Applicability of available NDT methods for damage detection in concrete elements reinforced or strengthened with FRP

IF 0.7 Q4 CONSTRUCTION & BUILDING TECHNOLOGY
P. Malla, S. S. Khedmatgozar Dolati, A. Mehrabi, J. Ortiz Polanco, A. Nanni, K. Dinh
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引用次数: 0

Abstract

The application of Fiber Reinforced Polymer (FRP) materials in concrete structures has been rising due to their several advantages, including lightweight, high tensile strength, ease of installation, and corrosion resistance. They have been mostly implemented for strengthening and repairing existing structures in the form of an externally bonded system, i.e., sheet, jacket, near surface mounted. Furthermore, they have been recently utilized as internal reinforcement of concrete elements in the form of strands, bars, tendons, etc. Although higher durability and performance are associated with the FRP material in some aspects compared to steel, concerns remain regarding damages and defects in this material, many of which are related to their unique features. Importantly, debonding of FRP materials from a concrete surface or within a concrete element has always been an issue resulting in the premature failure of the structure. To this end, concrete elements strengthened or reinforced with FRP materials has to be inspected periodically to detect potential issues and hence prevent any premature failures. This study first determines all possible or potential damages and anomalies attributed to FRP reinforced/strengthened concrete (FRP-RSC) elements. It then investigates Non-Destructive Testing (NDT) methods that can be applicable to the inspection of FRP-RSC elements from a literature survey of past studies, applications, and research projects. Furthermore, this study evaluates the ability of two of the most commonly used NDT methods, Ground Penetrating Radar (GPR) and Phased Array Ultrasonic (PAU), in detecting FRP bars/strands embedded in concrete elements. GPR and PAU tests were performed on two slab specimens reinforced with GFRP (Glass-FRP) bars, the most commonly used FRP bar, with variations in their depth, size and configuration, and a slab specimen with different types of available FRP reinforcements. The results of this study propose the most applicable methods for detecting FRP and their damage/defects in FRP-RSC elements. This study further investigates the feasibility of two new methods for improving the detectability of embedded FRP bars. By providing the inspection community with more clarity in the application of NDT to FRP, this study offers means for verifying the performance and, therefore, help the proliferation of FRP materials in concrete structures.
现有无损检测方法在检测用玻璃纤维增强材料加固或强化的混凝土构件的损伤方面的适用性
纤维增强聚合物(FRP)材料具有重量轻、抗拉强度高、易于安装和耐腐蚀等优点,因此在混凝土结构中的应用日益增多。玻璃纤维增强聚合物材料主要用于加固和修复现有结构,采用外部粘接系统的形式,如板材、护套、近表面安装等。此外,最近还以钢绞线、钢筋、钢筋等形式用作混凝土构件的内部加固。虽然与钢材相比,玻璃钢材料在某些方面具有更高的耐久性和性能,但这种材料的损坏和缺陷仍然令人担忧,其中许多都与其独特的特性有关。重要的是,玻璃钢材料与混凝土表面或混凝土构件内部的脱粘一直是一个问题,会导致结构过早失效。为此,必须定期检查使用玻璃钢材料加固或增强的混凝土构件,以发现潜在问题,从而防止任何过早失效。本研究首先确定了玻璃纤维增强/加固混凝土(FRP-RSC)构件所有可能或潜在的损坏和异常情况。然后,通过对以往研究、应用和研究项目的文献调查,研究可用于检测 FRP-RSC 构件的无损检测 (NDT) 方法。此外,本研究还评估了两种最常用的无损检测方法--地面穿透雷达(GPR)和相控阵超声波(PAU)--在检测嵌入混凝土构件中的玻璃钢条/带方面的能力。研究人员对两种板试样进行了 GPR 和 PAU 测试,一种是使用最常用的玻璃纤维增强塑料(FRP)钢筋(玻璃纤维增强塑料)进行加固的板试样,其深度、尺寸和配置各不相同;另一种是使用不同类型的玻璃纤维增强塑料进行加固的板试样。研究结果提出了检测 FRP-RSC 构件中 FRP 及其损坏/缺陷的最适用方法。本研究进一步探讨了两种新方法的可行性,以提高嵌入式 FRP 钢筋的可检测性。通过为检测界提供更清晰的玻璃钢无损检测应用,本研究提供了验证性能的方法,从而有助于玻璃钢材料在混凝土结构中的推广。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Bridge Structures
Bridge Structures CONSTRUCTION & BUILDING TECHNOLOGY-
CiteScore
1.10
自引率
0.00%
发文量
5
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