Understanding Concrete Strengths

At CSB Concrete, we offer volumetric concrete solutions that cater to various strength requirements, perfectly aligned with your unique project specifications. Our range spans from C10 (commonly known as Gen 1) to C50, along with an extensive selection of screed.

Concrete, comprising cement, water, and aggregates (sand and stone), is meticulously crafted to achieve specific strength grades through precise ingredient combinations. As these components blend, they gradually solidify and gain strength over the course of a month.

Concrete strength is measured in newtons. For example, C10, a popular mix with a strength of 10 newtons, is suitable for general non-structural construction projects. In contrast, the more robust C40, with a strength of 40 newtons, is ideal for structural endeavors like foundations, beams, and roadworks.

Gen 1 concrete (C10) is a flexible blend that excels in various lightweight projects. Its key features include:

  • Versatile formulation widely used in general-purpose housing applications.
  • Ideal for pad, conservatory, wall, or shed foundations.
  • Suited for domestic foundations in DC-1 soil without reinforcement.
  • Appropriate for oversite beneath suspended floors or binding house floors.
  • Well-suited for drainage works, trench filling, and select agricultural uses.
  • Suitable for cavity and mass fill, kerbing, haunching, and unreinforced strip footings.
  • Finds utility in non-structural mass concrete applications within DC-1 non-aggressive ground.

Strength: 10N

Progression: Concrete is ready for light foot traffic within 24 to 48 hours of placement. By the seventh day, it attains about 70% of its intended strength. Optimal design strength is achieved at the 28-day mark, making it suitable for accommodating heavy vehicles. Consult with your structural engineer or builder to align with your project’s specific requirements.

Gen 2 concrete (C20) features a higher concentration of cement, making it easy to work with and highly versatile. Its attributes include:

  • Frequently chosen for light-duty applications.
  • Suited for single-story foundations, internal floor slabs without metal content, and domestic garage floors.
  • Recommended for bases under sheds, driveways, workshops, and patios.
  • Appropriate for patio under paving and unreinforced oversites or bases for garages, sheds, greenhouses, and conservatories.
  • Ideal for blinding, mass concrete filling, and trench fill.
  • Suitable for un-reinforced strip footings and certain agricultural applications.

Strength: 20N

Progression and Consultation: The curing process follows a similar trajectory to Gen 1 concrete, reaching full design strength by the 28th day. Engage your structural engineer or builder for project-specific guidance.

ST2 concrete (C25) strikes a balance between cement concentration and strength, offering versatility for a wide range of domestic and commercial needs, including:

  • Serving un-reinforced strip footings, fence post footings, and general groundwork.
  • Ideal for mass concrete, trench filling, and diverse foundation applications.
  • Suited for house extensions, patios, and house floor blinding.
  • Finding utility in kerbs, unreinforced house floors, and select agricultural applications.
  • Appropriate for drainage and filling around manholes, mass concrete in non-aggressive ground, and more.

Strength: 25N

Progression and Consultation: Similar to previous mixes, optimal strength is achieved by the 28th day, with guidance from your structural engineer or builder as needed.

ST3 concrete (C30) is designed for external applications, emphasizing durability and increased resistance to challenging conditions. It is commonly chosen for:

  • Pavements, paths, and patios.
  • Driveways, garage and shed bases, pavements, and foundations.
  • Hostile environments or areas subject to aggressive chemicals and abrasion.

Strength: 30N

Progression and Consultation: As with previous mixes, anticipate reaching optimal strength by the 28th day, with professional consultation for project-specific needs.

ST5 concrete (C40) is tailored for structural applications, making it suitable for industrial, commercial, and domestic uses that demand strength and reliability:

  • Suited for structural elements, industrial applications, HGV parks, and agricultural equipment storage.
  • Appropriate for foundations, floor slabs, and various post capacities.
  • Ideal for suspended, sub-floor voids, or ground-bearing applications.

Strength: 40N

Progression and Consultation: Strength development follows the same trajectory, reaching full design strength by the 28th day.

C50 concrete is specifically formulated for demanding projects where resilience and performance are paramount. It is well-suited for:

  • Foundations, roadworks, piling, and stable flooring.
  • Aggressive environments and situations requiring elevated freeze-thaw cycle protection.

Strength: 50N

Progression and Consultation: Like the preceding mixes, optimal strength is achieved by the 28th day, guided by the expertise of your structural engineer or builder.

Determining Your Required Concrete Type

At CSB Concrete, our product range encompasses a variety of strengths, ranging from C10 (Gen 1) to C50. Concrete’s composition of cement, water, and aggregates allows for a structured evolution, with strength increasing over time.

Strength, measured in newtons, distinguishes the various concrete types. For personalised guidance in selecting the optimal concrete for your project, do not hesitate to contact us. We’re here to assist you every step of the way.