Community Research and Development Information Service - CORDIS


Europe produces 6 million tonnes per annum of slag and this project investigated the possible use of fine-grained slag as a barrier material in the multi-layer protection of controlled dumps of hazardous waste matter where very strict environmental standards apply. Initial investigations had shown some success where impermeability requirements regarding penetration by water were not demanding. These were followed by other trials to determine if admixture with other fine-grained materials such as bentonite, anthracite fly ash or ground metallurgical sand would improve the level of impermeability. Laboratory trials with a mixture of slag and bentonite indicated permeability rates of 10-7 to 10-8 m/sec which is acceptable for many applications but not for use in the storage of hazardous materials. Misgivings were also felt about the mechanical strength of mixtures of slag with anthracite fly ash or ground metallurgical sand, thereby eliminating these from consideration. It is possible that the use of other fine-grained materials or of calcium- rather than sodium bentonite would produce better results but this has not been investigated.

Additional information

Bibliographic Reference: EUR 18525 DE (1998) 54pp.
Availability: Available from OOPEC Sales agents
ISBN: ISBN 92-828-4851-5
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