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Author: search.filters.author.Marathe, S.Subject: search.filters.subject.Asphalt pavements

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    Synergistic effects of natural fibres and agro-waste ash on the engineering and sustainability of stone-matrix asphalt mixes
    (KeAi Communications Co., 2025) Akarsh, P.K.; Marathe, S.; Sapal, H.K.; Akshaya Krishna, N.
    This study investigates the use of non-traditional natural fibres, specifically sisal plant fibres (SF) and coconut coir coir fibres (CCF), in Stone Matrix Asphalt (SMA) mixtures. The objective was to evaluate the optimal binder content, assess Marshall properties, and investigate drain-down, indirect tensile strength, fatigue, and rutting characteristics of the SMA mixes. Additionally, the study explores the use of sugarcane bagasse ash (SBA), an agro-waste, as a substitute for Ordinary Portland Cement (OPC), aiming to promote sustainability and waste management optimization. The research identified the optimal SMA mix with a 0.30% fibre dosage and 10% SBA, demonstrating favorable mechanical properties with Marshall stability and tensile strength ratio exceeding 90%, alongside satisfactory rutting and fatigue performance. The results showed that SF and CCF provided comparable, or even superior, performance to traditional cellulose fibres (CF), positioning them as sustainable alternatives for pavement construction. Further, a Life Cycle Cost Analysis (LCCA) was conducted on conventional and modified SMA mixes, revealing substantial long-term economic benefits. Although SMA mixes incurred slightly higher initial costs, their superior durability and reduced maintenance needs resulted in a 13.6% cost reduction for SMA-CCF and 11.1% for SMA-SF over a 20-year period. Environmental assessments confirmed that substituting synthetic fibres and OPC with SF, CCF, and SBA substantially lowered carbon emissions and enhanced sustainability, with reductions in Global Warming Potential of up to 50%. These findings highlight the potential of natural fibres and SBA in reducing costs and environmental impacts, offering a sustainable solution for future pavement construction. © 2025 Tongji University and Tongji University Press
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    Properties of Rejuvenated Reclaimed Asphalt Pavement Mixtures with Waste Glass Powder and Sisal Fibers for Pavements
    (American Society of Civil Engineers (ASCE), 2025) Marathe, S.; Akarsh, A.P.; Bhat, A.K.
    By exploring the usage of reclaimed asphalt pavement (RAP) mixtures in pavement construction, this study fills a substantial gap in the literature. The research includes a number of experimental investigations ranging from enhancing binder qualities to efficiently using waste engine oil (WEO) as a rejuvenator, as well as detailed performance evaluations using waste glass in powdered form. RAP materials were meticulously graded to provide stone matrix asphalt compositions. Throughout the study, a reinforcing supplement of 0.30% sisal fiber was utilized. The determination of optimal (fresh) binder content (OBC) of 3.50% and the selection of a lowered OBC of 2.50% with the adding of 20% WEO rejuvenator are among the preliminary key results. The study also effectively modified RAP mixes by including waste glass powder (WGP) as a mineral additive, yielding an optimal dose of 5.0% for a selected RAP mix. Performance testing on the improved RAP mixtures produced remarkable results. The Marshall stability value was increased by 20% with 5.0% WGP content. The Marshall quotient constantly fell between 2 and 5 kN=mm, which is the desired range. Tensile strength ratios often crossed 80%, and the drain-down potential was decreased by the use of WGP drastically. The combination with a 5.0% WGP content excelled the control mixture in rutting and fatigue testing and had a maximum retained Marshall stability of 93.1%. Additionally, pavement design utilizing Indian Roads Congress criteria demonstrated the viability of building pavements for low-volume roads using RAP mixtures in an efficient and sustainable manner. This study highlights the utilization of RAP to achieve sustainability in pavement building, offering a viable approach to bituminous pavement rehabilitation. © 2024 American Society of Civil Engineers.