Performance investigation on asphalt macadam base with different gradations;

Coarse aggregates relative proportion of asphalt macadam;

The methods for testing density of asphalt macadam with large void ratio are analyzed,the defect of wax sealing method and volume method are also discussed,these two methods were just the ones recommended by specifications for testing bulk density of asphalt macadam,and the method of wax sealing is modified.

Bailey gradation design method is applied to the gradation design for asphalt treated base.

Structure I is with the traditional semi-rigid base, structure II is with graded crushed stone as a transition layer and the structure III is with asphalt treated base as the upper base.

According to the documents and results of indoor experiments,this paper recommended proportioning of two kinds of permeable base materials which are composed of asphalt-aggregate of grading type Ⅱ and cement-aggregate of grading type Ⅵ respectively.

Bring forward our own resolvent methods of the isolation of asphalt detritus composite through the construction of pavement.

When a bituminous macadam pavement with rubber powder is laid on an ol d asphalt pavement,the reflex crack could be postponed and prevented,also the life of the pavement could be prolonged.