Dense Grade Asphalt Perth
Quality Manufacture of Dense Grade Asphalt in Perth
At Roads 2000, we produce dense graded asphalt or Asphaltic Concrete (AC) at our two mixing plants located in Perth. Dense grade asphalt is a continuously graded mixture of coarse and fine aggregates, mineral filler and bitumen. It is delivered, laid and compacted while hot.
Our grade of dense asphalts is capable of producing and laying mixes with maximum stone sizes from 20mm to 7mm.
Dense grade asphalts are generally used for highways, main, industrial and distributor roads as they require a stiffer dense grade of asphalt to compensate for the increased traffic loading.
We follow the IPWEA/AAPA Technical Specification for Supply and Laying of Hot Asphalt Road Surfacing (Rev 3) when choosing the appropriate dense grade asphalt design for your project.
Roads 2000 uses Class 320 bitumen exclusively for all dense grade asphalts installation projects in Perth. This ensures that issues related to “soft” asphalts eg flushing, scuffing and shoving are minimised.
Dense Grade Asphalt Laying Process
When laying dense grade asphalts, it is recommended that layer thicknesses are between 2.5x the stone size and no greater than 5x the stone size. For example, 10AC should be no thinner than 25mm or thicker than 50mm.
When laying multi-layer asphalts, the previous layer must be allowed to cool below 40°C. Compaction should then be applied by a steel roller initially and back rolled with a rubber-tyred roller.
If a dense-graded asphalt surface is to be opened to the traffic immediately, it is recommended that sand be spread lightly on the surface to minimise scuffing while the asphalt is still hot. The slippery surface must be signposted with the appropriate warning signage.
In areas where there are significant braking and turning movements and/or increased commercial traffic, it is recommended that “intersection” mixes are used or stiffer and/or modified bitumen binders within the mix design.
Roads 2000 can provide advice to clients on the mix designs where required.
Contact Us For Dense Grade Asphalt in Perth
- IPWEA/AAPA Technical Specification, Tender Form and Schedule for Supply and Laying of Hot Asphalt Road Surfacing (Rev 3, April 2002)
- AAPA Fundamentals of Bituminous Surfacing (2010)