Drainage type modified asphalt coarse aggregate discontinuous semi-open graded bituminous stabilized macadam

Abstract

The present invention belongs to the field of transportation engineering, and discloses drainage type modified asphalt coarse aggregate discontinuous semi-open graded bituminous stabilized macadam. A mixture is composed of SBS modified asphalt, coarse aggregate, fine aggregate and mineral powder (or a certain amount of fiber can be added), the void ratio is 10%-13%, and the asphalt-aggregate ratio is 3.5%-4.5%. The mixture has certain drainage ability, and the anti-reflection crack performance, the anti-fatigue performance and the anti-rutting resistance are obviously improved compared with matrix asphalt AC-25 and matrix asphalt ATB-25. An important role is played in guaranteeing the pavement performance and the service life of an asphalt pavement when the drainage type modified asphalt coarse aggregate discontinuous semi-open graded bituminous stabilized macadam is applied to the structure of the asphalt pavement.

Description

technical field [0001] The invention relates to a drainage type modified asphalt coarse aggregate discontinuous semi-open gradation asphalt stabilized gravel, which belongs to the field of transportation engineering. Background technique [0002] Traditional asphalt-stabilized macadam mainly includes two types: ① densely graded asphalt-stabilized macadam (ATB), with a design void ratio of 3-6%, which belongs to the skeleton-dense structure; ② open-graded asphalt-stabilized macadam (ATPB), The design porosity is greater than 18%, which belongs to the skeleton-void structure. ATPB focuses on drainage capacity, and the design void ratio is relatively large, making its mechanical properties, water stability, fatigue resistance and deformation resistance relatively poor. The ATB mixture has good mechanical properties, fatigue resistance, and anti-reflection crack performance, but it is almost impermeable. [0003] In the design and construction of asphalt pavement structures, m...

AI Technical Summary

Problems solved by technology

However, the usual ATPB water stability is insufficient, and the crack resistance of CTPB is poor, so the use effect is not ideal.

[0005] The current design theory and design method of semi-rigid base asphalt pavement is based on the ideal state of continuous semi-rigid base and no cracks. However, the actual semi-rigid base will inevitably shrink due to temperature and dry shrinkage. Cracking occurs, and the cracks in the semi-rigid base will gradually reflect upward under the combined action of traffic load and temperature changes, causing cracking of the entire asphalt layer

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