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| Investigation and Analyses of Soil Corrosion in PCCP Pipeline of Guangdong Water Resources Allocation Project around Beibu Gulf |
| Received:July 23, 2024 Revised:January 09, 2025 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2025.03.012 |
| KeyWord:Water Resources Allocation Project Zhanjiang Branch PCCP soil corrosion corrosion level cathodic protection |
| Author | Institution |
| QIN Yongkun |
Nanjing Hydraulic Research Institute, Nanjing , China |
| LI Kaiyan |
Guangdong Yuehai Yuexi Water Supply Co., Ltd., Guangdong Zhanjiang , China |
| ZHANG Ciqin |
Guangdong Yuehai Yuexi Water Supply Co., Ltd., Guangdong Zhanjiang , China |
| LI Yan |
Nanjing Hydraulic Research Institute, Nanjing , China |
| YAO Zhendong |
Guangdong Hydropower Planning & Design Institute Co., Ltd., Guangzhou , China |
| XU Ning |
Nanjing Hydraulic Research Institute, Nanjing , China |
| LI Jun |
Nanjing Hydraulic Research Institute, Nanjing , China |
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| Abstract: |
| The work aims to investigate and analyze the soil corrosion level along Prestressed Concrete Cylinder Pipeline (PCCP) of Zhanjiang Branch of Guangdong Water Resources Allocation Project around Beibu Gulf to provide a basis for the cathodic protection design of PCCP. Parameters such as soil resistivity, pH value, oxidation reduction potential and chlorine ion content were detected to evaluate the corrosion level of soil to steel structure and rebar in concrete. The results showed that the pH value was in a range of 4.5-7.3 for a vast majority of measure points, which implied that most of the soil was weakly acidic. The oxidation reduction potential was generally higher than 400 mV. For the soil resistivity, the majority data of He-He segment was above 100 Ω.m, however, a higher proportion of the data in a range of 20-50 Ω.m was presented for He-Lei segment and Lei-Xu segment. In addition, most of the soil chlorine ion contents of He-He segment were around 100 mg/kg, and the ones of the He-Lei segment were in a range of 50-450 mg/kg. In special, a proportion of 95% of the chlorine ion contents was below 250 mg/kg for the Lei-Xu segment. In general, the soil corrosion level along PCCP of Zhanjiang Branch shows a slightly increase trend from north to south, involving a fact that the corrosion to steel structure is in the level of high, medium, weak and micro, wherein the proportion of medium and high corrosion is 41%. The level of micro and weak corrosion is exhibited to the rebar in concrete. |
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