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Significance of test results is no greater than the extent to which the sample is representative of the mineral aggregate under consideration. Samples may be required for the purpose of indicating the average characteristics of a deposit or for the control of uniformity of production. In either case, experience and sound judgment on the part of the sampler are necessary to assure fairness to both the producer and the purchaser. The point at which samples are taken and the size and frequency of samples are discussed, as well as the causes of inaccuracy in sampling, and methods which will help to overcome the most common difficulties. Sampling during production, during transportation, and after arrival at the job are considered in sequence. This includes sampling from conveyor belt, bins, chutes, freight cars, barges, and stockpiles with reference to the A.S.T.M. Tentative Methods of Sampling Stone, Slag, Gravel, Sand and Stone Block for Use as Highway Materials (D 75 - 46T). Recommendations regarding the responsibility of the sampler are given.
Proudley, C. E.
Chief Materials and Test Engineer, North Carolina State Highway and Public Works Commission, Raleigh, N. C.