409Bituminous Tack Coat

409.01 Description This work consists of furnishing and apply ing one uniform

application of liquid bituminous material on an approved surface in accordance with these specifications and in reasonably close conformity with the lines shown on the plans or established.

409.02 Bituminous Material The type and grade of bituminous m aterial will be

specified in the contract. The bituminous material shall meet the applicable requirements of Section 702 - Bituminous Materials. The bituminous material may be conditionally accepted at the source. 4-29

409.04 Weather Limitations Bituminous material shall not be applied on a wet or frozen

surface, or when weather conditions are otherwise unfavorable to proper construction procedures. Unless otherwise specified in the contract, the use of rapid set emulsions shall be required after sunset or before sunrise, when the atmospheric temperature is below 50°F but above 40°F in a shaded area at the job site.

409.05 Equipment The Contractor shall provide necessary equipment to properly

and uniformly apply the bituminous material. All distributors shall be equipped with accurate volume measuring devices, or a calibrated tank and measuring stick, thermometer for measuring temperatures of tank contents, power unit for the pump, capable of full circulation, and able to heat the contents to application temperatures. Approved fog type nozzles will be required. Truck mounted distributors will be required for use on all roadway sections considered as traveled way, ramps, side roads and shoulders. Spray bars on truck mounted distributors shall be adjustable laterally and vertically. Truck mounted distributors sh all be designed, equipped, maintained and operated so that bituminous material at constant temperature may be applied uniformly on variable widths of surface up to 5 ft at readily determined and controlled rates from 0.01 to 0.5 gal/yd², with uniform pressure and with an allowable variation from any specified rate not to exceed 0.01 gal/yd². In areas not accessible to a truck mounted distributors, or if project conditions warrant, the Department may allow the use of trailer mounted pressurized tank distributors equipped with pressurized spray bars. Spray nozzles, tank pressure, and travel speed shall be adjusted to achieve proper application rate and coverage. All liquid bituminous material bulk delivery vehicles, truck m ounted distributors, or pressurized tank distributors shall be equipped with an acceptable sampling valve. On bulk delivery vehicles the valve shall be located in an accessible area in the lower half of the front or rear bulkhead. The valve shall be similarly located on distributors except that it may be installed in a circulating line having a rising flow.

409.06 Preparation of Surface before application of the bituminous tack coat the surface

shall be thoroughly cleaned of all loose and objectionable material. Preparation of the surface shall be considered incidental to the contract.

409.07 Application of Bituminous Material Bituminous material shall be applied by

a pressure distributor in a uniform, continuous spread over the area to be treated and within 4-30 the temperature range specified in Section 702.05 - Application Temperatures. The rate of application and areas to be treated will be specified in the contract. When traffic is maintained, one-way passage of vehicles will b e maintained on the untreated portion of the roadway. Bituminous tack coat shall not be placed on any surface where traffic will be forced to travel upon the uncovered tack coat. All tack coat shall be covered on the day it is applied. Care shall be taken so that the application of the bituminous tack coat at the junction of spreads is not in excess of the specified amount. Skipped areas and deficiencies shall be corrected as directed.

409.08 Method of Measurement Unless otherwise specified, bitu minous tack coat

will be measured by the gallon. All quantity determinations will be made in accordance with Section 108 - Payment.

409.09 Basis of Payment The accepted quantity of bituminous t ack coat will be paid

for at the contract unit price per gallon for the designated type of material complete in place. Payment will be made under: Pay Item P a y U n i t

409.15 Bituminous Tack Coat, Applied Gal lon

Bituminous Tack Coat in other states

• Georgia 413 · Bituminous Tack Coat
• Minnesota 2357 · Bituminous Tack Coat