Effectiveness of Loaded Wheel Tracking Test to Ascertain Moisture Susceptibility of Asphalt Mixtures

Moisture damage of asphalt mixtures is a major distress affecting the durability pavements. The loaded wheel tracking (LWT) test gaining popularity in determining moisture because its ability to relate laboratory performance field performance. However, accuracy LWT’s “pass/fail” criteria for screening limited. objective this study was evaluate capability LWT identify susceptibility with different conditioning protocols. Seven 12.5 mm two binder types (unmodified PG 67-22 and modified 70-22), three aggregate (limestone, crushed gravel, semi-crushed gravel) were utilized. Asphalt mixture samples subjected five levels, namely, control; single freeze–thaw-; triple MiST 3500 cycles; 7000 cycles. Frequency sweep at multiple temperatures frequencies, stress creep recovery tests performed binders. used samples. Freeze–thaw resulted an increase stiffness binders as compared control. Further, freeze–thaw rut depth control mixture. protocols evaluated effective exposing moisture-sensitive mixtures, which initially showed compliance Louisiana design specifications.