This product range includes base and sub-base materials that provide the supporting structure in pavement design. It is made from crushed parent rock as well as from partially weathered material.
SANS 1200-M and Colto requirements state that the aggregate for bases and sub-bases should be derived from hard, sound and durable rock.
Approved target gradings are determined by laying a trial section using material complying with grading limits given in the table below. Prior to compaction, six samples of the material in situ are taken and subjected to grading analysis. The resultant (smoothed) grading curve is then classified as the approved target grading for that project and all future grading results
are evaluated against this target.
Note: Approved target gradings are not used by AfriSam to produce product.
Colto requirements recommend the following on site:
For quartzite, tillite, shale and G1 to G4 materials, measure the soluble salts against pH or electrical conductivity.
For natural gravel and other crushed aggregate, use the material if the electrical conductivity (EC) is 0,15 Smˉ1, but pay particular attention to design and construction if the pH = 6,0.
The hardness and particle shape of aggregate used in road layer works is important as these influence the workability, compaction and density achieved.
Small truck minimum is 6m³ = 8 tonnes
Small truck 10m³ = 14 tonnes
Medium truck 14m³ = 20 tonnes
Large truck 20m³ = 30 tonnes
You can get in touch with us, using:
AfriSam Customer Service (Head Office) & General Enquiries
Tel: 0860 141 141 / 011 670 5500
Email: [email protected]
Tel: 011 670 5666
Tel: 0800 313 151 / 031 460 9000
Tel: 021 521 6000
Our high quality aggregate is used in asphalt pavements and road surfacing.
This material covers a wide range of specifically graded products for use in all concrete applications. Concrete aggregates may need to be assessed and correct sampling is important for valid results.
Used in the production of the surface layer of road construction, surfacing aggregates are usually applied by chip spreaders.