Effects of deicing agents on moisture susceptibility of the WMA containing recycled crumb rubber

The freezing of pavement's surface is a common phenomenon in a cold area; therefore, it is essential to use the deicing agent to solve this problem. A number of researches have been conducted recently on the aformentioned issue, however, the moisture susceptibility of WMA asphalt mixtures containing recycled crumb rubber in cold regions and damages related to the application of Deicing materials have not been evaluated. Therefore, the aim of this research is evaluating the effects of deicing salts including Calcium Chloride, Sodium Chloride and Magnesium Chloride on the moisture susceptibility of Warm Mix Asphalt (WMA) mixture incorporating recycled crumb rubber (RCR). In this study. WMA asphalt mixtures incorporating 0%,1%, 3%, and 5% RCR by the weight of fine aggregate were tested. Moreover, two types of bitumen, with and without an anti-stripping agent, were used in this study. Various tests, including the Marshall Stability test, moisture susceptibility (Texas Boiling Water, Pull-off Adhesion Test, and Indirect Tensile Test) were performed for evaluating the asphalt specimens. The obtained results showed that the Calcium Chloride solution had less detrimental effects on the asphalt specimens compared with the other deicing solutions. Moreover, the dry process for incorporating the recycled crumb rubber (RCR) in WMA asphalt mixtures improved the water resistance properties of the asphalt mixtures only with the addition of an anti-stripping agent to the bitumen. (C) 2019 Elsevier Ltd. All rights reserved.