Multi - gravel asphalt concrete surface layer from quangongzi's blog

Generate the background

Large flow of vehicles on the highway safe, comfortable high-speed traffic, asphalt surface layer must have good anti-skid properties. This requires that the asphalt surface not only have a large coefficient of friction, but also have a deeper surface structure depth (structure depth is the high-speed traffic to reduce noise and reduce water〗 〖LM drift, splashing the main factors affecting the driver's line of sight). The results show that: "The anti-sliding performance of asphalt surface layer is formed by the microstructure and macroscopic structure of the surface layer structure, in which the macroscopic structure is derived from the asphalt mixture proportion, which is mainly determined by the thickness and gradation form of the aggregate ".Double Steel Roller - Road Machinery Equipment Manufacturers - Doan Machinery

In the mid-1980s, China began to build high-grade highway. Asphalt concrete surface structure: Ⅰ type asphalt concrete, porosity 3% ~ 6%, small water permeability, durability, surface layer of friction coefficient can meet the requirements, But the depth of the surface structure is small, far can not meet the requirements. Ⅱ type asphalt concrete porosity of 6% to 10%, surface structure deep, strong resistance to deformation, but its water permeability, durability is poor. In order to solve the asphalt surface skid resistance performance (especially the surface layer in the case of structural depth is large, but also has good waterproof structure), multi-gravel asphalt concrete surface layer to be studied and used.

Characteristics of Asphalt Concrete Pavement with Multiple

Multi-crushed asphalt mixture is the use of more coarse gravel to form the skeleton, asphalt sands fill the pores in the skeleton and the framework of the glue together to form the form of asphalt mixture. Concrete composition: coarse aggregate content of 69% to 78%, 6% to 10% of slag, Whetstone ratio of about 5%. The practice of several highways proved that the multi-crushed asphalt concrete surface layer can not only provide the deep surface structure, but also has the traditional Ⅰ type asphalt concrete as a small gap and less water permeability, but also has good resistance Deformation ability (high dynamic stability). In other words, "multi - crushed asphalt concrete has both the advantages of the traditional type of asphalt concrete, but also has the advantages of type Ⅱ asphalt concrete, while avoiding the two traditional asphalt concrete structure of the shortcomings.