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Corresponding Author

李波,男,硕士研究生.E-mail:970457275@qq.com

Abstract

Cast asphalt mixture is the most widely used material for the pavement of long-span steel bridge decks, and the special asphalt binder cannot be produced and used in small batches. The wet modification process is obviously not suitable for the production of the cast asphalt mixture during the operation and maintenance period. In this paper, according to the requirements of cast asphalt mixture and its binder, combined with the requirements of the dry modification process, the developed direct injection modifier was employed to conduct the mix design of cast asphalt mixture and tests of the fluidity, penetration and increment, low-temperature limit bending and tensile strain, and fatigue properties. The properties of cast asphalt mixture were compared with asphalt mixture produced by wet process. The results show that the properties of the cast asphalt mixture prepared by the dry process meet the requirements of the current specification, which is basically the same as that of the wet process, and the fluidity is relatively good; the high temperature strength and low temperature crack resistance are slightly lower. The fatigue properties of the two dry processes are significantly different, and the difference in fatigue times at 1 000 με is 50.7%, but they both are lower than that of the wet process. The internal damage of the two kinds of cast asphalt mixture is more and more independent, and the change ratio of dissipated energy Rw × 10−4 tends to [−1, 1], but the wet process is better than the dry process in the early stage.

Publication Date

1-18-2024

DOI

10.14048/j.issn.1671-2579.2022.06.036

First Page

193

Last Page

196

Submission Date

May 2025

Reference

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