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Olson - Impact Echo Scanning (IES) System
Impact Echo Scanning (IES) investigations are performed on large structural members with smooth concrete where shallow voids, honeycomb, cracking or delaminations are of primary concern. The Impact Echo Scanning (IES) system is designed for large area investigations of shallow voids, debonding/delamination, cracking, or honeycomb often found between an overlay on a bridge deck or surrounding dense rebar mats. IES is commonly used to evaluate post-tensioning (PT) cables used in reinforcing various structures and determining duct grout condition. The scanning technology allows tracing of ungrouted PT cables through slabs and beams. An advantage of the IES method is that only one side of the structure needs to be accessible for testing.
The IES Method is based on the Olson Engineering patented technology of a rolling transducer and automated impactor for near-continuous Impact Echo based thickness and flaw scanning of structural concrete and pavements. Performed at slow walking speeds, test results are obtained every inch (25 mm) in a line and multiple lines can be combined for 2-D to 3-D displays of concrete thickness and locations of internal void, honeycomb, cracking, delamination, etc. The scanning method is capable of determining bottom echo thicknesses up to ~ 40 inches (1 m).
- Beams
- Bridge Decks
- Columns
- Dams
- Pavements
- Pipes
- Post-Tensioned Ducts
- Runways
- Slabs
- Tunnels
- Walls
- Cracks
- Delaminations
- Honeycomb
- Thickness
- Voids
- ASTM C1383-04
- N/A
- Thickness accuracy ± 2% at high resolution when calibrated on a known thickness
- No coupling agents required for use of test head on concrete
- Thousands of tests can be performed per hour when “imaging” of internal concrete conditions is required
- Works on cured, hardened concrete in air or on grade
- System is compact, durable, and easily transported allowing for multiple tests per day
- Works through paint and most types of bonded tile
- Real-time waveform display while testing
- Easy velocity calibration at known thickness
- Software allows for more sophisticated processing
- Thickness maps are easily constructed from data
- English or Metric units can be used