Abstract:
Despite ongoing research covering more than 60 years in southern Africa, the assessment
of the potential durability of basic crystalline rock aggregates for use in road construction is
still a major problem. Over the years various innovative test methods and specifications
have evolved to the point where currently, more than half a dozen tests are carried out
with specifications for each. Frequently, the materials pass most of the tests but may be
rejected by one or two, leading to indecision about their use and often probably incorrect
rejection of a potentially useful material source. This paper describes the development of a
weighted durability rating system, as used in a variety of road engineering disciplines, to
quantify the potential durability and allow a better- informed decision on the material
usage.
