PHASE II REPORT - Caltrans

covers, valve boxes). No dry aggregate, either spilled from the mixing machine or existing on
the pavement surface, will be permitted.
6.6.8 TACK COAT.
If required on the plans, a tack coat consisting of one part SS or CSS emulsion and three parts
water shall be applied with a standard distributor. The distributor shall be capable of applying
the diluted emulsion at the rate of 0.05 to 0.10 gallons/yd 2 (0.16-0.32 liters/m 2 ). The tack shall
be allowed to cure sufficiently before the application of the slurry surfacing.
6.6.9 CRACKS.
Existing cracks on the surface of the pavement shall be treated with an acceptable material well
in advance of the placement of the slurry surfacing. The surface of the crack filling material
shall be 1/8 inch (3.175 mm) below the surface of the roadway.
6.6.9.1 Handwork.
In areas where the placement equipment cannot work because of space limitations, these areas
should be surfaced using hand tools to provide a complete and uniform coverage. These areas
should be cleaned and lightly dampened before placing the mix. The finished texture shall be
uniform and have a neat appearance as nearly as possible to that produced by the spreader
box.
6.6.9.2 Application.
The surface of the pavement shall be pre-wetted by fogging ahead of the spreader box. The
rate of application shall be adjusted during the placement based on the temperature, texture of
the pavement surface, and humidity.
6.6.9.3 Clean Up.
All areas including service entrances, gutters, and intersections shall be cleaned of the slurry
surfacing on a daily basis as well as any debris associated with the placement.
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