Performance of masonry blocks containing different proportions of incinator bottom ash

This paper presents the results from an experimental suite of tests as a trial to assess the structural and material performance of masonry blocks with different proportions of incinerator bottom as (IBA) as a fine aggregate replacement. The tests undertaken include compressive and flexural strengths, water absorption and density.Research into the use of waste by-products in construction materials has been increasing over the past 20 years. IBA produced in an Irish waste incinerator facility is currently landfilled following pre-treatment. This project assesses the suitability of this IBA to replace 0, 10, 20, 30, 50, 75 or 100% of natural fine aggregates in masonry blocks (100 mm high × 215 mm wide × 440 mm long) with a design strength of 7 N. Structural tests included compressive and tensile strength, density and water absorption in accordance with ASTM C140.The results indicate that bottom ash replacement levels below 20% provide adequate compression and tensile strengths with density and absorption also within satisfactory levels.