Slurry seal is an 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 sealed?
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.
A Cape Seal is a two layered system consisting of a F.A.S.T (Fractured Aggregate Surface Treatment) and a Slurry Seal. A F.A.S.T is a an application of an asphalt binder in the form of an emulsion or hot spray applied to a layer of fractured rock.
What is the purpose of a Cape Seal?
Cape Seals provide added strength and durability to a heavily cracked and raveled roadway. It also helps to restore skid resistance and prolongs the life of your roadway. The Slurry application will provide a smooth and safe surface, while reducing the chances of reflective cracking. Though there is no way to prevent all cracking of a roadway from reflecting through, a cape seal will minimize the occurrence.
How long will this process take?
A cape seal is a two part process that requires a curing time between applications. Once the F.A.S.T is applied, it will be a minimum of 7 days before a Slurry Seal can be applied.
When can I drive on my street after each application?
Once the F.A.S.T has been applied, you can expect to be allowed back on your street within an hour.
Once the Slurry Seal has been applied you will need to remain off of the street for 5 to 7 hours while the Seal cures.
Microseal is a cold mixed asphalt seal. It consists of a graded aggregate, a binder, fines and additives. It is a hard wearing surfacing for pavement preservation and rehabilitation. It is a sort of slurry surfacing but is specialized for high volumes of traffic related to arterial and collector roadways.
Your street had HA5™ High Density Mineral Bond installed which is a pavement preservation treatment that significantly extends the life and quality of streets in desert climates. The amount of cracking and pot holes over time will be reduced.
What to expect following installation:
While HA5™ significantly extends the life and improves the condition of the pavement surface, there are some unique qualities you should be aware of. Most significant is the scuffing and marking that takes place for the first several weeks following the installation and again with higher temperatures during the first several months. THIS IS NORMAL AND WILL GO AWAY.
Slow moving and tight turning traffic will slightly scuff the HA5™, leaving marks and tracks on the pavement. Again, THESE MARKS ARE TEMPORARY AND EXPECTED. Over time, the markings on the pavement will heal themselves with regular traffic. Traffic is actually an essential part of the curing process.
What to expect following installation (long-term):
The key to effectively preserving pavement is taking action early in the pavement’s life. When HA5 is applied early in a pavement’s life, you can anticipate that your street will experience less cracking, pot holes, and other manifestations of aging pavement. Your street will also have a blacker appearance as it ages which is generally considered more aesthetically pleasing.
I have more questions - who can I call?
Please feel free to contact any of the people below for more information regarding this project.
Holbrook Asphalt: 602-307-0425
City of Goodyear:
Pavement Management Coordinator