Exact probe of the reinforcing steel in RC structures and its application to ultrasonic CT

In the maintenance of RC (reinforced concrete) structures,

it being very important to know the exact position of the reinforcing

steel, there has not been developed a technique to detect the exact

position of the reinforcing steel, for the time being.

  In this talk, we develop a theory to exactly probe the reinforcing

steel in RC structures by application of an apparatus to measure

thickness of concrete cover for reinforcing steel by electromagnetic

induction method, whose measurements are well known to be inexact

because of the errors and the noises the apparatus contains.

  For the exact probe of the reinforcing steel,

the idea of the least square solution plays an important role.

  We also show the results of our experiments to verify our theory

and mention the importance of our theory in view of the development of

ultrasonic CT (computerized tomography) for RC structures.

(This is a joint work with N. Mita, T. Ochi, K. Hashizume and T. Takabatake)

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