Concrete repairing by patching and injection

What causes damage to concrete?.

Corrosion of reinforcing steel creates enough pressure to crack concrete. Steel rebar is protected inside concrete because the concrete is very alkaline which prevents rust. But if there are chloride ions present, such as from deicing salts, the chloride destroys the "passivating layer" of alkalinity around the steel, allowing it to rust. Rust has greater volume than steel and the expansion presses against the concrete putting it in tension and causing it to crack and pop off.

Alkali-aggregate reaction destroys concrete from the inside and cracks from structural loads.

Physical damage : can occur during the casting and de-shuttering processes. For instance, the corners of beams can be damaged during the removal of shuttering because they are less effectively compacted by means of vibration (improved by using form-vibrators). Other physical damage can be caused by the use of steel shuttering without base plates. The steel shuttering pinches the top surface of a concrete slab due to the weight of the next slab being constructed.

Blisters / delamination, bubbled concrete surfaces may be blisters caused by prematurely finishing and sealing the concrete surface and sealing in air and bleed water. This can especially be a problem with air entrained concrete and heavy finishing equipment.

Cracks from water leakage and Chemical damage from Carbonation , Chlorides, Sulfates or Sea water.

Products for concrete repairing that we made such as Polyurethane Injection Line :

• Waterproofing, Injection Crack Repair & Sealing
• Injection Foams & Resins
• Epoxy Injection Line
• PU and Silicone Sealants