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Evaluating The Impact Of Lime On Pavement Performance (Draft Final)
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The purpose of this project is to quantify expected changes in pavement life from adding lime to hot mix asphalt (HMA) based on an extensive laboratory testing program and advanced mechanistic analyses. This research differs from previous studies in several respects. First, because lime is used in HMA primarily for anti-stripping benefits, previous studies rarely quantified lime’s other performance benefits. Second, because testing is typically performed on only the HMA mix being considered for a project, and only as necessary to satisfy specifications, typical studies do not capture the full range of failure modes and environmental stresses. Furthermore, once specifications are met, test results are rarely translated into pavement performance characteristics. This research, by contrast, evaluated fifteen HMA mixtures with the most widely accepted laboratory tests for the following modes of pavement failure: • moisture damage • fatigue cracking • permanent deformation • thermal cracking • oxidative aging With these tests, the impact of lime and liquid additives on the mechanical properties and performance of HMA mixtures were estimated, in terms of changes in pavement life. Changes in pavement life and performance were then translated into changes in the life cycle cost of HMA pavements.