Kingscote Streets Upgrades - Kangaroo Island Council

• retains aggregate after application to provide skid resistance and prevent water from entering
and weakening the pavement;
• has a surface texture to optimise contact between the road surface and tyres and provide a skid
resistant surface.
7.4.2 Acceptance of Surface Condition
Prior to commencing sprayed sealing work the Contractor shall make an inspection to determine any
pavement defects that could adversely affect the quality of the finished work. Sprayed sealing work
shall not proceed until defects have been corrected or agreement reached with the Superintendent
of any recorded defects.
7.4.3 Environmental Risk
The Contractor shall assess the risk of environmental damage to adjacent watercourses prior to the
application or Primer, Primer-binder and Binder. The Contractor shall use the AAPA HS&E guide
No. 8 “Guidelines for environmental management when spraying bituminous materials”.
7.4.4 Preparation of Granular Base for Priming or Primer-Sealing
Priming or Primer-sealing shall not be commenced until the moisture content of the underlying
granular base material is less than 60% of OMC.
The finished surface of the base material underlying Prime or Primer-seal shall be compacted using
steel-wheeled and multi-wheel pneumatic tyred rollers to provide hard tight mosaic finish suitable for
spray sealing, to achieve the hardness specified in the spray seal design.
The finished shape of the underlying base material shall be in accordance with the project
tolerances and ride-ability requirements.
7.4.5 Preparation of Pavement Surface
Before the application of primer, primer binder or binder, the pavement surface shall be swept by the
use of a rotary broom or suction broom to provide a uniformly clean surface. If necessary, additional
sweeping shall be done by hand, using stiff brooms. Steel brooms shall not be used.
Sweeping shall extend at least 300 mm beyond each edge of the area to be sprayed.
Adherent patches of foreign material shall be removed from the surface of the pavement. Existing
raised pavement markers shall be removed.
7.4.6 Protection of Service Top Stones and Road Side Features
The Contractor shall ensure that the binder, aggregate and other material used for the works shall
be prevented from entering or adhering to gratings and top-stones, kerb and gutter, valley drains,
and other fixtures.
7.4.7 Preparation of Aggregate
The aggregate pre-coating agent shall be applied to the aggregate in a manner and at a rate and
time which will provide a complete, light, uniform, effective cover of all aggregate particles at the
time of spreading.
Pre-coat may be applied at the quarry or on site. Pre-coated aggregate may be stockpiled, for a
maximum of one month prior to use. Pre-coated stockpiles must be protected by measures to
ensure that contamination by deleterious materials or dust does not occur to the pre-coated
aggregate.
7.4.8 Plant and Equipment
A mechanical sprayer shall be used to apply primer, primer-binder and binder and shall be capable
of achieving uniform spread rates. The sprayer shall have a current sprayer certificate issued by a
NATA accredited testing authority or State Road Authority.
Ref No. 20120236SA1 Kingscote Streets Upgrades Technical Specification 32