Abstract
Abstract Agglomeration of reclaimed asphalt pavement (RAP) is one of the most important factors affecting performance of cold recycled asphalt mixture. This research is conducted to evaluate the agglomeration of RAP collected from various sources including both raw milled-off and plant-crushed RAP. Three different test methods were used to examine the breaking of agglomerates of RAP, including asphalt extraction test, modified LA abrasion test and mixing test. LA abrasion revolution of RAP samples was performed at various rotations of 50r, 100r, 200r and 300r, and mixing test was performed at different mixing time of 0.5 min, 1 min, 2 min and 3 min. Effects of the testing conditions and plant-crushing on RAP de-agglomeration were evaluated. The obtained results showed that all three tests could effectively reflect the agglomeration property of RAP materials. Good correlations were found among results of the three tests, while abrasion test and mixer test typically have lower loss% than asphalt extraction test. A general indicator of agglomeration degree was proposed for the tests to describe the agglomeration property of RAP and a classification method of RAP particles was proposed based on the results and findings in the tests. Weak structure of RAP has significantly higher agglomeration degree, while old aggregate has very low agglomeration degree. It is suggested to reduce content of weak RAP in the cold recycling process due to its negative impact on the performance of regenerated mixture.
Published Version
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