How Do Weather Conditions Affect a Mix On-Site Concrete Pour?
In our previous blogs we have discussed the advantages associated the use of volumetric concrete trucks which deliver the raw materials and provide fresh site mixed concrete exactly where it is needed. We’re often asked what impact the weather has on this process, though? Are there ideal weather conditions for pouring concrete? And will extreme heat or cold reduce the quality?
In this blog, the Custom Concrete team offers guidance on the effect of rain, cold or heat on the quality of a concrete pour.
Pouring Concrete in a Heatwave
None of us particularly like working in summer temperatures when they reach 30 – 33°C as they did a few days ago. And if you are pouring concrete, it is certainly worth avoiding the hottest period of the day to do it.
The reason for this is that concrete cures faster in higher temperatures. This can cause problems as the concrete mix requires hydration in order to form the crystals which makes the concrete strong. There is also the risk that water will evaporate on the surface too fast, which could lead to cracking and shrinkage.
- Try to avoid the hours 11am-3pm for pouring concrete in hot conditions.
- Cover poured concrete with a plastic sheet to prevent evaporation.
- Make sure you have adequate people available to lay the concrete fast.
Pouring Concrete in an Icy Snap
Mixed on-site concrete requires temperatures to be above 2°C for mixing and pouring. In temperatures lower than this you run the risk of ice forming in the concrete mix. This reduces the strength of the concrete and severely slows down the curing process.
The Custom Concrete team advise against pouring site mixed concrete onto icy or frosty ground. If we’re faced with such conditions, we would recommend thawing the area before proceeding. Once poured, the concrete needs to be protected with an insulated covering to stop it freezing. Concrete will normally take longer to cure in cold weather.
A Concrete Pour in the Rain
At Custom Concrete we take great care to provide the correct concrete mix for the job that needs doing. Rain adds extra water to the site of the pour, which can affect the efficacy of the mix, leading to a reduction in strength, surface and finish, and shrinkage cracking.
The use of volumetric concrete provides the opportunity to tweak the mix according to the weather conditions we’re working in. Every member of our team is experienced in dealing with a range of weather conditions and can offer guidance based on that experience.
- Avoid pouring concrete on wet surfaces or accumulated water.
- Keep an eye on forecasts and cover the area in advance to prevent soaking.
- Check that your concrete mix is appropriate to the weather conditions.
Working With Custom Concrete
We are an independent provider of site mixed concrete to commercial, construction and residential customers in Bedfordshire, Buckinghamshire, and Hertfordshire. The Custom Concrete Calculator allows customers to assess the volume of concrete they require, and we can offer expert guidance on the appropriate mix for the job. All our concrete is mixed fresh, on site, where it is needed.
Would you like to order Custom Concrete fresh, site-mixed concrete? Call us today on 01525 861899 or contact us online.