Simulation of a Defect in a Concrete Dam Structure Using Steady-State Infrared Thermography
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RESEARCH PAPER
Simulation of a Defect in a Concrete Dam Structure Using Steady‑State Infrared Thermography Abdelhamid Noufid1 · Sougrati Belattar2 Received: 6 March 2017 / Accepted: 26 October 2020 © Shiraz University 2020
Abstract A roller compacted concrete (RCC) dam is a large civil engineering structure that is subject to a permanent load of water hydrostatic thrust, and the construction of such a structure requires enormous human, material and financial resources. It gives rise to a reserve of water upstream in billions of m 3; therefore, a problem in its stability will generate a catastrophe at its end. Among the means of controlling the dam body is the detection of abnormalities by infrared thermography. In this communication, we will simulate a structure of a dam containing a defect, and the discontinuity of the concrete gives rise to a contrast in the thermo-gram of the downstream surface. Thus several parameters will be studied in this dam, namely the positioning of the defect with respect to the downstream surface, the thickness of this defect and finally the orientation. The thermal images of the downstream surface are recovered in order to interpret the contrast and to draw explanations of what is inside this dam. Keywords Concrete · Modeling · Infrared thermography · Contrast · Simulation
1 Introduction Infrared thermography allows to get a surface temperature map of any object, of even complex geometry, in a remote and noninvasive way starting from the thermal energy radiated by such an object in the infrared electromagnetic band of the used detector (Meola et al. 2017). It is a thermal method of non-destructive testing which can contribute to the integrity evaluation of the civil engineering structures, especially when the question is to detect the defects close to surface. Its principle is based on the analysis of the thermal images captured on a surface of the suspect structure (Belattar et al. 2012). Typical defects that can be detected by NDT include delaminations, disbonds, voids, foreign material inclusions, trapped water, variations in thickness and other geometric details, and variations in thermal or physical properties (Vladimir and Douglas, 2015). The aim of this presentation is to apply the method of non-destructive * Abdelhamid Noufid [email protected] 1
Department of Civil Engineering, National School of Applied Sciences (ENSA), Agadir, Morocco
Department of Physics, Faculty of Science Semlalia, Moulay Abdellah Street, Marrakech, Morocco
2
thermal control (NDC) on a civil engineering structure, namely a concrete weight barrier. It is a question of testing the capacities of this method for the detection of compaction defects, also aiming at studying the influence of different parameters such as the thickness, the position and the orientation of the voids on the temperature distribution (Elballouti and Belattar 2008). One can take on the surface downstream of the structure; such an anomaly is manifested on the thermo-gram by the appearance of a contrast of t
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