Abstract
The resilient modulus and Poisson’s ratio of base and sub‐layers in highway use are important parameters in design and quality control process. The currently used techniques include CBR (California Bearing Ratio) test, resilient modulus test, DCP (Dynamic Cone Penetrometer) and FWD (Falling Weight Deflectometer) tests. Nevertheless, these techniques have certain limitations and sometimes fail to satisfy the requirement and accuracy for design purposes. Meanwhile, piezoelectric sensors have been widely used for laboratory measurement of wave velocities in soil and rock specimens in recent years. For shear wave velocity determination, bender elements have been applied to the tests. On the other hand, extender elements have been used for the measurement of compression wave velocity. Therefore, this new laboratory testing technique is developed to measure the two important parameters, the resilient modulus and Poisson’s Ratio in a more advanced approach. The results of using this technique on a soil sample is presented and compared with that obtained from CBR tests. It is concluded that this new technique is simple, accurate and has potential to be widely used in engineering practice.
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