Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
2D and 3D imaging of concrete and fiber reinforced polymer composite wrapped cylindrical columns using ground penetrating radar
Nondestructive testing of cylindrical concrete columns is of great importance for mapping the subsurface geometry of steel reinforcing bars and detecting subsurface discontinuities that may be detrimental to structural integrity. In addition, when old concrete columns in buildings or bridges are rehabilitated by wrapping the columns with fiber reinforced polymer (FRP) composite fabrics to enhance their strength and ductility, it is important to detect the presence of subsurface debonds between the FRP fabric and the underlying concrete column during the initial rehabilitation stage as well as during service. Timely detection of debonds can lead to remedial action such as injecting resin into the debonds, so that the confinement action provided by the FRP fabric wrap is not adversely affected. While past studies using ground penetrating radar (GPR) have demonstrated the ability to detect subsurface debonds and reinforcing bars, the data is typically presented as 2D cross-sectional scans, and the 3D imaging technique is limited to flat objects such as bridge decks. This paper discusses the use of 3D GPR imaging for cylindrical concrete columns with or without FRP wraps and compares the effectiveness of 2D and 3D GPR images for displaying subsurface features such as debonds and metallic rebars in cylindrical columns. As shown from the results in this paper, the 3D cylindrical imaging technique greatly enhances the visualization of GPR data for concrete cylindrical columns. This paper also presents the cross-sectional GPR scans for a cylindrical column in polar coordinates.
2D and 3D imaging of concrete and fiber reinforced polymer composite wrapped cylindrical columns using ground penetrating radar
Nondestructive testing of cylindrical concrete columns is of great importance for mapping the subsurface geometry of steel reinforcing bars and detecting subsurface discontinuities that may be detrimental to structural integrity. In addition, when old concrete columns in buildings or bridges are rehabilitated by wrapping the columns with fiber reinforced polymer (FRP) composite fabrics to enhance their strength and ductility, it is important to detect the presence of subsurface debonds between the FRP fabric and the underlying concrete column during the initial rehabilitation stage as well as during service. Timely detection of debonds can lead to remedial action such as injecting resin into the debonds, so that the confinement action provided by the FRP fabric wrap is not adversely affected. While past studies using ground penetrating radar (GPR) have demonstrated the ability to detect subsurface debonds and reinforcing bars, the data is typically presented as 2D cross-sectional scans, and the 3D imaging technique is limited to flat objects such as bridge decks. This paper discusses the use of 3D GPR imaging for cylindrical concrete columns with or without FRP wraps and compares the effectiveness of 2D and 3D GPR images for displaying subsurface features such as debonds and metallic rebars in cylindrical columns. As shown from the results in this paper, the 3D cylindrical imaging technique greatly enhances the visualization of GPR data for concrete cylindrical columns. This paper also presents the cross-sectional GPR scans for a cylindrical column in polar coordinates.
2D and 3D imaging of concrete and fiber reinforced polymer composite wrapped cylindrical columns using ground penetrating radar
2D- und 3D-Bildgebung von Beton und einer mit faservertärktem Polymer-Verbundwerkstoff ummantelte zylindrische Säule mittels eindringender Radartechnik
Pyakurel, Sandeep (Autor:in) / Halabe, Udaya B. (Autor:in)
ME - Materials Evaluation ; 71 ; 73-82
2013
10 Seiten, 9 Bilder, 15 Quellen
Aufsatz (Zeitschrift)
Englisch
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