Abstract
In concrete production, a large amount of cement and aggregate are consumed annually by the construction industry. There are approximately 10 million tonnes of natural aggregate consumption for the concrete since the aggregate occupy 70 % of the overall volume. To deal with the issue on the excessive of natural aggregate exploitation, an alternative and innovative solution is by developing energy efficient artificial aggregate that are incorporated with waste products. This study examines the properties of artificial aggregate containing palm oil fuel ash (POFA) and silt from water treatment sludge. A total of five mixes containing POFA at 10, 20, 30, 40 and 50% by weight of silt have been prepared for this study. An alkaline activator and lime were added to the mixes at a dosage of 5% and 25% to binder respectively. The physical and mechanical properties have been tested at the ages of 7, 14 and 28. The mechanical properties are investigated based on the individual crushing strength and impact value. The results shown that the lightweight aggregate made of silt and POFA as based material has a potential in replacing the natural aggregate in concrete production.
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