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.

  • Applications
    Bridges
    Buildings
    Industrial facilities
    Tunnels & culverts
    Port & Waterway structures
    Water infrastructures

Pathologies encountered by our clients

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

Concrete carbonation, concrete chloride contamination, masonry deterioration, etc

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

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

Structural strengthening

Why choose the dry shotcrete technique for your project?

01. Very high adhesion

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

02. Very high strength

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

03. Almost no formwork required

04. Long conveying lengths

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

05. Applicable to all types of structural elements

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

06. Formulation according to the application

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.

07. The result is considered monolithic

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.

08. 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.
A turnkey service

From structural analysis to implementation

Structural analysis:
we help solve your problems

Before repairing or reinforcing, the condition of the structure and its load-bearing capacity must be assessed. Freyssinet can help with the diagnosis: visual inspection, destructive and non-destructive testing, stress analysis, etc.

Engineering solution:
the right solution at the right place

We assist you in developing a repair strategy or in checking its feasibility. Our engineers analyse the project specifications, draw up plans and calculation notes. They select the appropriate equipment and define the production programme.

Guaranteed results at execution:
a complete control of the implementation

The composition of the dry mix, the power of the equipment and the skills of the nozzlemen are essential to deliver a quality job. The Foreva Shotcrete solution is applied by our experienced nozzlemen, certified in-house under a dedicated quality charter.

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

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

Download our brochure

Documentation
Documentation

Find out more in our case studies

Repair
UK

Channel Tunnel concrete repairs

Mobilisation on a momentous scale paved the way to an early finish on the extensive concrete repairs needed to put the Channel Tunnel back into operation after a devastating fire.
Discover more
Repair
Jordan

Clemenceau Medical Center rehabilitation

Building rehabilitation project to turn a high-rise hotel building into a hospital facility, that needed extensive strengthening works to accommodate the revised loads.
Discover more
Repair
Morocco

Hjar Ennhal bridge structural strengthening

As part of its asset management strategy, the Moroccan National Railways Office launched a programme to restore several engineered structures along the railway line between Tangiers and Sidi Kacem. Structural strengthening of the Hjar Ennhal bridge was a true challenge.
Discover more
Repair
Vietnam

Y Bridge widening and strengthening in Vietnam

Planned widening works to an 80-year old bridge in the congested urban setting of Ho Chi Minh city centre had to be reconsidered after thorough analysis revealed the structure’s true condition.
Discover more

Discover our solutions per type of structure

Repair

Bridges
Repair

Buildings
Repair

Heritage structures
Repair

Industrial facilities
Repair

Port and waterway structures
Repair

Tunnels and culverts
Repair

Water infrastructures
Repair

Bridges
Repair

Buildings
Repair

Heritage structures
Repair

Industrial facilities
Repair

Port and waterway structures
Repair

Tunnels and culverts
Repair

Water infrastructures

You have a project?

Our local experts will help you achieve your project thanks to our large range of solutions.
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You have a project?

Our local experts will help you achieve your project thanks to our large range of solutions.
Find us

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