If you’ve recently had concrete poured, you might be asking yourself: how long does concrete take to cure? The short answer is that it continues curing for around 28 days, however you can typically walk on it much sooner than that.
There is an important distinction to understand and that is that concrete doesn’t just have to “dry” to become strong, whilst drying is the loss of moisture, curing is the process that allows concrete to develop strength. One of the major risk factors with drying concrete too quickly is that you can interfere with proper curing of your fresh pour.
For a typical concrete pour, the most commonly used timelines are as follows:
- 24-48 hours: Concrete is firm enough for careful foot traffic
- 7 days: Concrete can typically handle light vehicle traffic.
- 28 days: concrete reaches it’s full strength under the standard curing conditions and can be used as normal without limitations.
It’s important to remember however that the above ar general guidelines, and not hard and fast rules as the design, temperature, moisture levels, thickness and intended load can all impact the overall timeline.
Concrete Drying vs. Concrete Curing: What's the Difference?
One of the major sources of confusion when it comes to concrete is the difference between drying and curing. When people ask ”how long does concrete take to dry?”, what they’re generally asking is when they can walk on, drive over or use their concrete, but drying and curing are not the same.
Curing is an ongoing process, that is a chemical reaction between cement and water to allow concrete to properly develop it’s strength and durability.
If you’re asking how long concrete takes to dry, a more useful question could be: How long does concrete need before I can use it?
How Long Does Concrete Take to Cure?
When it comes to curing, the process is far longer, and typically takes around 8 days, but that doesn’t mean you don’t have to touch it for nearly a month. Here’s a closer look at the timelines we mentioned earlier.
24–48 Hours: Initial Hardening
During the first 24-48 hours, concrete becomes much harder and it’s typically able to be walked on, but it’s not ready yet for heavy equipment, cars or any type of large load. At this initial hardening stage the concrete still needs quite a bit of protection while the curing process continues. You should keep people, pets, bikes and unnecessary traffic away from the concrete wherever possible, however some light foot traffic is unlikely to cause harm.
7 Days: Significant Strength Development
After 7 days of proper curing, concrete has developed a lot of its end strength, and oftentimes it’s said it reaches 70% of its strength by the 7 day mark. For residential applications, like concrete driveways, this is an important milestone as it means light vehicle traffic is now appropriate.
28 Days: Design Strength
The 28-day mark is the endgame for concrete curing. However, it’s important to remember concrete may continue beyond this point if there’s still suitable moisture, however it’s most commonly at its design strength by this point. Heavy loads should proceed with caution, however industry standards indicate that at this point, the concrete should be able to be used as intended.
How Long Should Concrete Cure Before Putting Weight on It?
The answer here really does depend on the type and amount of weight. Whilst walking is generally safe at 24-48 hours, heavy loads are recommended to wait until at least 28 days.
To make sure you don’t damage your new concrete, you should follow the specifications laid out by your concrete company rather than relying only on the general timeline.
How Long Does Concrete Take to Set?
Another question often confused with curing and drying is setting, and this distinction is important because setting is the point when concrete is no longer workable. This matters because concrete can be set without being fully cured.
This is what you need to keep in mind:
- Setting = concrete is stiff and loses its workability.
- Drying = concrete losing moisture.
- Curing = concrete continues developing strength over days and weeks.
What Affects Curing of Concrete Time?
There are a number of different factors that can impact the overall concrete curing time of your project, here’s a few of the ones we encounter most often.
- Temperature: Concrete needs the right temperature for proper curing, and cold conditions can slow the process, whilst overly hot conditions can cause it to dry too quickly. If you’re planning on concreting in winter, you may want to invest in proper protection as freezing can damage fresh poured concrete.
- Moisture: Moisture is a must for curing, and if the concrete loses moisture too quickly the process can be disrupted, that’s why, depending on the project, your installation specialists might suggest covering the concrete to prevent moisture loss.
- Thickness: A small walkway is of course going to cure far quicker than a thick slab for a new build house, and if you’re planning on putting a large amount of weight on the concrete, you should allow some extra time for curing to prevent cracking.
The Verdict
When it comes to how long concrete takes to cure, the simple answer really is that it depends, but 28-days is normally a good benchmark. The most important thing is that you don't confuse drying with curing. As concrete needs appropriate moisture and temperature conditions to develop its strength properly, just because it looks dry doesn’t mean it’s fully cured.
If you’ve been looking for a team to help with your next concreting project, reach out to Ultimate Concrete, or check out our completed projects to see what we can do for you.
