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The use of LD slag as aggregates for surface dressing and bituminous concrete has an advantage in the upgrading of by-products coming from the iron and steel industry. LD slags have interesting mechanical properties, but their stability may be questioned by the existence of bicalcium silicate in the "B" metastable form and of inclusions of quicklime. The studies executed in the laboratory have indicated means whereby the material may be stabilised. The studies included the realisation of experiments - using bituminous concrete and surface dressings - comparing slags treated by air weathering or by immersion in water with natural stone. This comparison brings out the best properties of adhesion of the latter after paving but the effects of the traffic gradually cause a diminution of this difference. During subsequent years, the behaviour of LD slags treated by weathering or in water was similar to that of natural stone, which permits their use in road making in agreement with the French specifications on aggregates.

Additional information

Authors: DRUSSART J, LAITIERNOR, Dunkerque (FR)
Bibliographic Reference: EUR 11685 FR (1988)
Availability: (2)
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