Physico-chemical aspects of soluble salt damage to thin bituminous road surfacing.
Soluble salt contamination of highway construction materials occurs in
climatic zones where evaporation exceeds precipitation. This results in an
upward migration of moisture to the surface, where salts present in solution
are precipitated. These climatic zones cover large areas of Australia, Africa,
The Middle East and North and South America.
Existing guidelines and recommendations for road design and construction
in saline areas are based mainly on experience of local materials and
conditions without a full understanding of the damage mechanism. This
has resulted in conflicting advice on how to prevent salt damage.
A laboratory simulation approach to understand the salt damage process
has been reported. This paper is concerned with an appreciation of the
geochemical processes, which are important for current laboratory and
field testing programmes.
International Conference on the Implications of Ground Chemistry and Microbiology for Construction, University of Bristol, 29 June to 1 July 1992. TRL - Crowthorne, UK. pp. 20