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Corresponding Author

郝治hao zhi

Abstract

To clarify the influence of aggregate density differences and forming temperature on the mix ratio of asphalt mixtures, this paper first demonstrated the reasons for the change in volume gradation when weighing coarse and fine aggregates with large density differences. Through laboratory tests, it was confirmed that the differences in aggregate density and forming temperature had an impact on the optimal oil-to-stone ratio of asphalt mixtures. Then, Marshall specimens were formed by mass gradation and volume gradation, respectively, and their volume indicators were calculated. Meanwhile, the influence of compaction temperature on the volume indicators of Marshall specimens was analyzed. Finally, the road performance of the mixtures before and after density correction was studied. The results show that both the aggregate density differences and the molding temperature will affect the optimal oil-to-stone ratio of the mixtures. Increasing the compaction temperature will increase the density of asphalt mixtures and saturation of asphalt, reduce the void ratio and mineral void ratio, and lower the optimal oil-to-stone ratio of asphalt mixtures. Density correction of AC-13 asphalt mixture can reduce the optimal oil-to-stone ratio by 0.2%. Within the rolling temperature range of 150–180 °C, for every 10 °C increase, the optimal oil-to-stone ratio decreases by nearly 0.1%. When coarse and fine aggregates with significant density differences are used, whether density correction is carried out has a relatively obvious impact on the road performance of asphalt mixtures.

Publication Date

6-18-2022

DOI

10.14048/j.issn.1671-2579.2022.03.032

First Page

180

Last Page

185

Submission Date

May 2025

Reference

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