Comparative evaluation of subgrade resilient modulus from non-destructive, in-situ, and laboratory methods : technical summary report.
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2008-09-01
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Abstract:The Resilient Modulus (Mr) of pavement materials and subgrades is an important input
parameter for the design of pavement structures. The Repeated Loading Triaxial (RLT) test
typically determines Mr. However, the RLT test requires well trained personnel and expensive
laboratory equipment in addition to being relatively time consuming. Therefore, highway
agencies tried to seek different alternatives. Various empirical correlations have been used to
predict Mr in the last three decades. Such correlations include parameters such as the soil
support value (SSV), the R-value, and the California bearing ratio (CBR). In addition, different
in-situ tests were used to develop models for the estimation of Mr of different pavement
materials. These tests are characterized by the ease of operation and their ability to assess the
structural integrity and estimate the elastic moduli of in-situ pavement layers. They have an
additional advantage of being able to assess the pavement structure without destroying it.
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