Rebar detection: Comparison of stepped frequency continuous wave and pulsed GPR

Procedia Structural Integrity Pub Date : 2024-01-01 DOI:10.1016/j.prostr.2024.09.250

Mercedes Solla , Alexandre Novo , Ahmed Elseicy , F. Javier Prego

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引用次数: 0

Abstract

Reinforced concrete structures are widely used in civil engineering owing to their versatility, strength, and durability. One of the most recommended methods for rebar mapping is Ground-Penetrating Radar (GPR) because of its non-destructive and non-invasive character. In concrete mapping, GPR is mainly used for locating subsurface objects (rebars, tendons, ducts), measuring concrete cover, mapping mesh configuration (spacing), and detecting bottom of slab. To achieve these, concrete scanning GPR practitioners often need very high-resolution images. This work presents a comparison in rebar mapping between two GPR systems with different modulation techniques: Stepped frequency continuous wave (SFCW) and pulsed radar. The SFCW system used has a frequency range of 400-6000 MHz, while the pulsed system used a ground-coupled central frequency antenna of 2.3 GHz. Measurements were conducted on laboratory specimens, with rebar diameters ranging from 8 to 32 mm. Three different specimens were used, with one for calibration and other two to analyze both the horizontal and vertical resolutions of the frequency antennas.

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钢筋探测：阶跃频率连续波和脉冲 GPR 的比较

钢筋混凝土结构因其多功能性、强度和耐久性而被广泛应用于土木工程中。地面穿透雷达 (GPR) 是钢筋测绘最推荐的方法之一，因为它具有非破坏性和非侵入性的特点。在混凝土测绘中，GPR 主要用于定位地下物体（钢筋、筋腱、导管）、测量混凝土覆盖层、测绘网格配置（间距）和探测板底。要实现这些功能，混凝土扫描 GPR 从业人员通常需要非常高分辨率的图像。这项工作对采用不同调制技术的两种 GPR 系统的钢筋测绘进行了比较：步进频率连续波 (SFCW) 和脉冲雷达。所使用的 SFCW 系统频率范围为 400-6000 MHz，而脉冲系统使用的是 2.3 GHz 的地面耦合中央频率天线。测量是在实验室试样上进行的，钢筋直径从 8 毫米到 32 毫米不等。使用了三个不同的试样，其中一个用于校准，另外两个用于分析频率天线的水平和垂直分辨率。

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

Procedia Structural Integrity

CiteScore

1.70

自引率

0.00%

发文量