Starting in April, Public Works begins annual road surface treatments. The county uses several different methods to preserve roads and to protect the public’s investment in its transportation infrastructure.
This surface treatment is for structural reinforcement on arterial and collector roads in both urban and rural areas. The depth of an overlay is between 1 and 4 inches. Surface defects and irregularities are repaired prior to adding a new layer of asphalt.
In some cases, an asphalt overlay involves what is known as full-depth reclamation. For these projects, the existing asphalt is pulverized. Cement and other material can be added before the surface is compacted and a new layer of asphalt is added to the structurally repaired road.
Thin lifts are a type of overlay where a 1.5 inch layer of asphalt is added to neighborhood streets that have some surface irregularities.
This surface treatment is applied to access and subdivision roads in urban areas to prevent moisture from infiltrating the subgrade. These roads are structurally sound and do not need reinforcement.
Emulsified oil and finely crushed aggregate are premixed on a truck and then applied to the road surface. This treatment requires the road be closed for one day to allow curing before it can reopen to traffic.
Rubberized asphalt cape seal
The treatment consists of two phases. In the first phase, an asphalt rubber binder, consisting of paving asphalt, oil and crumb rubber from ground-up used tires and natural rubber, is applied to the road, followed by a layer of crushed rock. The rock, which is pre-coated with an asphalt binder, is pressed into the asphalt-oil rubber mix using rollers.
The second phase, typically done 1-2 weeks later, is applying a slurry seal to further preserve the surface. This is a one-day process that requires closing the road.
Chip seal is used to help seal the surface and prevent moisture from damaging roads. This surface treatment is typically applied between mid-August and late September, weather permitting. Each area is completed within 1 - 3 days. Roads will not be closed, but you may experience temporary traffic delays. Watch for loose gravel and fresh oil signs and please drive slowly through work zones.
Micro seal is similar to a slurry seal, only that it uses larger pieces of rock. Cement also can be added to the mixture. A micro seal dries faster than a slurry seal and is used on multilane roads, which allows traffic to pass on one lane while the other is being treated. To further ease traffic disruptions, sand is shoveled onto intersections so vehicles can drive over the treated surface only minutes after it has been applied.
Note: Clark County does not have any micro seal projects scheduled for 2015.
In preparation for summer road work, residents sometimes need to prune their vegetation so county vehicles can get close to the curb. In addition, vegetation needs to be trimmed to improve traffic visibility and remove sidewalk or pedestrian obstructions.
Homeowners are responsible for pruning and maintaining their vegetation, including debris disposal. All low-hanging material needs to be trimmed to provide 14 feet of vertical clearance from the top of the curb and 8 feet of clearance from the full width of the sidewalk.
Residents who need to trim their vegetation will receive door hangers from the county. If they do not trim the vegetation, county road crews will cut back the vegetation. This work will be done at no cost, but it will not be done to a landscape quality desired by many residents.