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A method to measure the neutralization depth and chloride ion (Cl) penetration depth was investigated by drilling a hole with a diameter of 1 or 2 mm onto a concrete surface and observing the interior by inserting a fibrescope with a diameter of 0.6 mm. This method was intended as a semi-destructive test with high accuracy and minimum damage, which avoids aesthetic defects to the concrete structure. During the measurement, to visualize the neutralization depth or Cl penetration depth, a phenolphthalein solution or silver nitrate solution was sprayed onto the drill hole. The effect of the extent of the drill hole surface’s drying and the spraying amount of solutions on the clarity of coloration with a phenolphthalein solution or silver nitrate solution were investigated. It was found that it is preferable that the concrete surface is sufficiently dry for a clear coloration by a phenolphthalein solution, and it is preferable that the concrete surface is wet for the clear coloration with silver nitrate solution, although the spraying amount did not make much difference on the coloration by both colour indexes. A comparison with the results obtained through measurements using calipers on the cut surface reveals that the proposed method is highly reliable.

Development and verification of neutralization depth and chloride ion penetration depth measurement method using fibrescope