Licence RBQ: 2521-4800-24 | Certifié ISO 9001:2008


The technique of shotcrete is frequently used to repair the underside of concrete slabs and vertical surfaces without using forms.

Qualified workers

Benefit from the expertise of Dumoulin & Associates: our applicators are certified by the American Concrete Institute (ACI).

Processes followed

We offer you two methods of shotcrete application:


  • The dry process: the most common way to undertake repairs. The dry ingredients are mixed directly, in a hose, with the water in the spray. A perforated ring in the hose allow the ingredients to mix.


  • The wet process: normally involves conventionally prepared concrete or mortar and requires a concrete pump and compressor.

Advantages of shotcrete

When the work is handled by competent workers with adequate know-how, shotcrete has many advantages:


  • Execution speed
  • Possibility to pause or stop the spraying at any moment (e.g.: in the case of the dry process, the ingredients only mix when they are in the spray)
  • Greater flexibility to reach areas difficult to access
  • Highly suitable for curved and irregular surfaces
  • Eliminates the need for complex forms
  • Excellent washout resistance
  • Very low permeability
  • Highly resistant to sulfate attacks

Shotcrete uses

  • Concrete structural repairs, such as bridges, viaducts, dams, reservoirs, train or metro tunnels, marine structures and multi-level parking garages
  • Repair and covering of sewer pipes, storm sewers and sanitary sewers
  • New constructions: slope stabilization, soil nailing, covering the walls of tunnels, pools and all other concrete constructions