The Paving Temperature of Asphalt Mixture
Feb 29, 2024
The paving temperature of asphalt concrete should be adjusted according to the ambient temperature changes. Generally, the normal construction temperature should be controlled at no lower than 110-130℃, while not exceeding 165℃.
Below precautions for asphalt concrete paving:
1. Inspect the lower supporting layer.
2. Confirm the mix ratio of asphalt mixture, including determining the mix proportion of aggregate and the amount of asphalt.
3. Use intermittent mixer for asphalt mixing.
4. Transport asphalt with waterproof, heat preservation, and anti-adhesion measures.
5. Pave at a temperature of no lower than 110 -130℃. Work with two to three pavers for continuously and evenly paving.
6. Roll with 2-3 rollers. The temperature after rolling should be no lower than 65℃. The rolling process consist of initial rolling, secondary rolling, and final rolling. Use mist spraying to prevent sticking.
7. When spraying water on the roller during construction, pay attention to controlling the amount of spraying to prevent the dropping of mixture temperature. Use a mist sprayer. At the joint of the mixture or where hot and cold materials overlap, adopt cross-joint rolling.
8. Conduct inspections all the time during construction.
9. Open traffic when the temperature drops to 65℃ after rolling.
10. Do not use unqualified raw materials for road construction. Enhance the testing of mixture ratios with strict on-site inspection and indoor testing. This includes temperature testing and recording at the mixing plant and construction site, which contains but not limited to Marshall tests, extraction tests at specified frequencies, pavement dimension records, as well as the testing of pavement thickness, compaction, and flatness.
11. Strengthen the management and analysis of inspection data to ensure engineering quality. This includes the condition of the stockyard, daily mixing records, daily construction site records, determination and feedback of inspection data, daily engineering quality indicator charts, dynamic analysis of engineering quality and more.
12. Set up clear signages for the initial rolling, secondary rolling, and final rolling sections so that it would be easier for drivers to recognize. Dedicated positions should be set up to inspect the loose paving thickness, rolling order, rolling times, rolling speed, and rolling temperature.
13. Strictly control the rolling temperature and times to prevent over-rolling, or it may result in too high density or too low void content.
Apart from above, a reliable asphalt mixing plant and crushing equipment are also of great importance to the good paving. With rich experience and leading technology in the road construction industry, contact us.