Services
Patching
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long as there is Asphalt, there will be a need to patch it. C & R
offers any and all forms of patch work. We were the 1st (and to our
knowledge, still the only) company in Lexington to offer Infrared Patching
technology. This rehabilitation method is used for areas of severely damaged pavement that needs to be removed before the pavement is replaced or repaired. These areas should be
Saw Cut Removal Specs.
Infrared Specs.
Skin Patching
Key Way Patching
Before and After Shots
If the pavement failure is in the area of existing parking stalls, light duty repairs are probably called for.
Light duty repairs for car parking and light traffic require removal to a depth of approximately six inches, or until stabilized subsoil is reached. The new base should include three to four inches of aggregate that is compacted with a two-ton to four-ton roller. Small areas can be compacted with a plate compactor.
Once the new base cut is compacted, vertical saw cut surfaces should be cleaned, then tack oiled for adhesion. Then the area should be filled with roughly 2.5 inches of hot mix asphalt, which can then be compacted.
The finished patched surface should be 1/8" above the surrounding pavement surface after compaction.
If the pavement repair is in an area that receives heavy truck traffic, it should receive a heavy duty repair. Heavy duty repairs should also be cut 1 foot beyond the deteriorated pavement. The area should be removed to a depth of approximately 10 inches or until a stable subsoil is reached. A new crushed stone base should be installed to a minimum depth of 6 inches. This new base should be moist when placed and compacted using a roller with the static weight of not less than three tons. In severe cases 4 - 6 inches of concrete may be used in place of rock.
Vertical saw cut surfaces should be cleaned and tack coated as in the previous procedure, and 2.5 inches of a coarse binder asphalt, which serves as an intermediate layer between the aggregate and the surface layer, should be installed and compacted with a two-ton to a four-ton roller.
Once this intermediate layer is compacted, install two inches of a finer hot mix as a surface or wearing coarse; roll and compact. The final surface should be 1/8" inch above the surrounding surface.
These specifications for light and heavy duty repairs are basic guidelines that are flexible. They are should be adjusted for the specific needs of the job. A trucking terminal or the rear of a major shopping center, for example, might require eight inches of base, four inches of a coarser asphalt pavement, plus two inches of the finer hotmix for a wearing coarse. In that case the initial hole would have to be 14 inches deep to accommodate the necessary base and asphalt pavement.
C & R is pleased to introduce infrared asphalt patching as another one of our quality services. Infrared patching is the latest technological breakthrough in asphalt patching. To our knowledge we are the only company in the area that offers this service.
Infrared works by burning propane with a mixture of forced oxygen to increase heat. In turn this extreme heat is absorbed by a patented ceramic blanket that when heated emits approximately 18,500 BTU's per square foot. In around 7 minutes the blanket will heat the asphalt to 350 degrees 2" deep in an area as large as 48 square feet. The infrared heat will not burn the asphalt therefore, the result is asphalt equivalent to fresh plant mix. Obviously, if you have a pot hole some asphalt will need to be added to fill that area but once the two are raked together you can't tell the difference.
ADVANTAGES OF INFRARED PATCHING:
1. You end up with a seamless patch. The edges fuse or weld together during compaction because there is no cold joint to butt up to.
2. The
3. Unsightly raveling edges that create trip hazards are eliminated.
4. The entire process is cost effective compared to saw cutting and removing the area and it does a better job.
5. The Asphalt Reclaiming Box that also works from the Infrared heat allows us to be the only contractor who can apply regular asphalt in the winter season when the asphalt plants are closed.
PROPER APPLICATIONS OF INFRARED PATCHING:
1. Pot hole repair: with additional asphalt the process fuses the entire area together for a longer life patch.
2. High spots: easily removed by heating the area. No cutting involved.
3. Low areas: can be leveled and fused with other asphalt.
4. Joints and overlaps: joints in pavement or over laps from partial overlays can be blended in and eliminated.
5. Oil spot removal: oil is burnt off in heating process asphalt is raked and recompacted for a perfect patch.
6. Alligator cracked areas: can be heated, asphalt added if needed, raked,
recompacted. No high cost tear out or ineffective skim coats.
7. Speed Bumps can be fused to existing pavement to eliminate tires, snow plows, etc. from popping them loose.
INAPPROPRIATE APPLICATIONS:
1. Areas that are pumping heavy mud and/or water.
2. Areas with inappropriate base beneath the asphalt.
3. Areas where pavement is too thin (less than 2" before hitting rock.
4. Areas where pavement has completely failed and a full overlay is needed.
We feel this process will help us to better serve you. The process is a proven more efficient, longer lasting, cost effective way of patching asphalt.
What is "skin patching" ?
Light or skin patches are patches generally 1" or less in thickness. Sometimes skin patches are used to fill depressions, in which case the patch could be as thick as three or four inches. A skin patch differs from removal and replacement because existing asphalt is not removed during skin patching. This type of repair should only be used when there is no base failure, to achieve drainage or for a low budget short term "Quick Fix".
Skin patches generally use a fine sand aggregate as opposed to coarse aggregate because the edges of the patch are "feathered" out to zero thickness.
Usually skin patched are used to improve the appearance of pavement or stop water penetration.
Key Way Patching can be done in large areas where there is not enough base failure to justify Saw Cut and Removal and Replacement.
In Key Way Patching the edge of the patch is milled approx. 2' wide and 1" deep. The patch is installed from 1 - 1 1/2" in depth and compacted. The Key Way makes for a "flush" joint with the old asphalt. No Lip means no raveling like skin patches.
Key Patching falls between the Skin Patching and Saw Cut and Removal. It's better than Skin Patching in most cases but not as effective as Saw Cut and Removal. The price will also be reflected as filling in between the 2 as well having more material and milling labor than Skin Patching but still not to the extend of Saw Cut and Removal in either case.
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