VALORISING CORN COB ASH AND BAMBOO LEAF ASH AS FILLERS IN ASPHALTIC CONCRETE
Abstract
The study investigated the performance characteristics of asphaltic concrete incorporating Corn Cob Ash (CCA) and Bamboo Leaf Ash (BLA) as partial replacements for conventional filler materials. Marshall Stability, Flow, and Marshall Quotient, were conducted to evaluate the properties of the asphalt mix. The results showed that the index properties of aggregates and bitumen met standard specifications, leading to an optimal mix design of 65.7% coarse aggregate, 7% fine aggregate, 21% filler, and 6.3% bitumen content. The stability and flow values increased with CCA-BLA proportion, reaching peak stability of 20.9 kN, a flow of 3.4 mm, and a Marshall quotient of 6.1 KN/mm at 30% ash replacement (50% CCA, 50% BLA). This composition exhibited superior rutting resistance and mechanical performance. The study concluded that incorporating agricultural waste materials as fillers enhances asphalt Stability and aligns with sustainable construction practices. The research recommends 50% SDA and 50% BLA at 30% combined ash replacement for natural filler substitution in Nigerian asphalt production. Additionally, further field research is suggested to examine the long-term performance and durability of CCA-BLA-modified asphalt. This innovative approach promotes cost-effective, eco-friendly solutions in road construction while reducing reliance on conventional fillers.
KEYWORDS: Asphaltic concrete, Corn Cob Ash, Bamboo Leaf Ash, Marshall Stability, Sustainable Development Goal
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