In the UK, construction projects often have to continue in less-than-ideal weather conditions. Intermittent showers are unfortunately unavoidable, which raises a question that we receive a lot at SRC Group: can you use ready to use concrete in the rain?
The straightforward answer is yes; ready to use concrete can be poured in the rain, but only when appropriate precautions are taken. Understanding how moisture affects the curing process is essential to maintaining the strength and durability of your finished structure.
In this blog, we’ve put together a handy how-to guide, which can make life a little easier when planning a project alongside the unpredictable British weather.
Ready to use concrete is produced by combining powder cement, aggregates (such as sand and stone) and water. The ratio of water to cement plays a crucial role in determining the final strength of the material. When additional water is introduced during a pour, such as that from rainfall, it can disrupt this delicate balance and may result in:
Whether you can use ready to use concrete in the rain depends largely on the intensity of the rainfall and the stage of the process.
Light rain
A light drizzle will not typically cause major issues with ready to use concrete, provided it’s not accumulating on the surface. In some cases, particularly warmer conditions, a minimal amount of moisture can even help to prevent rapid drying (which causes its own set of problems).
Moderate rainfall
If your project starts during a period where rain is consistent, additional precautions are required. Surfaces should be protected and close attention should be paid to any excess water collecting during the pour.
Heavy rain or standing water
Ready to use concrete should not be poured into areas where water has accumulated. Standing water can interfere with the successful long-term capabilities of the mix and lead to structural issues in the future. In these conditions, work should be paused until the area has had the chance to dry.
When poor weather is expected, preparation is key. The following measures could help to reduce any risks that may occur from using ready to use concrete in the rain:
Ready to use concrete typically reaches its initial set within two to four hours; depending on the strength applied. Once this stage is reached, light to moderate rainfall is unlikely to cause damage. In fact, moisture during the curing process can actually be beneficial as it helps to regulate the temperature and prevent the concrete from drying too quickly. The most critical period is during placement and the early stages of setting, when the surface is most vulnerable.
Working with an experienced supplier can significantly reduce the risks associated with adverse weather conditions. At SRC Group, our ready to use concrete is produced to precise specifications; this guarantees consistency and quality across every delivery. If weather conditions are a concern, adjustments can be made to the mix design prior to application; such as modifying water content or incorporating additives, this can improve overall performance and reduce vulnerability during the setting period.
As part of SRC Group’s commitment to developing greener construction methods, we also offer a range of low-carbon concrete options. We currently supply five types of STRC low-carbon mixes, each designed to significantly reduce carbon compared to traditional alternatives. Available from all four of our concrete plants, these mixes are suitable for ST and GEN applications and are fully-compliant with BS8500-2 and NHBC specifications. This means that you can maintain performance and reliability whilst also making a more environmentally responsible choice.
Before proceeding with ready to use concrete in uncertain weather, consider the following:
Rain doesn’t need to delay a project, but it does require careful planning and informed decision-making. By understanding how to apply ready to use concrete in the rain correctly, whilst also taking appropriate precautions, it’s possible to ensure that your project’s timeline stays on course, as well as the long-term quality of your structure.
With English weather it can be tricky to guess exactly when the right time is to start your project, but at SRC Group we’ve helped thousands of domestic and commercial projects to stay on track over the last 3 decades. If you’re unsure about which mix to use or would like some information about our ready to use concrete, simply get in touch and we’d be happy to help.
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