Conference Papers

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    Production of Artificial Aggregates Using Industrial By-Products Admixed with Mine Tailings—A Sustainable Solution
    (Springer Science and Business Media Deutschland GmbH, 2021) Sharath, B.P.; Das, B.B.
    This experimental cum research exploration is focused on the production of artificial aggregates with an adoption of pelletization technique. The influential factors for ascertaining the efficiency of the production process are nature of binding agent, required moisture content, process duration and dosage of alkali binder. Aggregates were produced in various combinations including the industrial by-products replaced partially by mine tailings with the addition of some percentages of lime. These produced aggregates were analysed for their engineering properties. It was observed that with the utilization of these mine tailings in this production of artificial aggregates have given an enhancement in the basic characteristic properties of the produced aggregates which are nearly comparable to that of natural aggregates. © 2021, Springer Nature Singapore Pte Ltd.
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    Effect of Ggbs on Strength of Aluminium Refinery Residue Stabilized by Alkali Solution
    (Springer Science and Business Media Deutschland GmbH, 2021) Kudachimath, N.; Mulangi, R.H.; Das, B.B.
    In the present study aluminium refinery residue (ARR), that is, solid waste generated in the production of alumina also known as red mud, was stabilized with ground granular blast furnace slag (GGBS), silica modulus and Na2O content. The prime chemical composition of aluminium refinery residue is Fe2O3, Al2O3, SiO2 and Na2O. ARR is a highly alkaline waste. This study describes laboratory study, and the characterization of ARR can be utilized in the materials which are used for road construction. The unconfined compression strength tests were conducted on various proportions of mixes of ARR and GGBS 80% + 20%, 75% + 25% and 70% + 30% and silica modulus (0.5, 1 and 1.5) for different Na2O content. The UCS specimens were cured for 0, 7 and 28 days to observe the effect of longstanding curing. Based on the laboratory investigations, it was found that 75% ARR + 25% GGBS with 4% Na2O content increases MDD and decreases OMC content. The most appropriate mix 75% AAR + 25% GGBS with 1 silica modulus was observed with a 308.6% increase in UCS value for 28 days of curing. Higher strength is achieved if longer curing periods allowed. © 2021, Springer Nature Singapore Pte Ltd.
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    Utilization of GGBS-Based Geopolymer Lateritic Soils for Sustainable Pavements
    (Springer Science and Business Media Deutschland GmbH, 2023) Thotakura, T.V.; Sunil, B.M.; Venkata Rao, M.V.
    Nowadays geopolymers have been recognized as eco-friendly materials as well as potential replacement of ordinary Portland cement (OPC) and lime, which are cementitious materials with three-dimensional tetrahedral frameworks of Al and Si. This paper presents experimental investigation on compaction characteristics such as optimum moisture content (OMC) and maximum dry density (MDD) and unconfined compressive strength (UCS) of a lateritic soil chemically altered with alkali activator along with precursor as ground granulated blast furnace slag (GGBS) with varying amounts of GGBS content. GGBS was added to the lateritic soil up to 30% in increments of 5%. Scanning electron microscopy (SEM) was undertaken on the geopolymer blends to know the micro-structural behaviour and chemical compounds. The results revealed that the unconfined compressive strength (UCS) of the GGBS-based geopolymer soils improved with addition of GGBS content. The micro-structural analysis confirmed the both pozzolanic reaction and ionic exchange takes place in the alkali-activated lateritic blends. The impetus for the utilization of geopolymers can be consuming GGBS in large quantities in their synthesis with the potential to reduce the use of high carbon footprint ordinary Portland cement. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.