The
temperature of bituminous materials when mixed, delivered
and laid is very important, in particular the dense macadam
and asphalt. On-site checks are made by checking the
delivery note and using a thermometer.
Quality control procedures should be in place on-site to
ensure that the material is of the correct specification and
temperature. Tonnages ordered should be checked against the
weighbridge note where supplied by the carrier
Prior to laying the material should be 'turned over' to
ensure that the material is fully mixed.
The use of a hot box or heated vehicle bed should also be
considered for long duration jobs or if the material is
expected to sit for long periods. |
| Mixture
type, binder and grade |
Minimum
delivery temperature
(°C) |
Minimum
rolling temperature
(°C) |
| Bituminous
materials |
|
| Close graded /
dense 100s/200s |
75 |
50 |
| Close graded /
dense 300 pen |
100 |
80 |
| Close graded /
dense 200 pen |
110 |
85 |
| Close graded /
dense 100 pen |
120 |
95 |
| Open / medium
grade 50s |
N/A |
N/A |
| Open / medium
grade 100 / 200s |
60 |
40 |
| Open / medium
grade 300 pen |
85 |
65 |
| Open / medium
grade 200 pen |
95 |
75 |
| Pervious macadam
100 / 200 pen |
110 |
85 |
|
| Tar Macadams |
|
| Close graded /
dense C30 / C34 mix |
50 |
30 |
| Close graded /
dense C38 / C42 mix |
60 |
40 |
| Close graded /
dense C50 / 54 mix |
80 |
60 |
| Close graded /
dense C58 |
90 |
70 |
| Open / medium
graded C30 / C34 |
50 |
30 |
| Open / medium
graded C38 / C42 |
60 |
40 |
| Open / medium
graded C46 |
60 |
40 |
Pen = Penetration value of
bitumen (a measure of stiffness)
C = Design mix as specified in
Dpt Clauses
|
