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Bridges are a vital part of our transportation networks, but as they age, they face a serious threat: corrosion. This damage is often caused by de-icing salts, carbon dioxide in the air, and water that seeps into tiny cracks. While this process can eventually lead to dangerous structural failures, it's usually not visible until it's too late—making repairs costly and sometimes even life-threatening. What if there was a way to catch the problem early? Well, there actually is—though it’s been around for over 25 years.
The method involves a simple device with an electrode attached to a wheel, which is rolled across concrete surfaces. As it moves, it measures the electrical potential of the concrete, helping identify areas where steel rebar has started to corrode. However, this technique has its limitations. The equipment is typically operated manually, making it difficult to reach hard-to-access areas like bridge pillars or the undersides of large structures.
To address this challenge, a team from Switzerland's Institute for Building Materials collaborated with the Institute of Robotics and Intelligent Systems. Their mission: create a robot capable of inspecting all parts of a bridge, including those humans can't easily access. They wanted the robot to detect corrosion at its earliest stages, reducing repair costs and preventing future collapses. The result was "Paraswift," later renamed "C2D2"—Climbing Corrosion Detective Device.
C2D2 uses Vortex technology, allowing it to stick to walls and ceilings using a rotating propeller and suction cups. It rolls along surfaces with wheels, guided remotely. Its design includes an electrode on the bottom for corrosion detection and a pink ball with a camera on top, helping operators spot obstacles and track the robot. C2D2 has already proven effective in detecting corrosion on Swiss bridges, and the team is working on adding autonomous navigation by mid-2015.
C2D2 isn’t the first robot used for infrastructure inspection. Redzone Robotics has been inspecting sewer lines since 2013, while Rolls-Royce has been using pipe-inspection robots since 1991, especially in nuclear facilities. Other systems coat pipelines to prevent leaks, and HiBot has developed robots to check high-voltage power lines.
Corrosion is a growing global issue, and with aging infrastructure and limited funds, the cost of repairs continues to rise. But with innovations like C2D2 and HJ3’s carbon fiber repair systems, we're taking steps to reduce the financial burden and keep our structures safe. If you want to learn more about how HJ3’s solutions can help save money on bridge repairs, contact us today.
June 25, 2025