Faculty Publications
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Item Processing techniques of recycled aggregates(Elsevier, 2025) Trivedi, S.S.; Das, B.B.; Barbhuiya, S.Three essential components of every modern-day growth are preservation of natural aggregate resources, green construction, and the safeguarding of the environment. One such endeavor is the incorporation of recycled aggregate (RA) in concrete. Because of the issues with its strength and durability, the use of RA is typically limited to inferior load constructions. With appropriate management and effective processing methods, the application can be expanded to high-strength concrete. In the present manuscript, the current C&D waste management practices adopted by various nations are highlighted alongside different in-action legislations are thoroughly reviewed for developing an understanding about the basic elements involved in the debris management. In addition, some of the latest and novel recycling approaches are investigated such as autogenous cleaning method, air and hydraulic jigging technologies, and advanced dry recovery system. To investigate the nature of RA processed from aforementioned technologies, the inherent properties of aggregates such as specific gravity, water absorption, density, and abrasion values alongside microstructure performance through scanning electron microscopy (SEM) are comprehensively reviewed and presented. Based on the extensive investigation, it is recognized that effective C&D waste management can be accomplished using certain techniques such as circular procurement and green construction. Furthermore, there is a requirement for specified processing methods that enhances the physio-chemical properties. Also, the surface morphology can be improved using combined crushing and ball milling approaches. Overall, it is recommended to implement vertical shaft crushing and ball milling for the development of fine RA whereas for the coarse RA fractions, multistage jaw crushing and advanced dry recovery (ADR) system are some of the finest processing approaches. © 2025 Elsevier Ltd. All rights reserved.Item A comprehensive review towards sustainable approaches on the processing and treatment of construction and demolition waste(Elsevier Ltd, 2023) Trivedi, S.; Snehal, K.; Das, B.B.; Barbhuiya, S.A massive boom in global construction has led to an enormous generation of construction and demolition (C&D) waste. C&D waste is the largest stream of waste, which needs to be treated and utilized efficiently for achieving sustainable goals. Multiple economical and valuable materials are embedded in C&D waste, most of these can be reused as construction materials. Ideally, these wastes are processed or treated near the demolition sites to ensure a constant supply of raw materials such as recycled aggregates for its use in the construction of roads, buildings, and urban landscapes. Several challenges are posed in the processing and treatment of C&D waste as a result of variable material properties as well as its bulky nature. From this point of view, this article presents a structured, comprehensive review of the existing literature on various tools and techniques for procuring recycled aggregates (RA) from C&D leftovers. The latest processing technologies, and subsequent treatment processes for recycled aggregates to make it suitable for further use in concrete is discussed and critically analyzed. Also, diverse approaches for treating the RA are evaluated critically with prime focus on removal of adhered mortar fractions and surface coating techniques. In addition, the modified mixing approach and its implementation in mix design for RA based concrete is emphasized. This article also covers the studies on recycled aggregate concrete at microstructural level, which include characterization techniques such as SEM-EDAX, XRD, FTIR and TGA. Emphasis is also given to embrace the deficiencies associated with RA concrete and improvement techniques for its inclusion in construction works. On the basis of the extensive review, it is understood that subjected to processing of the C&D debris, it yields useful recycled aggregates that can be incorporated into concrete up to an optimum percentage between 15 and 20%. Further, there is a requirement for specified pre-treatment methods that enhances the physio-chemical properties. Also, there is a necessity for the assimilation of mineral admixtures of micron, sub-micron to nano size for overcoming the shortcomings of recycled aggregates for the production of sustainable and high-performance concrete. © 2023 Elsevier LtdItem A comprehensive review on integrating sustainable practices and circular economy principles in concrete industry(Academic Press, 2024) Barbhuiya, S.; Das, B.B.; Adak, D.This comprehensive review explores the integration of circular economy principles into the concrete industry, emphasizing their role in enhancing sustainability and resource efficiency. It covers the fundamental concepts of circular economy and examines the application of Life Cycle Assessment (LCA) in evaluating the environmental impacts of concrete production. The review highlights innovative strategies for recycling, reuse, waste reduction, and resource optimisation, showcasing how these approaches can transform concrete production practices. It also addresses the policy considerations, economic implications, and societal impacts associated with adopting circular economy practices. Furthermore, the review investigates recent technological advancements in circular concrete production, including self-healing concrete and 3D printing. By summarizing these findings and offering practical recommendations, the review aims to support the industry in transitioning towards more sustainable practices. This detailed analysis provides valuable insights into the benefits and challenges of circular economy adoption, helping stakeholders make informed decisions for a greener concrete sector. © 2024 The AuthorsItem Roadmap to a net-zero carbon cement sector: Strategies, innovations and policy imperatives(Academic Press, 2024) Barbhuiya, S.; Das, B.B.; Adak, D.The cement industry plays a significant role in global carbon emissions, underscoring the urgent need for measures to transition it toward a net-zero carbon footprint. This paper presents a detailed plan to this end, examining the current state of the cement sector, its carbon output, and the imperative for emission reduction. It delves into various low-CO2 technologies and emerging innovations such as alkali-activated cements, calcium looping, electrification, and bio-inspired materials. Economic and policy factors, including cost assessments and governmental regulations, are considered alongside challenges and potential solutions. Concluding with future prospects, the paper offers recommendations for policymakers, industry players, and researchers, highlighting the roadmap's critical role in achieving a carbon-neutral cement sector. © 2024 The Author(s)Item Structural performance and implementation challenges of next-generation concrete materials(Elsevier Ltd, 2025) Barbhuiya, S.; Das, B.B.; Rajput, A.; Katare, V.; Das, A.K.Conventional concrete faces limitations in durability, sustainability, and adaptability to modern structural demands, constraining its use in high-rise, bridge, and extreme-environment applications. This study examines emerging concrete mixes—HPC, UHPC, SCC, FRC, GPC, and 3D-Printed Concrete—by evaluating their mechanical properties, implementation challenges, and future opportunities. A review of experimental data, case studies, and comparative analyses was conducted to assess strength, durability, workability, and structural applications. Results show that HPC and UHPC reach compressive strengths of 60–200 MPa, GPC achieves 40–80 MPa with reduced CO₂ emissions, SCC demonstrates slump flows of 600–800 mm, and fibre reinforcement enhances tensile strength to 8–15 MPa. These findings highlight superior performance, sustainability, and constructability, though high costs, lack of standards, and scalability issues remain obstacles to widespread adoption. This review uniquely integrates comparative insights on High-Performance, Ultra-High-Performance, Self-Compacting, Fibre-Reinforced, Geopolymer, and 3D-Printed concretes, bridging laboratory findings with real-world applications. Unlike existing reviews, it emphasizes structural implementation challenges and opportunities. Key obstacles—including high cost, lack of standards, and scalability—are outlined to contextualize pathways for sustainable adoption. Overall, next-generation concretes deliver enhanced strength, durability, and sustainability, making them viable for critical infrastructure. Future studies should focus on advancing standardization, integrating nanotechnology and AI for mix optimization, and developing cost-effective, large-scale deployment strategies. © 2025 The Authors