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Geomechanics and Engineering
  Volume 28, Number 3, February10 2022 , pages 255-263

Suitability of bagasse ash-lime mixture for the stabilization of black cotton soil
H.N. Ramesh, Madhavi Gopal Rao Kulkarni, Mavinakere Eshwaraiah Raghunandan and Nethravathi S.

    Lime stabilization has conventionally been listed amid the key techniques of chemical stabilization. Replacing lime with sustainable agro-based by-products have gained prominence in recent decades. Bagasse ash (BA) is one such potential alternatives, an industrial waste with abundance in production, and industries exploring sustainable solutions for its safe disposal. Supplementing BA with lime could be an ideal approach to reduce lime consumption. However, suitability of BA and lime for the stabilization of expansive clays, such as black cotton (BC) soil is yet to be explored. This paper therefore aims to investigate the suitability of BA-lime mixtures to stabilize BC soil with emphasis to compaction behaviors and unconfined compressive strength (UCS) using standard laboratory procedures. Suitability of BA-lime mixture is then assessed against addition of calcium sulphate which, from previous experience, is detrimental with lime stabilization. Experimental outcomes nominate 15% BA as the optimum value observed from both compaction and UCS data, while addition of 4% lime to 15% BA showed the best results. Mineralogical and microstructural analysis show the presence of cementitious compounds with addition of lime and calcium sulphate with curing periods. While, formation of Ettringite needles were noted with the addition of calcium sulphate in BA-lime mixtures (at optimum values) after 90-day curing, and UCS results showed a decrease at this point. To this end, addition of BA in lime stabilization showed encouraging results as assessed from the compaction and UCS results. Nonetheless usage of calcium salts, with utmost emphasis on calcium sulphate and equivalent should be avoided.
Key Words
    calcium sulphate; compaction behavior; expansive clay; unconfined compressive strength
H.N. Ramesh: Faculty of Engineering - Civil, University Visvesvaraya College of Engineering, Bengaluru 560056, Karnataka, India
Madhavi Gopal Rao Kulkarni: Department of Civil Engineering, Presidency University, Bengaluru, Karnataka, India
Mavinakere Eshwaraiah Raghunandan: Civil Engineering Discipline, School of Engineering, Monash University Malaysia, 47500 Bandar Sunway, Selangor, Malaysia
Nethravathi S.: Department of Civil Engineering, R.V. College of Engineering, Bengaluru 560059, Karnataka, India

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