Browsing by Author "Thotakura, V."

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    Assessment of Seismic Liquefaction of Soils Using Swarm-Assisted Optimization Algorithm
    (Springer Science and Business Media Deutschland GmbH, 2021) Thotakura, V.; Durga Prasad, C.D.; Chaudhary, B.; Sunil, B.M.
    Assessment of liquefaction potential of soils due to the earthquake has been carried out in this research using the nature-inspired Metaheuristic swarm-assisted algorithm (PSO). An assessment has been made on the basis of actual field data from the previous research. The field data consists of 59 sets having variables of total stress of soil (⌠o), effective stress of the soil (⌠′o), percentage fines, mean size of soil particles (D50), standard penetration value (SPT), the equivalent dynamic shear stress (Tav/⌠′o), maximum horizontal acceleration at ground surface (a/g) and the earthquake magnitude (M). PSO-based models were developed for both single variable and multivariable linear approaches. The results revealed that for the assessment of liquefaction of soils, the developed PSO models perform good estimations in terms of the errors and convergent solution. And also, with a damping coefficient and varying input variables, there is a significant improvement in the best solution. These developed models can be useful for practicing engineers in the field. © 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
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    Compressive Strength of High Plastic Clay Stabilized with Fly Ash-Based Geopolymer and Its Synthesis Parameters
    (Springer Science and Business Media Deutschland GmbH, 2021) Neeraj Varma, N.; Kumar, T.; Thotakura, V.
    Geopolymerization is an effective technique for utilizing industrial solid waste material as stabilizing material. This paper studies the effect of class-F fly ash-based geopolymer on compressible strength characteristics of high plastic clay using unconfined compression strength (UCS) test. Sodium silicate and sodium hydroxide were used as alkali activators in proportions of 60:40, respectively. The fly ash content was varied by 0, 10, 20 and 30% by dry weight of soil, and alkali activator was varied by 5, 10 and 15% by dry weight of soil–fly ash mix. UCS tests were carried out on the specimens contaminated under controlled curing environment. Unconfined compression strength increased with increase in fly ash and liquid activator content. The maximum UCS value of 790 kPa observed at 30% of fly ash content under elevated temperature of 50 °C. The influence of Si/Al and Na/Al ratios on compressive strength of geopolymeric materials was also identified. Further, numerical analysis was carried out to check the significance of factors effecting the compressive strength of the material. © 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
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    Furfural-Extracted Corncob Ash: A New Geomaterial for Sustainable Construction
    (Springer Science and Business Media Deutschland GmbH, 2024) Thotakura, V.; Venkata Rao, M.V.; Sunil, B.M.; Chaudhary, B.
    Nowadays, globally rapid increase in the production and demand of furfural oil due to its many viable properties and best alternative to petroproducts. Furfural-extracted corncob ash (FECA) is a residue generated from the furfural production industry. However, during the furfural extraction process, the bulk of corncob ash was developed, and dumping the residue poses an environmental threat. This paper presents the efficacy of the FCEA as a geomaterial in construction. A series of tests was conducted on FCEA blended clays to determine free swell index, compaction, and California bearing ratio (CBR) tests. Maximum dry densities and CBR values were significantly improved with an increase in FCEA content. The test results indicate that the FECA is a desirable material for construction activities. The paper also explores the potential selection of better geomaterial for construction. Because in most cases, the choice of additives predominantly relies on the engineering properties of the material. Such an exposition may cause an increased cost of the project due to the cost of the selected geomaterial. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.
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    Swell-Compressibility Behavior of Geopolymer Blended Expansive Clays
    (Springer Science and Business Media Deutschland GmbH, 2021) Thotakura, V.; Sunil, B.M.; Chaudhary, B.
    This paper presents the influence of GGBS-based geopolymer on swell-compressibility characteristics of oven-dry, expansive clay passing 4.75 mm sieve. One-dimensional swell-consolidation tests were conducted on the expansive clay passing through 4.75 mm sieve to which GGBS was added at 0, 5, 10, 15, and 20% by dry weight of the clay. Rate of heave, swell potential, swelling pressure, and linear shrinkage were evaluated. Rate of heave and swell potential decreased significantly with increase in GGBS content. The paper also explores the microstructure behavior and surface texture of the GGBS-based geopolymer–clay blends using the scanning electron microscopy (SEM). The SEM results revealed that the higher Si/Al compounds increase the dense phase of geopolymer products. Moreover, geopolymer synthesis can contribute to the bulk utilization of industrial by-products. © 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.