1999-338A - Laserfiche WebLink

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I-] a not be permitted. =Asphaltic concrete whose temperature is less than 210 F when delivered to the job site may result in immediate rejection from application by the Engineer. All material rejected by the Engineer shall be replaced with specified material by the Contractor at no additional cost to the Owner. B. The asphaltic concrete shall be applied by an approved type of self propelled paver, such as a Barber Green, capable of making a continuous 10 ft. wide pull. The paver shall have a disbursing hopper, a compacting devise, and a screed capable of adjustment to produce the required paving cross section. The screed shall be equipped with heaters. C. Immediately after the asphaltic concrete is spread, any deviations from the typical section shall be remedied by placing - additional material or by removing surplus material while the mixture is still hot. D. Rolling should begin as soon as possible after the asphaltic concrete has been spread as specified. Rolling of the longitudinal joint should be immediately behind the paving operation. The initial pass with the roller should be made as soon as it is possible to roll the bituminous mixture without cracking the mat or having the mix adhere to the roller wheels. E. The rolling shall be done by a "Rolling Train", consisting of a steel wheel sea] roller, and a pneumatic tired traffic roller and a steel wheel finish roller. All of which shall be on the job when the asphalt laying commences and remain on the project until the paving work has been completed. F. Rolling of the longitudinal joint should be immediately behind the paving operation. The initial pass with the roller should be made as soon as it is possible to roll the bituminous mixture without cracking the mat or having the mix adhere to the roller wheels. To prevent adhesion of the mix to the roller, the wheels should be kept moist with only enough t water to avoid picking up the material. G. Steel wheeled rollers shall be of the tandem type. For seal rolling, these rollers shall weigh between 5 and t2 tons and for final rolling, they shall weigh between 8 and 12 tons. H. Traffic rollers shall be of the self propelled pneumatic tired type, equipped with at least seven (7) smooth tread, low pressure tires. with the tire pressure maintained between 50 to 55 pounds. Traffic rollers shall weigh between G and LO tons. Wobble wheeled rollers are prohibited r from rolling on this project. I. The speed should not exceed 3 mph for steel wheeled rollers or 5 mph t for pneumatic tired rollers. Finish rolling should be done while the material is still workable enough for removal of roller marks, before the pavement temperature L. has dropped below 1400 F. Abrupt turning of rollers on the paving mix which causes undue displacement shall not be permitted. L W