests adding fibers for better flexibility in structures. -Economic: Low-cost waste reuse lowers material expenses in coal/palm-rich regions like Malaysia. -Future: Test durability in real applications; explore higher BAW with tweaks for broader use.
Dr. Mohammed Jalal Al-Ezzi
Bilad Alrafidain University
Read the Original
This page is a summary of: The Strength and Thermal Properties of Concrete containing Water Absorptive Aggregate from Well-Graded Bottom Ash (BA) as Partial Sand Replacement, Construction and Building Materials, July 2022, Elsevier,
DOI: 10.1016/j.conbuildmat.2022.127658.
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