C55 Concrete (55N) – Uses, Price & Delivery in London
For ultra-high-performance structural requirements, C55 concrete is a premium, high-strength mix engineered for extreme load-bearing and environmental resistance. With a standardised formula, it attains a strength rating of 55 newtons after a curing period of 28 days. C55 is frequently used in advanced civil engineering and large-scale infrastructure where superior structural density is required.
C55 is ideal in the following applications:
- Pre-cast bridge beams and heavy-duty structural sections
- High-stress motorway and airport runway infrastructure
- Reinforced specialist piling for tall buildings
C55 Concrete – Free Delivery in London & Surrounding Areas
C55 concrete is an ultra‑high‑strength structural concrete mix designed for demanding applications where exceptional load‑bearing capacity, durability, and long‑term performance are essential. With a characteristic compressive strength of 55 N/mm², it sits at the upper end of the concrete strength spectrum used in domestic and light commercial construction. C55 is engineered to withstand extreme loads, aggressive environmental conditions, chemical exposure, and continuous mechanical stress, making it the ideal choice for projects where failure is not an option.
Although C55 is more commonly associated with civil engineering—such as bridge decks, industrial floors, and high‑rise structures—it also has important uses in domestic construction. Homeowners and contractors rely on C55 for large garden buildings, heavy‑duty foundations, retaining walls, machinery bases, and high‑load slabs. When a project demands maximum strength and long‑term reliability, C55 provides a level of performance that lower‑grade concretes simply cannot match.
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C55 Technical Characteristics
Strength Rating
C55 concrete delivers:
- 55 N/mm² compressive strength at 28 days
- Equivalent to RC50/55 in structural specifications
This makes it suitable for heavy structural applications and high‑load domestic projects.
Density & Durability
C55 is designed for:
- High density
- Low permeability
- Exceptional resistance to freeze‑thaw cycles
- Long‑term durability in harsh environments
Its dense matrix makes it ideal for areas exposed to moisture, pressure, or chemical attack.
Workability
Despite its strength, C55 can be supplied with a workable slump that allows for:
- Efficient placement
- Good compaction
- Compatibility with reinforcement
- Smooth finishing above ground
However, due to its high cement content and low water‑cement ratio, C55 requires more precise handling than lower‑grade mixes.
Setting Time
Typical setting times include:
- Initial set: 2–3 hours
- Final set: 6–10 hours
- Full cure: 28 days
C55 gains strength rapidly in the early stages, but full performance is achieved after curing.
Mix Composition
C55 contains:
- A very high cement content
- High‑quality coarse and fine aggregates
- Low water‑cement ratio
- Optional admixtures such as:
- Plasticisers
- Superplasticisers
- Silica fume
- Retarders or accelerators
These components ensure maximum strength, cohesion, and durability.
Material Compatibility
C55 is compatible with:
- Steel reinforcement
- Damp‑proof membranes
- Structural formwork
- MOT Type 1 sub‑bases
Avoid using C55 in:
- Lightweight structures
- Applications requiring flexibility
- Situations where lower‑strength mixes are more cost‑effective
Customer Testimonials
“We used C55 for the slab under our new workshop, and it’s been absolutely rock‑solid. Even with heavy machinery running daily, there’s been no movement or cracking. It’s exactly what we needed for a long‑lasting, high‑performance workspace.”
How to use our concrete calculator to work out your order
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Why Choose C55 Concrete?
C55 is the ideal choice when you need:
- A foundation for large or heavy domestic structures
- A reinforced slab for workshops, garages, or garden offices
- A heavy‑duty driveway or parking area
- Structural landscaping features
- A durable, long‑lasting concrete mix
It is not suitable for:
- Decorative finishes
- Lightweight structures
- Projects where lower‑strength mixes are sufficient
Questions we are often asked about C55 Concrete
C55 is an ultra high‑strength concrete used for major structural elements, heavy civil engineering works, large foundations, high‑load beams, industrial floors, and infrastructure requiring exceptional strength.
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Yes. C55 provides very high compressive strength suitable for bridges, columns, reinforced beams, and critical load‑bearing components.
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C55 offers outstanding durability and long‑term performance, making it ideal for structures exposed to heavy loads, harsh weather, or high traffic.
(From: C55 Concrete)
C55 reaches a compressive strength of approximately 55 N/mm² after 28 days.
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Yes. C55 can be pumped with appropriate admixtures such as superplasticisers to maintain workability due to its high cement content.
(From: C55 Concrete)
C55 begins initial set within a few hours depending on temperature, with full curing requiring around 28 days.
(From: C55 Concrete)
C55 is more expensive than lower grades but offers exceptional value in high‑strength, long‑lasting structural applications.
(From: C55 Concrete)
