This homeowner had a steel support column in the center of their garage. This column had begun to rust at the bottom, further causing the concrete around its base to degrade.
 

When steel components within concrete rust, they expand, exerting pressure on the surrounding concrete. This expansion may lead to the development of cracks in the concrete. Additionally, rust can weaken the bond between the steel and the surrounding concrete, further compromising the structural integrity.

If left unchecked, these cracks can propagate and worsen, potentially leading to structural issues and further deterioration.

 

 
Therefore, addressing rusting steel promptly is crucial to prevent damage to concrete structures.
 

This homeowner wisely sought out the guidance of AO Engineers. AO provided precise specifications, which we meticulously carried out to address the homeowner’s concerns.

First and foremost, we installed shoring on the support beam in the garage and removed the old column. Then we got to work preparing for the installation of a new footing. This footing would ensure optimal support for a new 4-inch adjustable steel column.

Once the steel column was securely in place, we turned our attention to the rest of the garage slab. To ensure a stable foundation, we excavated 6 inches of sub-base, replacing it with freshly compacted gravel. The concrete floor was poured to our standard thickness of 5 inches, as always using fiber-reinforced class-C concrete for added durability. Following the pour, we applied a steel trowel finish, followed by a sealing and curing process to enhance the floor’s longevity.

Do you see any signs of rust or is your concrete cracking or spalling in an area where embedded steel (rebar) might be? If so, please feel free to contact us or one of our preferred structural engineers for more guidance.