| Summary: | 碩士 === 國立臺灣大學 === 材料科學與工程學研究所 === 86 === In this research, the major work is focused on surface electrochemical
test, which is a nondestructive testing. The facial and interior
characteristics of different types of materials－artificial graphite,
montmorillonite, mortar and reinforced mortar－are estimated by means of
computer calculating and plotting. The study contains three subjects:
First, surface potential measurements made between two half-cell
electrodes will indicate that the different interior oxidation-reduction
reactions caused the different surface potential disposal and the influence
of reinforcing steel in mortar.
Next is performed Wenner four-electrodes method to determine the features
of interior structure. According to deriving the theoretical equations, it
revealed the difference of structures would cause variable impedance. It
then describes the features of impedance, structures, and homogeneity would
result in the interior oxidation-reduction reactions. About this results is
proved by the results of surface potential measurements. In addition, under
the relationship with the distances between measured electrodes and probing
depth, it could determine the location and depth of the embedded reinforcing
steel.
Third, electrochemical impedance spectroscopy was used to probe the
mechanism of testing materials, and reaction parameters evaluated using an
equivalent circuit model. It could indicate the characteristics of
equivalent circuit elements interior and the reducing phenomenon of
impedance reduced by the embedded reinforcing steel.
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