NON-DESTRUCTIVE MEASUREMENT OF AIR VOIDS AT THE REINFORCING STEEL-CONCRETE INTERFACE

摘要

Voids in concrete are known to be sites of accelerated corrosion of reinforcing bar. A sensor was developed in the form of a reinforcing steel rod with a rubber-sleeve covering, and the sleeve inflated to measure the air void volume in the embedded concrete. The sensor was found to measure entrapped air void volumes with good accuracy; minimum and maximum void volume capabilities were estimated at 1 and 6% respectively. Development of the sensor for practical application is discussed here.