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Author: search.filters.author.Amulya, A.Subject: search.filters.subject.Silicates

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    Stabilisation of lithomargic clay using alkali activated fly ash and ground granulated blast furnace slag
    (Taylor and Francis Ltd. michael.wagreich@univie.ac.at, 2020) Amulya, A.; Ravi Shankar, A.U.; Praveen, M.
    A suitable ground improvement technique is essential in order to confront the problems associated with lithomargic clay for road construction. The efficacy of alkaline solutions such as sodium hydroxide and sodium silicate along with class F fly ash and Ground Granulated Blast Furnace Slag (GGBS) as additives to improve the properties of lithomargic clay is examined. The different mixes are prepared by replacing the soil with 20%, 30%, and 40% of GGBS and fly ash. The Maximum Dry Density (MDD) obtained from the soil replaced with 40% GGBS and for the soil replaced with 30% fly ash. An activator modulus of 1.25 is kept constant for the varying sodium oxide dosage at 2, 3 and 4 per cent. The Unconfined Compressive Strength (UCS) of the alkali-activated soil cured for 3, 7 and 28 days is determined and compared with the UCS of the soil replaced with fly ash and GGBS at both standard and modified proctor densities. The different mixes are tested for the durability, California Bearing Ratio (CBR). The soil is replaced with GGBS and fly ash does not pass the durability test while the alkali-activated mixes with 4% sodium oxide dosage is found to be durable. © 2018, © 2018 Informa UK Limited, trading as Taylor & Francis Group.
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    Utilization of lateritic soil stabilized with alkali solution and ground granulated blast furnace slag as a base course in flexible pavement construction
    (Springer, 2020) Amulya, A.; Ravi Shankar, A.U.; Singh, A.; Pammar, K.H.
    The natural aggregates are depleting in developing countries due to the excessive usage in road and building construction. In the present study, the engineering properties of abundantly available lateritic soil stabilized with Ground Granulated Blast Furnace Slag (GGBS) and alkali solutions like Sodium hydroxide and Sodium silicate was evaluated. The suitability of stabilized soil as a base course in flexible pavements was investigated. The lateritic soil was treated with 15, 20, 25 and 30% of GGBS and alkali solutions consisting of 5% of Sodium oxide with Silica Modulus (Ms) of 0.5, 1.0 and 1.5 at a constant water binder ratio of 0.25. The improved unconfined compressive strength, flexural strength, and fatigue life were observed from the soil treated with 30% of GGBS and alkali solution having Ms 1.0 air-cured for 28 days at ambient temperature. The improvement is due to the formation of Calcium Silicate Hydrates and Calcium Alumino Silicate Hydrates from an exothermic reaction between Calcium ions and the dissolved silicates and aluminates present in GGBS and alkali solutions. The samples treated with 25, 30% of GGBS and alkali solution having 1.0 Ms cured for 28 days found to be durable in Wetting-Drying and Freezing-Thawing tests. The compact and densified crystal orientation of the treated soil samples was observed from the microstructure images obtained from the Scanning Electron Microscope technique. The design of low and high volume roads was suggested with stabilized soil and strains developed at different locations on the proposed pavement were analyzed using pavement analysis software. © 2020, Chinese Society of Pavement Engineering. Production and hosting by Springer Nature.