4-29
409.04 Weather Limitations Bituminous material shall not be ap plied on a wet or frozen
surface, or when weather conditions are otherwise unfavorable t o proper construction procedures. Unless otherwise specified in the contract, the use of rapid se t emulsions shall be required after sunset or before sunrise, when the atmospheric t emperature is below 50°F but above 40°F in a shaded area at the job site.
409.05 Equipment The Contractor shall provide necessary equip ment to properly
and uniformly apply the bituminous material. All distributors shall be equipped with accurate volume measuri ng 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 road way 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, mainta ined 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 controll ed 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 tru ck 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 accepta ble sampling valve. On bulk delivery vehicles the valve shall be located in an acce ssible area in the lower half of the front or rear bulkhead. The valve shall be similar ly 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 bitumi nous tack coat the surface
shall be thoroughly cleaned of all loose and objectionable mate rial. 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 treat ed will be specified in the co ntract. When traffic is maintained, one-way passage of vehicles will b e maintained on the untreated portion of the roadway. Bituminous tack coat shall n ot be placed on any surface where traffic will be force d 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 t he specified amount. Skipped a reas 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 wi ll 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 ty pe 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
SECTION 410 - BITUMINOUS SURFACE TREATMENT Reserved SECTION 411 - UNTREATED AGGREGATE SURFACE COURSE
411.01 Description This work shall consist of constructing a surface course or
leveling course of untreated aggregate or crushed stone on an a pproved base in accordance with these specifications and i n reasonably close conformity wi th the lines, grades, thickness and typical cross sections shown on the plans or established.
411.02 Aggregate Aggregates for untreated aggregate surface c ourse shall conform
to the requirements of Section 703.10 - Aggregate for Untreated Surface Course and Leveling Course Type A. Aggregates for crushed stone surface shall conform to the requ irements of Section
703.12 Aggregate for Crushed Stone Surface.
411.03 Placing The surface course material shall be spread eve nly in one layer upon the
prepared base course to a depth that will insure the required d epth after being compacted.