Pay Item
Pay Unit
Measure to the Nearest
Pay to the Nearest
Plant Mix (Commercial)
TON [t]
0.05 ton [0.05 t]
0.05TON [0.05 t]
295
Tack Coat
407.1DESCRIPTION
1 This section describes preparing and coating an existing bituminous or concrete surface
with emulsified asphalt.
407.2MATERIALS
1 Use emulsions SS-1, CSS-1, SS-1h, or CSS-1h. Provide materials in accordance with the
following: Materials
Subsection
Emulsified Asphalt Water
804.3 814
407.3EQUIPMENT
1 Equip tank trucks delivering emulsified asphalt to the project and on-site storage tanks with
a sampling valve similar in design to those shown in AASHTO T 40. Mount the valve on the truck or tank’s discharge line. Consult the Materials Testing Manual for drawings of suggested mountings.
Provide an asphalt distributor that is equipped, maintained, and operated to apply bituminous material uniformly at variable widths. Equip with a tachometer, pressure gauges, accurate volume measuring devices or a calibrated tank, a thermometer for measuring temperatures of tank contents, a power unit for the pump, full circulation spray bars capable of being adjusted laterally and vertically, and a positive cut-off for the spray bars.
407.4CONSTRUCTION
407.4.1 Surface Preparation
1 Clean the surface of extraneous material including vegetation, dirt, mud, and loose
material. Clean edges of existing pavements that will border new pavement to allow adhesion of tack coat. Obtain the engineer’s approval before applying the tack coat. 407.4.2 Sampling Procedures 1 Notify the
supplier that undiluted emulsified asphalt samples are required for each conveyance of 5 tons [5 t] or more at the time of loading. The department requires the supplier to collect 1 qt [1 L] samples in wide-mouth high-density polyethylene (HDPE) plastic containers (3⅝ in [90 mm] outside diameter with 3 in [75 mm] inside diameter
296
Tack Coat