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Trends in Transport Engineering and Applications Original Research

Initiation of Distress in Asphalt Concrete After Practicing Moisture Damage

  1. Saad Issa Sarsam Department of Civil Engineering, College of Engineering, University of Baghdad, Iraq

Abstract

The moisture damage of asphalt concrete is considered as major type of distress in heavy rainfall environment. In this work, the decline in the initial flexural stiffness of asphalt concrete was monitored after practicing the moisture damage process. The variations were analyzed relative to the control mixture. Asphalt concrete mixtures were created in the laboratory with the optimal binder content. Extra mixtures were also prepared with ±0.5% variation of binder content from optimum for comparison. The compaction of the asphalt concrete mixtures were conducted into a slab mold with the aid of roller. A diamond saw was used to cut the beam varieties from the slab samples. Beam specimens were separated into two groups, the first group practiced the moisture damage process and the second group was denoted as the control mixtures. The prepared beam specimens were subjected to dynamic flexural stresses at three various constant strain levels. It was observed that moisture damaged specimens tested under 250 and 400 constant Microstrain levels exhibit failure at 75 and 70% of the original flexural stiffness respectively. The elapsed time increases by 100 and 166.6% at mixtures prepared with 4.8 and 4.3% binder respectively after moisture damage process while the elapsed time declines by 50% for mixture prepared with 5.3% binder content after moisture damage. It was concluded that the moisture damaged mixtures exhibit early stage of failure before reaching the 50% of its original flexural stiffness.

Keywords

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