Structural strengthening

Pathologies encountered by our clients

01. Incorrect design or construction

Lack of concrete cover to protect rebars, lack of reinforcing bars, insufficient cross section, etc

02. Ageing of the structure or external aggression

Concrete carbonation, concrete chloride contamination, masonry deterioration, etc

03. Severe damage caused by accidental events

Damage to the concrete surface due to hydrocarbon fires, impacts, hydraulic abrasion, etc.

04. Increase in service loads

When the level of service loads is increased, dry-sprayed concrete can be used to strengthen the structure by increasing the reinforced concrete sections.

Advantages of dry shotcrete

This strengthening technique is implemented by transporting a dry mix of cement and aggregate through a pipe at high speed using compressed air, then adding water to the nozzle and spraying it onto a given surface.
With over 100 years of history, dry shotcrete is a proven technology that is considered one of the most effective techniques for structural repairs and reinforcement work, when implemented by specialists.
The technology is now covered by multiple standards: American Concrete Institute (ACI) and ASTM standards, European standards and EFNARC European association, UK Spray Concrete Association (SCA), Concrete Institute of Australia, etc.

The performance and reliability of this reinforcement solution is such that designers now consider the reinforced structure as monolithic and can therefore calculate it using the codes applicable to new constructions.

The technique allows very strong adhesion of the new concrete to the existing concrete or masonry substrate.

Depending on the application, the strength of the concrete is adjusted between 20 and 60 MPa compressive strength on the cores.

The concrete mix design is selected, or revised if necessary, to meet the requirements of the intended application: atmospheric bridges, underground tunnels, marine port infrastructure, etc.

Long conveying lengths, both horizontally and vertically, allowing for long distances between the nozzles and the spraying equipment.

Beams, columns and floor slabs, arches, vaults, precast elements, circular structures, etc.

One-stop specialist services

From structural analysis to implementation

to implementation

Dry shotcrete: a wide range of applications

Buildings

Smaller aggregates and finishing work make it possible to achieve a very smooth surface, even with dry sprayed concrete, which is then painted.
  • Smooth surface
  • Similar strength to
    the parent concrete
  • Similar modulus of elasticity
    than the parent concrete

Bridges

Dry spraying produces a very strong concrete that adheres strongly to the existing structure, making it an ideal technique for strengthening bridges.
  • High compressive strength
  • High E-modulus value
  • High adhesion

Railway tunnels

Concrete with guaranteed early strength can be sprayed dry when the structure is to be re-commissioned a few hours after application; the setting process of the concrete can be accelerated by using stiffening admixtures.
  • Fast return to service
  • Vibration resistant

Marine structures

When the surface of the concrete is exposed to sea water, the concrete is formulated to improve its properties against water absorption and chloride penetration.
  • Steel reinforcing bars protected from corrosion
  • Reduced water absorption of the concrete cover

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Documentation

Find out more in our case studies

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