Resilient modulus of select aggregate bases and their correlations with other engineering properties (FHWA-OK-93-06) 2189

Abstract

Six most commonly encountered aggregate materials which are used ´ subbaseslbales in Oklahoma are se1ected and tested under dynamic loading by using AASHTO designation T292‡91 I. A ‡ vibratory compaction method was successfully developed to prepare the 6 Inch diameter. and 12 inch long specimen at optimum moisture content. The gradation of the specimens met the OOOT 1988 specification Type A and Type B. Exploratory tests were carried out to assess the effect of varying gradations, compaction . method, moisture content, specimen size, and testing procedures in the RM. Statistical correlation$ were established between RM and CBR, between RM and cohesion and friction angle, and between RM and E. For a given gradation, the Resilient Modulus values of. the six aggregate types at the ume bul< stress are relatively close: the influence of gradation and compaction method on RM values were less significant compared to the effects of moisture content and the stress state: the T2N-921 testing procedure gave higher resilient moduli than those obtained by using the T292‡91 I testing procedure: the RM values for 4´ specimens were higher than those for´‡ specimens; and the best correlations exist between the cohesion and friction angle and the RM values.