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DOI : 10.17640/KSWST.2018.26.4.23 , Vol.26, No.4, 23 ~ 32, 2018
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| Title |
| An Assessment of Physical Properties and Service Life on Lining and Coating According to Years of Aging |
| 김재학 Jea-hag Kim , 배철호 Cheol-ho Bae , 김정현 Jeong-hyun Kim , 신은허 Eun-hur Shin , 김경필 Kyoung-pil Kim , 구자용 Jayong Koo |
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| Abstract |
| The purpose of this study was to investigate the peeling percent, EIS, and neutralization degree of the inner lining and outer coating materials used to protect large diameter steel pipe or cast iron pipe from corrosion. And the service life of the inner lining and outer coating materials were predicted. The results are as follows. First, the peeling percent of the coal-tar enamel lining was estimated to be more than 10% after the age of 15 years or 19 years. And the electro impedance spectroscopy(EIS) was predicted that it reduced under 6 log (/Z/ohm) after 22 years, so that the protection of the pipe surface from corrosion would be lost. On the other hands, the EIS of outer coal-tar enamel coatings was predicted after about 28 years. Second, the epoxy resin lining is expected to have a slightly longer service life compared to inner coal-tar enamel lining, although the years of aging are close to 20 years. The EIS was predicted to be reached at 6 log (/Z/ohm) after at least 60 years. However the relationship coefficient of prediction function was low as 0.11. Third, the cement mortar lining used in ductile iron casting pipe was predicted to lose the function of CML after 40 years at under 450 mm diameter and at least after 60 years over 500 mm diameter. |
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| Key Words |
| Coating, Large water pipe, Lining, Physical properties |
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