Description
Dry Spray Concrete Repair Mortar
Fosroc Renderoc DS is a polymer modified, fibre reinforced, dry spray concrete repair mortar designed for structural and non-structural concrete repairs. Conforming to BS EN 1504-3 Class R4 requirements, it delivers high strength, excellent bond performance and outstanding durability for repairs to buildings, bridges, tunnels, marine structures and other reinforced concrete assets.
Formulated with Portland cement, graded aggregates, silica fume, polymer modifiers and specialist additives, Renderoc DS provides low rebound characteristics, excellent handling properties and long-term protection against carbonation, chloride ingress and aggressive environments. It can be applied in substantial thicknesses using the dry spray process, making it ideal for both localised repairs and large-area concrete refurbishment projects.
Key Features & Benefits
- Polymer modified fibre reinforced repair mortar
- Dry spray application system
- BS EN 1504-3 Class R4 compliant
- Low rebound formulation
- High early and ultimate strength
- Excellent bond to concrete
- High resistance to carbon dioxide penetration
- Excellent durability in aggressive environments
- Suitable for structural concrete repairs
- Suitable for large-area overlays
- Can increase concrete cover to reinforcement
- Can be applied from 3°C and above
- Class A1 non-combustible
- Low shrinkage formulation
- Excellent freeze-thaw resistance
Suitable Applications
- Concrete building repairs
- Bridge repairs
- Tunnel repairs
- Marine structure repairs
- Culvert repairs
- Beam repairs
- Column repairs
- Concrete panel repairs
- Reinforced concrete restoration
- Structural concrete repairs
- Concrete cover enhancement
- Large-area concrete overlays
- Infrastructure refurbishment
- Highway repair projects
Technical Information
- Product Type: Dry spray concrete repair mortar
- Classification: BS EN 1504-3 Class R4
- Application Method: Dry spray process
- Minimum Application Thickness: 10mm
- Maximum Vertical Build: 150mm
- Maximum Overhead Build: 90mm
- Fresh Wet Density: Approx. 2200 kg/m³
- Fire Rating: Class A1 Non-Combustible
- Coverage: Approx. 12.5 litres per 25kg bag
- Packaging: 25kg bags, 500kg sacks, 1000kg sacks
Performance Data
Compressive Strength
- 1 Day: 20 MPa
- 7 Days: 45 MPa
- 28 Days: 60 MPa
Bond Strength
- Pull-Off Adhesion: 2.7 MPa
Elastic Modulus
- 28.6 GPa at 28 Days
Setting Time
- Initial Set: 3.5 Hours
- Final Set: 5 Hours
Frequently Asked Questions
What is Fosroc Renderoc DS used for?
Renderoc DS is used for structural and non-structural concrete repairs on bridges, buildings, tunnels, marine structures, beams, columns and concrete panels.
What application method is required?
The product is designed specifically for application using the dry spray concrete repair process by trained applicators.
How thick can Renderoc DS be applied?
It can be applied up to 150mm vertically and 90mm overhead in a single application. Greater thicknesses can be achieved through multiple applications.
Is Renderoc DS suitable for structural repairs?
Yes. It conforms to BS EN 1504-3 Class R4, making it suitable for structural concrete repair applications.
What compressive strength does it achieve?
The mortar achieves 60 MPa compressive strength at 28 days.
Can it be used in cold weather?
Application may proceed at 3°C and rising, but should not be applied at 3°C and falling.
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