Friction rock stabilizers (FRS) are routinely used to provide rock reinforcement to excavations in hard rock. Since the expiration of the original patent taken out in 1977, FRS are now available from multiple suppliers. The expectation that all FRS are equivalent, however, is not necessarily accurate. There are inherent variations in the design configuration, material chemistry/properties, and consequently in performance. In this context, a full traceability from steel grade and heat treatment to final product is critical. This paper reports the results of a QA/QC investigation aiming to identify the material properties for three equivalent FRS from the same supplier. A series of mechanical and accelerated corrosion tests highlighted the differences in these rockbolts. This work provides a template for a more comprehensive quality assurance programme to ensure compliance of FRS. This is critical when rockbolts, due to global supply chain constraints, are outsourced from multiple sources worldwide.
A1011/A1011M-17. Standard specification for steel, sheet and strip, hot-rolled, carbon, structural, high-strength low-alloy, high-strength low-alloy with improved formability, and ultra-high strength. West Conshohocken (PA): ASTM International.
2.
AbosrraL, AshourAF, MitchellSC, YouseffiM.2009. Corrosion of mild steel and 316L austenitic stainless steel with different surface roughness in sodium chloride saline solution. WIT Transactions on Engineering Sciences, Vol 65, WIT Press - Simulation of Electrochemical Processes III; p. 161–172.
3.
ASTM A29/A29M-6. Standard specification for general requirements for steel bars, carbon and alloy, hot- wrought. West Conshohocken (PA): ASTM International.
4.
ASTM E1019-11. Standard test methods for determination of carbon, sulfur, nitrogen, and oxygen in steel, iron, nickel, and cobalt alloys by various combustion and fusion techniques. West Conshohocken (PA): ASTM International.
5.
ASTM E1479-16. Standard practice for describing and specifying inductively coupled plasma atomic emission spectrometers. West Conshohocken (PA): ASTM International.
6.
ASTM F432-13. Standard specification for roof and rock bolts and accessories. West Conshohocken (PA): ASTM International.
7.
ASTM G3-14. Standard practice for conventions applicable to electrochemical measurements in corrosion testing. West Conshohocken (PA): ASTM International.
8.
ASTM G5-14. Standard reference test method for making potentiodynamic anodic polarization measurements. West Conshohocken (PA): ASTM International.
9.
ASTM G59-97. 2014. Standard test method for conducting potentiodynamic polarization resistance measurements. West Conshohocken (PA): ASTM International.
10.
AzizN, CraigP, MencikJ, HaiF.2013. Rock bolt corrosion – an experimental study. In: Proceedings of the coal operators conference. Wollongong: University of Wollongong ; p. 144 – 151.
11.
ChenH, RamandiHL, CraigP, CroskyA, SaydamS.2018. Analysis of premature failure of rock bolts and cable bolts failed in underground coal mines. In: Proceedings of the Fourth Australasian Ground Control in Mining Conference. Publication Series No 5/2018. Sydney: The Australasian Institute of Mining and Metallurgy, p. 407–413.
12.
CraigP, SaydanS, HaganP, HebblewhiteB, VandermaatD, CroskyA, EliasE.2016. Investigations into the corrosive environments contributing to premature failure of Australian coal mine rock bolts. Int J Min Sci Technol. 26 (1): 59 – 64.
13.
DorionJF, HadjigeorgiouJ.2014. Corrosion considerations in design and operation of rock support systems. Min Technol. 123 (2): 59 – 68.
14.
HadjigeorgiouJ, DorionJF, GhaliE.2008. Support system performance under different corrosion conditions. J. South Afr Inst Min Metall. 108: 359 – 365.
15.
HadjigeorgiouJ, SavguiraY, ThorpeSJ.2020. Impact of steel properties on the corrosion of expandable rock bolts. Rock Mech Rock Eng. 53: 705 – 721.
16.
HassellRC, VillaescusaE, ThompsonAG, KinsellaB.2004. Corrosion assessment of ground support systems. In: VillaescusaE., PotvinY., editors. Proceedings fifth international symposium on ground support, ground support in mining and underground construction. Rotterdam: Balkema ; p. 529 – 544.
17.
KimMJ, KimJG.2015. Effect of manganese on the corrosion behavior of low carbon steel in 10 wt. % sulfuric acid. Int J Electrochem Sci10: 6872 – 6885.
18.
LiC, StjernG, MyrvangA.2014. A review on the performance of conventional and energy-absorbing rockbolts. J Rock Mech Geotech Eng. 6: 315 – 327.
19.
LiP, TanTC, LeeJY.1996. Impedance spectra of the anodic dissolution of mild steel in sulfuric acid. Corr Sci. 38 (11): 1935 – 1955.
20.
Mercier-LangevinF.2019. Ground support: a mine manager's perspective. In: HadjigeorgiouJ, HudymaM, editors. Proceedings of the Ninth International Symposium on Ground Support in Mining and Underground Construction, Perth. Sudbury: Australian Centre for Geomechanics ; p. 29 – 40.
21.
NabhaniF, JasimAM, GrahamSW.2007. Electrochemical behaviour of low carbon steel in aqueous solutions. In: Proceedings of the World Congress on Engineering 2007, Vol II WCE 2007, 2007 July 2–4, London.
22.
NicholsonL, HadjigeorgiouJ.2018. Interpreting the results of in situ pull tests on friction rock stabilizers (FRS). Min Technol. 127 (1): 12 – 25.
23.
ScottJ.1977. U.S. Patent No. 3,922,867. Washington (DC): U.S. Patent and Trademark Office.
24.
ScottJ.1980. A new innovation in rock support – friction rock stabilizers. CIM Bull. 73: 65 – 69.
25.
SternM, GeabyAL.1957. Electrochemical polarisation: a theoretical analysis of polarization curves. J Electrochem Soc. 104 (1): 56 – 63.
26.
SundholmS.1987. The quality control of rock bolts. In: Proceedings Sixth International Congress on Rock Mechanics, Montreal, Canada, p. 1255 – 1264.
27.
WuS, NorthoverM, CraigP, CanbulatI, HaganPC, SaydamS.2017. Environmental influence on mesh corrosion in underground coal mines. Int J Min Reclam Environ. 32 (8): 1 – 17.
