Abstract
AbstractThis study evaluated the effect of postcompaction moisture variations on the resilient modulus (MR), unconfined compressive strength (UCS), and modulus of elasticity (E) of cementitiously stabilized subgrade soils. Class C fly ash (CFA) and hydrated lime were used as the stabilizing agents. Specimens were compacted at optimum moisture content (wopt) with different percentages of stabilizers (i.e., 10% CFA and 6% lime) and then either dried or wetted to different moisture contents prior to testing for MR, UCS, and E. Results showed that MR, UCS, and E values increased due to drying and decreased due to wetting. MR-moisture, UCS-moisture, and E-moisture models were developed and proved to be useful in predicting the variations of MR, UCS, and E values of stabilized subgrade soils with moisture changes. These models can be used, in the new mechanistic-empirical pavement design approach (M-E PDG), to predict MR, UCS, and E values of stabilized subgrade soils with moisture variations.
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