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Evaluation of freeze-thaw damage in concrete by ultrasonic imaging

机译:超声成像评估混凝土的冻融损伤

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摘要

This work studies the use of ultrasonic imaging as an evaluation tool in concrete subjected to freeze-thaw (F-T) cycles. To evaluate the damage in this deterioration process, ultrasonic velocity and attenuation images have been generated from concrete specimens with and without air-entraining agents. Two parameters have been proposed from these ultrasonic images according to our experimental setup: the non-assessable area proportion (NAAP) and a weighted average velocity in terms of the NAAP. The proposed parameters have been compared with the recommended failure criteria of the ASTM and Rilem standards, which employ ultrasonic contact measurements. The principal advantage of the use of ultrasonic images and the proposed methodology in comparison with the ultrasonic velocity measurements by contact is the possibility of detection of incipient damage caused by accelerated freeze-thaw cycles.
机译:这项工作研究了超声成像在经受冻融(F-T)循环的混凝土中作为评估工具的用途。为了评估在这种恶化过程中的破坏,已经从有和没有空气夹带剂的混凝土样品中产生了超声波速度和衰减图像。根据我们的实验设置,已经从这些超声图像中提出了两个参数:不可评估的面积比例(NAAP)和以NAAP表示的加权平均速度。建议的参数已与采用超声波接触测量的ASTM和Rilem标准的推荐失效标准进行了比较。与通过接触进行超声速度测量相比,使用超声图像和提出的方法的主要优点是可以检测到由加速的冻融循环引起的初期损坏。

著录项

  • 来源
    《NDT & E international》 |2012年第2012期|p.86-94|共9页
  • 作者单位

    Centro de Acustica Aplicada y Evaluation No Destructiva, CAEND, (CSIC-UPM), Arganda del Rey, 28500 Madrid. Spain;

    Centro de Acustica Aplicada y Evaluation No Destructiva, CAEND, (CSIC-UPM), Arganda del Rey, 28500 Madrid. Spain;

    Departamento de Ingenieria Civil y Construction, ETSICCP, UPM, 28040 Madrid, Spain;

    Departamento de Vehiculos Aeroespaciales, EUIT Aeronauticos UPM, 28040 Madrid, Spain;

    Centro de Acustica Aplicada y Evaluation No Destructiva, CAEND, (CSIC-UPM), Arganda del Rey, 28500 Madrid. Spain;

    Centro de Acustica Aplicada y Evaluation No Destructiva, CAEND, (CSIC-UPM), Arganda del Rey, 28500 Madrid. Spain;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    ultrasonic imaging; velocity; attenuation; concrete; freeze-thaw damage;

    机译:超声波成像速度;衰减;具体;冻融损伤;

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