Impact of variations in material properties on asphalt pavement life-evaluation of Warren-Scappoose project : interim report.
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1981-12-01
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Alternative Title:Impact of variations in material properties on asphalt pavement life-evaluation of Warren-Scappoose project.
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Abstract:Construction and short-term pavement performance problems were noted in the Pacific Northwest and throughout the United States during the past five years. Several reasons have been suggested to explain this sudden change in pavement performance, such as recent variabilities in asphalt properties and new developments in paving technology.
Using the data and construction materials from a recent project built in 1979-80, Oregon State Highway Division and Oregon State University initiated a laboratory study to determine the relationship between asphalt concrete pavement performance and mix level of compaction, asphalt content, and percent passing No. 200 sieve.
Conventional tests and improved dynamic tests were run on laboratory compacted samples to determine mix stiffness, fatigue life and permanent deformation characteristics. Based on fatigue and permanent deformation test results, pay adjustment factors performance of mix out of specifications. It was found that performance is primarily affected by the mix level of compaction. The design optimum asphalt content was corroborated by the fatigue data. A decrease in mix performance was observed when the amount passing the No. 200 sieve was decreased to 2%. Above the design optimum amount of fines, the mix performance increased proportionally to the asphalt content, showing a strong interaction fine-asphalt content.
A summary table giving the most critical pay adjustment factors between the fatigue and the permanent deformation criteria is developed in the conclusion and recommendations chapter.
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