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Various Indexes And Requirements Of Macadam For Expressway Pavement

Last Update:2020-05-07 18:06:49

The coarse aggregate of macadam asphalt mixture for expressway pavement is generally composed of macadam rolled from various rocks. In the case of stone shortage, pebble can also be crushed by rolling; or some metallurgical slag (such as alkali blast furnace slag) can 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 are also different. The fine aggregate of hot mix asphalt mixture generally adopts natural sand or artificial sand. In the area lacking sand, stone chips can also be used instead. However, for the surface layer or anti sliding surface layer of high-speed highway, the amount of stone chips should not exceed the amount of sand. The fine aggregate shall also be clean, dry, free from weathering and impurities, and have good adhesion with asphalt.

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