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Corrosion of cast iron pipelines buried in Fraser River silt subject to climate-induced moisture variations

Acta Geotechnica volume 16, pages 873–884 (2021)Cite this article

Abstract

Experiments were carried out to characterise the influence of soil water retention properties on the corrosion of a cast iron specimen buried in Fraser River silt. The corrosion rates were measured at different degrees of saturation using standard corrosion tests, along with separate water retention tests for the Fraser River silt. Building on previous work on this topic, a numerical model solving moisture flow, oxygen diffusion, electrical conductivity and their coupled influence on metallic corrosion in unsaturated soil was developed. The experimental data and preliminary numerical modelling results were then used as inputs to a field-scale numerical model to examine climate-induced moisture migration around a pipeline and the resulting levels of corrosion. The time-dependent corrosion mass loss and the resulting loss in pipe wall thickness of a buried pipeline were modelled, and it was demonstrated that the cyclic climatic variations predominantly perturb the corrosion rates during the initial cycles, and subsequently a gradual corrosion rate arises depending on general climatic conditions. Further analysis of the influence of electrical resistivity on the levels of corrosion revealed that a decrease in resistivity due to effects such as seawater intrusion or naturally saline soils may result in a significant increase in the levels of localised corrosion.

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Acknowledgements

The authors wish to acknowledge the Pipeline Integrity Institute and the University of British Columbia for the assistance provided for some of the experimental work. Rukshan Azoor acknowledges the Monash University International Postgraduate Research Scholarship (MIPRS), the Monash Graduate Scholarship (MGS), the Graduate Research International Travel Award (GRITA) and the Postgraduate Publications Award (PPA) provided for his PhD studies.

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Authors and Affiliations

  1. Department of Civil Engineering, Monash University, Clayton, VIC, 3800, Australia

    Rukshan Azoor, Ravin Deo & Jayantha Kodikara

  2. Department of Materials Engineering, University of British Columbia, 309-6350 Stores Road, Vancouver, BC, V6T 1Z4, Canada

    Edouard Asselin

  3. Department of Civil Engineering, University of British Columbia, 6250 Applied Science Lane, Vancouver, BC, V6T 1Z4, Canada

    Dharma Wijewickreme

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  1. Rukshan Azoor
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Correspondence to Jayantha Kodikara.

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Azoor, R., Asselin, E., Deo, R. et al. Corrosion of cast iron pipelines buried in Fraser River silt subject to climate-induced moisture variations. Acta Geotech. 16, 873–884 (2021). https://doi.org/10.1007/s11440-020-01061-0

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Keywords

  • Electrical resistivity
  • Underground corrosion
  • Unsaturated soil