411.03CONSTRUCTION METHODS

411.03 Construction Methods .

411.03.1 Surface Preparation. All surface preparations shall be completed prior to applying the

PPEST. All manhole covers, water boxes, catch basins and other such structures shall be adjusted prior to paving. These shall be covered and the location of each referenced for cleaning after paving. All localized depressions, ruts, trench cu ts, utility settlements and joint settlements shall be brought to grade with a Type I-2 hot mix or high performance cold patch shim course. A tack coat shall be applied to these surfaces before the shim course is placed. High spots, localized bumps and joints shall be brought to grade by milling or other treatments approved by the Engineer. The entire perimeter of the pavement on which the PPEST is to be placed shall be milled. The milled wedge shall be 3 feet wide, triangular in shape and 1-1/4 inches at the extreme edge and feathered at the inside edge. At the limits of the work and at all cross streets, driveways, and any other locations where the PPEST will adjoin an existing pavement, the milling shall facilitate a smooth transition of the profile between the PPEST and the existing pavement. The transition shall be prior to the termini of any traffic detector loops. The surface shall be swept and thoroughly cleaned of vegetation, debris, loose aggregate, soil and dust, particularly soil that is bound to the surface. All matter shall be legally disposed off site. Prior to application of the surface treatment, the Contractor shall obtain from the Engineer approval and acceptance of the surface preparation.

411.03.2 Production Tolerances. The aggregate gradation and asphalt binder content of the

production mix shall comply with the job-mix form ula and optimum asphalt binder content, within the following tolerances: Sieve Size Tolerance 1/2" - 3/8" ±5% #4 ±7% #8 ±4% #30 ±4% #50 ±3% #200 ±1.5% Asphalt Binder ±0.3%

411.03.3 Mixing and Compaction Temperatures. The mixing and compaction temperatures

shall be as recommended by the supplier of the modified asphalt binder. 4−48

411.03.4 Weather Limitations. The PPEST shall be placed only when the surface is dry and the

surface temperature is at least 50oF and rising.

411.03.5 Time Limitation. The PPEST shall not be placed before June 1 or after September 30.

411.03.6 Tack Coat. An SS-1 or RS-1 asphalt emulsion tack coat shall be applied uniformly over

the surface on which the PPEST is to be placed. The application rate shall be 0.10 ± 0.01 gallons per square yard. The tack coat shall be applied using the proper nozzle settings and the “double coverage” or “triple coverage” techniques outlined in Chapter 5 of the Asphalt Institute publication MS-22 “Construction of Hot Mix Asphalt Pavements.”

411.03.7 Placement. The mix placement temperature shall be as recommended by the supplier

of the modified asphalt binder. Special attention shall be paid to the formation of longitudinal joints. The cold edge shall be as vertical and square as possible. Sloughed or disturbed material at the edge shall be luted back to form a vertical face in alignment with the joint.

411.03.8 Compaction. The compacted thickness of the PPEST shall be 1±1/4 inch. Under no

circumstances shall the minimum thickness be less than ¾ inch. Compaction shall commence immediately after plac ement. All rollers shall weigh at least 10 tons and shall operate in the static mode. Compaction to the specified density shall be attained before the PPEST cools to a temperature 20 oF less than the specified compaction temperature.

411.04 METHOD OF MEASUREMENT. “Paver Placed Elastomeric Surface Treatment” will be

measured by the number of square yards of paver-p laced surface treatment completed in place in accordance with the contract or as directed by the Engineer.

411.05 BASIS OF PAYMENT. The accepted quantities of “Paver Placed Elastomeric Surface

Treatment” will be paid for at the contract unit price per square yard as listed in the Proposal. The price so-stated shall constitute full and complete compensation for all traffic control, including traffic control for adjustment of manholes, gates, catch basins and other such structures; mobile phones; surface preparation; furnishing, transporting, handling, placing and rolling the PPEST material as specified; site clean up; furnishing of all labor, tools, equipment and all incidentals for the satisfactory completion of the work; and all work not specifically identified as separate pay items in the contract provisions. The shim course, including the tack coat applied under the shim course, will be paid for under separate items in the Proposal. Ten percent of the total amount due the contractor will be withheld until at least 60 days after all the contract work specified is completed, the surfaced highways have been opened to traffic and the surface treatment is determined to be performing satisfactorily.