| Repaving a Residential Driveway |
| An asphalt driveway is repaved. |
From "Trade School"
episode DTRS-307 |
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In this segment, Jeremy Nobles learns under instructor Brian Blythe as he continues his quest towards a foreman position.
Moving beyond preventive maintenance, Jeremy tackles his first total removal and repave project on a deteriorating, 20 year-old driveway (figure A).1. After snapping a chalk line between the driveway and the street as a guideline, Jeremy begins by carefully saw-cutting through the asphalt and into the underlying sub-grade (figure B). 2. With the boundaries clearly formed, Jeremy operates a skid loader to remove the bulk of the old asphalt. With the aid of the loader's bucket, he breaks the asphalt into manageable chunks (figure C), and then hauls them to a dump truck for later recycling.
3. Once the asphalt is removed, Jeremy uses the loader bucket once again to spread and smooth over the now exposed sub-grade.4. Jeremy compacts the exposed sub-grade giving the new layers of asphalt a firm base. First he uses a hand-guided sub-compactor around the inside edges to prevent damaging the adjacent concrete (figure D). He follows this by running a roller over the majority of the sub-grade (figure E).
5. With the sub-grade compacted, Jeremy prepares for the new asphalt by dabbing a tack adhesive along the boundaries with a broom (figure F). This helps to create a strong watertight bond between the cut edges and the soon to be paved asphalt.6. Jeremy learns to operate a screed mounted onto the back of an asphalt paver (figure G). For large areas, speed is key in spreading the asphalt before it cools, and utilizing an asphalt paver helps create efficient even layers called "lifts".
7. For the first lift, which needs to provide durability, Jeremy loads the paver with asphalt mixed with a coarse aggregate. As the paver passes over the sub-grade, Jeremy manipulates the screed's hand crank—controlling both the flow of asphalt and the width of the layer (figure H). Following along closely, other crewmembers rake the asphalt to give it an even surface.8. With the first layer of asphalt laid, Jeremy uses the smaller sub-compactor to compact the edges of the lift, and the larger roller to compact the inner area (figure I).
9. After laying down a second layer of asphalt, Jeremy joins the crew and learns the proper technique in raking the asphalt. Although it seems basic, properly raking the heavy asphalt is crucial for the final appearance. Using both sides of the rake, one pronged and one flat, Jeremy scrapes the asphalt to the edges. Note: For compaction purposes, the asphalt is laid higher than the adjacent material. To form seamless edges, he makes sure to separate and remove the larger asphalt pebbles leaving the finer ones, which makes for a smoother finish (figure J).10. After compacting the asphalt flush with the surrounding material, Brian verifies a job well done by checking his work with a level (figure K).
It's a success, and Jeremy moves one step closer to becoming an asphalt-paving foreman.
RESOURCES :
Rocky Mountain Pavement Inc.
Website: www.rockymountainpavement.com
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