Abstract
The performance of a flexible pavement depends on its resilient response from the supporting structural layers, which include dense bitumen macadam, base and subbase layers. The use of reclaimed asphalt pavement (RAP) materials in pavement base course layer has proven alternative under the sustainability framework. Since the RAP is an inferior material, it needs to be stabilized with cementitious materials and ascertain their resilient behavior. In this present study, a high percentage of RAP stabilized with alkali-activated fly ash (FA) was considered as an alternative to 100% virgin aggregate (VA) and sustainable pavement base material. The proposed alkali activation is expected to enhance the reactivity of FA with time. The resilient modulus (Mr) and unconfined compressive strength (UCS) of various mixes were examined. The results show that the resilient behavior of RAP can be enhanced by about fourfold when an optimum stabilizer is adopted. A 12-fold increase in UCS is observed with an LAA ratio of 50:50. Based on the wide range of Mr test data, design charts were proposed to determine the stabilized reclaimed bases for flexible pavements.
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Saride, S., Jallu, M. (2021). Resilient Behavior of Stabilized Reclaimed Bases. In: Sitharam, T., Jakka, R., Kolathayar, S. (eds) Latest Developments in Geotechnical Earthquake Engineering and Soil Dynamics. Springer Transactions in Civil and Environmental Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-16-1468-2_22
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