Jinan asphalt concrete, commonly known as asphalt concrete, is a mixture of manually selected mineral aggregate (crushed stone or crushed gravel, stone chips or sand, mineral powder, etc.) with a certain proportion of road asphalt materials under strict control.
Asphalt concrete can be divided into petroleum asphalt and coal asphalt according to different binders; Some countries or regions also use or mix natural asphalt.
According to different types of aggregate used, it can be divided into gravel, gravel, sandy and slag, and gravel is the most widely used.
According to the size of the large particles of the mixture, it can be divided into coarse particles (less than 35-40 mm), medium particles (less than 20-25 mm), fine particles (less than 10-15 mm), and sand particles (less than 5-7 mm).
According to the different compactness of the mixture, it can be divided into dense grading, semi-open grading, open grading and discontinuous grading. Among them, the hot-mixed and hot-paved dense graded crushed stone mixture is durable, high strength and good integrity. It is a representative material for building high-grade asphalt pavement and widely used.
Different countries have different specifications for asphalt concrete. The technical specifications for hot-mix and hot-laid asphalt mixture formulated in China are called asphalt concrete with a void ratio of 10% or less, and are subdivided into Type I and Type II, with a void ratio of 3~6% (2% - 6% for pedestrian roads); Type II is 4~10%; Those with a void ratio of more than 10% are semi-open graded, and the representative type is asphalt stabilized macadam;
After compaction, the porosity is more than 15%, which is open-graded type, and the representative type is asphalt wearing course mixture; For discontinuous graded asphalt mixture, it refers to the mixture formed by the lack of one or several grades in the gradation, and the representative type is asphalt horseshoe macadam (SMA). The physical and mechanical indexes of asphalt concrete include stability, flow value and porosity.
The above is the relevant answer about what material asphalt concrete is. If you have any doubts or needs about it, please come to our website http://www.ycgjglcl.com consulting service