Repair Spalling Concrete Wall

The correct concrete mix can also help prevent spalling.

Repair spalling concrete wall.

Remove the concrete at the spalled areas to expose the corroded steel bars. For new concrete apply a penetrating waterproofing sealer 28 days after concrete placement and every few years thereafter. Ensure the concrete has adequate control joints in its structure so cracks can be controlled and spalling will be more difficult to start. Portland cement water sand and gravel or crushed rock.

Sealing is the best way to prevent moisture related spalling. Mist the wall with water and then apply a coat of thoroseal with a latex additive check on amazon. Apply two coats of anti rust paint to the steel bars. The visible damage on the vertical face of footing walls is called spalling which creates holes and chips.

The steel reinforcing bars within the concrete begin to corrode and expand causing the breakage on the surface concrete. Concrete is made with four basic ingredients. If caught early spalling can be repaired removing the need for complete concrete replacement. This of course should only be done after making repairs to the damaged part of your walls with concrete check on amazon.

Think of this as just applying stucco to the concrete. Apply sealant to keep water from entering the concrete and reapply the sealant as often as needed every few years or even every year to keep it effective. When the spalling damage is shallower than 1 3 of the concrete s thickness the concrete usually can receive a surface repair. Deeply spalled concrete can be repaired with a concrete overlay.

Over the course of a winter or over the course of years as the internal pressure rises and falls it stresses the surface layer of the concrete which leads to spalling. Scrape and clean the exposed steel bars and use a wire brush to remove the rust. Repair of spalled concrete slab. Spalling is generally caused by carbonation of the concrete where carbon dioxide reacts to chemicals within the concrete.

Corroded rebar due to exposure must be cleaned at the beginning of the restoration process. Air entrainment is particularly effective in providing resistance to freeze thaw cycles. If the damage is greater than 1 3 of the depth steel bars may need to be installed and a full depth restoration may be required.