Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Thermal Remote Sensing in Early Age Concrete Strength Estimation
Abstract The construction industry is the most prominent sector which needs continuous evaluation and monitoring for structural stability and reliability. Monitoring the concrete at early ages can reduce structural failures which may result in fatal accidents. Maturity method is one such NDT method, particularly used for predicting the early age strength by heat generated from concrete. The temperature generated from the heat of hydration is considered as a key parameter in evaluating the maturity method. Conventionally, the maturity method is evaluated by installing temperature sensors inside the concrete and plotting the temperature graphs. NDT, in conjunction with remote sensing thermal imaging sensors, is a motivating alternative for strength estimation in early stages of construction. This study is aimed to replace the thermocouples with well-calibrated thermal infrared imaging sensor. Two different mix proportions, i.e., M20 and M40 are adopted for conducting the study. This study is conducted under a controlled environment without interacting with the external climatic temperature by placing the concrete cubes in thermocol box. Thermal images are obtained in specific time intervals like 15, 30, 60, and 90 min. Concrete cubes are tested for compressive strength simultaneously at the age of 3, 5, and 7 days developing calibration curve. Thermal images of concrete specimens are processed in FLIR SMART VIEW software for recording the surface temperature variations. Time-temperature graphs are plotted from the observed surface temperatures for calculating the maturity indices of concrete. From the developed graphs it is observed that drastic change in surface temperatures has occurred only in the first 24 h of the casting. Nurse-Saul calibration curve is generated by the observed temperatures and compressive strengths of concrete specimens. This calibration curve can be used for concrete specimens under controlled climatic conditions. The hybridization of thermography, photogrammetric, and computer vision techniques like image analysis serves in interpreting the early age strength gain of concrete.
Thermal Remote Sensing in Early Age Concrete Strength Estimation
Abstract The construction industry is the most prominent sector which needs continuous evaluation and monitoring for structural stability and reliability. Monitoring the concrete at early ages can reduce structural failures which may result in fatal accidents. Maturity method is one such NDT method, particularly used for predicting the early age strength by heat generated from concrete. The temperature generated from the heat of hydration is considered as a key parameter in evaluating the maturity method. Conventionally, the maturity method is evaluated by installing temperature sensors inside the concrete and plotting the temperature graphs. NDT, in conjunction with remote sensing thermal imaging sensors, is a motivating alternative for strength estimation in early stages of construction. This study is aimed to replace the thermocouples with well-calibrated thermal infrared imaging sensor. Two different mix proportions, i.e., M20 and M40 are adopted for conducting the study. This study is conducted under a controlled environment without interacting with the external climatic temperature by placing the concrete cubes in thermocol box. Thermal images are obtained in specific time intervals like 15, 30, 60, and 90 min. Concrete cubes are tested for compressive strength simultaneously at the age of 3, 5, and 7 days developing calibration curve. Thermal images of concrete specimens are processed in FLIR SMART VIEW software for recording the surface temperature variations. Time-temperature graphs are plotted from the observed surface temperatures for calculating the maturity indices of concrete. From the developed graphs it is observed that drastic change in surface temperatures has occurred only in the first 24 h of the casting. Nurse-Saul calibration curve is generated by the observed temperatures and compressive strengths of concrete specimens. This calibration curve can be used for concrete specimens under controlled climatic conditions. The hybridization of thermography, photogrammetric, and computer vision techniques like image analysis serves in interpreting the early age strength gain of concrete.
Thermal Remote Sensing in Early Age Concrete Strength Estimation
Kumarapu, Kumar (Autor:in) / Shashi, M. (Autor:in) / Venkata Reddy, K. (Autor:in)
20.06.2019
12 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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