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Millions upon millions of dollars change hands daily in various segments of the concrete industry, based on evidence obtained from samples. Yet, in most instances, the sample is obtained in an indifferent manner by someone who is ignorant of the basic principles of sampling (frequently a laborer or warehouseman), the use to which the sample is to be put, the tests to be performed on the sample and the final decisions to be based on or derived from the test results—all very important factors that should be considered in the sampling process. There appears to be no adequate appreciation of the importance of sampling by those who should be concerned with the problems resulting from poor sampling—those who have to make important decisions and set policy based on test results from samples—despite the cost of the large volume of samples and testing in the concrete field and the larger economic significance of conclusions which are derived from these.
Consulting engineer, Denver, Colo.