利用自动化声波扫描系统和探地雷达对混凝土桥面进行无损评估。

Nondestructive Evaluation of Concrete Bridge Decks with Automated Acoustic Scanning System and Ground Penetrating Radar.

机构信息

Department of Civil Engineering, University of Nebraska-Lincoln, 1110 S 67th St., Omaha, NE 68182, USA.

出版信息

Sensors (Basel). 2018 Jun 16;18(6):1955. doi: 10.3390/s18061955.

DOI:10.3390/s18061955

PMID:29914148

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6022118/

Abstract

Delamanintions and reinforcement corrosion are two common problems in concrete bridge decks. No single nondestructive testing method (NDT) is able to provide comprehensive characterization of these defects. In this work, two NDT methods, acoustic scanning and Ground Penetrating Radar (GPR), were used to image a straight concrete bridge deck and a curved intersection ramp bridge. An acoustic scanning system has been developed for rapid delamination mapping. The system consists of metal-ball excitation sources, air-coupled sensors, and a GPS positioning system. The acoustic scanning results are presented as a two-dimensional image that is based on the energy map in the frequency range of 0.5⁻5 kHz. The GPR scanning results are expressed as the GPR signal attenuation map to characterize concrete deterioration and reinforcement corrosion. Signal processing algorithms for both methods are discussed. Delamination maps from the acoustic scanning are compared with deterioration maps from the GPR scanning on both bridges. The results demonstrate that combining the acoustic and GPR scanning results will provide a complementary and comprehensive evaluation of concrete bridge decks.

摘要

破损和钢筋腐蚀是混凝土桥面的两个常见问题。没有单一的无损检测方法 (NDT) 能够全面描述这些缺陷。在这项工作中，使用了两种 NDT 方法，声扫描和探地雷达 (GPR)，来对一个直的混凝土桥面和一个弯曲的交叉口匝道桥进行成像。已经开发了一种声扫描系统来快速绘制分层图。该系统由金属球激励源、空气耦合传感器和 GPS 定位系统组成。声扫描结果以二维图像的形式呈现，该图像基于 0.5⁻5 kHz 频率范围内的能量图。GPR 扫描结果表示为 GPR 信号衰减图，以表征混凝土劣化和钢筋腐蚀。讨论了这两种方法的信号处理算法。对这两座桥上的声扫描分层图和 GPR 扫描劣化图进行了比较。结果表明，将声扫描和 GPR 扫描结果相结合，将对混凝土桥面进行补充和全面的评估。