Can You Mix Concrete in the Rain?

Can You Mix Concrete in the Rain?

Raining on Your Concrete Pour? Don’t Panic!

Your construction project is carefully planned, everything’s ready to go… and then you see the weather forecast. It’s going to rain on the day your volumetric concrete delivery is scheduled! You’re wondering – can you mix concrete in the rain?

Don’t stress – the experts at Custom Concrete have the answers. We understand that unexpected weather can be a real worry, especially with Spring being especially wet in the UK, but with some careful planning and the right approach, you can still get a great result from your concrete pour, even in the rain. Let’s look at what you need to do.

Understanding Rain’s Impact and When to Reschedule

Sometimes, rescheduling your concrete pour is the best option. Rain can affect the concrete mix in a few ways:

  • Reduced Strength – Excess water can dilute the cement, leading to a weaker overall concrete.
  • Surface Issues – Rain can wash away the cement paste near the surface, creating a weaker and more uneven finish.
  • Workability Problems – Heavy rain can make the concrete mix too soupy, making it difficult to place and finish properly.

Here at Custom Concrete, we understand that unforeseen weather can disrupt your plans. That’s why we’re flexible and will always work with you to find the best solution. If possible, we recommend rescheduling your volumetric concrete delivery for a drier day.

However, we know that sometimes rescheduling isn’t an option. Perhaps you have site labourers booked or other deadlines to meet. If that’s the case, don’t worry! The next section will provide you with some practical steps to help you proceed with your concrete pour in the rain, while minimising any potential risks.

Rain Delay? Your Step-by-Step Guide

With volumetric concrete, the good news is that the mixing happens on-site, in the volumetric trucks and is completely insulated from the weather. The challenge is to protect the mixed concrete during transportation to the site of the pour and pouring. Ideally, this should be done as quickly as possible after the mixing, to achieve the full benefit of the fresh concrete.

Here’s what to do:

Before Delivery

  • Prep Your Site – If rain is forecast, cover the area where you’ll pour the concrete with plastic sheeting or tarps before it starts. This will help keep the ground dry for when the concrete is poured.

During Delivery & Pour

  • Use a Concrete Pump for Transport (Optional) – Consider using a concrete pump to transport the mixed concrete from the volumetric truck to the pouring site. This can help minimise the amount of time the concrete is exposed to the rain and reduces the need for manual movement with wheelbarrows.
  • Be Ready to Cover Up – Have extra tarps, plastic sheeting, and timber on hand so you can quickly build a temporary shelter if it starts to rain during the pour.
  • Avoid Excess Water – If you’re pouring after a rain shower, ensure there is no standing water on the surface where the concrete will go. You don’t want the water mixing with the fresh concrete.

After the Pour

  • Protection – If possible, keep the newly poured concrete covered for a while to give it a chance to set without being too exposed to excess rain.

Spotting the Signs – Has Rain Damaged My Concrete?

Has Rain Damaged My Concrete?

After your concrete has been poured and has had the chance to cure initially, it’s important to check for signs of rain damage. Here are some things to look out for:

  • Surface Flaws – Look for pitting, unevenness, scaling, or a dusty surface. These can indicate that rain washed away some of the cement paste during the early stages of curing.

  • Cracks and Fissures – While some minor cracking is normal during curing, excessive cracking or wider fissures could be a sign of weakened concrete due to rain exposure.

  • Soft or Chalky Texture – Run your finger or a hard object gently over the concrete. If it feels soft or crumbles easily, then the rain likely compromised the mix.

What if I find damage?

Often, surface imperfections caused by rain can be fixed through resurfacing or application of sealers. If the concrete’s structural integrity is compromised, though, you might need to discuss removing and replacing the affected sections with your volumetric concrete supplier or a concrete specialist.

Bear in mind that even if there are no immediate visible signs of damage, rain-affected concrete might be more prone to wear and tear in the future.

Working with Custom Concrete – Your Hassle-Free Concrete Solution

Custom Concrete is your trusted partner for fresh concrete delivery in Bedfordshire, Hertfordshire, and Buckinghamshire. We’re committed to making your concrete projects a success, even in unpredictable weather!

Here’s what sets us apart:

  • Accurate Calculations, No Waste – Our Custom Concrete Calculator takes the guesswork out of ordering – you’ll know exactly how much concrete you need, saving you money and reducing environmental impact.
  • Perfect Mix, Every Time – We’ll create the ideal concrete mix for your project, with on-site adjustments possible to handle changing weather or site conditions.
  • Freshness Guaranteed – Our on-site mixing means your concrete arrives fresh and ready to use. We’ll deliver it right when you need it.
  • Need a Pump? We’ve Got You Covered – We offer concrete pump hire and can advise if your project would benefit from one.
  • Expert Advice – Our knowledgeable customer service team can answer all your concrete questions, from mix types to weather impact and ideal pouring conditions.

Ready for a smoother concrete experience? Contact Custom Concrete today for a free quote and experience the difference of fresh, on-site mixed concrete!

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