Abstract
The objective of this study was to investigate the rutting performance of gap-graded aggregate gradations in conjunction with the effect of asphalt binder. Two gap-graded aggregate gradations recommended by Arizona Department of Transportation (ADOT: gradation A), Texas DOT (gradation B), and one newly proposed gradation (gradation C) were considered in this study. Wheel-tracking test was performed at 60 °C on ten asphalt mixtures, and rut depth was statistically analyzed using 23 factorial designs at 95% confidence interval. Main effect analysis showed that gradation C offered the highest rutting resistance followed by gradation B and A. Though the gradation A demonstrated a reduction in rutting resistance with increasing binder content, gradations B and C were less sensitive to variation in the binder content. Rutting characteristics estimated at different stages revealed that permanent deformation incurred in gradation A developed rapidly until 75% and then retarded to a stable rate. In the case of gradations B and C, there was a marginal difference in the permanent deformation at various stages. Further, gap-graded asphalt mixtures prepared with gradations B and C at both (OBC − 1) and OBC % showed better performance than conventional dense-graded (DG) asphalt mix. Overall, it was concluded that gap-graded mixture can be expected to outperform the DG mix when designed with appropriate mix parameters.
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Acknowledgements
The authors gratefully acknowledge the Government of India Department of Science and Technology for their financial support vide Science and Engineering Research Board (SERB) research project grant number DST No: SERB/F/2670/2014-15 dated 17 July 2014.
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Venudharan, V., Biligiri, K.P. (2020). Investigation on Rutting Performance of Gap-Graded Asphalt Mixtures: Study on Aggregate Gradation. In: Mathew, T., Joshi, G., Velaga, N., Arkatkar, S. (eds) Transportation Research . Lecture Notes in Civil Engineering, vol 45. Springer, Singapore. https://doi.org/10.1007/978-981-32-9042-6_62
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