Conference Papers

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Author: search.filters.author.Ravi Shankar, A.U.Subject: search.filters.subject.Mechanical properties

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    State-of-the-Art of Grouting in Semi-flexible Pavement: Materials and Design
    (Springer Science and Business Media Deutschland GmbH, 2023) Kumar, D.H.; Ravi Shankar, A.U.
    Semi-flexible Pavement (SFP) is a composite pavement that consists of an open-graded friction course (OGFC) or porous asphalt mixture (PAM) having an air void content of 20–35%, grouted with cement paste/mortar with a fluidity of 10–16 s. The OGFC or PAM provides flexibility, skid resistance, and the grouting provides rigidity, capacity to carry heavy traffic without rutting, together to achieve a joint-free, rut-resistant pavement. The interconnected voids in the asphalt mixture filled with grout will be the secondary skeleton and help in load transfer, being the stone-on-stone contact with the primary skeleton. The review of supplementary cementitious materials (SCM), the formulation of the materials to meet the grouting design requirements, and the parameters to measure the efficiency are necessary to provide a more durable and fatigue-resistant pavement. The first part of the study discusses the mechanical properties of the materials, the design and preparation of the grouting. The grouting parameters and the contribution of grouting to SFP’s performance are discussed in the later part. The review indicated that the marginal aggregates can also be used, and with the use of SCM, durability, and strength can be increased. Concerning the benefits of grouting in SFP, scope exists for further research to design and understand the grouting better, which helps SFP perform better. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
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    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.