We have noticed there is a lot of confusion when it comes to 6F2 vs 6F5. There are lots of sources that state 6F2 is a crusher run that is produced using quarried stone. Whereas 6F5 is a crusher run but is produced using recycled materials such as demolition wastes. We have also seen it the opposite way round, however, this is not the case as highlighted in the Specification for Highway Works.
Both classes are highlighted in series 600 of the Specification for Highway Works. They are described as a selected granular material with a coarse grading that is typically used for capping.
6F2’s permitted constituents are any material, or combination, which also includes recycled aggregates with no more than 50% by mass of recycled bituminous plainings and granulated asphalt but excludes material with tar and tar-bitumen binders, unburnt colliery spoil, and argillaceous rock.
If class 6F2 is imported onto the site it shall be classified as class 6F5. It does however need to comply with the requirements for 6F5. So, the main difference is that 6F2 is produced and used on the same site whereas 6F5 is produced elsewhere and imported onto the site.
6F5 does need to comply with a few different standards due to being an imported material. This is unbound material complying with BS EN 13285 containing aggregates. It then needs to conform to BS EN 13242 from one or more of the following source codes:
P – Natural aggregates (Except chalk, shale, siltstone, or slates)
A2 – Crushed concrete
A3 – Crushed bricks
A4 – Mixed recycled aggregates (No more than 50% if bituminous materials)
B1 – Municipal incinerator bottom ash (MIBA)
D2 – Air-cooled blast furnace slag
D3 – Basic oxygen furnace slag
D4 – Electric arc furnace slag (EAF C)
G – Mining and quarry industry (Except black coal shale).
They also have slightly different grading requirements:
6F2 |
6F5 |
||
| Size (mm) | Percentage by Mass Passing | Size (mm) | Percentage by Mass Passing |
|
125
|
100
|
125
|
100
|
|
90
|
80 – 100
|
80
|
75-99
|
|
75
|
65 – 100
|
40
|
50-90
|
|
37.5
|
45 – 100
|
20
|
30-75
|
|
10
|
15 – 60
|
10
|
15-60
|
|
5
|
10 – 45
|
2
|
0-35
|
|
600 (Microns)
|
0-25
|
63 (Microns)
|
0-12
|
| 63 (Microns)
|
0-12
|
||
To put it simply 6F2 is produced and used onsite whereas 6F5 is imported.
If you require quarried or recycled 6F5 material get in touch with the GMAT team on 0161 647 7409 or info@gmat.co.uk
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