CAREER: Rapid non-destructive assessment of concrete structures using elastic waves

该方案提供了一种快速、准确的无损评估(NDE)方法来评估混凝土结构的现场状态。敏感和实用的无损检测技术对管理基础设施的机构具有重要价值。然而，执行目前的无损检测和分析结果所需的时间和精力限制了广泛的应用。这项提议旨在开发一种快速和稳健的方法来收集混凝土结构的弹性波数据，并开发一种成像结构的方法，以表征受损区域的位置、类型和大小。提议的方法利用了若干创新，包括：(A)使用表面导波，(B)敏感的非接触波接收技术，如空气耦合换能器和激光干涉测量，(C)单边、点源、点接收器无损检测测量，如面波传输和速度扫描，以及(D)利用开发的测量数据的成像方法。教育计划与拟议的研究紧密结合在一起。该教育计划的目的是在德雷塞尔大学设计一门本科生和研究生工程课程，以满足当前基础设施行业的需求。该计划还包括额外的教育推广，以鼓励市中心的学生从事工程职业。

This proposal offers an approach for rapid and accurate non-destructive evaluation (NDE) to assess the in-place condition of concrete structures. Sensitive and practical NDE techniques are of great value to agencies that govern the infrastructure. However, the time and effort required to perform current NDE tests and to analyze the results limit widespread application. This proposal aims to develop a rapid and robust method to collect elastic wave data from a concrete structure and an approach for imaging structures that characterizes the location, type and magnitude of damaged areas. The proposed approach makes use of several innovations including (a) use of surface-guided waves, (b) sensitive, non-contact wave reception techniques such as air-coupled transducers and laser interferometry, (c) one-sided, point source, point receiver NDE measurements such as surface wave transmission and velocity scans, and (d) an imaging approach that makes use of the developed measurement data. An educational plan is closely integrated with the proposed research. The intent of the educational plan is to design an undergraduate and graduate engineering curriculum at Drexel University that responds to current needs of the infrastructure industry. The plan also includes additional educational outreach to encourage inner-city students to pursue a career in engineering.