I. Basic Principles
During asphalt pavement construction, we must clearly define basic principles to ensure that each step complies with specifications. These principles include: the semi-rigid base should first be sprayed with a penetration coat to ensure full penetration; a sub-seal coat must be used on bases paved with inorganic binders; and the penetration coat, sub-seal coat, and tack coat should be applied using intelligent asphalt spreaders. Before officially commencing the sub-seal coat, a trial section should be inspected and reviewed to confirm satisfactory quality before large-scale construction can commence.
II. Penetration Coating Construction
1.1 Construction Preparation
Before beginning penetration coat construction, all preparatory work must be complete, including technical preparation, mechanical equipment commissioning, and calibration of testing and inspection instruments. Furthermore, all materials must be adequately supplied, and the work surface must be cleaned and tidied. Before spraying penetration coat, use a high-powered sweeper to remove any loose dust, supplemented by a forest fire extinguisher for further cleaning, to ensure a dust-free environment in the construction area. 1.2 Material Requirements
Penetrating oil requires emulsified asphalt with good permeability. Based on construction requirements, it is recommended to use emulsified asphalt with excellent permeability. The viscosity of the penetration oil can be flexibly controlled by adjusting the concentration of the emulsified asphalt.
1.3 Construction Key Points and Schematic Diagram
Penetrating oil should be sprayed when the base layer is compacted and slightly dry, but not yet completely hardened. Intelligent asphalt spreaders should be used during construction. The spraying rate should be determined through testing to ensure uniform distribution of the penetration oil. During spraying, the nozzle axis of the asphalt spreader must be perpendicular to the road surface, and all angles must be consistent to effectively improve construction quality.
1.4 Quality Control
During construction, the quality of the penetration oil must strictly comply with regulatory requirements. Visual inspection and testing should be conducted to ensure that the penetration oil is evenly distributed and that the penetration depth meets the standard. All testing items, frequency, technical standards, and test methods must comply with relevant regulations.

III. Lower Seal Coat Construction
Preliminary Preparation and Materials
Before applying the lower seal coat, ensure that materials are fully prepared. Commonly used materials include emulsified asphalt, modified emulsified asphalt, road petroleum asphalt, modified asphalt, and rubberized asphalt. All materials must comply with the requirements of the "Technical Specifications for Highway Asphalt Pavement Construction."
Test Sections and Construction Key Points
Before formal construction begins, a test section should be constructed. This trial paving process will clarify the asphalt and aggregate application method and quantity, as well as the compaction process, to ensure that the construction methods and materials meet the requirements.
Asphalt and Aggregate Treatment
Before applying the subseal, contaminants on the subsoil surface must be thoroughly removed. Subsequently, a forest fire blower should be used to remove loose dust and ensure that the surface aggregate particles are fully exposed. Asphalt spraying and aggregate spreading should be uniform.
Simultaneous Construction and Compaction
During the simultaneous chip seal application, a simultaneous chip seal vehicle is used to ensure uniform application and material density. This specialized vehicle ensures the quality and uniformity of the seal. During the compaction process, a light tire roller is used to ensure uniform compaction and the required width of the seal. IV. Tack Coat Application
Construction Preparation and Materials
Before tack coat application, technical, mechanical, and testing preparations are required. The tack coat asphalt material should be fast-crack or medium-crack emulsified asphalt, or modified emulsified asphalt, to ensure consistency with the surface road petroleum asphalt.
Construction Key Points and Quality Control
The tack coat spray quantity is determined through testing to ensure uniform application. During spraying, the tack coat should form a uniform mist, forming a thin layer across the entire width of the road surface. After spraying, traffic should be closed and maintenance should be carried out immediately to ensure the spray effect has set.