Bridges become an infrastructure problem as they get older, as de-icing salt and carbon dioxide gradually destroy the reinforced concrete. A new robot can now check the condition of these structures, even in places that people cannot reach.
We rely on Switzerland’s 3,500 motorway bridges – plus thousands more on cantonal roads – to carry us safely across valleys, streams, rivers and other roads. Most of these bridges have two factors in common: they are essential to Switzerland’s transport infrastructure and they are made of reinforced concrete. This material makes them safe and durable – until the onset of corrosion.
Corrosion jeopardises Swiss infrastructure
Corrosion occurs when chloride invades from de-icing salt and destroys the reinforcing steel inside concrete or when CO2 from the atmosphere lowers the concrete’s normally high pH. The damage becomes worse over time and is often visible only at a very advanced stage. In the long term, this can jeopardise the usability and safety of bridges and other supporting structures made of reinforced concrete. Furthermore, restoring these bridges is very expensive: the greater the damage caused by the corrosion, the more costly the repair work. “In addition, many bridges in Switzerland are already more than 50 years old, which makes corrosion increasingly problematic for Switzerland’s infrastructure,” explains Bernhard Elsener, professor at the Institute for Building Materials at ETH Zurich.
That is why Professor Elsener and a team of researchers developed the technology 25 years ago to identify corrosion at an early stage, attaching an electrode to a wheel and wheeling it across the surface of the reinforced concrete. The sensor measures the electric potential difference in the reinforced concrete – large differences mean that the reinforcement has already started to corrode in those areas. The data is transferred to a computer and then analysed.
The Latest on: Corrosion detection
via Google News
The Latest on: Corrosion detection
- FDA advisory committee: More data, consistent testing needed for metal-containing implantson November 18, 2019 at 11:23 am
“The panel generally feels that we need improved pre-clinical testing of devices that are to be placed in the body, especially in terms of corrosion testing,” Rao said. “We have to move beyond just ...
- Crucial Environmental Practices To Save Pipelines From Corrosionon November 18, 2019 at 10:12 am
... used to control corrosion by using a rectifier to drive the corrosion current away from the pipeline (called the “cathode”) to a sacrificial metal (called the “anode”), which will corrode instead ...
- Workshop on Electrochemical Techniques for Energy, Sensor, and Corrosionon November 18, 2019 at 5:02 am
and corrosion. Prof. R. K. Sinha, Director, CSIR-Central Scientific Instruments Organisation in his inaugural address said that there are various extremely important applications of electrochemistry ...
- What are the Detection Methods of Oil Casing Pipes?on November 16, 2019 at 3:47 pm
Penetration testing is suitable for a variety of metal and ceramic workpieces, and from the osmotic manipulation to the shortcomings, the light is relatively short, usually about half an hour, may be ...
- Global Ultrasonic Testing Equipment Market 2019-2023 | Rise in the Use of Phased Array Ultrasonic Testing Equipment to Boost Growth | Technavioon November 13, 2019 at 12:21 pm
They require regular maintenance to identify and avoid any leaks or corrosion. Ultrasonic testing is widely used in pipeline inspection as it offers various advantages over other NDT methods. The ...
- IMO 2020: Could bugs in biofuel eat into your engine?on November 11, 2019 at 8:21 am
“In the worst case, if microbial growth goes unchecked, then we are likely to see an increase in rapid microbiological induced corrosion of even the most well-maintained fuel ... and crew to quickly ...
- Tesla Nanocoatings might be about to hit a gusheron November 11, 2019 at 7:58 am
A major oil producer and smaller oil and gas customers are testing his coatings, including on offshore rigs in the Gulf of Mexico. If it works like Hawkins says it does and is approved for use, Tesla ...
- Tech firm secures £1 million to transform corrosion managementon November 11, 2019 at 6:00 am
A spin-out from Cranfield University, CorrosionRADAR's patented system enables the move away from manual inspections to automated monitoring, and from reactive to predictive corrosion management.
- Tech firm secures £1 million investment to tackle corrosionon November 11, 2019 at 1:30 am
A spin-out from Cranfield University, CorrosionRADAR’s patented system enables the move away from manual inspections to automated monitoring, and from reactive to predictive corrosion management.
- Rust buster wins £1m for corrosion detection technologyon November 8, 2019 at 5:37 am
A Cranfield University spin-out that has found a new way to detect corrosion and prevent leaks in assets such as pipelines has completed a £1 million funding round. CorrosionRADAR has secured ...
via Bing News