Colored asphalt is mixed with various colored stones, pigments and additives at a specific temperature to form various colored asphalt mixtures, which are then paved and rolled. Form a concrete pavement with certain strength and road performance.

Advantages of colored asphalt

(1) It has bright and long-lasting color, does not fade, can withstand high temperatures of 77°C and low temperatures of -23°C, and is easy to maintain.

(2) The Marshall stability of fine-grained asphalt mixture is 7.5kN, and the flow value is 20~40. The fine-grained AC10 asphalt mixture has a Marshall stability of 11.9kN and a flow value of 30.

(3) It has strong sound absorption function. When the car tires roll at high speed on the road, they will not produce strong noise due to air compression, and they can also absorb other noise from the outside world.

(4) It has good road performance. Under different temperatures and external environments, its high temperature stability, water damage resistance and durability are very good, and there is no deformation or asphalt film. peeling off and other phenomena, and has good adhesion with the base layer.

Main materials for colored asphalt concrete pavement

The selection of rough materials for colored asphalt pavement should take into account both the color and the general performance requirements of pavement materials. In order to ensure the durability of the colored pavement color, the rough material should be selected to be consistent with or as close as possible to the color of the pigment. Including limestone, basalt, diabase, granite, etc. The colors are generally red, yellow, and green. Taking into account the limitations of the source, nature, processing and other aspects of colored stones, the technical indicators of colored stones used in urban roads (such as crushing value, Los Angeles abrasion loss, polishing value, etc.) can be based on ordinary aggregates according to specific conditions. Relax appropriately. In addition, in order to ensure sufficient adhesion between the aggregate and the cementing material (grade no less than 4), it is best to choose alkaline stone (such as limestone).

Fine materials should be made of machine-made sand or stone chips rolled from the same stone as coarse materials. The fine materials must be clean, and indicators such as sand equivalent and mud content must meet technical requirements. Excessive mud content will reduce the bonding force between asphalt and mineral materials and affect the effect of colored pavement.

Technical indicators of colored asphalt mixture

Colored cementing material. There are two ways to obtain colored cement: one is to use an appropriate solvent to remove the black asphaltene from the petroleum asphalt, leaving other components with lighter colors, combined with modified materials, and adding special pigments of a certain color. The asphalt can be turned into different colors such as red, yellow, blue, green, camel, etc. as required. However, the production process is complex, requires a large investment in capital and equipment, and causes serious pollution, which is not conducive to promotion. The second is to use modern petrochemical products to manually prepare light-colored cementing materials that have properties comparable to asphalt.