Abstract
Damage-contributing factor of road pavement has become a concern in most of the previous studies. In some studies, it was stated that the weather and climate where the presence of water or moisture is one of the biggest factors. Thus, moisture-induced damage has been a major concern, associated with warm mix asphalt. This study analyses the moisture susceptibility of crumb rubber warm mix asphalt for both loose and compacted mixtures using imaging technique. Crumb rubber was added as dry mixtures at various crumb rubber contents and three different temperatures. Hydrated lime was added at 0 and 2%. Investigation of moisture susceptibility was performed through a series of the experiment such as Texas Boiling Test, Modified Lottman Indirect Tension adopted with Resilient Modulus analysis and Scanning Electron Microscope. The results were analysed qualitatively by using ArcGIS and through visual inspection. Quantitative analysis was performed by using MATLAB software to indicates the stripping percentage and Resilient Modulus value used to indicates the sample stiffness. From the results, inclusion of hydrated lime improved the moisture resistant. The presence of anti-stripping agent showed significant improvement asphalt mixture as most of the aggregates remain coated due to its property that improves the adhesion. The crumb rubber inclusion had a slight adverse effect as the total surface area interact with the bitumen is lesser compared to aggregate when interacting with the asphalt binder. Predominantly, stripping occured in wet samples, which eventually reduced the resilient modulus value can be further improved by incorporating the anti-stripping agent.
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The activity presented in the paper is part of the research grant (UMS/SGP 027-2017).
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Gungat, L., Ispal, N.A. (2020). Analyzing the Moisture Susceptibility of Crumb Rubber Warm Mix Asphalt Using Imaging Technique. In: Mohamed Nazri, F. (eds) Proceedings of AICCE'19. AICCE 2019. Lecture Notes in Civil Engineering, vol 53. Springer, Cham. https://doi.org/10.1007/978-3-030-32816-0_72
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