A sudden outpouring of rain on the concrete surface can present unforeseen challenges. However, the extent of damage depends on the curing stage and the surface protection before the rain sets in.

So, due to the variables, it’s often important to consider certain factors to find a definitive answer to the how’s and whys of the effects of rain on concrete.

This blog presents those specific considerations that dictate the damage and the steps you can take to protect your concrete surface for longevity.

Well, it’s likely you envision a freshly laid blemish-free surface when you think of concrete pouring and finishing. However, Heavy Rain on Concrete might force you to rethink the pouring plans.

In fact, it’s not uncommon for a Concrete Paving Company to reschedule it on a day without rain in the forecast.

But if unpredicted showers have already grazed a freshly laid concrete surface, here’s what you need to know.


How Does Rain Affect Concrete?

Effects of rain on concrete

First things first, whenever we talk of substantial concrete damage and rain, it is usually associated with freshly laid concrete.


Because a concrete slab that has had time to finish and set is not exposed to severe damage. In fact, a little water on the surface can be beneficial to provide hydration for curing.

Though, all that changes if the concrete is freshly laid and the surface was not covered prior to the rain.

So, when a client asks us, Is It Ok to Rain on New Concrete, this is what we would say.

Of course, a light sprinkling may not be the cause for concern in most scenarios. But if it is pounding, the outcome can range from a badly damaged surface to the weakening of the slab.

Now, there are feasible solutions to address this, but before that, you must also know the extent of actual damage.

Here are some of the Effects of Rain on Fresh Concrete to be wary of:

#1. Washed Out Concrete

When rain strikes the surface, most issues will arise on the surface itself. The good news is the damage will likely not be threatening to the structural strength. However, the bad news is rainfall will wash off some of the cement and expose the aggregate.

It may also cause some color streaking if the concrete is integrally colored.


#2. Cracking

The washing out of the cement will lead to an uneven surface that’s exposed to rapid wear. A damaged concrete surface will obviously also invite more water in and then comes the freeze-thaw cycles. In fact, freeze and thaw cycles aggravate the damage and lead to cracking.

Thus, the Effect of Rain on Concrete will cause it to lose surface strength, giving rise to more issues in the future.


#3. Concrete Scaling

Other effects of rain on concrete may also include concrete scaling. This is essentially the peeling or flaking away of the near-surface concrete. It’s visible damage that may become more pronounced with traffic.

And as the surface becomes weak with water, it also has less resistance to these kinds of issues.

Irrespective of the kind of damage you encounter, if you suspect any sign, get them fixed right away. While this may cost a little on Concrete Repair, it’s still far better than starting over.

However, this also gives rise to another question.

Can Concrete Be Laid in the Rain?

Yes, it is possible. But the real question here is should you take such a step!

As you can guess by now, it wouldn’t be a wise thing to do.

So, in general, Pouring Concrete with Rain in the Forecast is best avoided. Though, that’s not always realistic.

If you operate a commercial establishment, chances are you do have to meet tight deadlines. Thus, you obviously can’t wait around for “favorable” weather conditions.

In this case, the best course of action would be to take as many precautionary measures as you can.

  • If rain is in the forecast, make sure to keep the necessary coverings (usually plastic sheets and tarpaulin) ready at all times.
  • If rainwater does get on the surface, don’t work it into the freshly laid concrete. Doing so will certainly compromise the water-cement ratio of the concrete mix.
  • Gently push any excess rainwater off the edge to wipe the surface.

Irrespective of the above recommendations, in most cases, you should postpone the Concrete Work if possible. Fortunately, there are many more things you can do to ensure a quality concrete finish.


How to Protect Concrete from Rain?

Well, a Rain Damaged Concrete is not a pleasing sight to behold. For this reason, you must know the specifics of its damaging effects and what practical steps you can take to steer clear of it.

Here are some of the things you can do in advance to plan ahead and minimize the effects of rain on concrete.

#1. Thorough Worksite Assessment

Ask your concrete contractor to thoroughly inspect the work area. Most commonly, they will check for the dryness of the surface and the location of gutters on their own. Also, check for water-filled cavities.

Can You Pour Concrete on Wet Ground? No, as the extra water will work its way into the concrete mix leading to a weak structure.


#2. Check the Weather Forecasts for Rain

As mentioned, never plan to pour fresh concrete when the weather is not suitable for it. If it is absolutely unavoidable, make sure you have all the necessary waterproof materials at hand.

However, Rain 12 Hours After Pouring Concrete shouldn’t be a major issue as by that time the concrete sets.


#3. Inspect the Surface Following Rain

There is always the possibility of some damage in the case of Rain After Pouring Concrete Foundation. The probability also increases if you weren’t able to cover the area entirely before the rain poured.

However, to avoid bad effects of rain on concrete, let excess water on the surface evaporate on its own. This is probably the only way to maintain the water-cement proportion in the right ratio. You may also have to remove the water from the surface with the help of a broom or garden hose.

While it’s unlikely, but if there’s still some damage, here’s what you should do.


How to Fix Rain Damaged Concrete?

Effects of rain on concrete

The best time to examine the surface for any damage is right after the rain completely stops. Also, check the edges of the concrete for possible damage.

Rain on Concrete After 12 Hours will rarely show any signs of severe damage. Henceforth, it should be fine to carry out the rest of the finishing operations after checking the surface thoroughly.

One way is to use a scratch test to find out if the surface is hard enough. Moreover, you may have to think about further repairs if the surface feels rough and powdery and a little brittle.

Though, most of the damage is visually apparent due to the effects of rain on concrete texture. Contractors may also choose to remove the weak layer by grinding and resurfacing it.

It’s probably better to get the assistance of a professional when it comes to concrete repairs and pouring concrete in the rain. Skilled contractors at Main Infrastructure in Toronto have the required industrial experience to help you.


Receive Professional Concrete Assistance from Local Experts in Toronto

Get in Touch with Main Infrastructure!!

We implement the best industrial practices for concrete finish and repair services that last.

Our team works diligently to help you maintain the condition of your concrete structure all round the year. And that includes protecting the surface and structural bond from the exploits of the changing weather.

We’ve been providing commercial and civil concrete finishing and repair services for more than a decade. Moreover, our expertise allows us to house a team that’s equally skilled and well-versed at what they do.

Our full range of concrete services encompasses a broad selection of offerings including:

  • Concrete Paving Services
  • Concrete Sidewalks, Walkways & Paths
  • Curbs and Curbing Repair
  • Concrete Sawing / Cutting
  • Landscape Curbing / Edging Installation
  • Concrete Parking Lots
  • Crack Repair; Epoxy Injection and Urethane Grout Injection

Main Infrastructure carries out all the assessments in line with your predetermined specifications. Further, our team works closely with you and the engineers to deliver the most superior product.

Give us a call @ +1 (416) 514 0809 for a quick walkthrough of your concrete project and a free quote!!

rain effects concrete

1 thought on “How Does Rain Affect On Fresh Concrete? [All You Need To Know]

  1. Thanks for the tip that inspecting concrete surfaces after rain will help in avoiding damages on them. I’m interested in getting concrete services soon in order to have a sturdier walkway in my property that’s not made out of dirt. I’d like to make sure that the walkway would be very resilient to the typical weather where I live.

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