The Investigation of Present Aggregate Gradation Control Practices and the Development of Short-Cut or Alternative Test Methods.

摘要

This report covers the first phase of an investigation into current aggregate gradation control practices. 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 the information gathered. Short-cut and alternative test methods for gradation determination are described,and those that offer promise of being a good substitute for the standard method will be further investigated and tested in the second phase of the study.