Conference Papers
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Item Experimental Investigation of Black Cotton Soil Stabilized with Lime and Coconut Coir(Springer, 2018) Ravi Shankar, A.U.; Panditharadhya, B.J.; Karishekki, S.; Amulya, S.Expansive soil occurring above the water table undergo volume changes with change in moisture content. In expansive soils, increase in water table causes swelling–shrink behaviour which leads to cracks and differential settlement resulting in several damages to the pavements, canal beds and linings, foundations, buildings, etc. An attempt is made in this paper to study the effect of adding lime-coir fiber on geotechnical properties of black cotton soil. In the present study an effort is made to obtain the optimum dosage of lime for stabilization of black cotton soil abundantly available in Karnataka state of India. The study incorporates investigation of basic geotechnical properties like grain size distribution, specific gravity, consistency limits and engineering properties like Maximum Dry Density (MDD), Optimum Moisture Content (OMC), Unconfined Compressive Strength (UCS) and California Bearing Ratio (CBR). Swelling properties have been determined by conducting Free Swell Index (FSI) test. Durability of the soil is studied by conducting wet-dry cycle and freeze-thaw cycles (WD and FT tests). Fatigue test has been conducted to determine the fatigue life of treated and original soil. Further chemical analysis was conducted to determine the chemical composition of untreated and treated soil. The optimum dosage of lime obtained was 4%. The investigations were carried out to study the effect of addition of coir fibers which are obtained from local market to evaluate the extent of modification on MDD, OMC, UCS and CBR of the soil. Maximum improvement in UCS and CBR values are observed when 1% of coir are mixed with the soil. Soil stabilized with Lime-Coir fiber has shown better results when compared to soil stabilized with lime alone. It is concluded that the proportion of 1% coir fiber in a soil is the optimum percentage of materials having maximum soaked CBR value. Hence, this proportion may be economically used in road pavement and embankments. © Springer Nature Singapore Pte Ltd. 2018.Item Mechanical properties of pavement quality concrete with secondary aluminium dross as partial replacement for ordinary portland cement(Institute of Physics Publishing helen.craven@iop.org, 2018) Panditharadhya, B.J.; Sampath, V.; Mulangi, R.H.; Ravi Shankar, A.U.Innovative method of waste disposal can be through utilizing them in concrete production as a filler material or pozzolana. Aluminium dross is a by-product obtained from the aluminium re-smelting process. Aluminium waste is processed in rotary kilns to recover the metal and residual salt cake is sent to landfills. The present study investigates the utilization of secondary aluminium dross as a binder in producing the concrete. It is observed that the initial setting time of the cement paste increases and final setting time decreases with varying percentages of Aluminium dross replacement. This property makes it suitable for hot weather conditions. It was replaced in 5, 10, 15 and 20% of the weight of the cement and optimum dosage is found to be 15 %. The mechanical properties like Compression strength, split tensile strength, flexural strength and water absorption of the M40 grade concrete were determined. It is observed that up to 15% replacement of cement by secondary aluminium dross is giving better results comparable with the conventional concrete. Results show that the Aluminium dross can be replaced as supplementary cementitious material in concrete with no compromise in the mechanical properties of the concrete. © Published under licence by IOP Publishing Ltd.Item Durability Studies on the Lateritic Soil Stabilized with GGBS and Alkali Solutions(American Society of Civil Engineers (ASCE) onlinejls@asce.org 1801 Alexander Bell DriveGEO Reston VA 20191 Alabama, 2019) Amulya, S.; Ravi Shankar, A.U.; Panditharadhya, B.J.In order to use the locally available lateritic soil as a base course for pavement construction, the engineering properties of the soil need to be enhanced. Hence, the experimental investigation of the lateritic soil stabilized with the ground granulated blast furnace slag (GGBS) and combination of alkali solutions such as sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) has been conducted. The various parameters which affect the properties of the soil like binder (GGBS) content, sodium oxide (Na2O) dosage, silica modulus (Ms), and water to binder ratio (w/b) are considered. In the present investigation, the GGBS content of 25%, Na2O of 6%, Ms of 0.5, and w/b of 0.25 are chosen. The Atterberg's limits, standard and modified proctor compaction tests, unconfined compressive strength (UCS), and durability tests were conducted on the stabilized soil. The UCS of 28 days cured and stabilized samples at standard and modified proctor densities is showing 775% and 580% increase with respect to natural soil and 98% and 142% increase with respect to 0 days cured samples respectively. The chosen combination of soil mixture passes all 12 cycles of wetting and drying (WD) and freeze and thaw (FT) with weight loss of 5.2% and 1% at standard proctor density and 8% and 2.5% at modified proctor density respectively after 7 days of curing. © 2019 American Society of Civil Engineers.Item Performance of Concrete Mix with Secondary Aluminium Dross as a Partial Replacement for Portland Pozzolana Cement(American Society of Civil Engineers (ASCE) onlinejls@asce.org 1801 Alexander Bell DriveGEO Reston VA 20191 Alabama, 2019) Panditharadhya, B.J.; Mulangi, R.H.; Ravi Shankar, A.U.; Amulya, S.The safety to our ecosystem can be assured by making use of many industrial wastes in a sustainable manner. Recycling and reutilisation of industrial waste and by-products is of high importance in cement and concrete industry. In view of rapid infrastructure growth, there is an emerging need for development of cementitious materials or fillers either to replace cement or fine aggregate for stable growth. One of such industrial wastes is secondary aluminium dross. In this paper, an attempt has been made to study the mechanical properties of concrete incorporated with secondary aluminium dross. Portland pozzolana cement has been partially replaced by secondary aluminium dross in various proportions like 5, 10, 15, and 20% to study the mechanical properties such as compressive strength, split tensile strength, flexural strength, water absorption. It is observed that up to 15% replacement of cement by secondary aluminium dross is giving better results comparable with the conventional concrete. Also, the increase in initial setting time is observed with increase in percentage replacement of aluminium dross in the concrete which can make it preferable in case of hot weather conditions wherein the concreting for the roads has to be done in an open environment. From the overall study, it can be concluded that the concrete incorporated with secondary aluminium dross can be used for making pavement quality concrete that can sustain low traffic volume or it can be considered for rural roads. © 2019 American Society of Civil Engineers.Item Experimental Investigation on Fiber-Reinforced Concrete with Bagasse Ash as Binder(Springer Science and Business Media Deutschland GmbH, 2024) Panditharadhya, B.J.; Mulangi, R.H.; Ravi Shankar, A.U.Utilizing waste materials in concrete provides an environmental disposal option. Due to a rise in infrastructure development, the demand for concrete raw materials has increased rapidly. In the current study, bagasse fiber after sugarcane juice extraction, bagasse ash waste from the sugar industry, and coir fiber from coconut are considered as potential replacements to raw materials. Bagasse ash is substituted with variable percentages, i.e., 5, 10, 15, and 20% of Ordinary Portland Cement, while Sugarcane Bagasse fiber and Coir fiber are added at 0.5, 1.0, 1.5, and 2.0% of Ordinary Portland Cement. Cubes (150 mm *150 mm *150 mm), cylinders (300 mm height, 150 mm diameter), and prisms (500 mm *100 mm *100 mm) were prepared with M30 grade concrete. After curing for 7, 28, and 56 days, mechanical characteristics such as compressive strength, split tensile strength, and flexural strength were determined. Ultrasonic pulse velocity test was considered as a non-destructive testing approach to determine strength of concrete without destructing the specimens and compared with strength values obtained in destructive tests. Durability tests, i.e., acid attack, sorptivity, carbonation, and rapid chloride ion penetration tests were conducted for 90 days cured specimens. As per the experimental findings, adding 15% of Sugarcane bagasse ash and 1.5% of fibers increase the strength properties of concrete. With 15–20% bagasse ash and 1.5–2.0% fiber replacements showed better durability in comparison to conventional concrete. Therefore, bagasse ash, bagasse fiber and coir fibers prove to be sustainable alternative materials in environment-friendly concrete production. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.