Void Detection in Grout-Filled Sheath Tube by RF Propagation

Abstract

A grout-filled sheath tube is a key part of prestressed concrete (PC) for strength and durability, and voids in grout endanger PC structures. This paper is to report the initial investigation on void detection by RF reflection through sheath tube. The content includes the results of simulation, void detection experiment on model sheath tube, and measurement of dielectric constant of grout. These results indicate positive evidence.