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|
The table below shows the
approximate rates of spread for macadam's
| Average
thickness of course to be laid |
Open
graded macadam |
Dense,
close, open and fine graded macadam |
| mm |
mē/tonne |
mē/tonne |
| 20 |
20 to 27 |
18 to 24 |
| 25 |
17 to 22 |
15 to 19 |
| 30 |
14 to 17 |
13 to 15 |
| 35 |
12 to 16 |
11 to 13 |
| 40 |
12 to 15 |
10 to 12 |
| 45 |
10 to 13 |
9 to 11 |
| 50 |
9 to 12 |
8 to 10 |
| 60 |
8 to 10 |
7.0 to 8.5 |
| 65 |
7 to 10 |
6.0 to 7.5 |
| 75 |
7 to 8 |
5.0 to 6.5 |
| 100 |
4.5 to 6 |
4.0 to 5.0 |
NOTES:
When laying Pre-coated chippings with
Hot Rolled Asphalt the rate of spread is approximately 1.8
kgs/mē or to match the existing surface.
Tack coat is sprayed at a spread rate
of 0.4 - 0.6 litre/mē with no ponding.
No contaminants must come into contact
with the materials, such as diesel or detergents as it will
break down the binder. The use of fine dust or sand is
permissible. A tool heater must be available to heat rakes,
shovels, etc.
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