A homeowner in Cheshunt wanted to create a multi‑level garden with a retaining wall capable of holding back several tonnes of soil. The contractor recommended C45 concrete due to its high strength and excellent resistance to soil pressure and moisture.

After excavating the area and installing steel reinforcement, the team poured C45 concrete into the formwork. The mix flowed well, allowing the team to achieve a smooth, even finish. Within 48 hours, the wall was firm enough to remove the formwork, and after a week, the homeowner began landscaping the area.

Six months later, the retaining wall showed no signs of movement, cracking, or water ingress. The homeowner praised the durability and finish of the concrete, noting that it transformed the garden into a functional, attractive space.

Working Time

You typically have 60–90 minutes of workable time after delivery. This can vary depending on:

• Temperature
• Slump
• Use of admixtures

Plan placement efficiently, especially in warm weather.

Temperature Considerations

• Cold weather: C45 may take longer to set; accelerators can help.
• Hot weather: Avoid adding water to extend workability — this weakens the mix.
• Frost: Protect freshly placed concrete from freezing for at least 24 hours.

Placement Tips

• Ensure the sub‑base is compacted and level.
• Use formwork to maintain shape and depth.
• Vibrate lightly to remove air pockets, especially when using reinforcement.
• Use a tamp or straightedge to level the surface.

Finishing

C45 can be finished to a smooth or textured surface depending on the application. For slabs:

• Use a float for a smooth finish
• Use a brush for a slip‑resistant texture

Curing

C45 benefits from:

• Light misting in hot weather
• Covering with sheeting to prevent rapid moisture loss
• Protection from heavy rain during the first few hours

Material Reactions

C45 is generally inert, but avoid:

• Direct contact with aluminium
• Use in sulphate‑rich soils without specialist cement

C45 is one of the strongest mixes used in domestic construction. Its primary applications include:

1. Heavy‑Duty Driveways and Parking Areas

C45 is ideal for driveways that support:

• Cars
• Vans
• 4x4s
• Light commercial vehicles
• Occasional heavy loads

Its strength ensures long‑term resistance to cracking, rutting, and surface wear.

2. Reinforced Concrete Slabs

C45 is commonly used for reinforced slabs in:

• Workshops
• Garages
• Garden offices
• Outdoor entertainment areas
• High‑traffic patios

When combined with steel mesh or rebar, C45 provides exceptional load‑bearing capacity and crack resistance.

3. Structural Foundations

C45 is suitable for foundations for:

• Two‑storey extensions
• Large garden buildings
• Retaining walls
• Boundary walls
• Outdoor kitchens

Its strength ensures long‑term stability and resistance to settlement.

4. Retaining Walls and Structural Landscaping

C45 is ideal for:

• Retaining walls
• Steps and staircases
• Raised platforms
• Structural garden features

Its durability makes it suitable for areas exposed to moisture, soil pressure, and freeze‑thaw cycles.

5. Bases for Heavy Equipment

C45 is often used for:

• Hot tub bases
• Outdoor kitchens
• Heavy garden structures
• Machinery pads

Its high strength ensures long‑term performance under sustained loads.