AC, voids rate 3~5%, bitumen content 4.5~5%, used for any layer
SMA, voids rate 3~4%, bitumen content depending on bulk relative density, density 2.9 bitumen content >=5.6; 2.8>=5.8; 2.7>=6.0, 2.6>=6.2, used for top layer

急问沥青用量范围