Use of bottom ash and stone dust to make lightweight aggregate

The objective of this study is to describe how by-products of bottom ash and stone dust can be converted to lightweight concrete aggregate; both stone dust and bottom ash have a chemical composition ideal for use as expansive lightweight aggregates. This study determined the optimum proportion of bottom ash and stone dust. Bloating agents and fluxes such as Na2SO4, Na2CO3, CaSO4, CaCO3, and NaOH along with glass abrading sludge, Fe2O3, blast furnace slag, and oxidizing slag were tested to determine the optimal properties of manufactured lightweight aggregate products. Furthermore, the type of furnace needed for production and the sintering temperature required for the materials was tested and determined. This study also determined that an oven-dried density of 1.46 g/cm3 with an absorption ratio of 8.5% can produce lightweight aggregates ideal for use as a lightweight concrete for structural usages.