Network GPR Surveys in Virginia and Louisiana
Fugro Roadware recently performed GPR surveys in Virginia and Louisiana. Both jurisdictions needed subsurface pavement construction information, but for different reasons.
The Virginia DOT required more accurate construction information for its pavement management system (PMS). Variances in recent load-bearing tests had raised questions about the existing data’s reliability. The Louisiana DOTD needed to make its case for federal funding to repair damage
caused by Hurricane Katrina.
Much of North America’s road network is decades old. Highways have been widened, connected and resurfaced repeatedly. Construction and repair records are often unavailable. Coring is one option. However, Ground Penetrating Radar (GPR) is a more cost-effective, non-destructive and
What We Did
In both cases, Fugro:
- Collected GPR data using standard ARAN vehicles
- Collected pavement data along with pavement management survey all with a single pass
- Scanned through all engineered layers of pavement—up to 40 in. (1 m) deep
- Sampled at rates of up to one scan per 20 in. (0.5 m) at 50 miles (80 km) per hour
- Directed the requirement for and location of core samples
- Provided detailed reports of layer thickness values within construction segments
- Delivered the data in PMS-compatible formats for use with client systems
Virginia was able to collect reliable data without heavy use of coring. Louisiana was able to obtain the science-based information it needed to
make its case for post-Katrina highway reconstruction funding.
“The road itself is a state highway authority’s single most valuable asset. GPR analysis is the best way to understand what that resource is really worth.” ~ Allan Venema, Project Manager
Fugro’s GPR services leverage:
- A North American fleet of 18 ARAN vehicles with experienced data collection teams
- GSSI SIR30 GPR data collection systems capable of scanning 12 in. (0.3 m) wide x 40 in. (1.0 m) deep, scanning every 10 in. (0.25 m) at highway speeds
- Multi-channel GPR with three antennas measuring 900, 1600 and 3000 MHz frequencies
- Fugro’s experience analysing, interpreting and reporting on GPR surveys worldwide
Network level GPR-based pavement information is ideal when a highway
- Pavement structure information to make informed decisions
- Support to interpret other pavement measures, such as surface condition and deflection
- Science-based evidence of deterioration caused by wear or an event
- To understand the residual value of its highway network
- To reduce risk of unknown factors during maintenance and reconstruction
To see the entire case study, click here.
Copyright Fugro Roadware 2013.