Structural concrete rapairs

The passage of time and adverse weather conditions degrade concrete, making it lose its alkalinity due to carbonation thereof with atmospheric air (CO2), leaving its framework unprotected, which becomes oxidized and increases in volume, whereupon it breaks and becomes detached.

Likewise, concrete surfaces suffer significant mechanical aggressions produced by impacts and blows.

To avoid future pathologies, wear and for aesthetic reasons, proper maintenance and repair of the concrete is required.

Preliminary analysis

The structural repair of concrete requires a mortar compatible therewith and that ensures its durability. For this reason, it should have:

  • High mechanical resistance
  • Great adherence to the concrete substrate
  • Resistance to carbonation and atmospheric attacks
  • Thixotropic and compacted

Technical considerations

The first consideration to be taken into account is the state of the substrate:

  • The old concrete substrate must be cleaned and chipped away, forming straight edges, to remove soft and non-adherent parts.
  • Next, moisten the substrate and apply GECOL Reparatec R4 structural mortar.
  • Lastly, let set and apply a floated finish.

If the framework is oxidized, clean and completely descale the oxidized part until the non-oxidized metal is exposed.

The oxide is removed by mechanical methods and then a GECOL Pasivador anti-rust primer is applied.

For a more waterproof finish, it is recommended to apply a coat of GECOL Imper, to ensure the total impermeability of the concrete.

Recommended products

Concrete repairers



Structural-fast setting


Fast setting

Thin layer 3 mm Elastic

Thin layer from 2 to 5 mm


Polymeric binder

Warnings: The data provided by this Constructive Solution were prepared based on standard onsite installation processes. However, we recommend that you consult our Technical Department in the event of any specific circumstance