Precise shape grading of coarse aggregate

The objective of the research described here was to derive dimensional parameters to provide a unique descriptive fingerprint for any sample of coarse-aggregate particles. The practical component of the work focused on devising a quick and accurate field test capable of yielding values for the descriptive parameters to enable a coarse-aggregate sample to be quantitatively appraise. The aim of the paper is to propose this test as a means of ensuring quality control of coarse-aggregate shape. The parameters used were derived from first principles and applied to realistic particle shapes using simple mathematical models. Standard specifications were analysed to identity finite limits of acceptance for specific applications. These limits were then converted into precise terms of reference for the parameters. Extensive laboratory tests were performed on coarse-aggregate samples using the innovative test regime. The results show that such a system can be useful in providing information about an aggregate.