Abstract
Scarcity of natural resources is increasingly encountered around the world because of the increasing population. Fly ash is one of the problematic waste materials being generated in very large quantity in India by thermal power plants. The use of fly ash in road base, subbase, and subgrade layer provides an opportunity to use high volumes of the materials. In this study, engineering properties of different fly ash-lime (FAL) mixes and fly ash-cement (FAC) mixes were investigated for their effective use as subbase material for flexible pavements. The effect of binder content and curing period on unconfined compressive strength (UCS), CBR, and resilient modulus for all the mixes was studied. Fly ash with minimum 6% lime content and fly ash with minimum 6% cement content satisfy the minimum strength criteria recommended by Indian Road Congress (IRC) for their use in subbase layer. The resilient modulus of these mixes was found to be higher than that of conventional granular subbase (GSB). Finite element analyses of a five-layer flexible pavement system are carried out and the service life ratio of FAL and FAC mixes in relation to the conventional GSB layer is evaluated.
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