ICGCM Papers:
New Ground Control Product Developments
 
 
Laboratory and Field Testing of Bolting Systems Subjected to Highly Corrosive Environments
35th International Conference on Ground Control in Mining
Laboratory and Field Testing of Bolting Systems Subjected to Highly Corrosive Environments
by
Tom Meikle, Minova, Richmond VAle, AustraliaStephen C Tadolini, Minova, Georgetown, United StatesBre-Anne Sainsbury, Monash University, Caulfield, AustraliaJohn Bolton, Minova, Richmond VAle, Australia
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[Conference] 35th International Conference on Ground Control in Mining
[Price] Free  [Comments] 0
[Topical Area] New Ground Control Product Developments
[Author] Tom Meikle, Minova, Richmond VAle, AustraliaStephen C Tadolini, Minova, Georgetown, United StatesBre-Anne Sainsbury, Monash University, Caulfield, AustraliaJohn Bolton, Minova, Richmond VAle, Australia
[Abstract] 
Key Conclusions:
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Corrosive ground control conditions can be difficult to control and be extremely hazardous to workers. Previous developments have been partially successful in extending the service life of support bolts and fixtures. The Enduro coating, tested under extreme laboratory and field conditions, provides superior corrosion protection using patented cathodic dip coating processes combined with thermoplastic powder coatings. The coatings can be used in mining, civil and tunneling applications and expected life can even exceed that of stainless steel.
Key Findings:
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The patented thermoplastic coating processes (Enduro coating) on roof supports was subjected to acetic acid salt spray (AASS) laboratory testing at independent laboratories - life expectancy was increased up to 100 times when compared to non-protected supports. Three field sites established in PH conditions ranging from 1.5 - 9 were examined using Enduro bolts and traditional non-protected bolts. The areas supported with traditional bolts have experienced failures and required additional remediation and support, which have directly affected development rates and increased production costs. Test results show conclusively that this coating is superior to stainless steel, often felt to be the magic wand in extremely corrosive ground conditions.
Objective of the Paper:
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A innovative coating has been developed and tested in both laboratory and field conditions under extremely corrosive ranges from 1 to 9 PH. The coating process and application will be detailed and independent laboratory testing results presented. Finally, the field results from 3 case studies that have a range of PH conditions will be detailed with measurement data
Problem Statement:
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Ground supports affected by corrosion can lead to support and subsequent ground failures. These can result in hazardous conditions and costly rehabilitation. Traditional coatings and sacrificial layers have been ineffective and have serve as a placebo in addressing these conditions.