as part of an investigation into the mechanical properties of graded aggregates, british standard vibrating hammer compaction tests have been carried out on a wide range of materials. it has been found that if results are expressed on a volumetric basis they can be used to simplify studies of the effects on compactability of changes in properties such as particle shape, texture and size distributuion. none of the experimental materials exhibited optimum moisture contents according to the standard criteria: a method of overcoming this problem is proposed. research aimed at providing improvements in apparatus and method is continuing (a).

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