Which concrete paver to choose for you project and why.

A few notes on the manufacturing process of concrete block paving using the wet cast vs dry cast methods

THE DRY CAST PROCESS

  • This process requires less water and a shorter curing time than a wet cast process
  • The concrete mixture is poured into a mould and compressed under high pressure
  • The pavers have an optimal water to cement ration,making them incredibly strong
  • There is no slump when the product is demoulded
  • The minimum standards for the manufacturing process  dry cast  concrete block paving is governed by the Sans 1058: 2012 v2.1 document. 
  • Paving standards in the SANS document relate to tensile splitting strength, dimensional stability and abrasion resistance.
  • The minimum standards are determined by a stringent testing process which guarantees that paving will not fail under certain conditions.
  • Applications for a dry cast concrete block will be roads, driveways, parking areas, high traffic areas, traffic circles, heavy duty industrial and civil installations, commercial projects.

THE WET CAST PROCESS

  • The wet cast manufacturing process requires more water and longer curing periods
  • A mixture is poured into a mould and then vibrated to release air bubbles
  • There is more water in the mix offering a strength suitable for residential purposes
  • There is a slump on the demoulding of the product
  • The Sans 927 :2013 document governs the manufacturing standards of we cast concrete (tests a cube of concrete)
  • The standards are not as stringent as it does not consider concrete blocks in particular and there is no determination of a minimum standard for abrasion resistance
  • Applications where you would use a wet cast product would include walkways, borders, pool paving, patio paving, residential projects as borders in commercial parking areas.

Applications of each process

Examples of wet cast products – Cobbles

wetcast paving Franschoek by C.E.L Paving C.E.L. Paving Products residential use of cobbles in slate finish

Cape Vue Guest House – Franschoek                  Wet Cast Cobble in Lava finish


Examples of dry cast products. Bond Paving 200 x 100 x 50

Mouille point dry cast paving C.E.L. PavingC.E.L. Paving Products Grey Bonds with Earth Bonds and Exposed Aggregate

The Promenade Mouille Point Cape Town                Bond pavers 200 x 100

For more information on these and other projects, click here

Should your require samples or additional examples of the two processes, please call us now on 0219055998