Abstract
It is evident that transportation has an enormous impact on the U.S. economy, and on the lives of its residents. Pavement conditions deteriorate over time because of the combined effects of traffic and climate. Exposure to moisture often causes premature failure of asphalt pavements as it reduces the stiffness of the asphalt and enable stripping of the asphalt from the aggregate. A laboratory study to evaluate the use of recycled waste additives in reducing moisture damage in Hot Mix Asphalt (HMA) was conducted. Two recycled waste additives (Fly Ash and Cement Kiln Dust) along with Hydrated Lime were investigated. These additives were added to the mix in three different application methods; namely Saturated Surface Dry (SSD), slurry and dry methods. The SuperPave mix design was adopted and moisture susceptibility was tested by employing Modified Lottman Test (AASHTO T 283). For all the modified mix combinations tested in this study the standard Tensile Strength Ratio (TSR) ratio exceeded the 80% threshold. However, when TSR was calculated as a ratio of the Indirect Tensile Strength (ITS) of the unmodified/unconditioned mix, several mixes failed to pass the 80% TSR threshold. Peak amount of additives for both recycled waste additives and hydrated lime were observed in this study. In terms of TSR, mixes modified using the SSD application method performed the best, followed by mixes modified using the slurry application and dry application method, respectively. Cement Kiln Dust and Hydrated Lime proved to be cost effective as compared with Fly Ash additives investigated in this study.
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Acknowledgements
This paper includes a portion of study titled “Reducing Moisture Damage in Asphalt Mixes Using Recycled Waste Additives” which was sponsored by the Leonard Transportation Center. The contents of this paper reflect the views of the authors and do not necessarily reflect the official views or policies of the Leonard Transportation Center. This paper does not constitute a standard, specification or regulation. Also, the authors thank CalPortland Construction for providing the aggregate and CKD, Oxnard refinery for supplying asphalt binder and Headwaters Resources for supplying Fly Ash.
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Rahim, A., Boyes, A., Saadeh, S. (2023). Use of Recycled Waste Additives to Reduce Moisture Damage in Asphalt Mixes. In: Mosallam, A.S., El Bhiri, B., Karbhari, V.M., Saadeh, S. (eds) Advances in Smart Materials and Innovative Buildings Construction Systems. ICATH 2022. Sustainable Civil Infrastructures. Springer, Cham. https://doi.org/10.1007/978-3-031-47428-6_18
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