Modified asphalt takes you to understand the structural layer of asphalt pavement

Upload time :2022/7/19 8:46:47

Asphalt pavement includes multi-layer structures modified asphalt such as surface slope, soil slope, bottom surface and pad surface, as shown in the figure. This is a good analogy.


1. The surface layer is the structural layer, which is directly affected by the repeated action of the wheel load and various natural elements, and transfers the load to the bottom layer. Therefore, it is necessary to meet the requirements of using the appearance function and structure. The exterior gradient can be single, double or triple. The two-layer structure is called the outer layer and the bottom layer; if a three-layer structure is selected, it is called the outer layer, the middle layer and the bottom layer. This is a good analogy.


The surface layer should have the functions of leveling, sealing, non-slip, wear-resistant, stable and durable, and resistant to high temperature seams, low temperature cracks, and aging. D. They must be fine, basically impermeable, and have mechanical properties resistant to high temperature cracking, shearing and fatigue. This is a good analogy.


2. The main gear is the main bearing layer, which must have stability, durability and high bearing capacity. Foundation courses can consist of one or two classes and are called foundation courses. Whether resin compound or granular chassis, modified asphalt semi-rigid chassis or rigid chassis, high physical and mechanical performance is required. This is a good analogy.


3. The bottom layer is the second load-bearing layer in the lower part of the bottom layer, which receives the multiple impacts of the wheel load from the outer surface and the bottom layer. Therefore, the technical index requirements of underground materials may be slightly lower than those of matrix materials, and the underground can be divided into upper and lower subsurfaces. This is a good analogy.


4. The cushion layer is placed in the structural layer between the bottom and the foundation, which plays the role of hydrophobicity, water resistance, frost resistance and antifouling, which reduces the modularity ratio between layers and reduces the tensile stress of the semi-rigid bottom. This is a good analogy.


Higher rock asphalt layer composition. It is necessary to recognize the structural layers required at all levels of the expressway on a case-by-case basis. For Class III and Class IV highways, at least two layers need to be recognized, namely surface and base. In the table you can find application areas with different surface gradients.

If you have any other questions, please contact us modified asphalt for details or contact us directly.


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