Ground Penetrating Radar

Ground Penetrating Radar (GPR) is one of the most specialized and cost-effective inspection methods for the subsurface condition of pavements and bridge decks. Rii has been using GPR since 2002 and has utilized this technology across the country.

Get Comprehensive Results

Results typically provide information on bridge deck condition, pavement layer structure, joint conditions, and void areas under the pavements. GPR gives solutions for bridge and pavement rehabilitation projects with information supplied after testing, analysis, and evaluation. It offers positive and accurate delineation of deteriorated boundaries for reinforced bridge decks, accurate and quick confirmation of asphalt overlay measurements, and identification of rebar depth and spacing. GPR can be used to study pavement layer thicknesses, find voids under pavement, evaluate moisture or density variations, detect asphalt stripping zones, and assess the condition of concrete pavements.

Rii maintains the latest equipment and technologies needed to perform the analysis, testing, and evaluation of street and highway pavements and bridge decks. Surveys are performed with multiple scans so that 100% complete structure coverage is obtained. Depending on the objective of the survey, an appropriate antenna(s) is selected to best obtain the desired information in an efficient and economic fashion.

Using GPR with Falling Weight Deflectometer

Pavement thickness survey is one of the most useful applications of GPR to transportation systems for pavement management purposes at the network or project level.  GPR can be used to obtain the thickness of pavement layers and the thickness of the aggregate base layer.  GPR thickness data are used in the analysis of FWD (falling weight deflectometer) data to back-calculate elastic moduli of pavement layers.  The FWD data provide critical information regarding the pavements structural condition.  The combination of GPR and FWD are used to select the most effective method of roadway rehabilitation.  Pavement cores can be taken to provide additional information on the pavement, including pavement condition, base and subgrade material condition, and can be used to verify the GPR results.

Using GPR with IR

Ground penetrating radar is a well-established and accepted inspection method for accurately assessing the condition of reinforced concrete structures, while Infrared Thermography (IR) is a valuable and cost-effective method for locating concrete delamination/debonding in concrete bridge decks. The combination of IR and GPR is very powerful, maximizing the capabilities of each method and compensating for the limitations. Together, they offer a high degree of accuracy in locating deteriorated and debonded areas and provide a great deal of confidence in the overall deteriorated quantities.

GPR Additional Testing

Rii uses GPR to determine the condition of the concrete and locate reinforcing steel in concrete parapet walls and bridge pier caps.  GPR is also used to locate gravesites and Underground Storage Tanks (UST) and detect voids behind Mechanically Stabilized Earth (MSE) walls.

Geophysical Services

We have used GPR for client projects across the nation from New York to California performing pavement condition, geophysical services, and structure condition surveys for their capital improvement projects. Various applications of GPR include:

Bridge Deck Assessment

Continuous Pavement Layer Measurements

Pavement Structure Evaluation

Concrete Structural Inspection

Rebar Depth Profile

Post Tension Cable and Rebar Locating

Utility Locating

Grave Site Locating

Underground Storage Tank (UST) Locating

Other Non-Destructive Evaluation Services

Rii provides many comprehensive NDE services to help you evaluate your infrastructure and facility assets. Click here to learn more about the innovative technology we use to facilitate NDE services, and click here to learn more about Rii’s specialized Pavement Engineering services.

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