Infrasense carries out the Evaluation of Pascack Road Bridge Deck in NY using Ground Penetrating Radar (GPR)

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Quantifying and mapping concrete deterioration on asphalt overlaid bridge deck carrying I-87 in New York

GPR Condition Evaluation of Pascack Road Bridge Deck

In addition to being deployed at driving speeds, GPR has the ability to penetrate and detect deterioration through the full thickness of the deck, regardless of the presence of an overlay

In order to facilitate rehabilitation planning of an asphalt overlaid bridge deck carrying I-87 over Pascack Road, ground penetrating radar (GPR) was used to quantify and map concrete deterioration.
The GPR data was carried out at driving speeds using a vehicle-based system, so no lane closures were required. In addition to being deployed at driving speeds, GPR has the ability to penetrate and detect deterioration through the full thickness of the deck, regardless of the presence of an overlay. The GPR equipment used for this survey was a dual 2-GHz air-coupled horn antenna system manufactured by GSSI, Inc. of Nashua, NH.

This bridge deck analysis was carried out according to ASTM D6087-08 using Infrasense's proprietary software, winDECAR® and was surveyed with 40 lines of GPR data, each representing a longitudinal cross-section through the deck. The cross-section shows the different structural layers of the bridge deck including the bottom of the asphalt overlay, top reinforcing steel, and bottom of the deck. The amplitude of these layers is calculated and then quantities and maps of concrete deterioration, asphalt overlay thickness, and concrete cover are produced. The resulting maps are provided in both PDF and CADD compatible formats.

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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