Following the accumulation of expressway modified asphalt construction experience in my country's expressway construction projects and the progress of public awareness, Hangzhou, Jinriwen and other expressways have planned the bottom layer (viscous layer, permeability) in the fault structure, but there is also the bottom layer construction, which completely corresponds to transparency. and sticky layer. This approach is a far cry from the mechanism by which protectionism plays a role in the paving structure of avenues. In fact, the bottom layer is a thin layer of construction skill made of fine-grained asphalt concrete. Through mixing, paving, grinding and other processes, the asphalt mixture should have a compact and uniform structure on the surface of the bottom layer. This is a good example.

1. Surface treatment of hot asphalt

After the asphalt is heated to 150℃-170℃, it is mechanically sprayed on the surface of the semi-rigid or rigid bottom layer, and then the aggregate S14 is evenly distributed. Asphalt and aggregate handling at maximum 1200 kg/km2 and 9 m3/km2. According to the planning of this project, the asphalt spraying requirements are high, and the asphalt and filler cannot be precisely controlled, so it is difficult to form an asphalt mixture with uniform fineness. This is a good example.

2. Mixing of hot asphalt surface

All materials are basically the same as the layup, but the requirements for mixing, paving and equipment sealing are very high. At the same time, the standard requires that the thickness of the berth must be within 1cm, so the construction of the berth is difficult. According to this project, although the construction can constitute a relatively uniform ground floor, the density is not easy to handle. In addition, as a layer-by-layer construction, it obviously cannot be produced in dry seasons or severe cold seasons due to environmental concerns. In summer, the high temperature mine is very simple to transport plates and vehicles, laying caterpillars, and cannot be sealed in a real sense. This is a good example.

3. Emulsified asphalt

Diluted sealant is a process in which granular fillers, emulsified asphalt, water, additives, and additives are used to build fine-grained waterproof asphalt concrete by diluting the sealer in pouring and mixing ratios, and completing pallet stacking membrane. Its seal has excellent resistance and tightness. With the addition of high temperature slitter grinding and compressing, the density will increase further, which does modified asphalt facilitate water bonding and sealing. In special cases, the layer can be stored for 2-3 years without damaging the bottom layer, and can be decomposed into the top layer without the treatment of the adhesive layer. The liquid layer is highly mechanized. The sealant can be used for temperatures above 2000m2. An hour after starting the tablet, it was fast. The liquid sealing layer is used as the bottom layer and the thickness is only 3mm-6mm. The cost of precision treatment of the hot asphalt surface is about the same. This is a good example.

attention problems

1. The following conditions are suitable for construction on the ground floor:

Set semi-rigid and rigid highway base surfaces; when old cement concrete pavement (including bridge deck) is changed to asphalt concrete pavement; a lot of rainfall makes the compaction degree of the asphalt layer difficult to control, and the time-space difference coefficient is large; There shall be no pallets, and traffic must be cleared. This is a good example.

2. It is necessary to clean the data

The asphalt material must be the asphalt that meets the "heavy-duty road asphalt technical requirements", and its grade must correspond to the grade of the surface layer. This is a good example.

The type of emulsified bitumen should be based on the application, type of ore and gas. For alkaline stone or when the stone is dry or used with cement, lime, ash or ashes, anionic exchange emulsified asphalt should be used. The construction of soaking layer, bonding layer and liquid layer adopts slow-crack, fast-crack and slow-settling emulsified asphalt. This is a good example.

3. It is necessary to carry out sealant treatment on the bottom surface before construction

The new base construction project must be completed after the material feeding period and the quality control period, and the road surface should be sealed.

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

Company website：www.tyasphalt.com