9.C.1. PRSR 01-10-2001 - Laserfiche WebLink

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Trench rollers shall be self propelled and have a mass of not less than 4400 kg per meter (2960 III lb per ft) of width. C5 Mixture Temperature Controls If compaction is obtained by the ordinary compaction method, the minimum laydown temperature in all courses (as measured behind the paver or spreading machine) of the asphalt mixture shall be in accordance with the temperature requirements of Table 2350 - 11. Table 2350 -11 Mixture Temperature Control Air Temperature Compacted Mat Thickness, mm(A) °C (°F) 25 mm (1 in) 40 mm (1-1/2 in) 50 mm (2 in) 75 mm (3 in) or greater +0-5 (32-40) -- 129 (B) (265) 124 (255) 121 (250) + 6-10 (41-50) 130 (B) (270) 127 (260) 121 (250) 118 (245) + 11-15 (51-60) 127 (B) (260) 124 (255) 118 (245) 115 (240) + 16-21 (61-70) 121(B)(250) 118 (245) 115 (240) 113 (235) + 22-27 (71-80) 118 (245) 115 (240) 113 (235) 113 (235) + 28-32 (81-90) 113 (235) 110 (230) 110 (230) 110 (230) + 33 (91+) 110 (230) 110 (230) 110 (230) 107 (225) - (A) Based on approved or specified compacted lift thickness. (B) A minimum of one pneumatic-tire roller shall be used for intermediate rolling unless otherwise directed by the Engineer. The Engineer may specify or modify in writing (with concurrence from the Bituminous Engineer) • a minimum laydown temperature. 2350.7 Thickness and Surface Smoothness Requirements A Thickness After compaction the thickness of each course shall be within a tolerance of 6 mm (1/4 in) of the thickness shown in the Plans, except that, if automatic grade controls are used, this thickness requirement will not apply to the first course placed. This thickness requirement will not apply to a leveling course whether or not automatic grade controls are required. Any part of any course that is constructed to less than the minimum required thickness may be removed and replaced at the discretion of the Engineer. On that portion of any course constructed to more than the maximum permissible thickness, the materials used in the excess mixture above that required to construct that portion of the course to the Plan thickness plus 6 mm (1/4 in) will be excluded from the pay quantities and may require removal and replacement at the discretion of the Engineer. Cores taken for density determination shall be measured for thickness also. Each core shall be measured 3 times for thickness prior to sawing. Report the average of these three measurements. Each lot's average core thickness shall be documented and submitted to the Engineer. If the average of the two Contractor cores exceed the specified tolerance, an additional two cores may be taken in the lot in question. The average of all core thickness • measurements per course will be used to determine compliance with thickness specifications.