Concrete in the Cold – How to Avoid Costly Winter Mistakes
If you’re working on a building project during the colder months of November through to March, it’s critical to understand how dropping temperatures can affect your results. Freezing temperatures can cause major problems for freshly laid concrete, leading to cracks, reduced strength, and potential project failure.
As a local provider of volumetric concrete, the Custom Concrete team is well aware that construction timelines don’t pause for the weather. Our volumetric concrete is mixed on-site to your specifications, minimising potential delays.
In this blog, we go through the tips and techniques that anyone pouring concrete in cold weather, no matter the size of the project, needs to know.
Concrete in Cold Weather – Know Your Temperature Limits
Successfully pouring concrete in cold weather requires a good understanding of how temperature affects the process. Here are the temperature thresholds you need to be aware of:
The Ideal Range
10°C to 30°C is the ideal temperature range for pouring concrete. Within this range, the chemical reactions that harden the concrete work efficiently and unproblematically.
The Danger Zone
- Below 10°C – Hydration slows down, and the concrete takes longer to gain strength.
- Below 4°C – Hydration slows significantly.
- Below 0°C (Freezing) – The water in the concrete freezes and expands, causing serious damage. Avoid pouring concrete at or below freezing at all costs.
The First 48 Hours are Critical:
In the first 48 hours after pouring (at least), your concrete needs to be kept above 5°C to develop sufficient strength to resist freezing damage.
How to Protect Your Concrete in Cold Weather:
- Never pour on frozen ground.
- Monitor the concrete’s internal temperature using thermocouples, infrared thermometers or a wireless sensor.
- Use insulation, windbreaks, or ground heaters to keep the concrete warm.
Conquering the Cold – A Step-by-Step Guide to Pouring Concrete in Winter
Cold weather concreting requires careful planning and execution. Here’s a practical guide to secure success even in mid-winter:
1. Plan Ahead with Custom Concrete:
- Schedule your delivery in advance – Use the Custom Concrete Calculator to book your concrete delivery, allowing for potential weather delays. We’re flexible and can work with you to find the best pouring window, even in cold conditions.
- Choose volumetric concrete – Our volumetric mixing trucks mix your concrete onsite, so your concrete is fresh and at the correct temperature for the pour, minimising its exposure to the cold.
- Consider concrete pump hire – For larger projects or those with difficult access, our concrete pump hire can speed up the pouring process significantly, further reducing the concrete’s exposure to cold temperatures and ensuring a smooth, efficient workflow.
2. Prepare for the Pour:
- Monitor the forecast – Keep an eye on the weather in the days leading up to your pour. Aim for an air temperature above 5°C. If this doesn’t look possible, call our Customer Service team for guidance.
- Prepare your sub-base – The ground needs to be free of frost and ice. Use insulating blankets to prevent freezing, or ground heaters to thaw any existing frost.
- Use wind protection – If it’s windy, install temporary windbreaks to prevent rapid cooling of the concrete.
3. Protect Your Concrete:
- Insulate immediately – As soon as the concrete is poured and finished, cover it with insulating blankets to trap heat and prevent freezing.
- Maintain temperature – Monitor the concrete’s temperature, especially in the first 48 hours. Use additional heating or extra insulation to keep it above 5oC.
- Don’t rush formwork removal – In cold weather, concrete takes longer to gain strength. Leave formwork in place for longer than usual to prevent damage.
Custom Concrete’s Cold Weather Solutions
Facing icy conditions on your pour day? Don’t worry! Custom Concrete can help you overcome the challenges. Our experienced team can recommend the best concrete mix adjustments for cold weather, such as using accelerators to speed up setting time or adding air-entraining agents to improve freeze-thaw resistance.
We understand that weather can be unpredictable, so if icy conditions threaten your pour, we’ll work with you to reschedule your delivery for a better time. And please don’t hesitate to ask for our on-site support! Our team can provide guidance on cold weather concreting techniques, including insulation, heating, and temperature monitoring.
Custom Concrete provides reliable volumetric concrete delivery and expert advice for your cold-weather pours in Bedfordshire, Buckinghamshire and Hertfordshire.
Contact us today to talk through your requirements and get a free quote – 01525 861899