Asphalt Concrete Pavement Placement Requirements | Asphalt Aggregates | Asphalt Surface Course | Asphalt Base Course | Prime Coat | Tack Coat |
In this Article today we will talk about the Asphalt Concrete Pavement Placement Requirements | Asphalt Surface Course | Asphalt Base Course | Prime Coat | Tack Coat | Asphalt Aggregates.
Prime Coat:
Prime coat shall be applied when the air temperature is above 10 °C (50 °F) and rising, the air temperature being taken in the shade and away from artificial heat. Primer shall not be placed when general weather conditions are not suitable.
Asphalt Base Course:
Prime coat shall be applied to subbase before placing asphalt concrete base course. The prime coat application temperature should be maintained as close to 70 °C as practical. The base course shall be laid as detailed in Asphalt Surface Course.
Tack Coat:
Temperature of application of RC-70 tack coat shall be 49 to 88 °C (120 to 190 °F). A temperature-volume correction shall be applied.
OTHER POSTS:
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Asphalt Concrete Receiving, Placement and Testing Inspection | Wearing and Binder Course
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Method Statement for Asphalt Paving Works | Asphalt Concrete
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Asphalt Concrete Pavement Placement Requirements
Asphalt Surface Course:
Asphalt surface course mixture shall be placed only when the specified density can be obtained. Precautions shall be taken to compact the mixture before it cools too much, to obtain the required density. The mixture shall not be placed on wet surfaces or when weather conditions will otherwise prevent its proper handling or finishing. Asphalt surface course mixture shall be placed when the base course surface is dry and its surface temperature is at least 10 °C. The temperature of asphalt mixture at the time of placing shall be between 110 °C and 150 °C.
Weather and Temperature Precaution:
The minimum air temperature, in the shade, at which asphaltic concrete may be laid shall be 5 °C if rising or 10 °C, if falling. At the time of laying the asphalt concrete, the air temperature shall not be greater than 40 °C. No construction shall be permitted during sand storms. When the weather condition may prevent proper leveling and thorough consolidation, the contractor shall stop the laying of the asphalt concrete. The restart of work shall be after Client approval.
Equipment:
The mixing plant shall have a capacity sufficient to produce the asphalt mixture at the rate required for the satisfactory execution of the job and within the specified time. Equipment shall be approved by Client.
Prime Coat | Equipment used shall include a power broom, a power blower, or both; mechanical or self-propelled aggregate spreading equipment that can be adjusted to uniformly spread the sand cover; a pressure distributor; and equipment for heating the asphaltic material. The distributor shall be equipped with devices and charts to provide for accurate and rapid determination and control of the amount of bituminous materials being applied per square meter of surface under the operation conditions, and shall have a tachometer, reading speeds in meters per minute.
Asphalt Base Course | Equipment for construction of the asphalt base course shall include: asphalt mixing plant; self-powered pavers; smooth metal-bedded haul trucks with covers when required; asphalt pressure distributor; steel-wheeled, pneumatic-tired, or vibrating rollers capable of attaining the required density and smoothness; power broom or power blower.
Tack Coat | Equipment used shall include a power broom, a power blower, or both; mechanical or self-propelled aggregate spreading equipment that can be adjusted to uniformly spread the sand cover; a pressure distributor; and equipment for heating the asphaltic material. The distributor shall be equipped with devices and charts to provide for accurate and rapid determination and control of the amount of bituminous materials being applied per square meter of surface under the operation conditions, and shall have a tachometer, reading speeds in meters per minute.
Asphalt Surface Course | Equipment for construction of the asphalt surface course shall include: asphalt mixing plant; self-powered pavers; smooth metal-bedded haul trucks with covers when required; pressure distributor; flat rollers capable of attaining the required density and smoothness; power broom or power blower.
Conclusion:
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