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Icon of a trowel repairing cracked reinforced concrete, with a stopwatch showing the 30 minute set time of FASTSET R4 (30)

Powder Solutions Concrete Repair

FASTSET R4 (30)

FASTSET R4 (30) is a polymer modified, cementitious repair compound that meets the requirements for Class R4 EN 1504-3 high strength and high build repair mortars. It sets within 20 to 30 minutes, depending on temperature, with extremely high early strengths.

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Form
Powder
Category
Concrete Repair
Manufacturer
UKCP

Key Benefits

  • Rapid set times, approximately 20 minutes at 20°C
  • Extremely high early strengths
  • Low shrinkage
  • High bond strength
  • Non-corrosive, compatible for use with steel reinforcement
  • Polymer modified

Typical Applications

  • Rapid repair of damaged surfaces in precast concrete
  • Repair of in-situ concrete
  • Filling surface voids and blowholes
  • Concrete pipe spigots and sockets
  • Damaged concrete floors and steps
  • High strength and high build repairs

What is FASTSET R4 (30)?

FASTSET R4 (30) is a polymer modified, cementitious repair compound for concrete repair. It meets the requirements for Class R4 EN 1504-3 high strength and high build repair mortars. EN 1504-3 is the European standard for concrete repair mortars, and R4 is its highest strength class.

It sets within 20 to 30 minutes, depending on temperature, to suit rapid repair of concrete structures. Special cements provide rapid set and extremely high early strengths, and powder polymers provide strong adhesion to the substrate along with improved surface hardness.

Where is FASTSET R4 (30) used?

FASTSET R4 (30) has been developed for precast applications where rapid repair to damaged surfaces is required. Mixed with water, it is applied to damaged areas and can be shaped and profiled to provide a seamless repair. Main application areas are the repair of in-situ and precast concrete, including:

  • Filling surface voids and blowholes
  • Concrete pipe spigots and sockets
  • Damaged concrete floors and steps

It is non-corrosive and compatible for use with steel reinforcement. For any repair involving exposed reinforcement, talk to our technical support team first.

How to use FASTSET R4 (30)

  1. Prepare the surface. Make sure it is sound, clean and free from laitance, loose materials, oil, grease and other surface contaminants. If necessary, hack the surface back to a sound substrate.
  2. Damp down. Wet the surface with clean water to reduce suction.
  3. Prime difficult substrates. For improved adhesion, brush on a slurry of water and FASTSET R4 (30) mixed at 1:4 by volume.
  4. Mix. In a clean container, add water to the powder in small quantities until the desired consistency is achieved. The typical water to powder ratio is 1:5 by weight.
  5. Apply and shape. Place the repair, then shape and profile it to match the surrounding concrete.

Do not mix more material than can be used within the setting time. The recommended minimum application temperature is 5°C, and the approximate yield is 5.10 litres per 10kg. Mix ratios are typical and vary with the application, so confirm them with trials and our technical team.

Health and safety

Refer to the FASTSET R4 (30) Safety Data Sheet, available on request, for full instructions. Wear suitable PPE, including gloves and goggles, when handling.

Packaging, storage and shelf life

FASTSET R4 (30) is supplied in 15kg paper sacks and 1000kg bulk bags. Avoid storing at temperatures below 5°C or above 30°C. When stored correctly, it has a shelf life of 12 months from date of manufacture.

Which FASTSET is right for the job?

Setting time Compressive strength at 28 days
FASTSET 1 5 to 10 minutes Above 25.0 N/mm²
FASTSET 30 20 to 30 minutes Above 25.0 N/mm²
FASTSET R4 (30) 20 to 30 minutes Above 45.0 N/mm²
FASTSET FS120 120 minutes Above 25.0 N/mm²

Need a high strength, high build repair? Talk to our technical support team, or request a sample of FASTSET R4 (30).

FASTSET R4 (30) FAQs

Common questions about FASTSET R4 (30). For project specific advice, contact our technical team.

What is FASTSET R4 (30)?
FASTSET R4 (30) is a polymer modified, cementitious repair compound. It meets the requirements for Class R4 EN 1504-3 high strength and high build repair mortars. Special cements provide rapid set and extremely high early strengths, and powder polymers give strong adhesion to the substrate along with improved surface hardness.

What does Class R4 mean?
EN 1504-3 is the European standard for structural and non-structural concrete repair products, and it groups repair mortars into classes R1 to R4. R4 is the highest class, with the most demanding strength requirements.

How long does FASTSET R4 (30) take to set?
FASTSET R4 (30) sets within 20 to 30 minutes, depending on temperature, and in approximately 20 minutes at 20°C. For a longer working time, FASTSET FS120 sets in around 2 hours. For the fastest set, FASTSET FS1 sets within 5 to 10 minutes.

What strength does FASTSET R4 (30) achieve?
Typical compressive strength at 28 days is above 45.0 N/mm² and adhesive bond strength is above 2.0 MPa. Results on site depend on preparation, mixing and curing, so confirm performance with trials and our technical team.

What is the mix ratio for FASTSET R4 (30)?
The typical water to powder ratio is 1:5 by weight, adjusted to suit the consistency your application needs. The approximate yield is 5.10 litres per 10kg. Confirm the mix with trials and ask our technical team if you need advice.

How is FASTSET R4 (30) supplied?
FASTSET R4 (30) is supplied in 15kg paper sacks and 1000kg bulk bags. Avoid storing below 5°C or above 30°C. Stored correctly, it has a shelf life of 12 months from date of manufacture.

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Guides and Insights

Further reading from the UKCP team, starting with guidance on FASTSET R4 (30).

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