Build tolerance
The road and footpath build shall comply with the following tolerances:
Air voids of compacted bituminous materials
|
Material |
Air Voids Normal Range |
Air Voids Absolute Max |
|---|---|---|
|
Footway Dense Binder Course |
2 – 10% |
12% |
|
Footway Dense Surface Course |
2 – 10% |
12% |
|
Carriageway Dense Binder Course |
2 – 8% |
10% |
|
Carriageway Dense Surface Course |
2 – 10% |
12% |
|
Carriageway Hot Rolled Asphalt |
2 – 6% |
8% |
Tolerances on surface levels for pavement courses
|
Course |
Tolerance from specified levels (mm) |
|---|---|
|
Sub-base |
+ 10 / - 30 |
|
Binder Course |
+ / - 6 |
|
Block Paving Laying Course |
+ / - 6 |
|
Surface Course |
+ / - 6 |
Tolerances for layer thicknesses for pavement courses
|
Course |
Tolerance from specified levels (mm) |
|---|---|
|
Sub-base |
+ 40 / - 0 |
|
Binder Course |
+ / - 6 |
|
Block Paving Laying Course |
+ / - 6 |
|
Surface Course |
+ / - 6 |
Maximum allowable surface irregularity tolerances using the TRL Rolling Straight Edge
|
Surface Course Irregularity (mm) |
4 |
4 |
7 |
7 |
|---|---|---|---|---|
|
Traverse Length (m) |
300 |
75 |
300 |
75 |
|
Number of irregularities |
20 |
9 |
2 |
1 |
Maximum allowable surface irregularity tolerances using the TRL Rolling Straight Edge
|
Binder Course Irregularity (mm) |
4 |
4 |
7 |
7 |
|---|---|---|---|---|
|
Traverse Length (m) |
300 |
75 |
300 |
75 |
|
Number of irregularities |
40 |
18 |
4 |
2 |
No irregularities shall exceed 10mm.
Horizontal alignment should be determined from the edge of the road pavement surface. The edge of the road as constructed and all other parallel alignments shall be correct within a tolerance of plus/minus 13mm.
For block paving the surface shall not deviate by more than 10mm under a 3 metre straight edge. The difference in level at the joints of adjacent paving units shall not exceed 2mm.
Texture depth for hot rolled asphalt shall be measured using the WDM Ltd Texture Meter 2 (TM2) to determine the average Sensor Measured Texture Depth (TM2 SMTD). Measurements shall be taken over one or more sections of road lane 50m in length, or the complete road lane if less than 50m. The minimum length shall be 10m. The average texture depth for any section of Rolled Asphalt Surface Course shall be in the range of 0.75mm to 1.30mm (TM2 SMTD) throughout the maintenance period.
Cold weather working
Material in a frozen condition shall not be used in building the new road or footpath and shall not be laid on any surface which is frozen or covered in ice or snow.
Bituminous material shall not be laid on a surface of 2ºC or below and hot rolled asphalt shall not be laid on a surface of 5ºC or below.
Concrete material shall not be used below 3ºC, and mixing shall not be carried out when the still air temperature in the shade is below 3ºC. Precautions shall be taken to ensure that the temperature of the concrete is maintained above 4ºC until it has hardened.