Conference Papers

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    Experimental and numerical studies on compressive behaviour of CFRP wrapped cylindrical concrete specimens subjected to different pre-loading conditions
    (Elsevier Ltd, 2020) Sathwik, M.C.; Prashanth, M.H.; Naik, S.C.; Satish, A.
    Numerous concrete structures have reached the end of their service life, either due to deterioration of the concrete caused by environmental factors or due to being functionally obsolete. Most of them are in serious need for restoration, retrofitting and rehabilitation. Carbon fibre reinforced polymer sheets are well suited for this because of their high strength to weight ratio, good fatigue properties and excellent resistance to corrosion. Their application has been rapidly growing in the civil engineering field and is becoming a promising solution for strengthening the deteriorated structures. Since CFRPs are easy to apply, they minimize labour costs and leads to significant savings in the overall costs of the project. In the present study, concrete specimens were damaged to a different extent by subjecting it to uniaxial compression followed by wrapping with CFRP sheets. Then, the effects of CFRP wrapping on the strength of pre-damaged concrete specimens are studied experimentally. Thereby the behaviour of normal concrete and CFRP wrapped concrete specimens are studied. The experimental results obtained are compared with the numerical results obtained using ABAQUS software. © 2019 Elsevier Ltd. All rights reserved.
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    Constructive scope on implementation of copper slag as replacement for natural fine aggregate—an overview
    (Springer Science and Business Media Deutschland GmbH, 2021) Thilak Kumar, Y.T.; Arpitha, D.; Sudarshan, V.J.; C, C.; Puttaswamy, N.
    This paper communicates organized work on copper slag drawn from scientific literature which comprises evaluation of physical and chemical characteristics, mechanical and durability properties in the marine environment. Analysis of test data derived from previously available sources reveals that copper slag having similar basic characteristics is an acceptable alternative material to river sand to produce concrete of all grades. The lesser water absorption property of copper slag is very significant peculiarity which attributes to develop high strength in concrete. The behaviour of concrete produced using copper slag to the concrete made corresponding to sand component shows identical behaviour in the fresh and hardened states. As an aggregate, copper slag has an ability to be replaced with fine aggregate, thereby the advance progress in the concrete technology will revolutionize the mixture of different conventional ingredients to uplift the expected properties of concrete to renew its definition. Hence, alternative materials to be used as fine aggregate will reduce the burden on the environment which is being extensively investigated all over the world looking to the significant requirements, quality and properties which have been a global consensus on the materials. © Springer Nature Singapore Pte Ltd 2021.
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    Application of Proper Orthogonal Decomposition in Concrete Performance Appraisal
    (Springer Science and Business Media Deutschland GmbH, 2021) Manoj, A.; Babu Narayan, K.S.B.
    Mould ability of concrete has made it the most versatile and popular material of construction. Workability, strength and durability of concrete are very important characteristics that depend on a large number of variables like cement and aggregate type, mix proportioning, method of mixing, conveying, placing and curing and environmental conditions of exposure like temperature, humidity, wind velocity and insolation. The degrees to which workability, strength and durability characteristics vary, and also interplay and conflicts make decision on consideration of independent variables that influence concrete performance, make the job of analysts very complex. Proper Orthogonal Decomposition (POD) is a tool that has great usage potential in reorganizing and rationalizing vast data to understand dependence, interdependence and independence of variables that affect the concrete characteristics. This paper presents the utility of Proper Orthogonal Decomposition in concrete performance appraisal. © 2021, Springer Nature Singapore Pte Ltd.
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    Effect of Heating and Fluid Saturation on Certain Physico-Mechanical and Fracturing Behaviour of Concrete
    (Springer Science and Business Media Deutschland GmbH, 2024) Gafur, I.A.; Anilkumar, A.; Parappalli, A.N.; Srinivasan, V.
    Understanding the fracturing characteristics of construction materials under varying environmental conditions is very important in considering the safety of infrastructural facilities for sustainable civil structures. Concrete has been extensively used in construction, and with recent advancements in offshore structures, its strength in adverse conditions is pivotal and hence requires significant attention. This study investigates the variation in the mechanical properties and fracturing behaviour of M25 concrete cubes under different environmental conditions. The cubes were subjected to five different conditions: heating, saturation, and a combination of heating and saturation. Saturation was carried out separately using water and brine solutions. Three cubes were cast for each condition. The physical properties included density and Ultrasonic pulse velocity, followed by mechanical testing for strength. Acoustic emission monitoring was carried out simultaneously along the mechanical testing. Acoustic emission techniques are used to visualize fracturing behaviour of concrete cubes. Fracture thresholds are established to find crack closure and elastic region, and regions of stable crack propagation and unstable crack propagation. The results show that the combination of heating and fluid saturation significantly impacts the physico-mechanical properties of concrete, reducing its compressive strength and increasing its susceptibility to fracture. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.