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This report covers the first phase of an investigation into current aggregate gradation control practies. It presents the results of a literature search and a survey of current testing procedures and sampling and testing frequencies for various aggregate uses. Summary information is presented on length and method of sample drying; size and number of sieves; length and method shaking; source of the sample (i.e. stockpile, truck, roadway, etc.); and who (producer or consumer) performs the test. Also included are recommendations as to testing and sampling frequencies based on theinformation gathered.
February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index