Since BA possesses comparable properties to those of raw materials applied in building materials, it has the potential to be modified to fit this application [3, 6–8]. Not only does this application minimise the need to landfill these materials, additionally it reduces the need for raw materials, essentially making this a sustainable approach. Nevertheless, due to the leaching of contaminants, a well-advised and thoughtful treatment of the material is needed in order to comply with legislation.