Experimental Evaluation of Corrosion Effect on Bond Between Steel and Concrete in Presence of Cyclic Action

Author:

Giordano Luca1,Mancini Giuseppe1,Tondolo Francesco1

Affiliation:

1. Politecnico di Torino

Abstract

Corrosion modifies the steel-concrete interface in reinforced concrete structures. The efficiency of the connection between the two materials is reduced and the structural behavior both in service and in ultimate condition is affected. Moreover in structures subjected to cyclic load, a simultaneous mechanical deterioration due to the load is present. In this work an experimental analysis on reinforced concrete structures under both cyclic load and corrosion of reinforcing bars is presented. Three couples of reinforced concrete ties are connected in series and subjected to the same stress variation in order to produce the cracking conditions and to activate the bond mechanism. However, while one of the two reinforced concrete ties is only subjected to cyclic load, the second one is also corroded using an accelerated electrochemical corrosion process. The simultaneous effect of the cyclic load and corrosion is evaluated monitoring the crack opening on the structures during the test and by means of visual inspection of the sample. The test results show the correlation between the mechanism of bond and the average level of stresses for an amplified stress range.

Publisher

Trans Tech Publications, Ltd.

Subject

Mechanical Engineering,Mechanics of Materials,General Materials Science

Reference6 articles.

1. Fib Bulletin n°10, 2001. Bond of reinforcement in concrete. Lausanne (CH), Switzerland.

2. Rodriguez, J., Ortega, L. M., Garcia, A. M., 1994. Assessment of structural elements with corroded reinforcement. International Conference on Corrosion and Protection of Steel in Concrete. Sheffield, UK, July, 171-185.

3. Rodriguez, J., Ortega, L., Izquierdo, D., Andrade, C. 2006. Calculation of structural degradation due to corrosion of reinforcements. ECF 16, Alexandroupolis, Greece, 3-7 July, 527-536.

4. Giordano, L., Mancini, G., Tondolo, F., 2009. Experimental analysis of reinforced concrete ties under simultaneous mechanical and chemical actions. Concrete: 21st Century Superhero. London. Submitted.

5. EN 1991-2, 2005. Actions on structures - Traffic loads on bridges.

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