Slab Impulse Response
(photo gallery)
Product FlyerThe Slab Impulse Response method is excellent for evaluating the condition of slab subgrade support.
The Slab Impulse Response (SIR) system is designed to identify subgrade voids below slabs-on-grade less than two feet thick. In addition, the Slab IR test method can be used on other concrete structures to quickly locate areas with delaminations or voids in the concrete, if the damage is relatively shallow. Slab IR can be performed on reinforced and non-reinforced concrete slabs as well as asphalt or asphalt-overlay slabs.
The Slab IR testing method is often used in conjunction with GPR for subgrade void detection and mapping. Collecting Slab IR data at multiple, densely spaced locations can improve the conclusions by mapping relative areas of higher and lower mobility. Relatively low mobility (velocity/force) and flexibility (displacement/force) qualitatively indicates that such an area appears to be more solidly supported than an area with relatively high mobility and flexibility.
Data Platform Required, Sold Separately
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Freedom Data PC |
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NDE 360 |
Applicable On:
- Concrete Slabs
- Pavements
- Pool Bottoms
- Pond Bottoms
- Runways
- Spillways
- Tunnel Liners
Test For:
- Delaminations in Decks
- Soft, Weak Subgrade Support
- Voids below Slabs/Tunnel Linings
Meets ASTM:
- N/A
Meets ACI:
- ACI 228.2R
Key Features & Specifications
| System is compact, durable, and easily transported allowing for up to 600 tests per day | Real-time waveform display while testing |
| Short learning curve for data acquisition and basic processing | 2-D maps are easily generated from data by exporting the tables from Olson's WinSIR software into Excel |
| English or Metric units can be used | Can be performed on reinforced and non-reinforced concrete slabs as well as asphalt or asphalt-overlay slabs |
SIR-1 Model [Base Model]
| Description: | Test For: | Applicable On: |
| Complete system for testing slabs-on-grade. Create 2-D contour maps by importing the results table into popular spreadsheet programs. These renderings are often a valuable resource for isolating and repairing voids below slabs-on-grade.
This model includes a vertical geophone transducer appropriate for testing flat slabs, an instrumented hammer, cables, and the acquisition/processing software. |
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SIR-2 Model
| Description: | Test For: | Applicable On: |
| The SIR-2 Model includes the addition of an omni-directional velocity transducer to perform tests on inclined spillways as well as walls and ceilings of concrete tunnels/structures. |
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Hands-on training is available for all of our NDE test methods at our Wheat Ridge, Colorado (USA) location, which is a suburb located approximately 15 minutes northwest of downtown Denver. Training may be available at your location by one of our agents/engineers upon special arrangement.