Hot Rolled Asphalt and Asphalt Concrete (Macadam) - Ministry of ...

Specification 12 Hot Rolled Asphalt and Macadam Appendix Z – Guidance Notes on the Preparation
for Airfields of Job Specifications
Z.11.2 The choice of whether to cover over or
ramp around manholes and aviation ground
lighting fixtures will depend upon, respectively:
• the services located in the manhole and the
importance of maintaining immediate access to
them; and
• the needs of the Aerodrome to maintain all
ground lighting fixtures operational.
Agreement should be sought with the Aerodrome
Authority/Station staff.
Z.11.3 Typical values that can be used in sub-
Clauses 7.23.4 to 7.23.6 subject to agreement
with the Aerodrome Authority/Station staff are as
given in Table Z.5.
Z.12 ROUTINE TESTING
Routine testing of designed Hot Rolled Asphalt for
air voids content and of binder course Asphalt
Concrete (Macadam) for percentage refusal
density throughout the construction period may be
omitted for small works only.
Z.13 TEMPERATURE OF SURFACING
In assessing the temperature of the freshly laid
surfacing, consideration should be given to the
likelihood of the temperature at depth being
TABLE Z.5 TYPICAL VALUES FOR TEMPORARY RAMPS
Distance from runway centre line:
Limit of applicability of Sub-Clause
Minimum for transverse ramps
Maximum longitudinal gradient
Maximum transverse gradient
Minimum spacing of ramps
Min. thickness of ramp material
Maximum depth of ramp
greater than that at the surface. If the
temperature is required to be taken, a hole should
be drilled 40 mm deep, a measurement device
with suitable accuracy (± 1°C) inserted and the
hole filled with glycerine. The temperature should
be determined after the reading has stabilised
whilst at different depths.
Z.14 REGULARITY FOR TAKING CORE
SAMPLES
The regularity for taking cores for monitoring
should be a minimum of one every 1000 m². For
small works, the regularity may have to be
increased to obtain sufficient results to make an
assessment on.
Z.15 METEOROLOGICAL DATA
In deciding whether to offer meteorological data
about the site, the ease of availability of the data
and the possible usefulness of the data (in terms
of the expected season when the work is to be
carried out and the size of the works) need to be
considered.
Sub-Clause 7.23.4 Sub-Clause 7.23.5 Sub-Clause 7.23.6
22.5 m
10.0 m
1.0 % *
2.0 %
110 m
40 mm
75 mm
22.5 m
†
2.0 % *
2.5 %
†
40 mm
†
July 2010 53
n/a
n/a
2.0 % *
2.5 %
* If the existing longitudinal gradient is at, or close to, the maximum permissible in the standard criterion
then, depending on the direction of working, it may be necessary to obtain dispensation from the
Aerodrome Authority/Station staff to increase this value for temporary ramps.
† Not normally applicable, but otherwise to be agreed with the Aerodrome Authority/Station staff on a job
specific basis.
n/a
n/a
n/a