The Slab Impulse Response (SIR) method is used primarily to identify and map subgrade voids below slabs-on-grade.
- Fast, one-sided testing
- Most effective on thinner slabs (less than 12 inches thick)
- Limited to slab thicknesses of less than 20 to 24 inches
SIR can be used to:
- Evaluate the support conditions before and after repairs of slab subgrade
- Look for low-stiffness areas associated with hidden damage (honeycomb, void, or cracking) for general assessment of concrete structures
- Subgrade void detection and mapping, in conjunction with Ground Penetrating Radar
Applicable On:
Concrete Structures
Reinforced and Nonreinforced Concrete Slabs
Pavements
Runways
Spillways
Pond and Pool Bottoms
Tunnel Liners
Asphalt or Asphalt-Overlay Slabs
Test For:
Subgrade Void Detection
Evaluating Repair of Slab Subgrade Support up to 2 Feet Thick
The SIR System
Diagnose Defects
Identify and map subgrade voids below slabs-on-grade
Evaluate
General condition evaluation of structural elements
Comparison
Evaluate the repair of slab subgrade support conditions by comparing the support conditions before and after repairs
Variety of Applications
Test on concrete slabs, pavements, runways, spillways, pond and pool bottoms, and tunnel liners
Combine Methods
This method is often used in conjunction with GPR