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GPR

The pavement structure is the most valuable and critical component of any highway network. Transportation departments around the world are increasingly taking the view that pavement construction data forms a crucial part of the asset inventory and that a coordinated Ground Penetrating Radar (GPR) and coring survey is the logical means of providing it. Construction inventory data enables highway managers to base objective asset valuations and effective maintenance strategies on a comprehensive record of construction materials and thicknesses. GPR surveys are quick and cost effective and the data provides a better reflection of the current actual construction than reliance on construction records or widely spaced core samples. The results will help you get the most from other datasets such as deflection or surface condition, and can help target further surveys or highlight areas requiring treatment.

The experience and competence of the people surveying your network, analyzing your data and managing your project are critical. Our pavement specialists were amongst the world’s first to undertake traffic speed GPR highway surveys and have collected over 750,000 miles of pavement data on six continents. Our processes are accredited to international standards and robust procedures ensure high levels of repeatability and accuracy over projects lasting a few weeks to several years. Sophisticated database, processing and analysis tools are used by highly qualified analysts to enable cost effective productivity and reliable output.

Our network surveys involve collection of multiple datastreams at traffic speeds. Not only does this reduce cost, environmental footprint and accident risk, but it provides a seamless record of surface condition and subsurface structure. Fugro’s ARAN survey vehicle provides an ideal platform for such multi-purpose surveys. Multi-channel radar systems are used in order to resolve near-surface detail and to penetrate to the sub-layers. The typical sampling rate at 55 mph is one scan every 10 inches. The surface area or footprint examined depends on the antenna configuration, but is typically about 12 inches wide at a depth of 12 inches. Positional control is achieved using a combination of d-GPS, inertial measurement and distance measurement, providing linear relocation accurate to within a few feet at 55 mph.

Data summarizing pavement thickness, material type and the location of construction changes can be reported on a point or continuous basis. Output can be supplied in a wide range of client specified GIS referenced database formats.

Using Fugro’s iVision application, agencies can see their construction data synchronized with geo-referenced video, map and surface condition data and all the other ARAN datasets. There is no need for specialist software installation or for data storage because the application is web-hosted making it easy for teams to share, view and interrogate data.

Download the GPR brochure.

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