Accession Number : ADD017267

Title :   Nondestructive Testing Apparatus for Determining the Orientation of Reinforcing Bars Within a Concrete Structure.

Descriptive Note : Patent, Filed 17 Dec 92, patented 16 Aug 94,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Kruchowy, Roman ; Goff, Dan ; Smith, Anthony

Report Date : 16 Aug 1994

Pagination or Media Count : 14

Abstract : A measuring apparatus which accurately locates reinforcing bars in underwater concrete structures such as piers, retaining walls, easements and the like and measures the amount of concrete covering each reinforcing bar. The measuring apparatus comprises a probe which generates a magnetic field and which is moved over the surface of the underwater concrete structure under test When the poles of the magnetic field are in parallel alignment with and directly over a reinforcing bar within the structure a disturbance occurs in the magnetic field with the magnitude of the disturbance being indicative of the depth of concrete covering the reinforcing bar. An electronics module electrically coupled to the probe provides an analog output signal which is indicative of the distance between a reinforcing bar within the concrete structure under test and the probe. This analog signal is supplied to a meter which provides a visual indication of the location of the reinforcing bar and a microprocessor which then calculates the depth of the reinforcing bar within the concrete structure. (mm)

Descriptors :   *CONCRETE, *MAGNETIC DETECTORS, *REINFORCING MATERIALS, *UNDERWATER STRUCTURES, *REINFORCED CONCRETE, *PATENTS, MAGNETIC FIELDS, NONDESTRUCTIVE TESTING, ORIENTATION(DIRECTION), MEASURING INSTRUMENTS, WEAR, PIERS, SEA WATER CORROSION, LOCATORS

Subject Categories : Laminates and Composite Materials
      Civil Engineering
      Structural Engineering and Building Technology
      Magnetic & Electric Fld Detection & Detectors
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE