The left side of the photo is untouched. The right side has been "dentaled", a process that removes decayed concrete so that the repair product has a good foundation.
Repair of Concrete Column
The "dentaling" of the column is seen on the left hand side as the repair specialist moves from the left to the right.
Repair of the concrete works was done from the inside and outside of the building all the way up to the 13th floor.
Once the bad concrete is removed, the rebar is inspected. If the rebar is bad, it is cut out and a new piece is spliced in. If the rebar is still up to code, it is painted with an expoxy to prevent rusting.
Installation of the Repair Mortar
After the rebar is painted, the repair mortar is placed in layers. Repair mortar is specifically built to be non-shrink and it needs to be placed in layers to properly dry.
Final Layer of Concrete Repair Material
The final layer of the repair material is brought to a rough finish as it would later be covered up by the interior finishes.
Re-pour of Damaged Areas
If sections of damage are large enough, they can be re-poured with regular concrete. This can be a cheaper option than applying a repair mortar.
Virginia Class A Contractor License for Commercial Building Contractor (CBC) (License #: 2705163603)