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Testing Methodology for Resilient Modulus of Base Materials
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1996-07-01
[PDF-2.93 MB]
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Edition:Sept. 1, 1992 - Aug 31, 1995
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Abstract:The main objective of this report is to describe a proposed resilient modulus testing procedure which has been developed for the Texas Department of Transportation. This procedure contains the main characteristics of the MSIITO T294-92 procedure with several exceptions. The loading sequence is modified to avoid subjecting the specimens to high deviatoric stresses at low confining pressures. The conditioning cycles are eliminated and replaced by grouting the specimen to the platens to minimize disturbance to the specimen during stage testing. The effects of end restraint on the measured deformations are minimized by using a gage length equal to the middle one-third of the specimen. To avoid well-known problems with mounting LVDT's on the specimen, non-contact probes are utilized to measure the deformations. To maximize the amount of information gained from testing, the lateral deformations are measured with non-contact probes to determine the Poisson's ratio. Based on tests on synthetic and base materials from different parts of Texas, the methodology proposed here seems to yield more accurate and repeatable results. In addition, compared to the MSIITO protocol, the preparation and setup of the specimen are more convenient and less time-consuming.
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