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REMOVAL AND REPLACEMENT
When a parking lot is poorly constructed or has completely passes its useful life, it may need total reconstruction. One of the methods typically used is removal and replacement of the pavement.
First the existing asphalt is removed and taken it to a recycling facility. If there is a layer of crushed stone, it may or may not be useable condition. The stone subgrade or dirt subgrade is tested to determine its suitability for use in reconstructing the parking lot. (Typically this would take place before final proposal is submitted so the total project cost could be calculated.)
The subgrade must be brought up to proper density by use of existing materials or the additional of crushed stone or milled asphalt. Once the sub base is thoroughly compacted, a new asphalt surface would be applied typically consisting of a base course layer of 2 - 4 inches and a surface course layer of 1 - 2 inches. Specifications for reconstruction are always determined by soil conditions, anticipated traffic loading, and desired design life of the pavement factored in with budget constraints in mind.
The Process:
- Saw-cut the perimeter of the area to be replaced (if necessary).
- Excavate the deteriorated asphalt and associated sub base.
- Install French drain if the sub base is perpetually wet.
- Install new catch basin(s) if drainage needs to be significantly improved.
- Install crushed stone as necessary. Oftentimes, the milled asphalt can be used as the new crushed stone base at a much lower cost than new stone.
- Grade sub base for proper water flow.
- Compact stone base with power-driven vibratory rollers.
- Install geotextile water-resistant fabric, if necessary.
- Install two lifts of asphalt.
- Lift 1: Large aggregate base mix. Compact
- Lift 2: Small aggregate surface mix. Compact
- Lay out and paint pavement markings.
- Allow the new pavement to cure.
- Your lot is new again.
When the proper reconstruction and annual preventative maintenance steps are taken, a newly reconstructed parking lot should last decades.
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