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STRENGTHS AND GRADES OF CONCRETE

Discover the different strengths and grades of concrete available.
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Testimonials
Concrete King’s service was fantastic, and their concrete quality is unmatched. Highly recommend for any job.
Amanda Brown
We trust Concrete King for all our construction projects. Reliable, high-quality, and always on time.
Robert Harris
Concrete King’s concrete mix was perfect for our needs. Their prompt service and professionalism were much appreciated.
Jessica Martinez
Concrete King offers competitive pricing and top-notch concrete. Their team was very helpful and efficient.
Brian Kelly
Fast delivery and excellent quality from Concrete King. Our go-to supplier for all concrete needs.
Laura Wilson
Concrete King provided outstanding service and high-quality concrete. They made our driveway project smooth and hassle-free.
David Lee
Impressed with Concrete King's consistency and strength of their concrete. Great value for money.
Emily Roberts
  • State-of-the-Art Fleet with 22+ Vehicles
  • Daily Concrete Output of Over 400m³
  • ONLY PAY FOR WHAT YOU USE
  • Highest Quality of concrete
  • Enhanced Service Reach Across Kent
  • No mess, no waste
  • Same-Day or Next-Day Delivery Options
  • Flexible Out-of-Hours Deliveries
  • 2-hour delivery windows
  • Supply Depots in Essex and Kent

Call us for a quote on 0203 039 3170 or Enquire Online

Types of Concrete

We provide a wide selection of concrete types tailored to meet the needs of various projects. Whether you're working on a small residential job or a large-scale commercial venture, our range of concrete ensures we can accommodate your specific requirements.

The three main types of concrete we offer are:

  • On-site mixed concrete
  • Ready-mixed concrete
  • Volumetric concrete

Need concrete for your project? Call us at 0203 039 3170 today!

Concrete Strengths

From flooring to foundations, patios to driveways, the concrete used in any project must be strong enough to handle the loads it will endure. Concrete strength is assessed by the weight it can bear 28 days after being laid and cured.

How many concrete strengths are available?

Our concrete strengths range from grade C8 with a strength of 8 newtons to C40, which offers 40 newtons of strength. C8 is ideal for kerb backing and bedding, while C40 is our strongest concrete, designed to withstand heavy-duty loads.

Concrete Grading

We offer various concrete grades to meet different project needs. Our grades range from C8 – used for wet mix concrete in kerb backing and bedding – to C40, suitable for structural applications and heavy-duty farming needs.

We also provide PAV 1 and PAV 2 grades, which include air-entrainment additives that help protect surfaces from freeze-thaw damage.

What’s the difference between concrete grade and strength?

The grade of concrete is determined by its strength, which is measured in newtons. The higher the strength, the higher the grade. For more details, check our guide on "How to Determine a Grade of Concrete."

Explore the concrete grades and strengths we offer below or click on each type to learn more.

  • C8 / Gen 0
  • C10 / Gen 1
  • C15 / Gen2
  • C20 / Gen3 / ST1
  • C25 / ST2
  • C30 / ST3
  • C35 / ST4
  • C40 / ST5
  • Pav 1 and Pav 2
  • Screed 5:1
  • Screed 4:1
  • Pattern Imprint Concrete Mix

Type: C8 / Gen 0 Concrete

Purpose/Ideal For:

  • Kerb backing
  • Bedding 8N
  • Mass and cavity fill
  • Blinding
  • High load-bearing capacity
  • Low maintenance
  • Quick and easy to install

Strength:

  • 8N
  • 28 Day Strength

Type: C10 / Gen 1 Concrete

Purpose/Ideal For:

  • Pad, conservatory, wall or shed foundations
  • Domestic foundations built in DC-1 soil that are unreinforced
  • Oversite below suspended floors or binding house floors
  • Drainage works 10N
  • Filling trenches and some agricultural uses
  • Cavity and mass fill
  • Kerbing and haunching
  • Strip footings not reinforced
  • Mass concrete in non structural applications where DC-1 non-aggressive ground exists

Strength:

  • 10N
  • 28 Day Strength

Type: C15 / Gen 2 Concrete

Purpose/Ideal For:

  • Floors with no embedded metal
  • Unreinforced and reinforced strip footings for small walls
  • Foundation filling for trenches
  • Shed, walls and conservatory foundations
  • Steps and path paving
  • Blinding
  • Mass concrete fill that’s unreinforced

Strength:

  • 15N/mm2
  • 28 Day Strength

Type: C20 / Gen 3 / ST1 Concrete

Purpose/Ideal For:

  • Foundations (single storey)
  • Internal floor slabs which won’t contain metal and will be covered over
  • Domestic garage floors (if using as a workshop, use RC25/30 as a minimum
  • Bases for sheds, driveways and workshops
  • Patio under paving
  • Garage, shed, greenhouse and conservatory oversites or un-reinforced bases
  • Blinding
  • Fill of mass concrete or trenches
  • Strip footings that aren’t reinforced
  • Oversites

Strength:

  • 20N
  • 28 Day Strength

Type: C25 / ST2 Concrete

Purpose/Ideal For:

  • Un-reinforced strip footings and fence post footings
  • Un-reinforced foundations & general groundwork
  • Mass concrete & trench fill
  • Bases for extensions, houses or patios
  • House floor blinding and pad foundations
  • Kerbs, unreinforced house floors (with permanent finish) and patios
  • Some uses in agriculture
  • Drainage and filling around manholes or trenches
  • Mass concrete for non aggressive, non structural (DC-1) ground

Strength:

  • 25N
  • 28 Day Strength

Type: C30 / ST3 Concrete

Purpose/Ideal For:

  • Driveways
  • Paths
  • Patios
  • Garage and shed bases
  • Pavements
  • Foundations for extensions, houses, large walls and garages
  • Garage, shed, greenhouse or conservatory unreinforced oversites or bases

Strength:

  • 30N
  • 28 Day Strength

Type: C35 / ST4 Concrete

Purpose/Ideal For:

  • External slabs
  • Re-inforced walls and floors
  • Re-inforced bases for workshops
  • Unsuspended and unreinforced garage floors
  • Indoor floor slabs not containing metal
  • Bedding for channels and drains
  • Chamber benching

Strength:

  • 35N
  • 28 Day Strength

Type: C40 / ST5 Concrete

Purpose/Ideal For:

  • Structural applications
  • Industrial applications
  • HGV parks
  • Farms or stores used for agricultural equipment
  • Foundations for traffic sign posts, planted lighting columns and posts for environmental barriers
  • Floor slabs used for garages or houses which are partially or completely reinforced and either suspended, over sub-floor voids or ground bearing

Strength:

  • 40N
  • 28 Day Strength

Type: PAV 1 Concrete

Purpose/Ideal For:

  • Driveways
  • Car ports or domestic parking
  • External slabs (light duty)
  • Walkways or patios used for agricultural, domestic or industrial applications
  • Hard standing which is either reinforced or un-reinforced
  • House, extension or workshop bases which are reinforced or unreinforced

Strength:

  • 30N
  • 28 Day Strength

Type: PAV 2 Concrete

Purpose/Ideal For:

  • External slabs exposed to machinery and industrial vehicles
  • HGV yards
  • Car parks (heavy duty)
  • Agricultural storage areas, light storage or commercial buildings featuring reinforced bases
  • Flooring for garages or houses which have metal embedded in them

Strength:

  • 35N
  • 28 Day Strength

Concrete Screed Type 5:1

Purpose/Ideal For:

  • Internal Floors

Concrete Screed Type 4:1

Purpose/Ideal For:

  • Internal Floors

Purpose/Ideal For:

  • Driveways
  • Paths
  • Concrete walls
  • Outdoor concrete fireplace surrounds

Concrete Suppliers

On-site Mixed Concrete

We mix this type of concrete at the site of your project – this allows us to alter the mix as we go, which means we can accommodate for changes in requirements, such as more concrete being needed or a different grade being required. The refinable nature of this concrete means the perfect amount will always be created – no more, no less.

Ready Mixed Concrete

This is a batch of concrete created beforehand, at our batching plant. It’s designed according to the specific requirements of the customer.

Volumetric Concrete

Mixed in a volumetric mixing truck, this concrete’s popularity is mainly down to the fact it can be mixed to the precise amount required – no shortages and no surplus of concrete.

We also offer screed, graded at 4:1 and 5:1 for internal flooring work, whether that’s a sub-layer to prepare the floor for a finish, or whether it’s the finish itself.

WE ONLY PROVIDE QUALITY MIXED CONCRETE USINGPRIME AGGREGATE AND MATERIALS

SAME/NEXT DAY DELIVERY

We're ready for your delivery when needed.

Concrete Calculator

Calculating the right amount of concrete for your project can be challenging, especially if it’s your first time. Ordering too much can lead to unnecessary costs, while too little can cause frustrating delays. Thankfully, our UK-based concrete calculator takes the guesswork out of the equation, providing you with an accurate estimate of exactly how much concrete you’ll need.

Whether you're determining the amount of ready-mixed concrete for slabs or calculating the mix needed with coarse aggregate, we’ve got you covered.

To place an order or discuss your requirements, contact our friendly team today — we’re here to help you make the most of our concrete mix calculator.

For more options, visit our Concrete Calculator page.

Why choose Concrete King?

  • 24/7 Same or Next Day Delivery
  • High-Strength, Graded Concrete
  • Pay for What You Use
  • Out-of-Hours Availability
  • 2-Hour Delivery Windows

Why choose Concrete King?

VOLUMETRICVSREADYMIX

What are the benefits? Click below to find out

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BENEFITS OFVOLUMETRIC CONCRETE

  • Most efficient method of mixing concrete
  • Only pay for the concrete you use
  • Receive the exact amount of concrete you require
  • Mixed to the correct ratio for your requirements
  • Digitally measured and metered concrete
  • No chance of over or under ordering

BENEFITS OFREADYMIX CONCRETE

  • Exact amount of concrete for your needs
  • Completely cost effective service
  • Ideal for commercial or domestic projects
  • Fresh concrete poured from our mixing trucks
  • No over or under ordering
  • No part load or waste disposal charges

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