Corrosion in Reinforced Concete Repair

asim99 · (This post was last modified: 12-01-2012, 02:06 AM by asim99.)

Lack of a scientific design approach for repair and rehabilitation of corroding
reinforced concrete infrastructure has resulted in significant financial and social costs.
This experimental program was primarily undertaken to examine the corrosion process in
reinforced concrete repair, which has different characteristics as compared with corrosion
in new construction. The program was designed to gain a deeper understanding of how
certain restoration strategies may lead to problems of electrochemical incompatibility and
result in ineffective corrosion mitigation.
Fifteen specimens, 1m by 1m by 0.2m, were cast to represent a section of a
deteriorating reinforced concrete bridge deck slab. The central portion was uniquely
designed to simulate the deterioration caused by corrosion activity in a bridge deck slab.
After initiating corrosion using wetting and drying cycles with 15 %salt solution, each
specimen was subjected to a unique restoration strategy. The wetting and drying cycles
continued, and a monitoring program was established to observe the corrosion activity of
each specimen.
The results corroborate current research, that patch repairs can trigger the
formation of a macrocell corrosion cell, or a ring of active corrosion surrounding the
repaired zone. In addition, the results from the electrochemical testing revealed sharp
differences in the corrosion behaviour of the different restoration strategies. However, the
physical evidence of minimal corrosion for all four specimens that were demolished at
the end of the testing period, reveals a discrepancy with the electrochemical testing
results.

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