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ECN publication
The production of synthetic aggregate from a quarry waste using an innovative style rotary kiln
Sloot, H.A. van der; Wainwright, P.J.; Cresswell, D.J.F.
Published by: Publication date:
ECN 1-4-2002
ECN report number: Document type:
ECN-RX--02-033 Article (scientific)
Number of pages:

Published in: Waste Management & Research, 2002:20, p. 279-289, ISSN 0734-242X (), , , Vol., p.-.

The large volumes of wastes generated by industrialised society hasled to efforts to find practical uses for these wastes, whilst also offsetting the consumption of natural resources. The 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 course 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.

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