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
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Generally the application rate will be 1.4 l/m5.<br />
The cover aggregate shall be spread at a rate approved by the Engineer. Generally <strong>for</strong> 7mm nominal<br />
aggregate the application rate will be 110m 2 /m 3 .<br />
After the completed base course has been approved <strong>and</strong> any deficiencies corrected it shall be<br />
broomed clean <strong>of</strong> all loose materials <strong>and</strong> dust without damaging the surface.<br />
Immediately be<strong>for</strong>e the application <strong>of</strong> a bitumen emulsion binder, the base course shall be slightly<br />
dampened to ensure proper penetration <strong>and</strong> coverage.<br />
R4.2.2 Final Seal<br />
The grade <strong>and</strong> application rate <strong>of</strong> the binder shall be in accordance with the appropriate seal design<br />
<strong>and</strong> confirmed by the Contractor after inspection <strong>of</strong> the completed primer seal.<br />
Generally the binder will be hot bitumen fluxed with 1% diesel fuel <strong>and</strong> contain 0.1% adhesion adent.<br />
Generally the application rate will be 1.50 l/m5.<br />
The cover aggregate shall be spread at a rate approved by the Engineer. Generally <strong>for</strong> 14mm<br />
nominate aggregate the application rate will be 80m5/m;.<br />
Prior to sealing, the primer seal shall be broomed clean <strong>of</strong> all loose materials <strong>and</strong> any defects or<br />
irregularities corrected to the satisfaction <strong>of</strong> the Engineer.<br />
R4.2.3 Two Coat Bitumen Emulsion Seal<br />
The grade <strong>and</strong> application rate <strong>of</strong> the binder shall be inaccordance with the appropriate seal design<br />
<strong>and</strong> confirmed by the Contractor after the inspection <strong>of</strong> the completed base course. Generally the<br />
binder will be Cationic RS.1<br />
Generally the application rate <strong>for</strong> the first coat will be 1.1 l/m5 <strong>and</strong> <strong>for</strong> the second coat will be 1.9 l/m5.<br />
The cover aggregate shall be spread immediately following application <strong>of</strong> the binder. Generally the<br />
first coat will be 14mm aggregate at an application rate <strong>of</strong> 80m5/m; <strong>and</strong> the second coat will be 7mm<br />
aggregate at an application rate <strong>of</strong> 110m5/m;.<br />
After the completed base course has been approved <strong>and</strong> any deficiencies corrected it shall be<br />
broomed clean <strong>of</strong> all loose materials <strong>and</strong> dust without damaging the surface.<br />
Immediately be<strong>for</strong>e the application <strong>of</strong> the binder the base course shall be slightly dampened to ensure<br />
proper penetration <strong>and</strong> coverage.<br />
The first coat shall be rolled <strong>and</strong> lightly drag broomed <strong>and</strong> the emulsion allowed to >break= be<strong>for</strong>e the<br />
second coat is applied. Both coats shall be completed in the same establishment.<br />
R4.2.4 Spraying<br />
The binder shall be sprayed directly from a spraying unit having a current test certificate issued by<br />
Main Roads Western Australia.<br />
Specification <strong>for</strong> Subdivision Construction <strong>of</strong> Road Works <strong>and</strong> Drainage<br />
Rev. 1 – February 2013<br />
32
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