Specification for sign posts

• Concrete

  The concrete shall consist of 13mm quartzitic stone, Swartkops River sand and Portland Cement, weigh-batched to produce a mix which has an average compressive strength of 50MPa at 28 days for 150mm test cubes.

  The mix shall be compacted by vibration in steel moulds, to produce dense concrete.

• Prestressing Wire

  The posts shall be prestressed with four 5mm diameter crimped prestressing wires which shall be accurately positioned in the four corners of the moulds to give a concrete coverage of 20mm.

  The prestressing wire shall comply with B.S. 5896:1980 having a yield stress of approximately 1500MPa and Young's Modulus of approximately 200GPa.

  The prestressing wires shall be equally tensioned in the moulds by a force producing an initial stress of not more than 70% of the 0,2% proof stress.

  No prestressing wires shall be exposed when the posts are erected in concrete.

• Bending Moments

  The posts are designed to resist a minimum bending moment of 2,5kNm in any position before initial failure occurs.

  (Note: The force required to break a post so that it does not fully recover is considerably greater than the above specification.)

• Dimensions

  The posts are tapered from top to bottom.

  The top of the post shall measure 80mm x 80mm nominal. The bottom of the post shall measure 110mm x 110mm nominal. The overall length of the post shall be 3000mm.

  The top of the post shall be rabbeted to form a 70mm x 70mm x 6mm tenon to accommodate specially designed street name signs.

Specification for precast road signs

Cavcon road signs shall comply with the SA Road Manual in all respects.

• Concrete

  The concrete shall consist of 13mm quartzitic stone, Swartkops River sand and Portland Cement, weight-batched to produce a mix which has a compressive strength of 50MPa at 28 days for 150 mm test cubes.

  The concrete for the sign backing shall be vibrated in steel moulds to give a very hard, smooth, and dust free surface and free of air holes.

• Retro-Reflective Sign Face

  The retro-reflective sign face shall be manufactured from 3M® Scotchlite™ materials and shall come with an adhesive backing. The sign itself may be screened onto the face of the reflective material or cutout reflective pieces stuck onto the face.

• Concrete Backing for Sign Face

  The concrete backing shall be 40mm thick and sealed on its face with MCU 500 Polyurethane Sealer to create a finish suitable for bonding the sign face to. Care must be taken to eliminate all air pockets when applying the transfer to the sign backing.

• Sign Posts

  The sign posts shall be as per the specification for Sign Posts.

• Fittings

  Attaching brackets and bolts shall be zinc electroplated or hot dipped galvanised steel as required.

Specification for precast street name signs

• Concrete

  As per specification for Road Signs.

• Sign Blades

  The sign blades shall measure 150mm x 70mm wide with a variable length. The bottom of the sign blade shall be recessed to accommodate another sign blade so that two signs can be erected on one post at right angles to each other.

  The sign blades shall be double sided and reinforced with four centrally positioned 3mm high tensile wires.

• Sign Face

  The sign face shall be painted with SABS approved yellow road marking paint for the background and black enamel or black road marking paint for the stencilled letters. Alternatively, the sign face can be manufactured from 3M® Scotchlite™ materials as per the specification for Road Signs.

• Sign Posts

  The sign posts shall be as per the above specification for Sign Posts.

• Fittings

  Attaching brackets and bolts shall be zinc electroplated or hot dipped galvanised steel as required.

Technical drawings

Refer to our technical drawings page for detailed dimension and installation information.