636ASPHALT CONCRETE CURB

636.1DESCRIPTION —This work is construction of a hot -mixed, hot -laid, asphalt concrete curb on a

completed asphalt surface.

636.2MATERIAL—Section 413.2, except that the mixture design controls do not apply.

Section 106.03(b)3. The supplier shall certify that the filler conforms to the following requirements:

Average Length 0.25 inch ± 0.06 inch Average Diameter 0.0004 inch minimum Specific Gravity 1.34 to 1.40 Melting Temperature 480F minimum Tensile Strength 70,000 pounds per square inch minimum

mixture conforming to composition by weight percentages within the limits of Table A and as directed. Add approximately 0.3% asphalt cement per 0.12% by weight of polyester fibers.

TABLE A Asphalt Concrete Curb (Percentages by Weight Passing Square Opening Sieves)

Passing Sieve Required Composition of Mixture

3/8-inch 100 No. 4 90 - 100 No. 8 70 - 100 No. 16 50 - 80 No. 30 35 - 60 No. 50 20 - 45 No. 100 10 - 30 No. 200 5 - 20

Asphalt Cement, % by Weight 6 - 13 Drawn Polyester Fiber, % by Weight of Total Mix 0.12 - 0.38

636.3CONSTRUCTION—

except that three bins are not required.

specified in Section 460.3.

determine the mixture temperature from within the range of 290F to 315F based on weather conditions and workability requirements at the time of placement. Maintain the mixture temperature wi thin a tolerance of 15F of the mixture temperature. Place the hot asphalt mixture in the hopper of the curb -paver without segregation and then extrude the mixture through the mold to provide the proper compaction and surface texture. Properly support and mass-load the curb-paver during operation along the edge of pavement. Guide the paver along string or chalk lines to maintain proper alignment and grade of the completed curb. Where indicated or directed, make drainage openings through the curb. Remove and replace completed curbs that show signs of sagging, cracking, or distortion; do not conform to lines, grades, or cross sections; and that cannot be satisfactorily repaired.

curb. Just before placing the curb resumes, paint the joint with a thin, uniform coat of hot Asphalt Cement, Class PG 64S-22 or PG 58S-28.

material behind the curb up to the required elevation and cross section.

636.4MEASUREMENT AND PAYMENT—Linear Foot