A Corrosion Monitoring System for Existing Reinforced Concrete Structures

Details

• Creators:
  Shi, Xianming ; Ye, Zhirui ; Muthumani, Anburaj ; Zhang, Yan ; Dante, James F. ; Yu, Hui
• Corporate Creators:
  Western Transportation Institute
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  Bridges And Other Structures Chlorides Corrosion Field Studies Highways I61: Equipment And Maintenance Methods Laboratory Tests Maintenance And Preservation Reinforced Concrete Reinforcing Bars Research Hub Sensors Structural Health Monitoring

  More +
• Publication/ Report Number:
  FHWA-OR-RD-15-14
• Resource Type:
  Tech Report
• Geographical Coverage:
  Oregon;United States
• Edition:
  Final Report
• Corporate Publisher:
  Oregon. Dept. of Transportation. Research Section
• Abstract:
  This study evaluated a multi-parameter corrosion monitoring system for existing reinforced concrete structures in chloride-laden service environments. The system was fabricated based on a prototype concrete corrosion measurement system that had been built and patented by Southwest Research Institute (SwRI). In a laboratory benchmark test, a chloride concentration vs. potential calibration curve was established and indicated good linearity between 0.01 mol/L and 1 mol/L. The general and maximum localized corrosion rates, as measured by the Multi-electrode Array Sensor (MAS) probe, were all sensitive to the incremental chloride concentration in a simulated pore solution. However, once active corrosion is initiated and a great amount of chloride is present, the MAS probe may no longer serve as a good tool to predict the corrosion rate of rebar unless more research is conducted to establish such prediction or correlation. It was also revealed that in a sensor longevity test, only a fraction of sensors can be considered reliable after eight accelerated weathering cycles. In addition, a laboratory pilot-scale test was done by incorporating an array of three sensing units at different depth of a mortar cylinder to monitor the ingress of chloride and the corrosion rate of rebar at different depths. The results identified many challenges to improve the sensor probe. A detailed guideline along with video documentation was developed as a reference to guide field implementation. A field deployment of the system in an Oregon Department of Transportation (ODOT) bridge pier was attempted for a few months. However, future research into improvements of the sensor system is needed to achieve a successful field application.
• Format:
  PDF
• Funding:
  SPR 736
• Collection(s):
  University Transportation Centers US Transportation Collection
• Main Document Checksum:
  urn:sha-512:62a802c728e41e7a7d0d52cb806aaf03176c4ba6a37d2726699adfac058798241d6de6876d2bc55840ab712d0b5aa5dec716365827829b0279728be44b79f686
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28905/dot_28905_DS1.pdf
• File Type:
  [PDF - 4.18 MB ]