Road Repairs in Kimberly Crossing Completed Friday May 1, 2020
What we have found in 2020:
Kimberly Crossing roads were constructed 14 years ago with 5-6 inches of asphalt over what appears to be a minimal to no aggregate base/sub-base. We have found that the previous crack repairs and seal coating completed three years ago were not effective in controlling water migration to the underside of the asphalt roadway. Core sampling (just prior to repairs) will confirm variances; important for future decisions.
Currently, large 2-4” transverse and ½” to 2” curb cracks have been diverting water to the underside of the asphalt. That water travels under the asphalt and over the subgrade and pumps out (over several days to weeks) at lower cracks, curb sides and road crowns. As a result, our asphalt pavement service life is significantly lowered by constant underside water contact resulting in subgrade washout, settling and asphalt degradation.
What we plan to do in 2020:
Initial road repairs to mitigate accelerated pavement degradation are scheduled to start at Savannah Lane, Kristy Drive (North) and Harvest Lane within 3 weeks of project award. Repairs will be completed within 1 week. The project will start on Wednesday, April 29, 2020 (see map below):
We will utilize the following process:
- Take 1-2 core samples at each transverse crack indicated in red (above), prior to milling.
- Transverse Crack Asphalt Repairs
- Mill out old asphalt 2 feet wide by 2 inches deep.
- Remove millings from area to be patched.
- Fill cracks with hot pour crack sealant after they are milled.
- Apply tack coat and install NW-75 fabric.
- Install 2 inches of hot mix asphalt and compact.
- Remove all debris associated with work performed.
- Sealcoating & Crack Sealing
- Clean out border joints with brooms, grazer, and high pressure blowers.
- Install hot pour crack sealant in border joints.
- Continue with remaining Kimberly Crossing Roads in 9-12 months
- Evaluate effectiveness of initial repairs over time.
- Continue with or modify the work scope.
The contractor will have to work on the whole width of the road, but they will leave one side available for traffic to slowly drive through (over a 2” bump) for 90% of the timeline. When the asphalt arrives, there will be a 10-20 minute window that the road will be shut down for each patch, while the asphalt in the first lane cools down.
Good asphalt road construction.
Typical aggregate sub-base under asphalt serves to support the roadway and drain away water.
What to Expect:
The hot mix asphalt will be black in color and then gray out over the next 6 months. The repair area will become noticeably lighter than the surrounding seal coated areas. After completion of all road repairs, we can add new seal coat over the patch areas. This will also improve the match to our existing roadway.
The existing pavement will continue to shrink and cracks grow or appear. This will occur at a calculated rate of ¼ to ⅓ inch per year per 100′ length and width, resulting in additional cracks and ongoing repairs over time. Because we have little to no crushed stone drainage capability under our roads, we will need to make more frequent repairs.
Member at Large
Kimberly Crossing HOA