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Comparative Susceptibility to Corrosion of Coated Expandable Bolts

  • J. HadjigeorgiouEmail author
  • Y. Savguira
  • S. J. Thorpe
Original Paper
  • 51 Downloads

Abstract

Exposure of ground support systems to corrosive environments in underground hard rock mines can result in a significant degradation and loss of performance. This can have significant repercussions on the structural integrity of excavations in rock and potentially endanger the safety of mine workers. The use of corrosion inhibitor coatings can extend the useful working life of expandable rock bolts exposed to corrosive environments and act as a risk mitigating factor. This paper reports an investigation on the relative resistance to corrosion of six different variants of expandable bolts based on coating type and load capacity. The bolts were submerged for 226 days under two distinct water environments in an underground mine in the Sudbury basin. A systematic methodology was developed to assess the relative performance based on image analysis, SEM/EDX analysis of the exposed rock bolts, and changes in the morphological nature of the corrosion process. The results demonstrated significant variations in the performance of the various expandable coated bolts. This has significant implications in the material selection process for suitable rock bolts for specific corrosive environments.

Keywords

Ground support Corrosion Coated rock bolts 

Notes

Acknowledgements

This work was undertaken for the purposes of a comparative investigation of different products in collaboration with an underground hard rock mine. No funding was provided by any of the rock bolt suppliers.

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Lassonde Institute of MiningUniversity of TorontoTorontoCanada
  2. 2.Department of Materials Science and EngineeringUniversity of TorontoTorontoCanada

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