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The equidimensionality and angularity of coarse and fine aggregate particles, the shape of the relief and the degree of relief on their surfaces, the amount of surface area caused by the kind and degree of relief, and the chemical and physical nature of coatings, if present, are all characteristics that significantly affect the properties of both fresh and hardened concrete. Differences in particle shape and surface texture, as between different rock types, will affect the bulk void contents and frictional properties of the aggregates and, in turn, the ingredient proportions, mechanical properties, and economy of the unhardened concrete mixtures made from them.
Principal research scientist, Martin Marietta Laboratories, Baltimore, Md.