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Rapid Setting Concrete Repair Compounds

UKCP FASTSET products are polymer modified, cementitious repair compounds for concrete. Choose FASTSET 1 (5 to 10 minutes), FASTSET 30 (20 to 30 minutes) or FASTSET FS120 (2 hours) for cosmetic repair, or FASTSET R4 (30), a Class R4 high strength, high build repair mortar.

View all 4 products Concrete Repair Datasheets
Weathered concrete landing with cracked, spalled and patched areas

At a glance

  • Set times from 5 minutes to 2 hours
  • Meet the requirements of EN 1504-3
  • Polymer modified for high bond strength
  • Non-corrosive to steel reinforcement

Concrete Repair Products

There are 4 products in this collection. Select a product for full details, technical data and its downloadable datasheet.

Icon of a trowel filling a crack in concrete, with a stopwatch showing the 5 to 10 minute set time of FASTSET 1

Powder Concrete Repair

FASTSET 1

FASTSET 1 (FASTSET FS1) is a polymer modified, cementitious repair compound for cosmetic concrete repair. It sets within 5 to 10 minutes, depending on temperature, to suit the rapid repair of concrete structures. It conforms to Class R3 of EN 1504-3.

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Icon of a trowel filling a crack in concrete, with a stopwatch showing the 30 minute set time of FASTSET 30

Powder Concrete Repair

FASTSET 30

FASTSET 30 (FASTSET FS30) is a polymer modified, cementitious repair compound for cosmetic concrete repair. It sets within 20 to 30 minutes, depending on temperature, giving more working time than FASTSET 1 while still allowing a rapid repair. It conforms to Class R3 of EN 1504-3.

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Icon of a trowel filling a crack in concrete, with a stopwatch showing the 2 hour set time of FASTSET FS120

Powder Concrete Repair

FASTSET FS120

FASTSET FS120 is a polymer modified, cementitious repair compound for cosmetic concrete repair. It sets in 2 hours at 20°C, giving time for larger quantities of repairs, followed by rapid strength gain. It conforms to Class R3 of EN 1504-3.

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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 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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Need the technical data?

Download the datasheets for all 4 concrete repair products, or request a sample to try on your next job.

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UKCP FASTSET products are polymer modified, cementitious repair compounds for concrete. They contain special cements for rapid set and high early strength, and powder polymers for strong adhesion to the substrate and improved surface hardness. FASTSET 1, 30 and FS120 conform to Class R3 of EN 1504-3, and FASTSET R4 (30) to Class R4.

What is in the concrete repair range?

  • FASTSET 1 (FASTSET FS1): sets in 5 to 10 minutes, depending on temperature.
  • FASTSET 30 (FASTSET FS30): sets in 20 to 30 minutes, depending on temperature.
  • FASTSET FS120: controlled 2 hour set for larger quantities of repairs.
  • FASTSET R4 (30): Class R4 high strength, high build repair mortar, sets in 20 to 30 minutes.

Which FASTSET should I use?

FASTSET 1 FASTSET 30 FASTSET FS120 FASTSET R4 (30)
Setting time 5 to 10 minutes 20 to 30 minutes About 2 hours 20 to 30 minutes
Compressive strength (28 days) Above 25 N/mm² Above 25 N/mm² Above 25 N/mm² Above 45 N/mm²
Classification (EN 1504-3) Class R3 Class R3 Class R3 Class R4
Supplied in 15kg paper sacks 15kg paper sacks 15kg paper sacks 15kg paper sacks and 1000kg bulk bags

The choice mostly comes down to working time. FASTSET 1 suits small repairs that need to be finished almost immediately. FASTSET 30 and FASTSET R4 (30) give time to build up edges and form profiles. FASTSET FS120 lets you mix a larger batch and carry out more repairs before it sets.

What can FASTSET be used for?

FASTSET has been developed for precast applications and for repair of in-situ and precast concrete, including:

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

For structural repairs or any repair involving exposed reinforcement, please speak to our technical support team first.

How do you carry out a rapid concrete repair?

  1. Make sure the surface is sound, clean and free from laitance, loose material, oil and grease. Hack back to a sound substrate if necessary.
  2. Damp down the surface with clean water to reduce suction. On difficult substrates, brush on a slurry of water and FASTSET at 1:4 by volume.
  3. Mix FASTSET in a clean container, typically 1 part water to 5 parts powder by weight, adding the water in small quantities until you reach the consistency you need.
  4. Mix only as much as you can use within the setting time, then apply, shape and profile the repair.

A 10kg pack yields approximately 5.10 litres. Wear gloves and goggles when handling cementitious products. Our guide to carrying out a rapid cosmetic concrete repair with FASTSET covers the method in more detail.

Why choose UKCP for concrete repair?

UK Construction Products formulates, manufactures and distributes specialist construction products, with over 30 years' technical experience developing additives and admixtures for dry mortars, silo mortars and concrete applications. Our in-house team can advise on repair methods, and we can develop bespoke formulations for manufacturers who need rapid set accelerators, retarders or other additives tailored to their production.

For pack sizes and delivery, contact us, or request a sample to try FASTSET for yourself.

Concrete Repair FAQs

Answers to common questions about this collection. For advice on a specific mix or project, contact our technical team.

What is a rapid setting concrete repair compound?
A rapid setting concrete repair compound is a cementitious material that sets in minutes rather than hours, so damaged concrete can be made good and returned to use quickly. UKCP FASTSET compounds combine special cements for rapid set and high early strength with powder polymers for adhesion and surface hardness.

Which FASTSET product should I choose?
Choose by working time. FASTSET 1 sets in 5 to 10 minutes for the quickest repair. FASTSET 30 sets in 20 to 30 minutes, giving time to shape the repair. FASTSET FS120 sets in about 2 hours, so a larger quantity of repairs can be carried out from one mix. FASTSET R4 (30) sets in 20 to 30 minutes and meets Class R4 of EN 1504-3 for high strength, high build repairs.

Does temperature affect FASTSET setting times?
Yes. All FASTSET products set faster in warm conditions and more slowly in cold conditions. The recommended minimum application temperature is 5°C. Mix only as much as you can place and finish within the setting time on the day.

What strength does FASTSET reach?
Typical compressive strength at 28 days is above 25 N/mm² for FASTSET 1, FASTSET 30 and FASTSET FS120, and above 45 N/mm² for FASTSET R4 (30). Adhesive bond strength is above 2.0 MPa for all four.

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