Conference Papers

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Author: search.filters.author.Chiranjeevi, K.Has files: No

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    Soil Stabilization Using Spent Coffee Residue with Geopolymerization Technique
    (Springer Science and Business Media Deutschland GmbH, 2024) Lalfakzual; I Talkeri, H.T.; Raghuram, K.C.; Chiranjeevi, K.
    Spent coffee residue contains a significant amount of biodegradable material and is extremely organic. This study aims to assess the feasibility of blending the soil with spent coffee residue and industrial by-products such as fly ash and slag through a sustainable approach using the geopolymerization technique. Geopolymerization was induced using fly ash (FA) and slag as precursors with sodium hydroxide and sodium silicate as alkaline activators. Modified compaction was investigated to determine the optimum moisture content and bearing strength of the mixes produced. The Taguchi's L-9 orthogonal array served as the foundation for the formulation of all nine geopolymer mixes created herein. In an initial calibration phase, the durability and unconfined compressive strength (UCS) characteristics of a set of nine mixes were utilized for performance evaluation. On the basis of these findings, strength and durability prediction equations were developed. In the prediction phase, the accuracy of the developed model is evaluated with actual test results from trials on the nine mixes. Partial replacement of slag by 20 and 30% with the desired sodium oxide content range between 3 and 5% complied with the standard for subgrade material. Test results indicate stabilized coffee residue might be used as subgrade material rather than being dumped in landfills. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.
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    Utilization of Recycled Concrete Aggregates Processed Using the Ball Milling Method in Cement-Treated Bases for Pavements
    (Springer Science and Business Media Deutschland GmbH, 2024) Chiranjeevi, K.; Kumar, D.H.; Kumar, A.J.; Thapas, N.D.S.; Ravi Shankar, A.U.
    Pavement construction and maintenance have become very common worldwide as traffic volumes and vehicular axle weights continue to rise as the global population grows and technology advances. The extensive utilization of natural resources implies that their existence for long-term availability cannot be assured. Using materials from the various damaged and collapsed structures will save money and find a solution to the trash disposal issue. These materials have inferior engineering properties compared to conventional materials and cannot be used directly in pavement applications. These materials must be processed or stabilized by mechanical and chemical stabilization techniques. Processing of Recycled Concrete Aggregates (RCAs) has gained more importance in improving the physical properties. In the current investigation, construction and demolition (C&D) waste was processed in two stages successively. In the first stage, C&D waste was subjected to manual crushing and further processed through jaw crushing. The aggregates were processed through ball milling in the second stage. The natural aggregates are entirely replaced with the RCA in cement-treated bases (CTBs) at 3, 5, and 7% stabilization levels. Mechanical and durability properties were evaluated. The RCA produced from the ball milling method performs better than the unprocessed RCA. The mix having 7% cement content with processed RCA met the specifications for CTB. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.
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    Utilization of Ferrochrome and Recycled Concrete Aggregates for Sustainable Pavement Base Layers—A Laboratory Study
    (Springer Science and Business Media Deutschland GmbH, 2025) Chiranjeevi, K.; Kumar, D.H.; Yatish, R.G.; Talkeri, H.T.; Mulangi, R.H.; Ravi Shankar, A.U.
    The paramount importance of incorporating alternative aggregates cannot be overstated, as it plays a pivotal role in resource conservation, sustainability promotion, and efficient waste management. This study focuses on the utilization of ferrochrome aggregate (FCA) and recycled concrete aggregate (RCA) within cement-treated base layers, aiming to entirely substitute natural coarse aggregate (NCA). The research meticulously fabricated cement-treated recycled and ferrochrome aggregate (CTRFA) samples with cement contents of 3, 5, and 7%. These specimens incorporated varying blends of RCA and FCA, ranging from 0 to 100%. In this investigation, strength properties such as unconfined compressive strength (UCS), flexural strength, elastic modulus, and indirect tensile strength (ITS) were performed alongside durability. The experimental results indicated that the cement content exerted a more pronounced influence on both strength and durability. The CTRFA mixes containing 50% RCA, 50% FCA, and 5% cement meet IRC 37 2018 strength and durability standards and can be used as a base layer for flexible pavement instead of conventional cement-treated base (CTB). © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.