Compared with cement concrete rigid pavement, asphalt pavement has the characteristics of flat surface, wear resistance, simple construction and maintenance, comfortable driving, low noise and less dust, and is widely used in all levels of highway pavement. What are the main reasons for the color change of asphalt pavement during use?
The long-term use of asphalt pavement is also the aging process of asphalt concrete materials. With the gradual decline of the road performance of various constituent materials, the color of the pavement will naturally change.
As the asphalt mixture just produced is completely wrapped on the stone surface, it is usually black as a whole. After paving, the large-size aggregate is fully bonded with the fine aggregate, which affects the reflection of light. Therefore, people are dark in visual perception and have no luster. After a period of time, the fine aggregate on the surface of large particle size aggregate is lost by wheel friction and water scouring, and the surface of large aggregate becomes smooth, the reflective effect is enhanced, and people feel that the road is dark and shiny. After a period of time, due to moisture, oxygen, ultraviolet and other factors, the asphalt will age, the asphalt on the aggregate surface will be rubbed off, and the color of the stone itself will be exposed. With a large amount of dust gathering on the pavement, the asphalt pavement looks gray white on the whole.
The color of the constituent material itself
Asphalt concrete is mainly made of asphalt, stone, mineral powder and other materials, which are processed under strict control conditions according to a certain proportion. The color of asphalt determines the color of asphalt pavement, but the color gradient difference in the use of ordinary asphalt pavement is not obvious. The proportion of stone is usually more than 90%, so it has a great impact on the color difference of ordinary asphalt pavement in various regions after aging.
Difference between grading category and production process
The graying and uneven color of asphalt concrete caused by quality control (too short mixing time or insufficient asphalt dosage) in the production process belongs to the unqualified product quality and is generally not used for construction. It should be noted that the production grading of individual manufacturers is unreasonable, and the proportion of fine aggregate is reduced to reduce the amount of asphalt. After the asphalt pavement is paved, the color is generally bright, but the void ratio is too large, and the water stability is reduced.
Jinan asphalt manufacturers believe that SMA asphalt pavement has high requirements for material quality and production and construction technology, and quality problems will occur if asphalt mixture is not paid attention to in the production, transportation and paving process. Therefore, the material quality control is relatively strict, which is conducive to improving the construction quality of asphalt pavement.
The main reasons for the color change of asphalt pavement in the process of use are explained to you from several aspects. If you need this, please pay attention to our website http://www.ycgjglcl.com , contact us to purchase!