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首页> 外文会议>NDE/NDT for Highways and Bridges >Nondestructive Inspection of Strand Corrosion in Prestressed Concrete Box Beam Members
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Nondestructive Inspection of Strand Corrosion in Prestressed Concrete Box Beam Members

机译：预应力混凝土盒梁构件中钢绞线腐蚀的无损检测

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Catastrophic failures of non-composite prestressed precast concrete adjacent-box beam bridges have occurred in several states due to corrosion of the prestressing steel. These failures have highlighted the need to improve methods used to detect corrosion damage and subsequently load rate the damaged members. In light of this, PennDOT initiated a research program at Lehigh University aimed at improving inspection techniques through evaluation of off-the-shelf nondestructive testing (NDT) technologies and correlation of surface conditions with non-visible strand corrosion. The project compared visual inspection requirements and NDT methods with actual in-situ damage present in a group of 40-50 year old box beams removed from service. The goal of this project was to determine if visual inspection techniques or currently available NDT technologies will allow for accurate identification of non-visible corrosion of prestressing strands. The research program revealed that half-cell potential, ground penetrating radar, line scanning thermography, ultrasonic impact echo, and ultrasonic shear wave testing provide limited accuracy in identifying non-visible strand corrosion. Remnant magnetism and magnetic flux leakage were found to provide accurate and reliable predictions of strand corrosion in prestressed concrete box beams.
机译：由于预应力钢的腐蚀，在几种状态下发生了非复合预应力预制混凝土相邻箱梁桥的灾难性故障。这些故障突出了改善用于检测腐蚀损坏的方法的需要，并随后将损坏的成员加载率。鉴于此，Penndot在Lehigh大学启动了一项研究计划，旨在通过评估现成的非破坏性测试（NDT）技术和表面条件与不可见的链腐蚀的相关性的相关性改善检查技术。该项目比较了目前检验要求和NDT方法，具有实际的原位损坏，在一组40-50岁的箱梁中取出的服务。该项目的目标是确定目视检查技术是否或当前可用的NDT技术将允许准确识别预应力股的不可见腐蚀。研究计划透露，半电池电位，地面穿透雷达，线扫描热成像，超声波冲击回波和超声剪切波检测在识别不可见的链腐蚀时提供有限的精度。发现残余磁力和磁通量泄漏在预应力混凝土箱梁中提供了对股线腐蚀的准确可靠的预测。

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