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JILS
421 E. El Segundo Blvd
El Segundo, CA
90245-3922
USA
Tel: +1 310 322 1920
        +1 310 322 1922
Fax: +1 310 322 5146
www.jilsfwd.com

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What is GPR?
 
RADAR is an acronym for Radio Detection And Ranging. It works by sending out electromagnetic energy and recording the reflections. The elapsed time between transmission and reception can be used to calculate the distance to the target. Furthermore, the strength of the reflection can provide insight on certain properties of the target material. This is very useful in pavement analysis in that asphalt layer thickness can be determined and various inferences can be made about each layer
 
Ground penetrating radar shares a lot in common with aerial search radar, but there are some differences. GPR is impulse radar. That means that the GPR system is sending short pulses of low-level electromagnetic (EM) energy into a material and measuring the effects that the material has on the reflection of the transmitted pulse. By analyzing the received radar reflections from the layer boundaries within a material, we can infer a few things about the material.We can measure asphalt thickness with GPR by transmitting a pulse into asphalt and measuring the time elapsed between the received reflection from the top of the
pavement and the reflection from the bottom of the pavement layer. This is known in GPR studies as the two-way travel time (TWTT) in the material, and is measured in nanoseconds (ns).
 
Why integrate FWD and GPR?
 
JILSIn order to provide the full picture of a road structure, it is essential to complement FWD information with existing asphalt thickness. Asphalt thickness can not be determined by the FWD system alone and is typically obtained by either assuming that either the thickness is constant or by sporadic coring. Assumptions are inaccurate, and not only is coring destructive to the pavement and dangerous because it requires traffic control and personnel, but a coring crew may also cost $2,000 per day.
 
Recognizing an opportunity for a solution, JILS teamed up with Geophysical Survey Systems (GSSI) to produce the most state of the art and cutting edge pavement
analysis system yet. GSSI is the world leader in the development and manufacture of Ground Penetrating Radar Systems, systems used to non-destructively explore the subsurface of the ground. Using GSSI's FCC certified RoadscanT GPR System, JILS changed road design for the better forever by integrating the GPR with the JILS truck-mounted FWD.
 
What are the benefits of this ground-breaking integration?
 
Cost Savings - Coring costs are dramatically reduced. There is not need to hire a coring crew, and the dual functioning machine allows for simultaneous FWD and GPR data collection.

Safety - Less time for personnel operating in dangerous traffic environments
 
Data Integration - FWD and pavement thickness data are integrated into a single database using JILS' JTEST Software.

Higher Data Density - Instead of obtaining asphalt thickness via coring once per mile, for example, a DOT can obtain real-time thickness at each of the same 2/10 of a mile testing points where the FWD data is commonly taken.

Data Quality - Pavement thickness at each FWD location provides designers with the data they need to determine accurate design criteria

Flexibility - The FWD vehicle may be used for independent GPR surveys at highway speeds eliminating the need for traffic control.
 
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