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Concrete Curing Agents and Retarders

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High quality Concrete Curing Agents and Retarders products

While applied in very similar fashions, and at similar times to the surface of new concrete, concrete curing agents and retarders are actually used to achieve different effects to the top face of the concrete, and should not be used in conjunction with each other.

What are Curing Agents for Concrete?


Concrete curing agents are either solvent-based acrylic resin polymers or water dispersed acrylic emulsions that are used to cure, harden and seal fresh or hardened concrete. By forming a film over the surface of the concrete, curing agents optimise the curing of the concrete by ensuring that full hydration is achieved.

The result is a higher strength and more durable concrete than if a curing agent was not used, as well as a reduction in surface dusting and cracking.

What are Surface Retarders for Concrete?


Sometimes called surface deactivators, surface retarders are used to deliberately delay the set of the surface of the concrete whilst allowing the rest of concrete to continue curing normally, without affecting the setting rate or strength gain.

When washed away after curing is complete, the surface retarder exposes the surface aggregate within the concrete, which can be to provide one of two benefits, either to create an improved and more receptive surface for the keying of subsequent concrete pours, or to create an present a more decorative finish to the surface of the exposed concrete.

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If you require assistance with concrete curing agents and retarders or need advice on which curing agent or retarder product is best suited for your requirements, contact our friendly teams in Kent - 01732 906 826 - or Leeds - 0113 521 6789.

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Frequently Asked Questions About Concrete Curing Agents and Retarders

What is a concrete curing agent, and why is it used?

A concrete curing agent is a liquid applied to freshly placed concrete to retain moisture and promote proper hydration during the curing process. It helps prevent premature drying, cracking, and surface imperfections, resulting in stronger and more durable concrete.

How does a concrete curing agent work?

Concrete curing agents form a thin film on the surface of freshly placed concrete, which seals in moisture and slows down the evaporation rate. This prolonged moisture retention allows for more complete hydration of cement particles, resulting in improved strength and durability.

When should I use a concrete curing agent?

Concrete curing agents are typically used on exterior concrete surfaces as well as interior floors. They are applied immediately after finishing the concrete to ensure proper curing and minimise the risk of surface defects.

How do I apply a concrete curing agent?

Concrete curing agents are typically sprayed or rolled onto the surface of freshly placed concrete immediately after finishing. It’s essential to apply the curing agent evenly and at the recommended coverage rate to ensure uniform moisture retention.

What is a concrete retarder, and why is it used?

A concrete retarder is an additive used to slow down the setting time of concrete, allowing for extended workability and placement time. It’s often used in hot weather conditions, large pours, or when a delayed setting time is desired for decorative finishes.

How does a concrete retarder work?

Concrete retarders function by temporarily inhibiting the hydration reaction of cement particles, delaying the formation of calcium silicate hydrate (C-S-H) gel, which is responsible for concrete setting. This allows for more extended workability and placement time.

When should I use a concrete retarder?

Concrete retarders are typically used in hot weather conditions or when a delayed setting time is desired for specific applications, such as decorative concrete finishes, stamped concrete, or large pours where extended workability is necessary.

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