Asphalt mixture can be divided into asphalt concrete mixture and asphalt macadam mixture. Hot mix and hot paving asphalt mixture is suitable for asphalt pavement of various grades of highways. Asphalt concrete mixture should be used to pave the asphalt surface of expressway and first-class highway, and asphalt macadam mixture is only suitable for transition layer and leveling layer. Asphalt concrete mixture should be paved on the upper layer of asphalt pavement of other grade highways.
Asphalt stabilized macadam belongs to asphalt macadam mixture with skeleton gap structure. It consists of continuous open graded mineral aggregate and asphalt. There are many coarse aggregates, which are closely connected with each other, but the number of fine aggregates is not enough to completely fill the gaps, forming a skeleton gap structure. This kind of asphalt mixture has high internal friction angle, but low cohesion, which is less affected by the change of asphalt material properties, so it has good thermal stability, but the adhesion between asphalt and mineral materials is small, the porosity is large and the durability is poor.
When it is used on the pavement, it is only applicable to the second high-grade pavement, which belongs to the third and fourth grade highways.
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What is asphalt stabilized macadam?
Asphalt stabilized macadam mixture (hereinafter referred to as asphalt macadam) is composed of mineral aggregate and asphalt with certain grading requirements. According to the porosity, the maximum particle size of aggregate and the amount of mineral powder added, it can be divided into dense asphalt macadam, open graded asphalt macadam and semi-open graded asphalt macadam.
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What's the difference between asphalt concrete and asphalt macadam?
1. Define different asphalt concrete: asphalt concrete, commonly known as asphalt concrete, is a mixture made by manually selecting mineral materials (crushed stone or gravel, stone chips or sand, mineral powder, etc.). ) and a certain proportion of road asphalt materials are strictly controlled. Asphalt macadam: Asphalt stabilized macadam mixture (hereinafter referred to as asphalt macadam) is a mixture composed of mineral aggregate and asphalt with certain grading requirements. According to the porosity, the maximum particle size of aggregate and the amount of mineral powder added, it can be divided into dense graded asphalt macadam (ATB), open graded asphalt macadam (OGFC surface course and ATPB base course) and semi-open graded asphalt macadam (am). 2. Asphalt concrete with different structures: The strength of asphalt mixture is mainly manifested in two aspects. One is the cohesive force of the binder formed by asphalt and mineral powder; The other is the internal friction and locking force between aggregate particles. The huge surface area of fine mineral powder particles (mostly less than 0.074 mm) makes asphalt materials form films, thus improving the bonding strength and temperature stability of asphalt materials; The locking force is mainly generated between coarse aggregate particles. When choosing asphalt concrete mineral aggregate gradation, we should give consideration to both, so that the mixture can form a dense, stable, suitable smoothness and durable pavement after adding appropriate amount of asphalt. Asphalt macadam: skeleton void structure: coarse aggregate accounts for a large proportion, with little or no fine aggregate, and the coarse aggregate can be locked with each other to form a skeleton with strong embedding ability; However, too little fine aggregate is not easy to fill the large gap formed between coarse aggregates. The internal friction angle φ of the structure is large, but the cohesion C is also small. Asphalt macadam mixture (am) and OGFC drainage asphalt mixture are typical examples of this structure. 3. Asphalt macadam with different mineral aggregate gradation: The asphalt macadam mixture contains less fine mineral aggregate and mineral powder, and the surface is rough after compaction. Asphalt concrete: The aggregate gradation of asphalt concrete mixture is strict, there are more fine aggregate and mineral powder, and the compacted surface is delicate. Baidu encyclopedia-asphalt macadam Baidu encyclopedia-asphalt concrete
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