Abstract
The corrosion of reinforcing steel in a concrete structure may compromise the strength, stiffness, impermeability, and long‐term performance of the structure. Near‐field microwave nondestructive testing (NDT) techniques are believed to offer an alternative to many existing destructive methods for chloride detection. To assess the potential of microwave NDT for this purpose, mortar cubes were produced and were cyclically exposed to a 2% NaCl solution, and their daily near‐field microwave reflection properties were measured for three cycles each lasting 110 days. In an effort to investigate the combined effects of loading and environmental exposure, one of the samples was periodically exposed to compression loading. Details of the measurement approach and the results are presented in this paper.
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