In 2006, a research study was sponsored by the Regional Transportation Commission (RTC) of Washoe County to assess the impact of lime treatment andthe method of adding the lime on the moisture damage of hot mix asphalt (HMA) mixes in the Truckee Meadows region. This paper documents the results of a laboratory evaluation of lime application, marinated or not, in HMAmixtures, a mechanistic analyses of the results, and an evaluation of plant produced HMA mixtures to evaluate the variability of moisture susceptibility with the two lime application methods. The laboratory evaluation based upon resilient modulus testing detected moisture sensitivity benefits with the use of lime through multiple F-T cycles , but could not adequatelydistinguish between the marinated and non-marinated mixtures. The mechanistic analysis exhibited utilizing the tested resilient modulus values similar results in terms of lime or no lime present and showed slight signs of improvement in with the marination process over the non-marinated, though much of the differences were hidden by the use of a polymerized binder.The field variability based upon tensile strength and tensile strength ratios indicated that the marination process does in fact reduce the variability of the moisture sensitivity benefits with both polymerized and neat binders.
Samenvatting