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Indexed by:期刊论文

Date of Publication:2015-04-01

Journal:OPTICS AND LASER TECHNOLOGY

Included Journals:SCIE、EI

Volume:67

Page Number:137-142

ISSN No.:0030-3992

Key Words:Corrosion monitoring; Rock bolt; Low-coherent fiber-optic sensor

Abstract:Corrosion of rock bolts is a major cause for deterioration of the anchor-reinforced concrete slopes structures. In order to evaluate this corrosion-based deterioration in an early stage, a nondestructive technique was required. However, until now, there are no commercialized solutions that are straight-forwardly available. Here, a low-coherent fiber-optic sensing technique was developed. This method can carry out the monitoring of the corrosion-caused expansion at the accuracy of sub-microstrains by circled the sensing optical fiber in two ways. One was wound the fiber on the surface of steel rock bolt directly, and thereby generated a nonuniformity in the interface of cement with rock bolt. The other was circled the fiber on a cement mortar cushion without destroying the interface any way. The sensing fiber was configured as one arm of the fiber-optic Michelson interferometer. The acceleration corrosion experiments demonstrated that a uniform interface between cement and rock bolt determined the progress of corrosion development. An early stage evaluation of the corrosion development in rock bolts was monitored. (C) 2014 Elsevier Ltd. All rights reserved.