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Choosing the right concrete strength is essential for any project, from domestic driveways and patios to structural foundations and commercial slabs, as it directly impacts durability, performance, and long-term cost. Concrete is made from a mix of cement, water, sand, and aggregates, but by adjusting these ratios — and introducing specialist materials — different strength grades are created, measured in MPa (megapascals) and classified as C10, C20, C25, C30, C35, and C40. Each grade is designed for specific applications, from light non-structural work to heavy-duty structural use.
At Hertfordshire Concrete, we supply all mixes using volumetric concrete trucks, which mix concrete fresh on-site to your exact specification. This means no risk of the concrete setting in transit, no over-ordering, and zero waste — you only pay for what you use. It also allows us to adjust the mix during the pour if required, ensuring the perfect strength and consistency for your project.
We can also enhance your concrete with specialist additives, including plasticisers to improve workability, fibres to increase strength and reduce cracking, retarders to slow curing in warm conditions, and accelerators to speed up setting when time is critical. This flexible, on-site approach ensures you get the right concrete, at the right strength, delivered exactly when and where you need it.
Concrete is typically a mixture of cement, water and aggregates. Aggregates such as sand and stone interact with the water and cement to form a mixture that sets very hard and strengthens over the course of a month – the process is known as hydration. Our concrete experts understand how to mix cement in order to end up with the ideal concrete strength meaning that we can offer the range of different concrete as outlined below.
This type of concrete reaches a strength of 10 Newtons in 28 days. It can be used across a range of domestic and construction projects. Typically C10 concrete is used for non-structural construction for elements such as concrete pathways or patio slabs.
More sturdy and durable than C10, C15 concrete can be used in high usage areas for everything from floor blinding to kerb mix. It will reach a strength of 15 Newtons over the course of 28 days.
This is the strength of concrete where it can begin to be used for structural elements of a construction. For example, C20 can be used on domestic floors and foundations for lighter structures. With a strength of 20 Newtons after 28 days, it can also be used for anything from a garage base to driveway slabs.
C25 is an excellent multi-use concrete that is ideal for a variety of different commercial and domestic construction projects. With an excellent strength of 25 Newtons in 28 days, it is regularly used for laying foundations for house and bungalow floors.
This is a highly durable mix of concrete that can be used paths or roads that see use from heavy vehicles on a regular basis – for example, paths on farms or HGV slipways. At a strength of 30 Newtons after 28 days, C30 is highly resistant to weathering and climate changes.
A heavy duty concrete mix that hardens to 35 Newtons after 28 days. Typically used in commercial construction projects where the finished product needs to withstand heavy use. For example, it can perfect for creating walls, external slabs and structural piling. It is also commonly used for agricultural and construction industry buildings including barns and yards.
C40 is a very strong concrete grade that reaches a strength of 40 Newtons after 28 days. It can be used for the most heavy duty projects including roads, foundation beams in large buildings and more. It additionally has the durability to withstand harsh chemical environments where it can last against hazardous and acidic chemicals.
RC30 Concrete hardens to 30 Newtons. The concrete is mixed up to the European standards and is well regarded for its durability. RC30 is known most for it’s industrial usage, as it can help to build metal foundations.
It may be the case that you also require specific additives to your concrete mix to prepare it for a specific purpose.
These can be adding to the mix to elongate the curing process which gives you more time to work during the building phase.
The opposite of a retardant, these speed up the curing process.
These make the concrete more workable. This can be added if you need to lay the concrete quickly.
These additives are perfect for improving the strength of the concrete, making it more resistant to cracking.
Get in touch with our team—we’re here to help with the right solution for your project.
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For more information on the kinds of concrete that we offer or to get in contact about a project, please don’t hesitate to contact 3 Counties Concrete today.
