Assessment of bottom ash use as fine aggregate replacement in concrete

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Conference Proceeding
From Materials to Structures: Advancement through Innovation - PROCEEDINGS OF THE 22ND AUSTRALASIAN CONFERENCE ON THE MECHANICS OF STRUCTURES AND MATERIALS, 2013, pp. 1183 - 1186
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Concrete is the most common construction material used worldwide. Fine aggregate constitutes approximately 25% of the total volume of concrete. Currently, most fine aggregate used in concrete consists of naturally occurring sands, which are sourced from sand quarries. In the future, Sydney will face a sand shortage, with most quarries becoming exhausted. This will likely lead to increased demand in using sands hauled from longer distances, adversely impacting the environment. This project investigates the feasibility of using bottom ash (BA) as a novel sand replacement in concrete. BA is defined as a by-product of coal burning power stations. The BAs used in this study were sourced from 3 different power stations in NSW to assess the practicality of using BA for replacement of sand in concrete. Compared to control concrete, Bayswater BA concretes showed improved performance at 20% replacement of sand content with higher compressive strength and lower drying shrinkage.
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