1. It has sufficient strength and appropriate rigidity.

2. It has good stability.

3. The drying shrinkage and temperature shrinkage deformation are small.

4. The surface should be smooth and dense; The camber should be consistent with the camber of the surface layer; Elevation meets the requirements. Technical requirements for construction

I. General requirements

1. Hot mix asphalt concrete mixture can be divided into five types according to the maximum particle size of aggregate: extra-coarse, coarse, medium, fine and sand.

2. The maximum particle size of aggregate on the surface of asphalt concrete should match the thickness of layered compacted layer.

Two. preparatory work/be about to work

1. The quality of the base and subsidiary structures should be re-checked to confirm that they meet the requirements of the specification. Building materials should be used after passing the test. Machinery should be set aside and kept in good condition.

2. Asphalt heating temperature and asphalt mixture mixing and construction temperature should be selected according to asphalt grade, viscosity, climatic conditions, paving layer thickness and underlay thickness, and meet the requirements of Code for Construction and Quality Acceptance of Urban Road Engineering (CJJ 1-2008). When the asphalt has high viscosity, low temperature and small paving layer thickness, the upper limit of construction temperature should be adopted.

3. The important asphalt concrete pavement should be repaired in the test section of100-200m, which is mainly divided into two stages: trial mixing and trial paving, so as to obtain the corresponding parameters. 3. Mixing and transporting asphalt mixture must be carried out in asphalt mixing station (field, station). There should be good rain-proof and drainage facilities, and a laboratory should be equipped to ensure qualified quality. The asphalt concrete of urban main roads and expressway should be mixed by intermittent mixer. It has an automatic batching system, which can automatically print the parameters such as stirring temperature, stirring time and stirring amount of each mixture. In order to cooperate with the mass production of mixture, large-tonnage dump trucks should be used for transportation. The asphalt mixture leaving the factory shall be weighed one by one, the temperature of the asphalt mixture in the car shall be measured, and a delivery note shall be issued in triplicate. One is stored in the mixing plant, one is sent to the paving site, and the other is given to the driver. When discharging, discharge evenly to prevent thickness separation. Do a good job in heat preservation, rain protection and environmental protection.