2. When the construction temperature of the secondary trunk road and its following roads is lower than 5℃, the construction shall be stopped.
3. Bonding layer, prime coat and seal coat are prohibited from construction.
4. When construction is needed, the temperature of mixing, transportation and construction should be appropriately increased.
Extended data:
Preventive and control measures
(1) in terms of materials
Reasonable determination of asphalt pavement structure, asphalt pavement cracks are mainly caused by low temperature shrinkage of asphalt pavement itself. Select high-quality asphalt with low stiffness, large ductility, poor temperature sensitivity and low wax content at low temperature, carefully select mineral aggregate, accurately grade mineral aggregate of asphalt surface, and rationally allocate asphalt mixture ratio. Preparing asphalt mixture with excellent performance, controlling asphalt content and ensuring excellent performance of asphalt mixture can effectively reduce cracks.
(2) design.
When designing semi-rigid pavement, high penetration asphalt is preferred as asphalt surface layer on the premise that the stability meets the requirements. Dense asphalt concrete is used as the asphalt surface layer. Appropriate asphalt pavement thickness is adopted to ensure that semi-rigid base will not produce dry shrinkage cracks and temperature shrinkage cracks during use. Carefully design and do a good job in geological survey of complex terrain.
Special attention should be paid to strengthening the foundation to prevent uneven settlement caused by weak foundation. Qualified fillers should be used to fill the subgrade, or after the fillers are treated, the subgrade should be filled to ensure sufficient strength and stability, so as to ensure a stable foundation for the pavement. Semi-rigid materials with good scour resistance, small dry shrinkage coefficient and temperature shrinkage coefficient and high tensile strength should be selected as the base. High-quality asphalt is selected as the asphalt surface layer; On the premise that the stability meets the requirements, the asphalt surface layer should be made of asphalt with high penetration.
(3) architecture.
Carefully construct, select advanced construction technology and mechanical equipment, formulate a perfect construction scheme, ensure the compactness meets the specification requirements, carry out soft foundation treatment in strict accordance with the design requirements, improve the construction quality of soft foundation treatment, and strictly control the water content of semi-rigid base construction during rolling. The water content of the mixture should not exceed the optimum water content required for compaction, or be controlled within the scope allowed by the construction specification; After semi-rigid base is rolled. Keep in good health in time, prevent cracks from reflecting to the surface, and protect the water content of the mixture from losing; Priming oil shall be sprayed immediately after curing, and asphalt surface layer shall be paved as soon as possible.
(4) Maintenance
Strict maintenance management, strengthen road cleaning, and ensure good drainage performance. Scientific treatment of cracks in time to avoid further expansion of the disease.
(5) Strengthen traffic management.
Strengthen traffic management and restrict the passage of large overloaded vehicles; During the continuous high temperature in summer, the operation management unit can arrange heavy vehicles to pass at night and early morning when the road temperature is low: excessive wear of nail tires on the road surface is prohibited or the use is strictly restricted.