Abstract
Moisture damage is a frequent distress on pavements and is considered as a major contributor to premature deterioration. Rubberized warm-mix asphalt, a sustainable pavement mixture, is a promising alternative to control moisture damage like stripping, which is a phenomenon that arises due to the loss of bond between asphalt binder and aggregate under traffic loading in the presence of moisture. In this research, an organic additive, cashew nut shell liquid (CNSL), at an optimum dosage of 2% by weight of the bitumen was used to modify natural rubber-modified bitumen (NRMB), and it was used to prepare Dense Bituminous Macadam (DBM). A comparison of moisture susceptibility characteristics of both natural rubber-modified hot-mix asphalt (RHMA) and natural rubber-modified warm-mix asphalt with CNSL additive (RWMA) was done. Indirect tensile strength of conditioned samples of RWMA was 23.3% greater than that of RHMA. The tensile strength ratio (TSR) of RWMA was 13.5% more than that of RHMA and also satisfied minimum requirement of 80% for a mix to be moisture resistant according to the Ministry of Road Transport and Highways (MoRTH) 2013 due to the anti-stripping property of the additive, CNSL. The statistical analysis validates the experimental investigations. ANOVA analysis for tensile strength ratio revealed that type of mix had a significant influence on moisture damage resistance of bituminous mix.
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Joseph, M.S., Bindu, C.S. (2021). Moisture Sensitivity Characteristics of Rubberized Warm-Mix Asphalt with Cashew Nut Shell Liquid. In: Biswas, S., Metya, S., Kumar, S., Samui, P. (eds) Advances in Sustainable Construction Materials. Lecture Notes in Civil Engineering, vol 124. Springer, Singapore. https://doi.org/10.1007/978-981-33-4590-4_3
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DOI: https://doi.org/10.1007/978-981-33-4590-4_3
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