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Determination of resilient modulus values for typical plastic soils in Wisconsin.
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  • Abstract:
    "The objectives of this research are to establish a resilient modulus test results database and to develop

    correlations for estimating the resilient modulus of Wisconsin fine-grained soils from basic soil properties. A

    laboratory testing program was conducted on representative Wisconsin fine-grained soils to evaluate their

    physical and compaction properties. The resilient modulus of the investigated soils was determined from the

    repeated load triaxial (RLT) test following the AASHTO T307 procedure. The laboratory testing program

    produced a high-quality and consistent test results database.

    The resilient modulus constitutive equation of the mechanistic-empirical pavement design was selected to

    estimate the resilient modulus of Wisconsin fine-grained soils. Material parameters (ki) of the constitutive

    equation were evaluated from RLT test results. Then, statistical analysis was performed to develop correlations

    between basic soil properties and constitutive model parameters (ki). Comparisons of resilient modulus values

    obtained from RLT test and values estimated from the resilient modulus constitutive equations showed that both

    results are in agreement. The correlations developed in this study were able to estimate the resilient modulus of

    the compacted subgrade soils with reasonable accuracy. The proposed material parameters correlations could

    be used to estimate the resilient modulus of Wisconsin fine-grained soils as level II input parameters. Statistical

    analysis on the test results also provided resilient modulus values for the investigated soil types, which can be

    used as Level III input parameters."

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