Microwaves used to sniff out corrosion deep inside concrete
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Doctors regularly use forms of electromagnetic radiation such as x-rays to detect broken bones and internal damage inside the human body. Now, researchers at the US National Institute of Standards and Technology (NIST) have developed a similar technique that can search for signs of corrosion of iron and steel located deep inside concrete. Corrosion in iron and steel is caused when water and oxygen combine with the metals to produce iron oxide products. The two most common are the minerals goethite (brown rust) and hematite. Researchers have demonstrated that terahertz radiation – electromagnetic waves with frequencies 10 to 100 times…
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