Defining Concrete Repair: Parking/Plaza Slab Strengthening

The supported garage slab was a reinforced concrete flat plate, and the plaza slab was a reinforced concrete flat slab with drop panels. Shortly after construction was completed, the garage slab began to develop excessive cracking.

Contractors added supplemental drop panels and capitals to existing columns to better support the garage slab above. Self-consolidating concrete was pumped into formwork through port holes to complete the new column units.

The garage was closed to traffic and a contractor was hired to add additional thickness to the drop panels in certain locations and supplemental concrete column capitals underneath the garage slab where required. CFRP strips were also installed as additional flexural reinforcement. The contractor injected epoxy into the surface cracks and applied an elastomeric coating to prevent future damage from water and deicing salts.

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