철근콘크리트구조물에서 콘크리트의 전기저항 측정에 미치는 내부철근 및 환경변수의 영향 (Influence of Environmental Factors and Reinforcing Steel Bars on the Measurement of Concrete Resistivity in RC Structures)

서지정보

· 발행기관 : 대한건축학회
· 수록지 정보 : 대한건축학회논문집 구조계 / 25권 / 6호 / 91 ~ 98페이지
· 저자명 : 소형석

초록

The measurement of concrete resistivity, when used in conjunction with potential mapping, may be used to assess the probable
location and severity of reinforcement corrosion problems in in-situ RC structures. However, the presence of the reinforcing steel
may itself cause an error in the measurement of concrete resistivity by providing an electrical short circuit. In this paper, the
rate of corrosion of steel embedded in concrete has been evaluated by the measurement of concrete resistivity using the Wenner
technique (4-probe array system) and compared with the results measured by linear polarization resistance(LPR) method which
has been developed to direct measure the corrosion rate of reinforcing steel in concrete. The influence of reinforcing steel on the
measurement of concrete resistivity has been also investigated using steel reinforcement with a number of different diameters,
cover depth of concrete and the presence of chloride ions in concrete, and observed the effect of environmental factors on the
concrete resistivity measurements to assess externally exposed reinforced concrete. The results was shown that the measurement
of concrete resistivity promises to be taken quickly, accurately and without causing damage to in-situ reinforced concrete
structures, in the assessment of the presence and rate of corrosion of reinforcing steel in concrete. However, reading was
influenced by the presence of reinforcing bars and its influence was increased with increasing of the diameter of steel bar and
with decreasing of concrete cover depth and compressive strength of concrete. The measurement of concrete resistivity was
significantly influenced by the ambient temperature and rainfall.

영어초록

The measurement of concrete resistivity, when used in conjunction with potential mapping, may be used to assess the probable
location and severity of reinforcement corrosion problems in in-situ RC structures. However, the presence of the reinforcing steel
may itself cause an error in the measurement of concrete resistivity by providing an electrical short circuit. In this paper, the
rate of corrosion of steel embedded in concrete has been evaluated by the measurement of concrete resistivity using the Wenner
technique (4-probe array system) and compared with the results measured by linear polarization resistance(LPR) method which
has been developed to direct measure the corrosion rate of reinforcing steel in concrete. The influence of reinforcing steel on the
measurement of concrete resistivity has been also investigated using steel reinforcement with a number of different diameters,
cover depth of concrete and the presence of chloride ions in concrete, and observed the effect of environmental factors on the
concrete resistivity measurements to assess externally exposed reinforced concrete. The results was shown that the measurement
of concrete resistivity promises to be taken quickly, accurately and without causing damage to in-situ reinforced concrete
structures, in the assessment of the presence and rate of corrosion of reinforcing steel in concrete. However, reading was
influenced by the presence of reinforcing bars and its influence was increased with increasing of the diameter of steel bar and
with decreasing of concrete cover depth and compressive strength of concrete. The measurement of concrete resistivity was
significantly influenced by the ambient temperature and rainfall.

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