Use of ultrasonic tomography for the assessment of critical aspects of doweled joints in concrete pavements

Eric Ribeiro da Silva, J. Balbo, Andréia Posser Cargnin
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引用次数: 0

Abstract

The critical (design) parameters to be controlled for concrete pavements construction, in addition to the concrete strength, are slab`s thicknesses and doweled bars position at contraction joints, as they affect hugely structural performance, and, if not properly built may cause early ruptures. Construction compliance of such parameters is nowadays assessed through nondestructive techniques (NDT), such as ultrasonic low-frequency waves. Alignments of inserted doweled bars at contraction joints are analyzed herein for actual slabs as well as how thickness affects such position. Tests were carried out over an airport hangar apron after it has been built. Twenty-five concrete slabs were assessed using ultrasonic tomography allowing to verify disconformities of thicknesses and bars vertical and horizontal misalignments, with fair accuracy on measuring deviation angles of bars.
使用超声层析成像技术评估混凝土路面中榫缝的关键方面
除了混凝土强度外,混凝土路面施工需要控制的关键(设计)参数还有板的厚度和收缩缝处的榫钉位置,因为它们会极大地影响结构性能,如果建造不当,可能会导致早期破裂。如今,通过超声波低频波等无损检测技术来评估这些参数的施工符合性。本文分析了实际板在收缩缝处插入的榫钉钢筋的对齐情况,以及厚度如何影响这种位置。测试是在机场机库停机坪建成后进行的。使用超声波断层扫描对25块混凝土板进行了评估,从而能够验证厚度的不一致性以及钢筋的垂直和水平错位,在测量钢筋的偏转角方面具有相当的准确性。
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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