Corrosion properties of ASTM A615 rock bolt steel in US underground coal mines

Abstract

Corrosion of rock bolts is a relatively slow process yet a potential problem for the underground mining industry. Mine groundwater in the strata through natural or mining-induced cracks together with the humid environment in the mine openings interact with the roof support systems often resulting in corrosion. Electrochemical studies of the commonly used rock bolt steel in the coal mining environments will lead to a better understanding of the material's performance and their ability to resist corrosion. The influence of pH, solution resistivity, total dissolved solids, and aggressive ions on the electrochemical properties of rock bolt steel are discussed. This preliminary study focuses on understanding the corrosion potential, polarization resistance, and corrosion rates of the rock bolt steel that is most commonly used in US underground coal mines. Based on the findings, it was observed that the polarization resistance (Rp) is inversely proportional to the corrosion rate (CR) over time.

Stress corrosion testing of roof bolt grade 60 steel in simulated underground coal mine atmosphere

“…Several preliminary findings on rock bolt corrosion in U.S. mines have been published by Spearing and his research group at SIUC (Bylapudi 2010; Spearing et al. 2010c, 2010a, 2010b; Pile 2012; Spearing et al.…”

“…Several preliminary findings on rock bolt corrosion in U.S. mines have been published by Spearing and his research group at SIUC (Bylapudi 2010;Spearing et al 2010cSpearing et al , 2010aSpearing et al , 2010bPile 2012;Spearing et al 2013;Bylapudi et al 2015). One of the significant problems with rock bolt corrosion is the stresses they undergo in the respective environment (Bylapudi et al 2015).…”

Comparative Test on the Bond Damage of Steel and GFRP Bars Reinforcing Soft Rock Slopes

“…The aim of this test is to adopt bolt reinforcement which can last more than one hundred years. The durability of the anchorage system is affected by groundwater, fluctuating temperature, and other environmental factors when the traditional steel bar is used to reinforce the slope, coal mine and other projects [1][2][3][4][5][6]. Compared with the traditional steel bars, the new Glass Fibre Reinforced Polymer (GFRP) bar has the advantages of high strength, light weight, low modulus, and corrosion resistance [7][8][9] and can be used to solve the durability problem of anchorage structures.…”