What does a recycled asphalt base course cost in Ottawa?

Recycled asphalt base course (RAP - Reclaimed Asphalt Pavement) typically costs $18 to $28 per tonne delivered in Ottawa, making it 20 to 30 percent less expensive than virgin Granular A base material. However, RAP has specific applications and limitations that Ottawa homeowners need to understand before choosing it for their driveway project.

What is Recycled Asphalt Base Course? RAP is old asphalt pavement that has been milled up, crushed, and screened to specific gradations. It contains the original aggregate plus residual asphalt binder, which gives it some self-cementing properties when compacted. The material looks like coarse black gravel and compacts to a firm, stable base layer. Most RAP in the Ottawa market comes from municipal road reconstruction projects and highway resurfacing operations.

Appropriate Uses for RAP in Ottawa Driveways: RAP works well as a sub-base material beneath Granular A base or as the primary base layer for lighter-duty residential driveways with minimal heavy vehicle traffic. It provides excellent compaction and stability, particularly on Ottawa's clay soils where its binding properties help create a more cohesive base layer than loose granular materials. RAP is commonly used for rural driveways, cottage access roads, and as a cost-effective base upgrade for homeowners replacing failed asphalt driveways.

Ottawa Climate Considerations: RAP performs well in Ottawa's freeze-thaw conditions because the residual asphalt binder helps bind the aggregate particles together, reducing frost susceptibility compared to loose granular base. However, the material must still be placed at proper depth (minimum 300mm total base depth) and compacted in lifts to prevent frost heaving. RAP's dark colour means it absorbs more heat than light-coloured limestone, which can be beneficial for faster spring thaw but may contribute to thermal expansion in summer.

Installation Requirements: RAP must be compacted with a vibratory plate compactor or roller while the material retains some moisture. In hot weather, the residual asphalt binder softens slightly, improving compaction. The material should be placed in 150mm lifts maximum and compacted to 98 percent standard Proctor density. A thin layer (50-75mm) of Granular A base over RAP provides an ideal surface for asphalt paving and helps with final grading.

Cost Comparison for Average Ottawa Driveway (50 square metres): Using RAP as the primary base material can save $300 to $600 compared to virgin Granular A, assuming 300mm depth. However, most paving contractors prefer a Granular A surface course for final grading, so the savings are typically on the sub-base portion only. Total installed cost including delivery, spreading, and compaction runs $2.50 to $4.00 per square foot.

When to Hire a Professional: RAP base installation requires proper compaction equipment and experience with the material's handling characteristics. The residual asphalt content varies between loads, affecting compaction requirements. Professional contractors understand how to achieve proper density and can ensure the base meets structural requirements for your specific driveway loading conditions.

Need help finding a paving contractor experienced with RAP base installation? Ottawa Driveways can match you with local professionals who understand proper base preparation techniques for Ottawa's challenging climate conditions.