Ground Penetrating Radar (GPR) Thickness Surveys of Three Neighborhoods in Williamsburg, Virginia Carried Out by Infrasense

Infrasense conducted a non-destructive survey and report of three neighborhoods comprised of 20 roads in Williamsburg, VA. The project provided the client with continuous thickness data of asphalt and underlying base layers, when present, along both directions of each lane.

Infrasense conducted a non-destructive survey and report on the main travel lanes of 7.6-miles of residential road in Williamsburg, VA. The project provided the client with tabular and graphical datasets plotted at a 5-ft interval along the centerline of each travel lane, with each point linked to precise GPS coordinates. These datasets paint a clear picture of how the asphalt wearing surface and underlying base layers change in thickness along the length of each road. The survey was conducted at driving speed with no closures, no disruption to traffic, and zero impact to the integrity of the road.

The GPR data collection system was made up of a 1 GHz horn antenna and a SIR 30 control unit, both manufactured by GSSI in Nashua, NH. The final report included a quantitative summary of average layer depths in each lane, along with visual plots showing the sub-surface strata along the length of the section.

The GPR pavement surveys are carried out according to ASTM D4748-10. The resulting data shows a cross-sectional slice of the pavement strata at various offsets. Each slice includes the surface, and any material change in the first few feet below the surface.

About Infrasense, Inc. 
Since 1987, Infrasense, Inc. has applied advanced technologies to address the most difficult challenges in subsurface scanning. Infrasense’s engineers nondestructively extract critical information from a diverse range of structures. In addition to providing ongoing subsurface evaluation services to clients across the country, the firm has also conducted numerous research programs to advance the field of subsurface detection and nondestructive evaluation. To learn more about Infrasense and the services we provide, visit our website: