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Design and evaluation of foamed asphalt base materials.
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  • Abstract:
    Foamed asphalt stabilized base (FASB) combines reclaimed asphalt pavement (RAP), recycled

    concrete (RC), and/or graded aggregate base (GAB) with a foamed asphalt binder to produce a

    partially stabilized base material. The objectives of this study are to determine for Maryland

    conditions: (a) FASB mix design procedures; (b) typical engineering and structural design

    properties; (c) guidelines for FASB production and placement; and (d) best practices for

    construction quality assurance. The study consisted of three major components: (a) laboratory

    evaluation of FASB mix design procedures; (b) field evaluation of in-place FASB stiffness, and

    especially the increase in this stiffness with time due to curing; and (c) direct laboratory

    measurement of the performance related properties of FASB, specifically dynamic modulus and

    permanent deformation resistance. Recommended default design values for resilient modulus and

    structural layer coefficient are 300 – 400 ksi and 0.30 – 0.35, respectively. The study findings also

    provided guidance for the development of draft specifications.

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