Concrete Mix Ratio in the UK: the Ultimate Guide for Builders and Diy Enthusiasts

Concrete Mix Ratio in the UK: The Ultimate Guide for Builders and DIY Enthusiasts

Welcome to the ultimate guide on concrete mix ratio in the UK!

As a builder or DIY enthusiast, you probably understand the importance of using the right mix ratio for your concrete projects. But with so many factors to consider, such as strength requirements, aggregate type and size, and weather conditions, it can be challenging to determine the perfect mix ratio. That’s where this guide for mixed onsite concrete comes in – to help you understand the basics of mix ratios, the factors that affect them, and how to calculate the right mix ratio for your specific needs.

What is mixed onsite concrete?

Mixed onsite concrete refers to concrete that is mixed on location at the construction site rather than being prepared and transported from a central plant. This type of concrete is often used in construction projects that require a specific mix ratio or where the transportation of concrete is not practical or cost-effective.

Mixed onsite concrete is made using a mobile batching plant that can be set up on the site, which allows for precise control over the mix and the ability to adjust the mix as needed. This results in a stronger final product, making mixed onsite concrete a popular choice among builders and DIY enthusiasts in the UK.

In order to create a durable concrete mix, it’s essential to understand the basics of the concrete mix ratio. Simply put, a mix ratio refers to the proportion of different ingredients that are used to create concrete, including cement, sand, and aggregate.

Basics of concrete mix ratio

First, let’s discuss what a mix ratio is. A mix ratio is the proportion of materials used in making concrete, including cement, aggregates (such as sand, gravel, or crushed stone), and water. Mix ratios are expressed as a series of numbers, such as 1:2:3, which means one part cement, two parts sand, and three parts gravel.

Secondly, it’s important to understand that different types of mix ratios exist for different applications. For example, a structural project mix ratio may differ from a non-structural or decorative project. Moreover, some mix ratios may be more suitable for specific environmental conditions, such as extreme heat or cold.

Lastly, it’s essential to know how to read a mix ratio. The first number represents the amount of cement in the mix, the second number denotes the amount of sand, and the third number indicates the amount of gravel or other aggregates. Do note that the water-cement ratio (the amount of water compared to the amount of cement) can affect the final properties of the concrete, such as strength and workability.

Read looking for the best concrete mix ratio in the uk?

Now you can ensure that your concrete project meets your explicit requirements and is built to last.

Common concrete mix ratios in the UK

In the UK, common mix ratios include:

  • 1:1.5:3 for general-purpose use
  • 1:2:4 for foundations and retaining walls
  • 1:3:6 for floor slabs and footings

These ratios are based on the volume of cement, sand, and coarse aggregate used in the mix. Builders and DIY enthusiasts can adjust the ratios depending on the specific needs of their project.

Factors affecting concrete mix ratio

In order to create the perfect concrete mix for your project, consider the factors that can affect the mix ratio, such as the required strength of the concrete, the type and size of aggregate being used, and the climate and weather conditions at the time of mixing. Strength requirements will vary depending on the intended use of the concrete, and different types of aggregate can have varying effects on the final mix.

Climate and weather conditions can also play a role, as extreme temperatures or moisture levels can impact the concrete’s curing process and overall strength.

Learn more on how to speed up concrete drying

By understanding these factors and their impact on the mix ratio, builders and DIY enthusiasts can create a high-quality concrete mix for their specific needs.

How to calculate the right mix ratio?

Calculating the right mix ratio for your concrete project can seem daunting, but it doesn’t have to be. Let’s break down the calculation formulas and factors you need to consider to get the perfect mix!

You can calculate the mix ratio by determining the amount of cement, water, and aggregates you’ll need based on the volume of your project. Online mix ratio calculators are also available to simplify the process. However, it’s crucial to understand the factors that affect the mix ratio.

*Use our online mix ratio calculator to get the perfect mix for your project.

The formula for Calculation By Volume

The volume of concrete = Volume of cement + Volume of sand + Volume of aggregate

Tips for mixing and using concrete

When working with concrete, take proper safety precautions to avoid any accidents or injuries.

  • Wear protective gear, such as gloves, safety glasses, and a dust mask, to protect yourself from concrete dust and potential splashes.
  • Ensure adequate ventilation when working with concrete to avoid inhaling harmful fumes.
  • When lifting heavy bags of concrete or other materials, be sure to use proper lifting techniques and avoid overexerting yourself.
  • Keep your work area clean and organized to avoid tripping hazards and other accidents.
  • Follow manufacturer instructions and safety guidelines when using power tools like mixers and saws.
  • Use the right tools and equipment for the job, including a sturdy mixing container, a mixing tool, a wheelbarrow or bucket for transporting the mixed concrete, and a trowel for smoothing the surface.
  • Measure and mix the ingredients carefully according to the recommended mix ratio for your project to ensure that all the ingredients are evenly distributed.
  • Add water slowly and carefully, checking the consistency of the mix frequently to ensure that it is not too wet or too dry.
  • Pour the concrete into small batches, spreading it evenly and compacting it to eliminate air pockets.
  • Use a straight edge or trowel to level the surface and create a smooth finish.
  • To ensure proper curing, keep the surface moist for at least 7 days after pouring.


This guide has covered the basics of concrete mix ratios in the UK, including what they are, how to read them, and the different types of mix ratios available for specific applications. With this knowledge, anyone in the UK can create custom concrete mixes that meet their distinguishing necessities and ensure a high-quality finished product. Remember, using the right mix ratio is crucial for the success of your concrete project.