REACTIVE REPAIR STRATEGIES FOR CONCRETE CRACKS IN CONCRETE AS A RESULT OF CORROSION IN REINFORCEMENT (SPALLING)

Once concrete begins to show signs of defects and/or surface damage, the structural integrity is already compromised. Reactive repairs are shown as Stages 2-4 on Figure 1.1. A coating or corrosion inhibitor would be insufficient until the concrete is repaired. Depending on what stage of deterioration has taken place will directly coincide with what repair method will be required.

PATCH REPAIRS
Patch repairs all follow the same basic activities. The goal is to clean the reinforcing steel to prevent future damage.
To gain access to the reinforcing steel, mechanical means are used to remove the concrete cover which can include pneumatic hammers, hydro jetting or milling. All of the cracked and delaminated concrete must be removed to fully expose the corroded reinforcement.

The corroded steel is then cleaned by sandblasting or wire brush and an application of a protective anti-corrosion coating to the steel is applied. At areas where the reinforcing bar has corroded beyond 20% of the original size, additional bar shall be spliced in to guarantee structural integrity.

Once all of the reinforcing steel has been cleaned and protected an application of repair mortar is applied to replace the damaged concrete.

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