Measurement of seasonal changes and spatial variations in pavement unbound base and subgrade properties.
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Measurement of seasonal changes and spatial variations in pavement unbound base and subgrade properties.

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    • Alternative Title:
      LTRC research project capsule, 08-5GT;Research project capsule, 08-5GT;
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    • Abstract:
      Soils often undergo cyclic wetting/drying, but there is very limited research on unsaturated

      soils subjected to variations in moisture content. More specifically, field moisture variation

      over time in highway unbound bases and subgrade soils is an important issue for pavement

      engineering because such variation will cause the variations of strengths and stiffness of

      pavement materials and affect pavements’ service life. Because of this, both the 1993

      AASHTO Pavement Design Guide and the new Mechanistic-Empirical Pavement Design Guide

      (M-EPDG), which is newly adopted by AASHTO for pavement structure design, require that field

      moisture variation overtime can be considered one of the major inputs for highway pavement

      structural design. Different engineering measures or approaches in pavement structures are

      also taken with an attempt to have the field moisture variation under control. All of these have

      a cost-associated consequence with an increase in construction and maintenance costs.

      Therefore, understanding field moisture variation over time and its spatial variation in

      unbound bases and subgrade soils is essential to conduct proper and cost-effective pavement

      structural design and construction that will result in pavements reaching their expected

      service lives.

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