Department of Civil Engineering

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Author: search.filters.author.Barai, Sudhir KumarSubject: search.filters.subject.Life cycle assessment

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    Performance assessment and life cycle analysis of concrete containing ferrochrome slag and fly ash as replacement materials – A circular approach
    (Elsevier, 2022-09) Barai, Sudhir Kumar
    Climate change mitigation and resource efficiency have emerged as crucial challenges for long-term sustainability of concrete. Implementing circular approach through waste valorisation in concrete production with eco-efficient mix design is an efficient mitigation pathway to combat natural resources depletion and environmental issues. This paper investigates techno-environmental sustainability of concrete utilizing 100% ferrochrome slag as alternate coarse aggregate and fly ash as partial cement substitute (0–40%) adopting particle packing optimization technique (PPOT) as a sustainable mix design method. Total of ten types of concrete mixtures were prepared using the alternate materials and mix design methods (PPOT and IS:10262(2009)). Natural aggregate concrete prepared by IS:10262(2009) mix design was considered as the reference mixture. Technical assessment of concrete was performed experimentally in terms of compressive strength and tensile strength. Environmental performance was investigated through life cycle assessment (LCA) as per ISO 14040-44 guidelines using cradle-to-gate system boundary and two functional units: 1 m3 concrete and 1 MPa compressive strength. Results revealed that ferrochrome slag aggregate concrete (FCSAC) containing fly ash up to 30% prepared by PPOT has enhanced strength than reference concrete. Regardless of the functional units used, FCSAC with 30% fly ash designed by PPOT was ranked as the most sustainable mix with significant environmental savings (around 50–70%) without compromising desired requirements. Sensitivity analysis was performed by varying transportation distance, mode of transport and energy mix. Results showed that FCSAC with 30% fly ash is not sensitive to the scenarios investigated. The outcomes will be helpful for decision-makers to develop policy directives and frameworks on synergistic use of ferrochrome slag and fly ash towards concrete sustainability.
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    Influence of mechanical properties and CO2 emissions on the optimization of self-compacting based hybrid fiber reinforced concrete
    (Elsiever, 2021-03-10) Barai, Sudhir Kumar; Pradhan, Subhasis
    The paper deals with the development of high-performance self-compacting based concrete and optimization of the mix by accounting both mechanical and sustainability characteristics. Taguchi’s L16 orthogonal array is followed to consider 16 concrete mixes in combination of additives as four levels are considered for each additive/factor (class F type of fly ash, colloidal nano silica, crimped steel fiber, and polypropylene fibers). The global warming potential (GWP) is also estimated to account the sustainability parameter. To determine the optimized concrete mix satisfying both performance and sustainability characteristics the normalizing indices are used by accounting: (a) compressive strength and GWP, (b) split tensile strength and GWP, (c) flexural tensile strength and GWP, and (d) compressive strength, split tensile strength, flexural tensile strength and GWP. A detail comparison of normalizing indices is conducted, and the optimized concrete mix is determined based on the average rankings obtained from different normalizing index.