Environmental Considerations in the Design of Asphalt Concrete Paving Mixturesby H. L. Von Quintus, Brent Rauhut Engineering Inc, United States,
T. W. Kennedy, Brent Rauhut Engineering Inc, United States,
B. E. Ruth, Brent Rauhut Engineering Inc, United States,
Abstract: The design of asphalt concrete mixtures is largely based on two empirical mixture design methods. These are 'Marshall' and 'Hveem', and both procedures have been standardized by AASHTO and ASTM. Environmental factors in these mixture design methods are considered through the selection of the material components making up the mixture. Three factors that have a significant effect on the performance and durability of asphalt concrete mixtures are temperature, moisture and aging of the asphalt concrete. All three are important parameters in predicting the durability of the pavement with time. This paper presents procedures that have been used to evaluate the temperature, moisture and time related factors on the occurrence of various pavement distresses during the laboratory evaluation and design of asphalt concrete mixtures. Included are various accelerated aging techniques used to condition specimens in the laboratory for testing. The type of tests and material properties used to evaluate the mixture's behavior under the affects of the environment and traffic loads are also presented.
Subject Headings: Asphalt concrete | Mixtures | Pavement design | Moisture | Laboratory tests | Material properties
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