408PRIME COAT

408.01 Description

408.02 Asphalt Material

408.03 Cover Aggregate

408.04 Weather Limitations

408.05 Equipment

408.06 Preparation of Surface

408.07 Application of Asphalt Material

408.08 Application of Cover Aggregate

408.09 Method of Measurement

408.10 Basis of Payment

408.01 Description. This work consists of preparing and treating an existing

surface with asphalt material, and cover aggregate if required.

408.02 Asphalt Material. Conform to the applicable requirements of 702 for

asphalt material and use one of the following types: 702.02 MC-30, MC -70, or MC - 250; or 702.03 Primer 20.

408.03 Cover Aggregate. Use cover aggregate conforming to No. 9 size or

gradation requirements of 703.05 or 703.06.

408.04 Weather Limitations. Do not apply asphalt material on a wet surface.

Do not apply prim e coats for asphalt concrete or surface treatment work when the atmospheric temperature is below 50 F (10 C) or when the air temperature within the preceding 24 hours has been 40 F (5 C) or lower. Do not apply prime coats on stabilized or granular base courses when the atmospheric temperature is below 40 F (5 C).

408.05 Equipment. Use equipment conforming to 407.03.

408.06 Preparation of Surface. Shape the surface to be primed to the required

grade and section. Ensure the surface is free from all ruts , corrugations, segregated material or other irregularities and is smooth and uniformly compacted at the time of application of the asphalt material. Clean the surface in a manner that will thoroughly remove all mud, earth, and other foreign material. Take care to clean the edges of road to be primed to ensure uniform application of the asphalt material directly onto the existing base or pavement surface. Remove material cleaned from the surface and dispose of it as the Engineer directs. 408.07 205 408.07 Application of Asphalt Material. Apply asphalt material in a uniform manner spread to the width of the section to be primed by means of a distributor conforming to 407.03. Take care that the application of asphalt material at the junction of spreads is not in excess o f the specified amount. Squeegee excess asphalt material from the surface. Correct skipped areas or deficiencies. Do not allow traffic on the prime coat until the asphalt material has been absorbed by the surface and will not be picked up. Obtain the Engin eer's approval for the quantity, rate of application, temperatures and areas to be treated before application of the prime coat.

408.08 Application of Cover Aggregate. If, after applying the prime coat, the

asphalt material fails to penetrate and traffic m ust use the roadway, spread cover aggregate in the amount required to absorb any excess asphalt material.

408.09 Method of Measurement. The Department will measure Prime Coat by

the number of gallons (liters) according to 109.

408.10 Basis of Payment. The cost of cover aggregate is incidental to Prime

Coat. The Department will pay for accepted quantities, complete in place, at the contract price as follows: Item Unit Description 408 Gallon (Liter) Prime Coat ITEM 409 SAWING AND SEALING ASPHALT CONC RETE PAVEMENT JOINTS

409.01 Description

409.02 Materials

409.03 Construction Details

409.04 Method of Measurement

409.05 Basis of Payment

409.01 Description. This work consists of saw cutting and sealing the finished

surface of the asphalt concrete pavement an d shoulders directly over and in line with transverse joints in the underlying Portland cement concrete pavement.

409.02 Materials. Use joint sealant conforming to 705.04 and approved by

OMM before shipment to the project. Use a 1/2 inch (13 mm) diameter c losed cell foam backer rod that will form and maintain a reservoir of sealant as specified in 409.03.

409.03 Construction Details. Saw cut, clean, and seal transverse joints as a

continuous operation. If the surface course is not placed within 5 days after the intermediate course is placed, make a 1/8 -inch (3 mm) wide saw cut that is one - fourth the depth of the intermediate course over contraction joints and a 1/2 -inch (13 mm) wide cut that is one -fourth the depth of the intermediate course over expansion joints. 409.03 206 Saw joints in the surface course as soon as the saw can be operated without damaging the asphalt concrete, but no later than 48 hours after the asphalt concrete is placed. Locate the sawed joints directly over each transverse pavement joint in the concrete pavement, including joints at full -depth pavement repairs. Accurately locate joints with pins or stakes before paving. Pre-mark the saw cut on the new asphalt with a chalk line or other acceptable method. Obtain the Engineer's approval of the metho d for locating and accurately marking the proposed saw cuts before starting any resurfacing operations. Saw all transverse joints and create a joint sealant reservoir according to Table

409.03 1. Use either dry or wet cutting. Make one or two passes to cre ate the saw

cut and joint sealant reservoir. TABLE 409.03 -1 Measurement Inch (mm) Saw cut depth 2 (50) Backer rod diameter 1/2 (13) Joint sealant reservoir Width 3/8 (10) Depth 3/4 (19) Recess below surface course 1/8 (3) Clean dry sawed joints with compressed air to remove dirt, dust, or deleterious matter. Use an air compressor with a minimum rated capacity of 100 pounds per square inch (689 kPa) and sufficient hose for continuous cleaning operations. Clean wet sawed joints with a water blast to remove sawing slurry, dirt, or deleterious matter. Dry wet sawed joints with a propane torch or lance unit capable of producing a blast of hot air at 2000 F (1093 C) and with a gas velocity of 2000 feet per second (610 m/s). Extend the transvers e saw cut joints the full width of the asphalt over the concrete pavement and paved shoulders. Do not allow traffic to knead together or damage the sawed joints before sealing. Heat joint sealant material in a kettle or melter constructed as a double boile r, with the space between the inner and outer shells filled with oil or other heat transfer medium. Provide positive temperature control and mechanical agitation. Heat the material according to the manufacturer’s recommendation. Consider the first gallon (4 L) of material that flows out of the applicator wand at the start of the day spoil, and discard it into a container so designated. After cleaning, place the backer rod in the sawed joints, then immediately seal the joints with sealant applied through a nozzle projected into the sawed joint, filling from the bottom up. Ensure that the sealant completely fills the joint such that after cooling, the level of the sealant is below the surface by less than 1/8 inch (3 mm). Fill any depression in the seal great er than 3/16 inch (5 mm) to the specified limit by adding additional sealant. Do not overfill the joints. Take care in the sealing of the joints so that the final appearance will present a neat line. 409.04 207 409.04 Method of Measurement. The Department will measur e Sawing and Sealing Asphalt Concrete Pavement Joints by the number of feet (meters) of joints sawed and sealed.

409.05 Basis of Payment. The Department will not pay for saw cuts in the

intermediate course. The Department will pay for accepted quantities a t the contract price as follows: Item Unit Description 409 Foot (Meter) Sawing and Sealing Asphalt Concrete Pavement Joints ITEM 410 TRAFFIC COMPACTED SU RFACE

410.01 Description

410.02 Materials

410.03 Conditioning of the Subgrade

410.04 Spreading and Shaping

410.05 Maintaining

410.06 Method of Measurement

410.07 Basis of Payment

410.01 Description. This work consists of furnishing and placing an aggregate

wearing course on the completed and accepted subgrade or temporary road.

410.02 Materials. Furni sh materials conforming to 703.18 for the type of

material specified (Type A, Type B, or Type C).

410.03 Conditioning of the Subgrade. Eliminate wavy and irregular surfaces

and maintain the subgrade in this condition until the application of material unde r this item. If the subgrade is soft due to rain, frost, or snow, place material only as permitted.

410.04 Spreading and Shaping. Uniformly spread the material using an

approved spreader box or by other methods. Spread the amount of material shown on the p lans or as directed by the Engineer. After spreading, blade and shape the materials to the specified cross -sections. Haul the material to its place on the road over the previously spread material. Conduct the hauling to obtain uniform compaction over the e ntire width of the surface material without rolling.

410.05 Maintaining. After shaping the material, blade it as directed by the

Engineer. Open the road to traffic immediately after all the material has been spread and shaped. Correct all holes, ruts, defe cts, or soft places that occur in the subgrade or surface by adding material and dragging. Maintain the surface, slopes, shoulders, ditches, and drainage structures until the work on this item has been completed and accepted.

410.06 Method of Measurement. The Department will measure Traffic

Compacted Surface, Type ___ by the number of cubic yards (cubic meters) or tons (metric tons) of accepted material placed, shaped, and maintained as specified.