Public Works Department
Street Rehabilitation Project - Slurry Seal
As part of the ongoing effort to maintain and upgrade City streets, the City Council has recently allocated funding for the slurry sealing of various residential and arterial streets throughout the City, as shown on this map:
Over the years, heavy traffic, water infiltration, and aging asphalt have contributed to the degradation of various streets. This slurry seal project will provide a protective coating for the streets and is designed to seal and extend the life of the pavement. Work is scheduled to begin September 2014 and finish November 2014.
The contractor will be distributing construction notices two weeks prior to construction. All parking restrictions will be posted 48-hours in advance and door hangers will be distributed to all affected residences and businesses. The day of the slurry seal, we request that you refrain from parking on the street. We also ask that you do not allow any water to run into the street until the slurry seal has dried. Please do not water your yard or wash your car during that day. Some streets will be closed entirely to traffic the day of the slurry seal. Most importantly, residents and businesses should anticipate traffic detours and limited access to their homes or businesses during certain periods.
We request that you do NOT drive on the slurry seal until it cures (about 4 hours after it is applied). Streets will be opened to traffic once the slurry has had adequate time to cure. If all goes as planned, they will be opened by 5:00 p.m. each day. It is important to note that even after streets are opened, it takes several months for the slurry to completely cure. Because of this, normal driving on recently slurried streets may cause some tire tracks (especially at the ends of cul-de-sacs), or gouges from turning wheels while your car is not moving.
For your SAFETY and the safety of your family and visitors, please stay away from equipment and construction areas. Please keep your children from harm and instruct them to stay clear of all construction activities. We appreciate your cooperation and look forward to a quick and successful project completion.
To ensure open lines of communication with businesses and residents, the City has designated a project manager and project inspector to handle all aspects of the project. To ensure quick response to your inquiries, comments, and concerns, please call:
Frequently Asked Questions
What is a slurry seal?
Slurry seal is application of asphalt mixture that costs approximately 20 times less than a 2-inch asphalt overlay and lasts approximately five to seven years. It is a mixture of asphalt emulsion, fine aggregate (sand) and water. The slurry is spread over the street existing asphalt surface at approximately 3/8” thick. The purpose of the slurry is to provide a new wearing surface and protect the asphalt underneath from water damage. The process is akin to painting wood siding on a house – it is not as permanent as new wood siding, but it helps the existing siding last longer and is far less expensive than new siding. In simple terms, slurry seal is a maintenance product that keeps costs down until a street is warranted for an asphalt overlay.
Why are there white discolored areas with sand?
This typically happens in situations of irrigation overspray or excess water in an area. The water discolors the slurry seal and brings out the cement and rock dust in the slurry mixture. Although the area may look different, the slurry seal performance will not be affected and will continue to do its job in protecting the underlying pavement from weather/moisture damage.
Why does the slurry seal appear uneven and rough?
The slurry seal is an emulsion of oil, sand, water, latex, and rock aggregates. The sand and rock aggregates give the slurry seal the texture necessary to provide vehicles with tire traction and improved safety, which is especially helpful during rain events.
Why does it look like there are seams in the slurry seal? Why isn’t it continuous all the way through?
Slurry seal is applied in passes and it typically takes several passes to slurry seal one street. In areas where passes connect, the slurry seal must be overlapped for the product to perform properly. The subject seams are the areas where the overlap is necessary.
Why can I see hairline cracks in the slurry?
Prior to slurry sealing, cracks larger than a quarter of an inch are sealed with crack sealant. Cracks smaller than a quarter-inch are sealed by the slurry seal. The slurry seal application does not provide a structure layer, as in an asphalt overlay; hence the visible propagation of existing cracks to the surface. Although some of the smaller cracks are still visible, the slurry seal performance will not be affected and will continue to do its job in protecting the underlying pavement from weather/moisture damage.
What is the process of the Slurry Seal project?
Application of slurry seal is a three step process. First, surface cracks are filled to help protect the subgrade from water infiltration. Second, for areas with greater pavement deterioration, the existing pavement is removed to a depth of 4”-6” and filled with new asphalt to provide for a stronger pavement section. Third, the slurry seal is applied over the asphalt roadway, thus completing the process. During all phases of work, driving and parking will be affected and we request that you adhere to all street postings.
Will this project affect street sweeping and trash pickup?
Street sweeping will be suspended during the slurry seal process to allow for the street to properly cure. Vehicles will not be cited on street sweeping days in the areas affected by the slurry seal project.
During the project, all work will be coordinated with the City’s trash hauler to allow for normal trash pickup operations.
How come the Slurry Seal is a light brown color and not black?
When the slurry seal is applied, it is a light brown color due to the chemical reactions and the temperature of the mix. As the mix becomes exposed to heat and sunlight, it will begin to turn black.
Over time, as water reacts with the slurry seal, the street will begin to turn gray. Also, as cars drive on the street, the asphalt begins to wear off, exposing the gray aggregate underneath. This is natural and only affects the aesthetics of the street, not the structural integrity.
What precautions should I take once my street has been slurried?
Although a street may be opened to vehicular access after the slurry seal, it actually takes several months for the slurry to completely cure. Because of this, tire tracks and gouges may appear on the street. To avoid these tire tracks, we request that you minimize making sharp turns and turning your wheels while your car is stationary. The more visible tire tracks and “power steering” marks are often caused by heavy trucks, RVs, and trash trucks. During hot days and the summer months, these tire tracks may become more prevalent, but will eventually flatten out over time as the slurry cures.