Laboratory Aging of Asphalt-Aggregate Mixtures

by C. A. Bell, Oregon State Univ, United States,
Y. AbWahab, Oregon State Univ, United States,
M. E. Cristi, Oregon State Univ, United States,

Document Type: Proceeding Paper

Part of: Serviceability and Durability of Construction Materials


Aging may result in hardening (stiffening) of the mixture which will result in a change in performance of the mixture. This may be beneficial since a stiffer mixture will have improved load distribution properties and will be more resistant to permanent deformation. However, aging may also result in embrittlement and loss of durability in terms of wear resistance and moisture susceptibility. This paper presents the results of preliminary tests to evaluate aging methods for asphalt-aggregate mixtures. Short-term methods include oven aging and extended mixing, and, long term methods include oven aging and pressure oxidation. The effects of temperature level and duration of aging are presented. Test specimens were fabricated from two asphalts and two aggregates, representing extreme property levels. The four mixture combinations were prepared at two levels of permeability representing good and moderate compaction conditions. The effects of aging were determined using the diametral resilient modulus test.

Subject Headings: Aggregates | Asphalts | Mixtures | Material tests | Load distribution | Load and resistance factor design | Laboratory tests | Ultimate strength

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