Application Note

Advanced Bridge Deck Assessments with Multichannel GPR

This application note describes how the GS9000 Multichannel GPR can be used on bridge deck assessments to detect diverse defects with high precision and efficiency.

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Infrastructure & Asset Inspection of Concrete Structures



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Identify subsurface defects in concrete and asphalt layers of bridge decks

Bridges, being essential components of infrastructure, demand meticulous scrutiny of their structural soundness. Traditionally, bridge condition assessments predominantly employed visual examination alongside specific non-destructive testing (NDT) methodologies like chain drag or hammer sounding.

However, the field of NDT has seen significant advancements in hardware and software, leading to the development of innovative techniques for comprehensive bridge condition evaluation. These advancements have notably improved surveying efficiency, precision, and productivity, yielding more intricate and precise outcomes.

Multiple NDT approaches could be considered for bridge deck assessments. These techniques include ground-penetrating radar (GPR), impact echo (IE), ultrasonic Pulse-Echo (UPE), ultrasonic surface waves (USW), half-cell potential (HCP), electrical resistivity (ER), and chain drag/hammer sounding. Each method has its strengths and effectiveness in assessing bridge conditions. This application note focuses on the use of the GS9000 multichannel GPR for bridge deck assessments.

Overview of Bridge Inspections with the GS9000 HF Antenna

The distinctive attributes of the GS9000 high-frequency (HF) antenna afford transformative potential for GPR applications, transcending the confines of traditional functionalities. The GS9000 HF antenna offers a revolutionary solution for the regular inspection of bridges and critical infrastructure. With its unique design featuring a 2.5 cm channel spacing and extended high-frequency coverage, this antenna surpasses conventional GPR systems in detecting and characterizing subsurface defects with unparalleled precision.

In the context of bridge inspections, the GS9000 HF antenna's closely spaced channels facilitate the precise detection and characterization of various defects in superior dense details. These include cracks on asphalt surfaces, patterns indicative of potholes, voids, and delaminations within both concrete and asphalt layers as seen in this recent case study.

Additionally, the antenna enhances the identification of deterioration areas attributed to scaling and decomposition within the constituents of the bridge deck's concrete structure. Its expanded high-frequency range facilitates the detection of diverse defect types, including corrosion-induced voids and moisture ingress, enhancing the overall assessment of structural integrity.


The GS9000 scanning the Fukuoka Expressway in Japan


By leveraging the enhanced resolution and sensitivity of the GS9000 HF antenna, along with the advanced output capabilities of tools like GPR Insights, inspectors can conduct thorough assessments of bridge structural integrity. This integration enables the deployment of proactive maintenance strategies, utilizing predictive analytics and efficient resource allocation.

Through sophisticated signal processing algorithms, inspectors derive actionable insights from GPR data, facilitating informed decision-making and extending asset longevity. This empowers them to precisely identify areas requiring targeted maintenance interventions, ensuring the continuous safety and functionality of the bridge infrastructure.

Ultimately, the GS9000 HF antenna redefines the standards of infrastructure inspection and management, offering a comprehensive solution for safeguarding critical assets.

See more application notes and customer case studies in our Tech Hub.

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