Slurry seal consists of a carefully designed mixture of asphalt emulsion (which may be polymer-modified), mineral aggregate, water and additives; proportioned, mixed and uniformly spread over a properly prepared surface at a single stone thickness. Slurry seal is applied as a homogenous mat which adheres firmly to the prepared surface and has a skid- resistant texture throughout its service life. Slurry seal is a quick-traffic system that allows traffic to return shortly (from one to four hours) after placement.
Slurry seal is typically performed by a truck-mounted paver, but can be placed with a continuous paver to minimize construction joints.
CRACK SEAL + SLURRY SEAL: When cracks in the existing surface exceed 1/4 inch (0.6 CM) in width, crack sealing them in advance of slurry seal will help keep water from intruding deeper into the pavement structure after the cracks reflect through the new wearing surface.
Many pavement managers use a ⅛ inch (0.3 cm) rule-of-thumb, rather than ¼ inch (0.6 cm) rule of thumb when examining crack width in the possible application of crack seal + slurry seal.
CAPE SEAL (CHIP SEAL + SLURRY SEAL): For existing asphalt pavements with more extensive cracking than would be optimal for slurry seal alone, the chip seal application before slurry seal acts as a stress-absorbing interlayer more thoroughly sealing cracks and delaying the return of reflective cracking.
SCRUB CAPE SEAL (SCRUB SEAL + SLURRY SEAL): Utilizing a scrub seal broom behind the asphalt distributor during the chip seal phase of a cape seal project helps to force more of the chip seal emulsion into the existing cracks further delaying reflective cracking.
Some agencies also opt for a Cape Seal in lieu of a stand-alone Chip Seal in more heavily populated areas to provide a smoother texture finish wearing surface than the Chip Seal alone can provide.