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Beneficiated Concrete Finishes

New in South Africa and exclusive to Bosun

Bosun offers concrete pavers with various beneficiated finishes or surface textures, which are new in South Africa and exclusive to Bosun.  These finishes are achieved by means of technical processes with specialised machinery and equipment as shown below in these highly simplified graphic representations.

Ground Pavers

The Grinding of concrete involves cutting the surface or “face” of the concrete with a series of diamond tipped blades creating a fairly smooth texture. The smoothness of the surface texture is dependent on the use and application of the amount of cutting blades being used.

The desired outcome of this process is to expose stones with interesting natural colours on the surface of the pavers.

The difference between Grinding and Washed and Shot Blast is that stones on the surface of Ground pavers are perfectly flat and smooth whereas stones exposed by means of Washing or Shot Blasting will still have a naturally rounded shape.

Grinding is an expensive process due to blade costs.

Flattening grinder used to produce ground pavers

Shot Blast Pavers

The Shot Blasting process involves peppering pavers or kerbs with “Shot” or small beads of steel which are fired at high velocity by means of compressed air. The Shot actually dents the surface of the product bit by bit thereby dislodging small particles of concrete which then fall away. This exposes small stones and other aggregates in the topping.

In a sense the result is similar to that of washed pavers as described opposite but a Shot Blast texture is slightly smoother although more irregular than a Washed texture.

 

Shot blaster used to produce shot blast pavers

Ground and Shot Blast Pavers

A combination of the ground and shot blast processes as discussed above.

Washed or Exposed Aggregate Pavers

In the washing process fine cement particles are removed from the paver’s surface with a special water spraying technique which exposes beautiful small stones in various colour schemes, creating interesting and hard-wearing surface textures.

Water spray used to produce washed pavers

 

Chamfered Pavers

Chamfering is a process where an angled edge is cut on the paver. This could be done on any one, or all of the edges.

Chamfer grinder used to produce chamfered pavers

 

Calibrated Pavers

Calibration is a process whereby the bottom of a paver is cut with a diamond tipped blade in order to create a thickness which is dimensionally accurate and consistent.

It is almost impossible to manufacture large pavers and maintain accurate and consistent heights. The SANS height variance specification on  large pavers is ±5mm.  This could result in a 10mm variance between two adjacent pavers which are however still within the specified range.

All large paving stones should be calibrated prior to resale.

Size grinder used for the calibration of pavers

 

Contact Us

Head Office
Cnr Cresset and Musket Roads
Midrand Industrial Park
Phone: 011 310 1176
Email: info@bosun.co.za