Non-destructive testing (NDT) of concrete, masonry and steel is used to identify problems, verify compliance, and/or identify obstacles within these materials. By using specialized equipment and visual inspection, these tests do not compromise the structural integrity of these materials. Advanced Special Inspection, Inc. provides experienced technicians, knowledgeable in their field, who can deliver safe and accurate results.
In structural steel, NDT is used to detect discontinuities within the internal structure of welded connections or within the steel itself. ASI’s Technicians are certified by the American Society for Non-destructive Testing (ASNT).
THE MOST COMMON TESTS INCLUDE:
- Ultrasonic Testing – utilizes high-frequency vibrations to detect discontinuities
- Radiographic (X-ray) Testing – utilizes a radioactive isotope to detect discontinuities
- Magnetic Particle Testing – utilizes a magnetic flux to detect discontinuities
- Dye-penetrant Testing – utilizes a dye and developer to detect surface discontinuities
OTHER TYPES OF NDT COMMONLY USED FOR STEEL INCLUDE:
- Visual Inspection – performed by a qualified inspector who identifies discontinuities with the naked eye
- Skidmore – specialized device used to test torque and tension values of fasteners and tools
- Torque Testing – determines the torque value of fasteners
NDT in concrete and masonry is used to locate intrusions and obstacles such as rebar, post-tension cables, conduits and voids.
THIS IS TYPICALLY ACHIEVED BY USE OF:
- X-ray and Isotope Radiography – clearest and most definitive method of identifying and locating obstructions
- Ground-penetrating Radar (GPR) – utilizes radar, safe to use, accurate, cost-effective
OTHER FORMS OF NDT COMMONLY USED ON CONCRETE ARE:
- Pull/Load & Torque Test – verifies adequate embedment strength of bolts, fasteners, or rebar
- Schmidt Hammer – determines approximate strength of existing concrete
- Calcium Chloride Test – identifies moisture in existing concrete
- Half-cell Potential Test – determines extent of rebar or cable corrosion (may involve some destruction to gain access to subject)