title: Use of co-combustion bottom ash to design an acoustic absorbing material for highway noise barriers.
abstract: The present study aims to determine and evaluate the applicability of a new product consisting of coal bottom ash mixed with Portland cement in the application of highway noise barriers. In order to effectively recycle the bottom ash, the influence of the grain particle size of bottom ash, the thickness of the panel and the combination of different layers with various particle sizes have been studied, as well as some environmental properties including leachability (EN-12457-4, NEN-7345) and radioactivity tests. Based on the obtained results, the acoustic properties of the final composite material were similar or even better than those found in porous concrete used for the same application. According to this study, the material produced presented no environmental risk.
authors.affiliation: University of Seville, School of Industrial Engineering, Department of Chemical and Environmental Engineering, Camino de los Descubrimientos s/n, E-41092 Seville, Spain.
authors.forename: Celia
authors.initials: C
authors.lastname: Arenas
authors.forename: Carlos
authors.initials: C
authors.lastname: Leiva
authors.forename: Luis F
authors.initials: LF
authors.lastname: Vilches
authors.forename: Héctor
authors.initials: H
authors.lastname: Cifuentes
mesh_terms: D060729:Coal Ash / Q000737:chemistry*; D003252:Construction Materials / Q000032:analysis*; D009622:Noise / Q000517:prevention & control*; D010316:Particle Size; D059027:Recycling
chemical_list: D060729:Coal Ash
keywords: Bottom ash; Leachability; Particle size; Radioactivity; Sound absorption coefficient