Faculty Publications
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Item Mechanical properties of pavement quality concrete produced with reclaimed asphalt pavement aggregates(Springer, 2019) Panditharadhya, B.J.; Mulangi, R.H.; Ravi Shankar, A.U.; Kumar, S.Production of conventional coarse aggregates for concrete works is getting difficult because of depleting natural resources and environmental ill effects. Reclaimed Asphalt Pavement (RAP) aggregates, which are produced from asphalt waste generated during removal of flexible pavement. The disposal problems of asphalt waste generated is also addressed with this step. The properties of RAP aggregates may vary with the source of waste generation and the age of the asphalt. This study is taken up to determine the strength characteristics of pavement quality concrete produced with RAP aggregates produced with asphalt waste generated at local road construction site. Properties such as compression strength, elastic modulus, flexural strength, split tensile strength, and water absorption were determined for the specimen with varying percentage of RAP replacement. The asphalt waste was processed further with screening to obtain the required gradation. RAP aggregates were replaced with conventional aggregates by 20, 40, 60, 80, and 100%. Mix with 60% conventional granite aggregates and 40% RAP aggregates was found to satisfy the requirements of M30 grade concrete that can be used for producing concrete for constructing the roads with lower traffic volume. © Springer Nature Singapore Pte Ltd. 2019.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.