F. SURFACE PREPARATION
General
The area to be resurfaced shall be thoroughly cleaned of vegetation, loose aggregate and soil,
particularly soil that is bound to the surface. Manholes, valve boxes and other service entrances
will be protected from the surfacing material with polyethylene sheeting. All services will be
uncovered upon completion of work.
Cracks in Surface
If required by the Engineer, pre-treat the cracks in the surface with a fiberized crack sealer prior
to the application of the micro-surfacing. Crack sealer shall be a polymer and crumb rubber
modified asphalt cement including not less than 3% polymers, 7% recycled tire crumb rubber (80
mesh), and 8% polyester fibers (PCRM + fibers). The modified asphalt cement incorporated in
the PCRM + fibers material must meet PG 64-28E MSCR testing requirements.
Tack Coat
The contractor shall be required to apply a tack coat on any heavily oxidized pavements, and on
high traffic roadways as directed by the Engineer. The tack coat shall consist of one part
emulsified asphalt (CSS-1H) and three parts water, and be applied with a distributor at a rate of
0.05-0.10 gallons per square yard.
G. CONSTRUCTION
Stockpile
Precautions shall be taken to insure that aggregate stockpiles do not become contaminated. The
mineral aggregate shall be re-screened prior to being directly loaded onto micro-surfacing
equipment.
General
The surface should be pre-wetted by fogging ahead of the spreader box when required by surface
and ambient conditions. The rate of application of the fog spray shall be adjusted during the day
to suit temperatures, surface texture, humidity, and dryness of the pavement surface.
The micro-surfacing mixture shall be of the desired consistency upon leaving the mixer and no
additional materials should be added. A sufficient amount of material shall be carried in all parts
of the spreader at all times so that a complete coverage is obtained. Overloading of the spreader
shall be avoided. No lumping, balling, or unmixed aggregate shall be permitted.
No streaks, such as those caused by oversized aggregate, will be left in the finished surface. If
excessive amounts of oversized aggregates appear in the mix, the job will be stopped until the
contractor proves to the Engineer that the situation has been corrected.
10
