C30 Concrete (30N) – Uses, Price & Delivery in London
C30 is ideal in the following applications:
- Driveways and external hardstandings
- Pavement construction
- Foundation slabs for garages and houses
Technically reviewed by Jim Taylor, Owner of Mixit Concrete, with over 42 years of concrete-industry experience.
C30 Volumetric Mix Design Ratios
When batching raw volumetric materials, a standard C30 high-strength grade follows an exact 1:1:2 mix ratio (1 part ordinary Portland cement to 1 part clean sharp sand to 2 parts coarse 20mm aggregate). To guarantee a characteristic compressive strength class of 30 N/mm² at the full 28-day cure cycle, our computerised batch plants monitor material batch weights to maintain a minimum cement content parameter of 425kg per cubic metre (m³).
Maintaining this high cement-to-aggregate ratio ensures maximum structural density and superior tensile durability. It provides enhanced protection against heavy vehicle wheel loads, structural shear forces, and severe environmental freeze-thaw weathering cycles.
C30 Concrete – Delivered in London & Surrounding Areas
C30 concrete is a high‑performance, medium‑strength mix widely used in domestic, commercial, and light structural construction. With a characteristic compressive strength of 30 N/mm², it offers a substantial increase in durability and load‑bearing capacity compared to mixes like C20 and C25. This makes C30 an excellent choice for projects that require long‑term resilience, resistance to wear, and the ability to withstand heavier loads or more demanding environmental conditions.
In domestic settings, C30 is often selected for driveways that support frequent vehicle use, reinforced slabs, structural footings, and outdoor areas exposed to weathering or mechanical stress. It is also a popular choice for retaining walls, steps, and foundations for larger garden buildings. C30 strikes a balance between strength and workability, making it suitable for both hand‑laying and machine placement while delivering exceptional long‑term performance.
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C30 Technical Characteristics
Strength Rating
- 30 N/mm² compressive strength at 28 days.
- Often equivalent to ST3/ST4 or PAV1 in some UK specifications.
This strength level makes C30 suitable for structural elements, heavy‑use slabs, and load‑bearing applications.
Workability
C30 is typically supplied with a medium slump, though higher slumps can be requested for easier placement. Its workability allows for:
- Efficient compaction
- Smooth finishing
- Compatibility with reinforcement
- Reliable performance in both warm and cool conditions
Despite its higher strength, C30 remains manageable on site and can be placed with standard tools and techniques.
Setting Time
Typical setting times include:
- Initial set: 2–3 hours
- Final set: 6–8 hours
- Full cure: 28 days
C30 can usually be walked on within 24–48 hours and built upon shortly after, depending on weather conditions.
Mix Composition
C30 contains:
- A higher cement content than C25
- Fine and coarse aggregates
- Water adjusted for slump
- Optional admixtures such as plasticisers, retarders, accelerators, or air entrainers
The mix is engineered for strength, durability, and resistance to environmental stress.
Material Compatibility
C30 is compatible with:
- Steel reinforcement
- Damp‑proof membranes
- Concrete blocks and bricks
- Timber formwork
- Compacted MOT Type 1 sub‑bases
Avoid using C30 in:
- Sulphate‑rich soils without specialist cement
- Applications requiring extremely high compressive strength (C35–C50 recommended)
Customer Testimonials
“We used C30 for the slab under our new workshop, and it’s been absolutely rock‑solid. The finish is excellent, and even with heavy machinery on top, there’s been no movement or cracking. It’s exactly what we needed for a long‑lasting workspace.”
How to use our concrete calculator to order
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Why Choose C30 Concrete?
C30 is the ideal choice when you need:
- A heavy‑duty driveway or parking area
- A reinforced slab for garages, workshops, or garden offices
- Foundations for larger domestic structures
- Structural landscaping features
- A durable, long‑lasting concrete mix
It is not suitable for:
- Industrial floors with extremely heavy loads
- Multi‑storey structural foundations
- Applications requiring very high compressive strength (C35–C50 recommended)
For those applications, higher grades such as C35, C40 or C50 are more appropriate.
Engineering Specifications & Standard UK Code Equivalencies
For building contractors, structural engineers, and local authority inspectors, C30 concrete is specified under British Standard BS 8500-2 as the direct equivalent to PAV 1 (Paving Mix 1) and ST3 Standard Mixes. This means it satisfies the standard design requirements for reinforced commercial driveways, external heavy vehicle parking bays, and structural house rafts in moderately aggressive ground conditions (Design Chemical Class DC-1 to DC-2).
Choosing a C30 mix configuration provides the necessary structural load-bearing parameters for heavy-duty commercial operations, industrial floor toppings, and retaining walls. If your site plans call out an ST3 or PAV1 mix descriptor, this C30 formulation meets or exceeds those exact engineering criteria.
Slump and Workability Variations for On-Site Placement
Depending on how the mix is being placed on your site, the workability of the batch can be adjusted. For large-scale external aprons or parking bays where a brushed slip-resistant texture is required, we supply an S3 slump consistency. This allows for clean screeding while ensuring the surface holds a durable textured finish.
If you choose to use our ground line or boom concrete pump hire services for deep foundation rafts or structural columns, we adjust the parameters to an S4 slump using specialized superplasticizers. This maximum fluid workability allows the high-strength concrete to pass through dense steel reinforcement matrices without creating honeycomb voids.
Questions we are often asked about C30 Concrete
C30 is a high‑strength concrete widely used for structural applications including reinforced slabs, beams, columns, driveways, roadways, and commercial foundations.
(From: C30 Concrete)
Yes. C30 provides strong compressive performance suitable for heavy load‑bearing elements in both residential and commercial construction.
(From: C30 Concrete)
C30 delivers excellent durability and strength, making it ideal for reinforced concrete elements requiring long‑term performance under heavier loads.
(From: C30 Concrete)
C30 reaches a compressive strength of approximately 30 N/mm² after 28 days, offering high reliability for demanding construction tasks
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Yes. C30 can be pumped effectively, and admixtures may be added to enhance workability depending on access and conditions.
(From: C30 Concrete)
C30 begins to set within a few hours depending on weather conditions. Light traffic is typically possible within 24–48 hours, while full curing takes 28 days.
(From: C30 Concrete)
While more costly than lower grades, C30 is cost‑effective for structural applications due to its strength, durability, and reduced need for repairs over time.
(From: C30 Concrete)
Technically reviewed by Jim Taylor
Jim Taylor, Owner of Mixit Concrete
This guide was technically reviewed by Jim Taylor, the owner of Mixit Concrete, who has over 42 years of experience in the concrete industry.
Drawing on decades of practical industry knowledge, Jim reviewed the information relating to C10 concrete strength, common applications, volume calculations, delivery requirements, concrete pumping and site preparation.
Jim oversees Mixit Concrete’s operations and has extensive first-hand experience supplying ready-mix concrete for domestic and commercial projects across London, Essex and Hertfordshire.
Technically reviewed: 16th June 2026
Not sure if the C30 high-strength grade is right for your project layout?
If you require extreme industrial strength for specialized heavy machinery foundations, look at our C40 Structural Concrete Guide. For standard domestic house extensions or garage workshop slabs, view our C25 Standard Concrete Specifications.
