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Title:
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The production of synthetic aggregate from a quarry waste using an innovative style rotary kiln
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Author(s):
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Sloot, H.A. van der; Wainwright, P.J.; Cresswell, D.J.F.
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Published by:
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Publication date:
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ECN
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1-4-2002
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ECN report number:
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Document type:
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ECN-RX--02-033
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Article (scientific)
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Number of pages:
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11
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Published in: Waste Management & Research, 2002:20, p. 279-289, ISSN 0734-242X (), , , Vol., p.-.
Abstract:
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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