Slurry Seal is a cold mix asphalt resurfacing treatment made up of an aggregate, a special liquid asphalt emulsion, water and cement. These ingredients are mixed at a specifically calibrated rate with either a truck-mounted self-contained mixing unit or a continuous run machine with multiple support units.
This is not a typical pavement sealer, it is an actual cold mix asphalt pavement.
A Slurry Seal is designed to be installed from 1/4-inch to 3/8-inch thick on existing pavements. A Slurry Seal maintains excellent bonding and adhesion qualities and is approved by nearly all departments of transportation agencies including PennDOT.
Shown left, a sample of slurry seal at the proper thickness of 1/4” Shown right, a closer view relative to the size of a nickel. Note the size of the stone in the cross section sample and the coarse skid resistant surface on the sample on the left.
With an approximate cost that is one third of the cost of a typical mill and pave job which has the recommended minimum thickness of 1 1/2 inches, a 1/4-inch treatment of a slurry seal rarely conflicts with existing structures and provides an actual new pavement surface that exhibits a skid resistance level that is one of the highest achievable using any type of paving material. Slurry Seal has a cure time of three to five hours, which is similar to a pavement sealer.
When combined with the proper preparatory work such as crack filling larger cracks, patching potholes or base failure areas, an application of a Slurry Seal at the correct time in a pavement's lifetime can extend the usable surface life of the pavement for years to come.
Slurry Seal is a global pavement maintenance tool utilized in over 40 countries around the world along with many states across America. It’s environmentally safer than traditional pavements. A Slurry Seal may be the most cost-effective pavement maintenance option available.
Peter J. Caruso & Sons, Inc., has been installing Slurry Seal for over 20 years on projects such as municipal roadways, school parking lots, shopping center parking lots, various commercial parking lots and cemetery roads.
Slurry Seal is not intended to replace a standard hot mix asphalt overlay. It is a surface treatment that is comparable to chip sealing or “tar and chip”, without all the loose stones and fatty tar areas which are hazardous due to loss of traction. Slurry Seal should be used as a maintenance tool to maximize the value of an existing pavement by extending the time that a more intensive repair would be required.
Due to the large area of coverage that could be completed in a day, the cost will vary with each project respectively. The unit price for a large area will be considerably less than that of a smaller area. For more detailed information on a Slurry Seal, click here to go to the International Slurry Surfacing Association’s website.
Micro-surfacing is very similar to Slurry Seal. The main differences are in the liquid asphalt emulsion, which has polymer modifiers added to accelerate curing time and to enhance durability. These properties enable micro-surfacing to be utilized in a heavy duty or higher traffic volume situation.
Micro-surfacing was developed for use on Germany’s Autobahn and is still in use as a maintenance tool in the preservation of the roadway’s pavement surface. Another benefit micro-surfacing has is its ability to be used as a leveling course or to fill rutted pavement of up to 3/4-inch prior to installing the finish course. The fast cure time enables these applications to be done right before the finish course installation.
A surface treated with micro-surfacing can be open to traffic in as little time as 45 minutes for straight traffic and one hour for turning traffic.