title: The production of synthetic aggregate from a quarry waste using an innovative style rotary kiln.
abstract: The large volumes of wastes generated by industrialised society has led to efforts to find practical uses for these wastes, whilst also offsetting the consumption of natural resources. This paper describes the use of an innovative rotary kiln to produce synthetic aggregates from a variety of waste streams. The main waste used was a quarry fines which was blended with either paper sludge, clay, or a dredged harbour sediment. The different combinations were extruded and fired in the kiln to produce a material suitable for natural aggregate replacement. Two of the synthetic aggregates produced were tested by incorporation in to concrete as coarse aggregate replacement. The concrete 28-day compressive strengths achieved were above 40 N mm(-2) and compared favourably with control concretes made with natural aggregates and a commercially available lightweight aggregate (Lytag). Leaching tests have also been carried out to assess the potential environmental impact of utilisation. Although not finalised, these tests have also given favourable results.
authors.affiliation: School of Civil Engineering, University of Leeds, United Kingdom.
authors.forename: R J
authors.initials: RJ
authors.lastname: Wainwright
authors.forename: D J F
authors.initials: DJ
authors.lastname: Cresswell
authors.forename: H A
authors.initials: HA
authors.lastname: van der Sloot
mesh_terms: D000538:Aluminum Silicates; D000077215:Clay; D003247:Conservation of Natural Resources; D004738:Engineering; D019015:Geologic Sediments; D055593:Geological Phenomena; D005844:Geology; D007220:Industrial Waste; D008420:Manufactured Materials; D010209:Paper; D013696:Temperature
chemical_list: D000538:Aluminum Silicates; D007220:Industrial Waste; D000077215:Clay