What are the characteristics of permeable asphalt pavement?

Advantages: Compared with gravel pavement, this kind of pavement has greatly improved its strength and stability. Compared with cement concrete pavement, asphalt pavement has a smooth surface without joints, small driving vibration, low noise, fast open traffic, simple maintenance, suitable for pavement phased construction, and is an important structural form of pavement in China.

Disadvantages: It is high temperature sensitivity. In summer, the intensity decreases, and if it is not well controlled, the road surface will be soft, oily or shear and damaged. At low temperatures, the asphalt material becomes brittle, which can cause cracking of the road surface.

Asphalt pavement refers to the general term of pavement that uses asphalt as a binder to pave the surface layer. It is a pavement structure that paves a certain thickness of asphalt mixture as a surface layer on a flexible base and a semi-rigid base layer.

Asphalt pavement is divided into two categories: embedded and compacted according to its strength composition principle. The interlocking asphalt pavement is paved with asphalt surface treatment, asphalt through-person type and asphalt gravel paving, which belongs to the sub-high-grade pavement. Compact asphalt pavement is paved with all kinds of asphalt concrete, asphalt mastic gravel, etc., which has large compactness and small pores, and is the asphalt pavement with the highest strength and stability, which is a high-grade pavement.

The void ratio can reach 20-25%.Low noise and drainable.

1. Impervious asphalt pavement, simply put, asphalt concrete, cement concrete, stone plate or cement brick paved pavement can become impervious asphalt pavement, although it is neat and durable, but the biggest disadvantage is impermeable, drainage depends on underground drainage pipes, rainwater is directly treated as sewage when rainfall, blocking the replenishment of rainwater to groundwater, which is not conducive to the generation of groundwater.

Rainwater and sewage are easy to accumulate on the road surface and dissolve into the city, and the pollutants seriously affect the urban sanitation. In addition, this kind of pavement will absorb, store and reflect the heat of the sun, which will increase the average temperature of the ground, aggravate the formation of urban heat island effect, and easily cause negative environmental and ecological effects. It is not conducive to ecological balance and environmental protection.

2. Permeable asphalt road, permeable asphalt pavement, also known as "drainage noise reduction pavement", is a new type of road structure, which adds high-viscosity modified asphalt, slaked lime and fiber to the raw materials, which can not only regulate the urban climate, reduce the surface temperature, and help alleviate the urban heat island phenomenon, but also make full use of rain and snow precipitation, increase the relative humidity of the surface, and supplement the depleted groundwater resources in the urban area.

Thus the "reservoir" function of permeable roadbed is played; It also has a complete drainage system, so that the rainwater infiltration, the reflection of the road water is reduced, and the phenomenon of motor vehicle skidding in rainy days is also greatly reduced, which effectively reduces the blasting sound caused by the friction between high-speed vehicles and the road surface.

Note: Asphalt is easy to age, and the dark color of the pavement is easy to absorb heat and produce a certain degree of dissolution. However, you can use modified asphalt and these problems can be solved to a certain extent.

The asphalt road is comfortable, and the tires have strong grip, but the cost of oil (soft road surface resistance is high), and the cost of laying and maintenance is high. The comfort of the cement road is poor, the car is fuel-efficient, and the laying and maintenance costs are low.

Permeable asphalt pavement is also called "drainage noise reduction pavement", is a new type of pavement structure, mixed with specially developed modified asphalt, slaked lime, fiber in the raw materials, can effectively reduce the blasting sound caused by high-speed vehicle friction with the road surface, and itself has a complete drainage system, so that the rainwater infiltration, the reflection of water on the road has become history, and the phenomenon of motor vehicle skidding in rainy days will also be greatly reduced. The impervious asphalt road uses ordinary asphalt, and the raw materials are not mixed with slaked lime and fiber, which can not effectively reduce the blasting sound caused by the friction between the high-speed vehicle and the road surface, and does not have a complete drainage system by itself, can not make the rainwater infiltrate, can not avoid the reflective phenomenon of water on the road, and the motor vehicle is easy to slip in rainy days.

Answer]: A This question examines the construction of asphalt pavement permeability, adhesive layer and sealing layer. The function of the permeable layer: in order to make the asphalt surface course and the base core layer well combined, pour Huai Qinghe emulsified asphalt, coal asphalt or liquid asphalt on the base layer to form a thin layer of lead that penetrates the surface of the base layer.