Concrete is the most widely used for construction materials in the world. Water\ncontent of concrete is an important parameter in terms durability of concrete\nstructures. Terahertz (THz) waves, for which concrete is a porous and\nabsorbable material, have been studied in order to establish a new non-contact\ninspection technology for maintenance of concrete structures. In this study,\nTHz transmittance and reflectance of concrete in drying process were measured\nwith a 60 GHz GUNN diode and absorption coefficient is analyzed for\nconcrete with various water contents. It is shown that quantitative detection\nbelow 10% is possible for the water content at surface area of concrete.
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