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www.trentonpaving.com | Frequently Asked Questions > Steps in Driveway Construction

  1. Excavation of existing soil, clay, organic material and rocks until undisturbed sub-soil is reached.  Excavation can be as little as 50 to 100 mm with good sub-soil conditions extending to 400 or 500 mm when bad sub-soil conditions must be remedied. 

  2. Installation of a base of aggregate (crushed limestone) and subsequent compaction with a vibratory roller.  In the case of greater than 300 mm on new aggregate being required, the installation of aggregate is repeated with multiple layers of 250 mm of aggregate to ensure full compaction.  The top 200 mm aggregate should be less than 10 mm size; courses below this level are typically larger size.  Then, final grading of the aggregate to obtain desired pitch and remove any minor depressions.  Compact again.

  3. Lay the mat of Hot Asphalt Mix.  Once the foundation of aggregate is properly prepared with proper pitch and a level plane, dump trucks deliver the hot asphalt to the job site, a pad of asphalt is installed by hand at the garage sill to set depth of asphalt mat, skid steers will load the paving machine now positioned on the pad, and the paving machine makes the first `pull`down the length of the drive.  This can be repeated for drives wider than the maximum width of the paving machine.

  4. Compaction (rolling) of the mat to 90% to 95% of maximum density follows laying of an asphalt mat.  Compaction with vibratory drum rollers ensures the asphalt is achieves density and ideal strength characteristics.  Note: even greater density can be achieved but this degrades longevity of the asphalt driveway by eliminating some the flex inherent in asphalt layers and creating micro-fissures allowing water penetration.  Over-compaction is evidenced by white (bare) gravel edges showing on the surface of the new black asphalt surface.

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