Conference Papers

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Author: search.filters.author.Ravi Shankar, A.U.R.Has files: No

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    Dynamic behavior of Black Cotton soil stabilized with Enzyme
    (Advanced Engineering Solutions, 2013) Mithanthaya, I.R.; Ravi Shankar, A.U.R.; Bhavanishankar R, N.
    The Black Cotton (BC) soil is abundantly available in North Karnataka (India).To improve its properties the soil has to be stabilized either mechanically or chemically to improve the geotechnical properties of such type of soils. Enzyme soil stabilization is one of the methods of soil stabilization. Various experimental investigations have shown that there is much improvement in Atterberg limits, CBR and UCS strength when stabilized with Enzyme .In recent past many Enzymes have come to the market which can be used as Stabilizing agent. One such stabilizing agent (Product "A")is used in the present investigation to improve the soil properties for using it as sub base material in the pavement. The effect of enzyme on black cotton soil in terms of Unconfined Compressive Strength (UCS), California Bearing Ratio (CBR), Compaction and permeability have been studied. It has been observed that the enzyme treated soil showed significant improvement in terms of UCS, CBR with longer curing period. Since the CBR test results show that the increase in CBR value is more than 100%, fatigue behavior of enzyme stabilized soil also has been studied to find stress variation for repeated load condition. The experimental investigation shows much improvement in its fatigue behavior for BC soil .Suitability of this stabilized soil as sub base material for the flexible pavement design has been investigated. © Advanced Engineering Solutions (AES.COM) Ottawa, Canada. All rights are reserved.
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    Stone matrix asphalt using aggregates modified with waste plastics
    (American Society of Civil Engineers (ASCE) onlinejls@asce.org, 2014) Goutham, G.; Lekha, B.M.; Ravi Shankar, A.U.R.
    Stone matrix asphalt (SMA) is a gap-graded asphalt mixture performing better than conventional dense-graded mixtures. It contains a high concentration of coarse aggregates (forming stone-on-stone contact between them) and high asphalt content. The coarse aggregate skeleton results in better load distribution and the high asphalt content adds durability to the mixture. Due to the high mastic (filler and asphalt) content, there is possibility of drain down during various stages in construction. SMA mix should be prepared with a suitable stabilizing additive to prevent the drain down of mastic material from the mixture. In this study, SMA mixtures are prepared in a Super pave Gyratory Compactor (SGC) with shredded waste plastics, which are mixed with aggregates prior to the addition of Viscosity Graded (VG) - 30 asphalt. Mixtures are prepared with asphalt contents of 5.0 to 7.0 per cent (by weight of aggregates) and stabilizer contents of 0, 4, 8, 12 and 16 per cent (by weight of asphalt). Volumetric and Marshall properties, tensile strength, and moisture susceptibility characteristics are determined. From the laboratory studies, it is observed that addition of waste plastics in shredded form can be used instead of stabilizers by controlling the drain down and enhancing the performance. © 2014 American Society of Civil Engineers.
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    Experimental Studies on Lateritic Soil Stabilized with Cement, Coir and Aggregate
    (Springer Science and Business Media Deutschland GmbH info@springer-sbm.com, 2021) Ravi Shankar, A.U.R.; Priyanka, B.A.; Avinash
    The characteristics of subgrade soil play a vital role in designing the pavement structure so that the pavement has required support from the bottom layer. During adverse weather conditions and higher traffic loads moving on any pavement, it should be able to withstand the impact and perform well for longer duration. Load is transmitted from pavement to the subgrade layer and distributed evenly through the soil particles. All types of soil are not capable of handling such impacts by their own and needs additional stabilization processes. Several stabilization processes are available in which the best one has to be taken into consideration. Fibers such as coconut coir are important in giving extra stability to the soil particles. Cement is well-known material in construction sector along with aggregates. Lateritic soil is available abundantly in coastal areas of southern parts of India which has porous structure and demands stabilization when the intended purpose is specific and requires higher strength and durability. In this study, coconut coir along with cement and aggregate are taken as stabilization materials to stabilize lateritic soil. Initially, basic properties of soil like plastic limit, liquid limit and plasticity index are determined. Grain size analysis is done and modified Proctor test is conducted to determine the optimum moisture content (OMC) and maximum dry density (MDD) of the soil. Unconfined compression test (UCS), California bearing ratio test (CBR), flexural fatigue analysis, durability properties with respect to wet-dry cycles and freeze–thaw cycles are evaluated for untreated and treated soil specimen. As per UCS values, cement can be taken at an optimum dosage of 6%. The coir fibers from natural husk of coconut and aggregates of 10 mm below size were added to the soil–cement mixes and an optimum dosage of coir and aggregate is determined. The study showed positive results in terms of CBR values of cement-aggregate treated soil. © 2021, Springer Nature Singapore Pte Ltd.
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    Experimental Investigations on RBI Grade 81 Stabilized Lateritic Soil
    (Springer Science and Business Media Deutschland GmbH, 2021) Chethan, B.A.; Das, S.; Amulya, S.; Ravi Shankar, A.U.R.
    The effectiveness of the addition of RBI Grade 81 (stabilizer) (dosages of 2, 4, 6, and 8%) to stabilize the largely encountered lateritic soil during construction was investigated. Stabilized lateritic soil mixes were evaluated by conducting a series of experiments, viz., standard and modified compaction, unconfined compressive strength, and California bearing ratio at various curing periods. Mixes under both standard and modified compaction energies have shown the highest density at a 6% stabilizer dosage. A remarkable increase in unconfined compressive strength was observed for the specimens prepared at a 6% stabilizer dosage corresponding to the modified compaction density. An increase in the percentage of stabilizer has increased the California bearing ratio of treated mixes. Exorbitant increase in the soaked California bearing ratio values of the stabilized mixes was observed for higher dosages (6 and 8%). Hence, RBI Grade 81 amended lateritic soil mixes enhance the strength of the subgrade. © 2021, Springer Nature Singapore Pte Ltd.