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Developing an economical and reliable test for measuring the resilient modulus and Poisson’s ratio of subgrade.
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2010-11-01
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[PDF-652.96 KB]
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Alternative Title:Ohio Transportation Consortium project report.
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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
Penerometer) 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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