Modificationsto the resilient modulus testing procedure (aashtot-274) and the use of synthetic samples for equipment evaluation and calibration are described. The modifications to the aashto t-274 were carried out to produce a testing protocol for use in the testingprogram of the strategic highway research program. The modifications were aimed at producing a more repeatable and less complicated test procedure. The main changes are the use of external linear variable differential transformers (lvdts) for deformation measurements of all soil types and complete modification of the loading sequence andeliminating low deviator stresses, which produce high variability and high deviator stresses, which produce sample failure. The use of synthetic samples (polyurethane) with well-known properties to calibrate and evaluate resilient modulus equipment is also described. Synthetic samples could be an excellent choice in the development of a standard procedure for calibration of resilient modulus equipment. This paper appears in transportation research record no. 1278, Dynamic testing of aggregates and soils and lateral stress measurements 1990.
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