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Concrete Curing – How To Do It & What To Avoid
07th April 2020 Concrete Curing: What It Is, How To Do It Right, and What to Avoid
Curing concrete is not just a final step—it’s a make-or-break part of the process. Done right, it strengthens your slab and increases durability. Done wrong, even the best concrete mix can underperform or crack.
At Wright Readymix, we’ve supplied premium ready mix concrete across the South West and South Wales, and we know exactly what it takes to help your concrete reach its full potential. Here’s what you need to know to cure it properly.
Why Properly Curing Concrete Matters
Curing is a critical part of concrete installation. This is when the concrete gains its strength and durability through a chemical reaction known as hydration. For this to happen effectively, moisture levels must be controlled—too much water loss and the concrete won’t set as strong or as long-lasting as it should.
Even a high-quality concrete mix can fail without proper curing, while a standard mix, cured well, can outperform expectations. That’s why taking curing seriously is essential to the lifespan and performance of your concrete.
How Long Does Concrete Take to Cure?
Concrete strengthens over time, but most of the curing process happens within the first 28 days. Here's a general timeline:
- 24 hours: Light foot traffic is safe
- 7–10 days: Concrete reaches most of its strength
- 28 days: Fully cured for standard use
Hydration continues beyond 28 days, but the rate of strength gain slows significantly.
Do's and Don'ts of Curing Concrete
Do's
Water Curing
In the first 7–10 days, it's crucial to maintain moisture. Water curing—spraying a fine mist over the surface—helps keep the slab damp and prevents rapid drying, especially in hot or sunny weather.
Cover the Slab
If misting isn't practical, cover the concrete with a plastic sheet. Extend it beyond the edges of the slab by at least twice the depth of the slab and secure it with bricks or stones. Remove the sheet daily, wet the surface, and replace it for a minimum of 7 days.
Shelter from the Weather
To protect concrete from unexpected heat or frost, use temporary shelters or insulating blankets to stabilise the curing environment and retain moisture.
Don'ts
Don’t Pour in Extreme Temperatures
The ideal temperature for curing concrete is between 10–15°C. If it gets colder, hydration slows down or stops. Use insulating blankets in low temperatures. If temperatures rise above 23°C, extra hydration is needed to prevent cracking.
Don’t Load It Too Soon
Wait at least 24 hours before any light foot traffic. Avoid heavy traffic, including vehicles or machinery, for at least 10 days to prevent structural issues.
For high-quality ready mix concrete and expert support throughout the curing process, contact Wright Readymix today on 0117 958 2090.