Use of Vibrating Wire Strain Gauges to Monitor Corrosion-Induced Deterioration of Concrete

Abstract:

Steel reinforcement corrosion is always one of the most significant incentives of concrete structure deterioration, especially under severe chloride erosion environment. In order to describe the whole process of concrete deterioration induced by reinforcement corrosion, the mechanism of rust expansion and crack propagation in concrete was analyzed from the perspective of elastoplastic mechanics and fracture mechanics firstly, and experimental study was carried out to use vibrating wire strain gauges for monitoring corrosion-induced concrete deterioration process. The mechanism analysis of corrosion-induced concrete deterioration indicates that the degradation process of cover concrete can be divided into aggressive medium transmission process, free corrosive expansion process, corrosive expansion stress development process, corrosive expansion crack generation and propagation process, and vibrating wire strain gauges can be used to monitor corrosion-induced cover concrete stress development, crack initiation and propagation process along with the procedure of reinforcement corrosion. The test curve seems to be generally consistent with that of the theoretic analysis, and the signals captured by vibrating wire strain gauges can successfully reflect the durability degradation process of reinforced concrete structure under severe erosion environment.

• Periodical: Key Engineering Materials (Volume 517)
• Pages: 357-362
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.517.357
• Online since: June 2012
• Authors: Xiao Chun Liu, Jun Wei, Zhen Yu Wang
• Keywords: Concrete Structure, Corrosive Expansion, Crack, Durability, Monitoring, Strain

References

[1] P. Metha, Durability of concrete-fifty years of progress? , in: Detroit: American Concrete International, (1991) 1-32.

[2] H. W. Song, V. Saraswathy, Corrosion Monitoring of Reinforced Concrete Structures-A Review, Int. J. Electrochem. Sci. 2(2007)1-28.

[3] H. L. Wang, W.L. Jin, X.Y. Sun, Fracture model for protective layer cracking of reinforced concrete structure due to rebar corrosion, Journal of Hydraulic Engineering, 39(7) (2008) 863-869. (in Chinese).

[4] Q.F. LI, G.D. ZHOU, L.L. ZHAO, Analysis for Critical Rust Expansion Force of Reinforced Concrete Based on the Elastic-plastic Mechanics and Fracture Mechanics, Building Science, 26(11) (2010) 21-24. (in Chinese).

[5] X.L. Wang, J.J. Zheng, Z.M. Wu, Fracture Predicting Model for the Critical Expansion Force of Reinforced , Water Power, 33(2) (2007) 49-52. (in Chinese).

[6] D. Dugdale, Yielding of steel containing slits, J. Mech. Phys. Solids. 8(8) (1960) 100–108.

[7] S. Mohammadi, Extended Finite Element Method, John Wiley & Sons, Chichester, England, (2008).

[8] Chinese Aeronautic Establishment, Handbook of Stress Intensity Factors, revised ed., Science Press, Beijing, 1993. (in Chinese).