Asphalt concrete, commonly known as asphalt concrete, is a mixture made by manually mixing mineral materials (crushed stone or crushed gravel, stone chips or sand, mineral powder, etc.) with a certain proportion of road asphalt materials under strictly controlled conditions.
According to the different binders used, asphalt concrete can be divided into two categories: petroleum asphalt and coal asphalt; In some countries or regions, natural asphalt is also used or mixed.
Depending on the type of aggregate used, it can be divided into several categories: crushed stone, gravel, sandy, and slag, with crushed stone being the most commonly used.
Depending on the size of the large particles of the mixture, it can be divided into coarse particles (35 to 40 mm or less), medium particles (20 to 25 mm or less), fine particles (10 to 15 mm or less), and sand particles (5 to 7 mm or less).
Jinan asphalt concrete can be divided into dense gradation, semi open gradation, open gradation, and intermittent gradation according to the different compactness of the mixture. The dense graded crushed stone mixture of hot mix and hot paving is durable, has high strength, and has good integrity. It is a representative material for building high-grade asphalt pavement, and is widely used.
Various countries have different specifications for asphalt concrete. The technical specifications for hot mix and hot paving asphalt mixtures formulated in China refer to those with a void ratio of 10% or less as asphalt concrete, and are further subdivided into Type I and Type II, with a void ratio of 3-6% for pedestrian roads; Type II: 4-10%; Those with a void ratio of more than 10% are semi open graded, and the representative type is asphalt stabilized crushed stone; After compaction, the mixture with a porosity of more than 15% is of open graded type, and the representative type is asphalt wearing course mixture; For discontinuous graded asphalt mixture, it refers to a mixture that lacks one or several grades in the gradation and is formed with discontinuous gradation. The representative type is asphalt horseshoe macadam (SMA). The physical and mechanical indexes of asphalt concrete include stability, flow value, porosity, etc.
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