ABSTRACT

Cracks in rigid pavements are a frequent and critical problem, which needs to be assessed to avoid deterioration and provide comfort and security. Control of damage requires the evaluation of cracks width and depth. Several laboratory tests were used in order to determine the ability of Ground Penetrating Radar (GPR) in the evaluation of damage under different controlled conditions. Those tests were focused in the analysis of different crack dimensions, changing the material inside the fractures and the orientation of the antenna with respect the crack axis. Results showed that the crack width increases hyperbolae amplitude, being the thinnest crack detected with a 2.3 GHz antenna, 2 mm thick. GPR B-scans were compared to images from computational models. Additionally, a field survey provided images according to the lab tests.

摘要

刚性路面的裂缝是一个常见且严重的问题，需要对其进行评估以避免恶化并提供舒适性和安全性。控制损伤需要评估裂缝的宽度和深度。为了确定探地雷达 (GPR) 在不同受控条件下评估损坏的能力，我们使用了几项实验室测试。这些测试的重点是分析不同的裂缝尺寸，改变裂缝内的材料以及天线相对于裂缝轴的方向。结果表明，裂纹宽度增加了双曲线振幅，是使用 2.3 GHz 天线检测到的最薄裂纹，厚度为 2 mm。将 GPR B 扫描与来自计算模型的图像进行比较。此外，现场调查提供了根据实验室测试的图像。