Measurement of As-Built Conditions Using Ground Penetrating Radar

摘要

This paper provides an overview of the state-of-the-art of GPR technology as applied to the measurement of as-built conditions, with specific application examples and supporting research study results. Knowledge of the as-built conditions is an essential part of any non-destructive evaluation program. Existing records and drawings often do not represent what actually took place during construction, nor do they represent changes and repairs that have taken place after initial construction. Ground penetrating radar is a powerful NDE tool for the measurement of the internal dimensions of constructed materials. existing capabilities include the determination of the thickness of asphalt, concrete, and granular material layers, and measurement of the depth and location of reinforcing steel. The equipment technology has been developed for data collection at up to normal traffic speeds (on pavements and bridge decks), and analytic techniques have been developed to automate he data processing.