Manufacturedbyproduct secondary aggregates

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Produced as a result of man-made operations or processes, manufactured/by-product secondary aggregates include: pulverised fuel ash (pfa), furnace bottom ash (fba), blastfurnace and steel slags, and asphalt road planings. Pfa is produced as the main residue from coal fired power stations. Blastfurnace and steel slags are process wastes from iron and steel making and asphalt road planings are bituminous roadstone removed from the surface of roads prior to maintenance/resurfacing etc. Useful descriptions of these materials are again given in Whitbread et al ( 1991 ) and Gutt et al ( 1974).

Table 2.1: Materials as waste in construction and arising from demolition and their potential for reuse, recycling and/or waste minimisation

Waste Material type

Potential for reuse

Potential for recycling

Potential for waste minimisation

Primary aggregates (sand, gravel, rock)

3

N/A

2

Natural secondary aggregates (mincstonc, slate, china clay sand ctc)

3

N/A

2

Manufactured/by-product secondary aggregate (pfa, slags ctc)

3

N/A

2

Concrete

3

3

2

Masonry (stone)

3

3

2

Bricks

3

3

3

Tiles/pipes

3

1

3

Soils

3

1

1

Timber

3

3

2

Glass

1

3

2

Paper/card

0

3

2

Metals

1

3

2

Plastic

1

3

3

Oils

0

3

3

Chemicals (paints/solvents)

0

2

3

Plastcr/gypsum products

0

1

3

Asbestos

0

0

N/A

Water/aqueous solutions

1

1

3

Potential assessed as N/A = Not applicable

2 = Intermediate

Potential assessed as N/A = Not applicable

2 = Intermediate

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