Precautions for Asphalt Pavement Construction in Winter

For asphalt pavement construction in winter, we need to follow a series of precautions. These suggestions not only meet market requirements, but also help ensure construction quality and extend the service life of roads.

1. Temperature monitoring and management

1) Ensure that the temperature of the air and bitumen is within the allowable range of the engineering specifications. Usually, the air temperature should be higher than 5℃, and the factory temperature of the asphalt mixture should not be lower than 150℃.

2) Use insulation facilities such as heaters or insulation materials to maintain the temperature of the mixing equipment.

2. Material selection and storage

1) Use asphalt mixture that has been specially treated or modified with additives to enhance its performance under low temperature conditions.

2) Ensure that all construction materials such as bitumen and aggregate are properly insulated and stored in a dry, well-ventilated area.

3. Construction time planning

1) Choose a time of day with higher temperatures for construction, avoiding the cold period after sunset.

2) Shorten the construction period and reduce the exposure time of materials at low temperatures.

4. Mixing and transportation

1) During the mixing process, make sure to mix evenly at a proper temperature.

2) Tidy up the carriage before loading. During transportation, prevent the mixture from sticking to the bottom of the carriage, which should be coated with anti-adhesive or release agent.

3) Ensure that the mixture is not affected by sudden braking, sharp turns, or bumps during transportation.

5. Paving and rolling

1) Use a vibratory tamper with a high frequency to ensure that the density meets the requirements.

2) Use a small-tonnage roller for initial rolling, avoiding the use of rubber-tired rollers.

3) Avoid opening the traffic before the road temperature drops to 50℃.

6. Quality inspection and control

1) Conduct more Marshall tests for molding and ensure their authenticity and reliability.

2) Carry out more on-site drill core samplings and ensure their quality, focusing on inspecting indicators such as the density and porosity of the asphalt mixture.

7. Safety and environmental protection

1) Check mechanical equipment regularly to ensure its normal operation, and strengthen safety management on the construction site.

2) Set up obvious safety warning signs and safety protection facilities.

3) Control the emission of construction noise, wastewater and exhaust gas, so as to minimize the impact on the surrounding environment.

8. Other precautions:

1) Strengthen the connection with local meteorological department, in order to understand the weather changes and take measures in a timely manner.

2) Pay attention to the temperature change of the mixture to prevent abnormalities.

3) Enhance the management and supervision of the construction site to ensure the effective implementation of various measures.

4) Strengthen communication and coordination with relevant government agencies to ensure smooth construction.

In conclusion, the construction of asphalt pavement in winter calls for special attention to issues such as quality, safety, and environmental protection. Bearing the suggestions in mind, it is possible to effectively complete the task of asphalt pavement construction under severe winter conditions.