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TDR2 pile integrity tester

The TDR2 is a lightweight and rugged, self-contained pile integrity testing system.

This highly versatile pile integrity test system can be used to test pre-cast concrete, cast-in-place concrete and timber piles of varying dimensions.

TDR2 can locate anomalies including shaft restraints, overbreak, cracks, reductions in sections and zones of poor quality concrete. This innovative system can also measure pile length, pile stiffness and mobility to further assess concrete quality and pile section.

Using solid state memory the TDR2 unit is built for security and speed of operation, with a backlit screen for working in dark environments. Supplied with a tough case and high quality waterproof connectors as standard, the unit can be easily transported and used in inclement weather conditions. 

Download the TDR2 product data sheet

Benefits of the TDR2 pile integrity test system:

  • Fast testing of 200 plus piles per day
  • Operates for up to 8 hours on full charge
  • Storage for over 700 results
  • Simulation software for analysis of pile and soil properties
  • Compliant with ASTM D5882 and AFNOR NFP94-160-2 & 4
  • James Fisher Testing Services' complete testing package available

All of our equipment is supplied fully calibrated to UK national standards.

TDR2 system specifications  
TDR2 unit
Features Twin channel hand held spectrum analyser
Daylight viewable screen
Tactile large keys for operating with gloves
Low power with long battery life
Flash memory for instant start up and power down
On-site length and stiffness measurement
Rugged lightweight unit with waterproof connectors
Keypad Sealed, colour coded and full alphanumeric keypad, tactile and audio feedback
Operating temperature 0°C to +50°C
Display Monochrome LCD transflective with back light
Contrast keypad, adjustable backlit display with auto-off
122mm x 77mm with protective plate
Acquisition  2 channel, 16 bit acquisition at 25KHz sample rate
Pre-trigger on both channels
Auto-ranging gain feature
Frequency range  0Hz to 5000Hz
Storage 700+ results, 3 data sets per pile with full header information - site, pile no, diameter, operator, transducers and date / time stamp 
Displays Velocity vs time
Force vs time
Force vs frequency
Mobility vs frequency
Accuracy - black tip Frequency - 0-1000Hz, ±0.5%
Mobility - 20-800Hz, ±15%
Mobility - 800-1000Hz, ±50%
Power Battery - 1.2V NiMH rechargeable AA cells
Auto power off and battery indicator
Battery life 8 hours + on full charge
Charge time Approx 6 hours
Charging External wall plug-in charger for 100/110/250VAC inputs (trickle charge)
External cigar plug-in charger for 12VDC inputs (fast charge)
Dimensions L 218mm x W 187mm x D 55mm
Weight 1.35kg
TDR impulse hammer 
Type Constant current load cell
Weight 1.2kg with fibre glass shaft
Nominal output 0.15 Volts/N
Frequency range 0-1000Hz (black tip)
500-5000Hz (aluminium tip)
Range 0-10,000N
TDR geophone  
Type Vertical SM-6
Natural frequency 4.5Hz
Nominal output 30 volts/m/sec
Operating temperature -30°C to +60°C

The TDR2 system is supplied with a powerful software analysis program, to enable more detailed analysis of changes in the pile section and the influence of soil. 

The TPAP software is an easy to use platform for analysing results and producing reports. Piles are tabulated and automatically sorted into numerical order, and test results can then be accessed directly from the table.

Analysis of pile length can be carried out either in the velocity or mobility views and interpretation can be confirmed using the simulation and impedance log modules, removing subjective elements.

Simulation modules

This powerful tool can be used to predict the mobility curve using soil and pile properties. It can also be used to assess piles with anomalies by using curve matching in real-time. Up to 10 geotechnical layers can be input to simulate real ground conditions.

Impedance log

The pile shaft inpedance is separated from soil effects and plotted against depth. This can effectively be viewed as a pile cross section profile. Often, complex time domain results can be resolved using this method. 



The Transient Dynamic Response (TDR) test is a rapid method of assessing the integrity of both pre-cast and cast in-situ concrete piles.

After ensuring that the concrete in the pile head is visually free of loose materials and contaminants, a geophone sensor is placed in contact with the pile head and struck axially using the systems force response hammer.

The response of both transducers is measured simultaneously, and the velocity and force signals and processed and displayed on the test unit. 

By assuming a wave speed velocity it is possible to calculate the pile length. Reflections can also be obtained from acoustic anomalies within the pile shaft. At low frequencies the response is generally linear allowing measurement of the dynamic pile head stiffness.

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