Evaluation of ASTM Test Method D 4867, Effect of Moisture on Asphalt Concrete Paving Mixtures
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Evaluation of ASTM Test Method D 4867, Effect of Moisture on Asphalt Concrete Paving Mixtures

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    Final Report
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    The moisture sensitivities of 21 dense-graded asphalt pavements were predicted in 1987 using American Society for Testing and Materials (ASTM) Test Method D 4867, Effect of Moisture on Asphalt Concrete Paving Mixtures. Tests were performed on cores taken from the pavements. The air-void levels of the cores varied from pavement to pavement. In 1995 and 1996, cores were again taken from the pavements to ascertain whether the test method correctly predicted performance. Pavement distress surveys were also performed. The data indicated that air-void levels lower than 6.0% may not always allow the specimens to become sufficiently damaged in the laboratory test. The correlation between ASTM D 4867 and pavement performance was poor except for mixtures having air-void levels greater than 6.0%. Therefore, it is recommended that a 6.0% minimum air-void level be used when evaluating conventional, dense-graded asphalt paving mixtures for moisture sensitivity, even if lower air-void levels are typically obtained in the field after construction. This recommendation should also be valid for the American Association of State Highway and Transportation Officials Test Method T 283, Resistance of Compacted Bituminous Mixture to Moisture-Induced Damage. Pass/fail criteria of 80% for the tensile strength retained ratio, 70% for the diametral modulus retained ratio, and 10% for visual stripping are recommended for conventional, dense-graded asphalt paving mixtures. Dense-graded sulfur-extended asphalt (SEA) pavements were also included in the study. The 1987 laboratory test data indicated that the retained ratios of these mixtures can be significantly affected by losses in cohesion. The SEA binders themselves can be severely weakened by the conditioning processes used by ASTM D 4867. However, the performances of the SEA pavements provided no evidence that they were affected by a loss in cohesion. In this experiment, the performance of each SEA pavement was compared to the performance of an asphalt concrete control pavement. Pass/fail criteria for SEA mixtures could not be proposed due to the uncertainty of how the test data relate to pavement performance.
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