Ground Penetrating Radar (GPR) Thickness Survey of US-60 in James City County, Virginia Carried Out by Infrasense

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Infrasense conducted a non-destructive survey and report of US-60 and its associated turn lanes in James City County, VA. The project provided the client with continuous thickness data of asphalt and underlying base layers along the centerline of each lane.

Infrasense Survey Vehicle

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.

Infrasense conducted a pavement thickness survey and report for the travel lanes of a 2-mile stretch of US-60 in James City County, VA. Along this section of US-60, there were also 14 turn lanes that were surveyed and reported. 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 help visualize how the constructed layers of the roadway change in thickness along the length of each lane. 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. The data is processed and analyzed using proprietary internally developed software specifically designed for pavement and bridge assessments.

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:
http://www.infrasense.com

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Lori McCormick
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