Behavior of Warm Mix Asphalt Concrete under Moisture Damage

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Saad Issa Sarsam


Due to the restrictions for protecting the environment, and the requirements to reduce fuel consumption, research work was started globally for verifying the possibility of implementation of warm mix asphalt concrete in pavement construction.  In this work, the influence of moisture damage on the physical properties of warm mix asphalt concrete was investigated. A total of 72 cylindrical specimens of 100mm diameter and 63.5mm height have been prepared in the laboratory with (4, 4.5, 5, and 5.5) percentages of asphalt content using the typical Marshal hammer compaction procedure. Specimens have been separated into two sets, and each set was divided into three groups. The first group was subjected to indirect tensile strength determination, while the second group was tested for Marshall Properties. The third group was subjected to double punch shear strength determination. The second set of specimens was exposed to moisture damage process. Specimens were immersed in a water bath and subjected to water absorption under a vacuum pressure of 30 mm Hg for 10 minutes, then the specimens were transferred to a deep freezer and stored for 16 hours at -8°C. Specimens were allowed to thaw for two hours at the laboratory environment, then conditioned for another two hours at 20°C. The conditioned specimens were subjected to the physical properties determination as that of the first set. Test results were analysed and compared, and the influence of moisture damage on each of the physical properties was determined. It was concluded that the reduction in Marshal Stability, shear strength, and tensile strength due to moisture damage was 36%, 30%, 43% respectively.

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