The indexes and requirements of macadam for expressway pavement are relatively strict. The macadam for expressway pavement is also called aggregate, which is divided into coarse aggregate and fine aggregate.
Coarse aggregate of macadam asphalt mixture for expressway pavement is generally rolled from various rocks. In case of stone shortage, the pebbles can also be crushed, and some metallurgical slag (such as alkaline blast furnace slag) can also be used, but it can only be used after confirming that it is harmless to asphalt concrete.
The quality requirements of coarse aggregate used in different structural layers of macadam asphalt pavement for expressway pavement are also different. Fine aggregate of hot mix asphalt mixture generally adopts natural sand or artificial sand, and stone chips can also be used to replace it in areas lacking sand. However, the amount of stone chips should not exceed the amount of sand for the surface course or anti sliding surface course of highways. Fine aggregate shall also be clean, dry, free from weathering and impurities, and have good adhesion with asphalt.
At present, the macadam crushers for expressway pavement on the market have the problems of inconvenient maintenance and long maintenance time. In order to solve this problem, SMMVIK Machinery has concentrated its R&D efforts to develop a new type of gravel crusher for pavement of Expressway through communication with customers and field investigation, which is easy to maintain, greatly saving maintenance time and workload, and also improving work efficiency to a certain extent.
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