A new two-staged model to predict corrosion degree of steel bars in cracked concrete area

Abstract

In order to quantitatively describe the local corrosion process of steel bars in cracked concrete area, a new two-staged utility model is established, and the effect of transverse cracks on the reinforcement corrosion is analyzed from the angle of long-term service performance evaluation for reinforced concrete structure. Moreover, based on the principle of spectral analysis for environmental action of concrete, an equivalent relationship is established between the corrosion rate in the natural environment and that under the standard temperature and relative humidity condition according to the principle of equivalent annual corrosion depth. Comparison between the inspection results from some references and the calculated values by the two-staged utility model validates the feasibility of the proposed model. The model was applied to Chinese Railway Track System (CRTS)II ballastless track slab with transverse dummy joints, from which satisfactory results of corrosion degree of steel bars were obtained.

Keywords

local corrosion / corrosion rate / corrosion depth / service performance

References

[1] Hu Xiaoxu Influence of the Reinforcement Rusting with Cracks on Reinforced Concrete Construction[J]. Liaoning Communication Technology, 2004 33-35.

[2] Cao C, M S Cheung M, Y B B Modelling of Interaction between Corrosion-Induced Concrete Cover Crack and Steel Corrosion Rate[J]. Corrosion Science, 2013, 69: 97-109.

[3] Subramaniam K V, Bi M Investigation of Steel Corrosion in Cracked Concrete: Evaluation of Macrocell and Microcell Rates using Tafel Polarization Response[J]. Corrosion Science, 2010, 52(8): 2 725-2 735.

[4] Blagojevic A F, SAAM Walraven J C Impact of Cracks on Chloride-Induced Corrosion and Durability of Reinforced Concrete Structures-A Literature Review[C]. International PHD Student Workshop on Durability of Reinforced Concrete, 2012

[5] Sahmaran MY, Özgür I Influence of Transverse Crack Width on Reinforcement Corrosion Initiation and Propagation in Mortar Beams[J]. Canadian Journal of Civil Engineering, 2008, 35(3): 236-245.

[6] Geng Ou Reinforcement Corrosion and Degradation Rate of Concrete Members[M], 2010 Beijing China Railway Publishing House

[7] Jiang D, Li G, Yuan Yingshu Experimental Studies of the Effect to the Corrosion Rate of Rebar for Transverse Cracks in Concrete[J]. Sichuan Building Science, 2005, 31(4): 55-58.

[8] Schiessl P R Michael. Laboratory Studies and Calculations on the Influence of Crack Width on Chloride-Induced Corrosion of Steel in Concrete[J]. ACI Materials Journal, 1997, 94(1): 56-61.

[9] Darwin D M D G Hognestad E B, A W. Debate: Crack Width, Cover, and Corrosion[J]. Concrete International, 1985, 7(5): 20-35.

[10] Hartt W H, Powers R G Corrosion Resistant Alloys for Reinforced Concrete[R], 2007 Washington, DC Federal Highway Administration

[11] Chang L, Cheng Zenghe The Effect on Steel Bar Corrosion Produced by Concrete Cracks[J]. Industrial Construction, 2006, 36(S): 903-916.

[12] Liu X, Wei Jun Spectral Analysis Approach of Environmental Actions on Concrete Structures[C]. The 4th International Symposium on Lifetime Engineering of Civil Infrastructure, Beijing, 2009

[13] Xu G, Wei Jun Modelling Bond Strength of Corroded Plain Bar Reinforcement in Concrete[J]. Structural Concrete, 2007, 8(3): 133-138.

[14] Sun Y, Hu Jin Corrosion and Corrosion Control of Metal[M], 2010 Harbin Harbin Institute of Technology Press

[15] Yuan Liqun The Investigation and Analysis of Corroded and Cracked Reinforced Concrete[D], 2007 Xi’an Xi’an University of Architecture and Technology

[16] Xi’an University of ArchitectureTechnology. Standard for Durability Assessment of Concrete Structures[S], 2007

[17] Bogl Company of German. Calculation and Design Report about the Track Slab of Tianjing Training Materials [R], 2005