Resistance variation of low-quality aggregates

With an ever-decreasing source of aggregate, this study reports laboratory tests on geologically young material, some of which is unconsolidated, in order to determine whether they can be used as aggregates. Los Angeles abrasion and aggregate impact values were compared and correlations made between these parameters and the petrographic composition of the material, as well as some other common properties (particle shape, water absorption). The drift deposits tested consisted mainly of limestone gravels although clasts of sandstone with some deleterious chert and fine material were also present. Whilst the laboratory test results did not always conform to the requirements of the common Standards for aggregates, it was considered that, with appropriate processing, many of the materials could be used.