Faculty Publications

Permanent URI for this communityhttps://idr.nitk.ac.in/handle/123456789/18736

Publications by NITK Faculty

Browse

Author: search.filters.author.Das, B.B.Subject: search.filters.subject.Self-compacting

Search Results

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Performance characteristics of self-compacting concrete containing lateritic fine aggregate as a partial replacement to natural river sand
    (Institute of Physics, 2024) Kiran Bhat, K.; C, C.; Das, B.B.
    This study identifies the use of processed lateritic fine aggregate (LFA) as a sustainable material for the replacement of natural fine aggregate (NFA) in self-compacting concrete (SCC). Cubes were cast with LFA replacements from 10% to 80% with an interval of 10% for checking the compressive strength development at 28 and 90 days. The findings demonstrate that the replacement of 30% NFA with LFA leads to the optimum performance, resulting in compressive strengths of 45.5 MPa and 53 MPa after 28 and 90 days of curing. Similar trends are also noted with the specimens cast for splitting tensile and flexural strengths as per IS 516: 2021. Scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), Thermogravimetric analysis (TGA), and Fourier Transform Infrared Spectroscopy (FTIR) were performed to understand the surface morphology, material characterization, and composition differences between the control mix (C30F) and optimized lateritic SCC (C30F30L). SEM and EDX analysis demonstrated the contribution of the introduced fly ash particles to the strengthening of concrete. TGA with DTA has shown the more complicated denser structure of the C30F mix, and FTIR has confirmed the presence and formation of the C-S-H gel. Si-O-Si asymmetric stretching band has extra peaks, and with FTIR, O-C-O asymmetrical bending and stretching wave band have a lower intensity than the C30F mix due to the partial replacement of LFA. In addition, it is also observed from the durability studies that C30F30L showed an increase in pore volume and capillary pore network compared to C30F mix. © 2024 The Author(s). Published by IOP Publishing Ltd.
  • No Thumbnail Available
    Item
    Enhancing sustainability with ternary blended cement and fine aggregate in self-compacting lateritic concrete with supplementary materials
    (Elsevier Ltd, 2025) Kiran Bhat, K.; C, R.; Das, B.B.
    This study explores an innovative approach to sustainable self-compacting concrete (SCC) by partially replacing natural fine aggregate (NFA) with lateritic fine aggregate (LFA) and manufactured sand (M-sand). Additionally, fly ash and ultrafine ground granulated blast furnace slag (UGGBS) were introduced as supplementary cementitious materials to enhance performance. Fresh properties of the SCC mixes met as per Indian standards, demonstrating satisfactory flowability, passing ability, and stability. Among the mixes, the combination of 30 % fly ash (30 F), 30 % LFA (30 L) and 50 % M-sand (50 M) replaced in the conventional SCC mix, designated as C30F30L50M, exhibited optimal workability and segregation resistance. Mechanical tests revealed improvements in long-term strength, with the optimized mix containing 5 % UGGBS showing superior flexural strength at 90 days. Durability assessments indicated increased water absorption in mixes containing LFA and M-sand, while the control mix displayed better resistance to chloride penetration. Microstructural analyses (SEM, XRD, TGA/DTG, and FTIR) confirmed enhanced hydration and phase development influenced by the blend of fine aggregates and supplementary materials. The findings highlight the potential of utilizing LFA and M-sand in SCC to achieve sustainable concrete with improved performance characteristics. © 2025 The Authors