This report presents a methodology for classifying aggregates based on the distribution of shape, texture, and angularity characteristics and recommends a test method for measuring these characteristics to help improve specifications for aggregates used in highway pavements. The test method measures shape, texture, and angularity characteristics of aggregates used in hot-mix asphalt, hydraulic cement concrete, and unbound base and subbase layers of highway pavements, and it is appropriate for use in central and field laboratories. This report will be of particular interest to materials engineers, researchers, and others concerned with the design and construction of flexible and rigid pavements. (Author/publisher) This report may be accessed by Internet users at http://onlinepubs.trb.org/onlinepubs/nchrp/nchrp_rpt_555.pdf
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