specification for subdivision construction of road works and drainage
specification for subdivision construction of road works and drainage
specification for subdivision construction of road works and drainage
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
The material shall be placed within the <strong>for</strong>med box <strong>and</strong> spread, without unduly disturbing the subgrade,<br />
to the required pr<strong>of</strong>iles working from the centre towards the edges.<br />
The material shall be water bound, spread <strong>and</strong> compacted to a minimum dry density ratio <strong>of</strong> 95%<br />
when tested in accordance with AS1289 E2.1.<br />
The final sub-grade shall have a minimum thickness <strong>of</strong> 200mm but 400mm in Gilgai soils.<br />
The completed sub-base shall be approved by the Engineer prior to the placing <strong>of</strong> the base course.<br />
R3.3 Base<br />
The base course shall be constructed <strong>of</strong> crushed rock base to the width shown on the drawings.<br />
The base material shall be spread from an approved tipping truck in an even <strong>and</strong> continuous layer.<br />
The base material shall be watered to the optimum moisture content, graded to the required pr<strong>of</strong>ile<br />
with a minimum <strong>of</strong> cut <strong>and</strong> uni<strong>for</strong>mly compacted to a minimum dry density ratio <strong>of</strong> 98% when tested in<br />
accordance with AS1289 E2.1.<br />
Any part <strong>of</strong> the base course which is below the required level after consolidation shall be scarified to a<br />
depth <strong>of</strong> 75mm, made up with fresh base material <strong>and</strong> re-compacted.<br />
The final base course shall have a minimum thickness <strong>of</strong> 200mm <strong>and</strong> be free from bony areas <strong>and</strong><br />
thin layers <strong>of</strong> finer material.<br />
The completed base course shall be approved by the Engineer prior to the application <strong>of</strong> the primer<br />
seal.<br />
R4<br />
SURFACE COURSE<br />
R4.1 General<br />
The bituminous surfacing <strong>of</strong> <strong>road</strong>s shall be a primer seal <strong>of</strong> bitumen emulsion <strong>and</strong> 7mm aggregate<br />
<strong>and</strong> a wearing course <strong>of</strong> a dense graded 10mm size Asphalt (Hotmixed) laid to a minimum thickness<br />
<strong>of</strong> 25mm unless otherwise specified on the drawings.<br />
Intersections shall have a wearing course <strong>of</strong> dense graded 10mm size asphalt (Hot mixed)<br />
intersection mix unless otherwise specified on the drawings.<br />
The Contractor shall notify the Engineer at least 48 hours in advance <strong>of</strong> the intended sealing or<br />
surfacing <strong>works</strong> <strong>and</strong> shall submit the proposed seal design <strong>for</strong> approval.<br />
R4.2 Spray Seals<br />
R4.2.1 Primer Seal<br />
The grade <strong>and</strong> application rate <strong>of</strong> the binder shall in accordance with the appropriate seal design <strong>and</strong><br />
confirmed by the Contractor after the inspection <strong>of</strong> the completed base course. Generally the binder<br />
will be bitumen emulsion but may be cut back hot bitumen.<br />
31<br />
Specification <strong>for</strong> Subdivision Construction <strong>of</strong> Road Works <strong>and</strong> Drainage<br />
Rev. 1 – February 2013
Change language