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Concrete Specifications

Concrete Specifications

Prefabricated double layer reinforced walls and blocks with a minimum thickness of 200mm.

All concrete products are available in a range of colours to suit the environment they are in. Standard colour is grey but we also have other colours available which include: Green, Brown, Yellow, White and Grey (please ask for details). Additional charges apply for non-standard concrete colour.

Depending on the individual facility design there are various surface finishes available:

  • Smooth finish.
  • Sandblasted to create coarse surface finish.
  • Technical treatment to create coarse surface finish.
    • Heavy acid etch
    • Medium acid etch
    • Light acid etch
    • Ex mould
    • Polished finish

Where joints between elements are considered an entrapment under BS EN 1176 an elastic filler is used to gap fill. We use an elastic filler is used so that any movement or settlement of the elements does not cause the joint to crack and disintegrate.

Natural Sports have sourced UK manufacturing facilities for the majority of our concrete products to reduce our carbon footprint and we endeavour to ensure that our suppliers use sustainable sources for the raw materials they use in their manufacturing processes and use the most efficient process when manufacturing.

The environmental policies for Natural Sports and our suppliers are available on request.

 

STANDARD SPECIFICATIONS

SECTION 1 – PRECAST CONCRETE

1.1 GENERAL

All units supplied by Supplier will comply with the standards as outlined in this document.

1.2 QUALITY ASSURANCE

Supplier will ensure quality checks are carried out covering raw materials, mix quality, dimensional accuracy, reinforcement content and position etc.

1.3 TOLERANCE AND FINISH

1.3.1 Permissible Deviations – Manufacture of Precast Concrete Components as outlined in BS8110.

Tolerances of the finished elements are to be agreed with the customer at time of order, however typical tolerances worked to are outlined below;

LENGTH

L <=3.0m +3mm
3.0m <L <=6.0m +6mm
6.0m <L <=9.0m +8mm
9.0m <L <=12.0m +9mm
12.0m <L <=15.0m +11mm
15.0m <L <=18.0m +12mm

CROSS SECTION

W <= 250mm + 4mm
250mm <W <= 1250mm +6mm
1250mm <W <= 4000 mm +8mm

STRAIGHTNESS

L <=3.0m +3mm
3.0m <L <=6.0m +5mm
6.0m <L <=12.0m +6mm
12.0m <L <=18.0m +12mm

SQUARENESS OF CORNER

b <=1.2m +3mm
1.2m <b <=1.8m +5mm
b> 1.8m +6mm

TWIST

L < 6.0m & b < 600mm +3mm
ALL OTHERS +6mm

FLATNESS

+ 3mm in any 1.5m

POSITION OF CAST IN SOCKETS, SLEEVES AND OTHER FITTINGS CAST IN

Individual or group +3mm
Relative within group +2mm

1.3.2 Surface Finish of Concrete

The surface finish of all concrete shall be free from hungry patches and other defects, and shall be indicative of uniformly and fully compacted concrete.

All concrete elements will have a good standard of surface finish.

Front face and edges of units will be formed from ex steel moulds – Type A.

Rear of units, i.e troweled face will be either;

• Left as cast
• Brushed to provide a non-slip texture.
• Wood float with plastic floats.
• Trowelled with a smooth steel float.

Units will typically be supplied with an ‘left as cast finish’ unless otherwise agreed.

The condition of the moulds may have an effect on the final finish and minor imperfections should be expected. Supplier are responsible for ensuring that the moulds are refurbished and set out in such a way that the tolerances listed in the above table are achieved.

1.3.3 Quality Acceptance

Upon delivery / collection, all units must be visually inspected for defects by the customer.

Any customer defects or complaints must be highlighted to Supplier upon delivery / collection of the units. Supplier will not be held responsible for handling defects once the units have been dispatched

The customer is to ensure that all units are handled and where applicable stored, in a suitable manner, to avoid any unacceptable damage or staining occurring. See 1.4.1

Where applicable and agreed with the customer it is possible for minor defects to be made good on site. The colour and texture of the making good shall match, as near as possible, that of the surrounding concrete.

1.4 HANDLING AND TRANSPORT

1.4.1 Handling, Lifting and Transporting

All units must be handled, lifted and transported in a suitable manner which does not cause damage or cracking. Unless otherwise agreed with Supplier units should only be handled using the designated lifters. This may involve the need to ‘tilt lift’ from the bed of the delivery vehicle.

When units are lifted by forklift, tele-handler or crane, the weight shall be taken up gradually without snatch. When units are being lowered they shall not be dropped but must be lowered gently into position without impact.

A minimum of 2 bearers are to be used beneath all units located at 1/5 (under lifters) the length of the unit unless note otherwise on the delivery note.

Only approved and tested lifting equipment should be used when handling units. Approved lifting clutches can be supplied by Supplier Concrete Ltd as outlined in our quotation.

Please ensure all equipment used is tested and approved to lift the appropriate weight. All units supplied by Supplier are clearly marked with the individual weight of each component.

If stored on site the panels should be stacked no more than 6 no. high on flat, firm ground. Timbers must be aligned vertically to prevent panels bowing or cracking at fifth points from each end (under lifters).

Lifting clutches should be attached to the lifting pins cast into the top edge of the units and connected to the lifting tackle. It is imperative that lifting tackle is tested and certified to lift the designated weight, ensuring that chains are not at an angle greater than 60 degrees from vertical.

The precast units can then be gently lifted slowly into the vertical position, keeping the chains vertical at all times.

1.4.2 Marking of Units

All units will be clearly marked with the date cast, unit weight, customer and length of unit.

1.5 Loading and Reinforcement

Unless specified at time of order units will be supplied as non-load bearing units with nominal handling reinforcement. Units are also not designed to take any direct or indirect impact.. Typically the reinforcement content will be calculated on 70Kg/M3.

All reinforcement used will be CAREs approved and comply to BS4483; 1998 unless otherwise agreed.

1.6 CONCRETE COMPRESSIVE STRENGTH CLASS AND CONCRETE DESIGN

1.6.1 Compressive Strength Class (Design Strength)

Unless advised otherwise all concrete will be Compressive strength class C40/50 to BS-EN 206-1:2000 and BS 8500-2002.