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Aggregate grading design of skeleton dense hydraulic asphalt concrete
Highlights Optimal skeleton gradation of coarse aggregate was determined by stage filling vibration compaction based on interference theory. New gradation curve of coarse and fine aggregate was established by the method of gradation synthesis. Performances test were carried out to verify the advantages and disadvantages of the new grading curve design method.
Abstract The aim of this study was to improve the performance of hydraulic asphalt concrete while reducing the amount of asphalt required. Thus, the aggregate gradation design of asphalt concrete was investigated. As fine aggregates and coarse aggregates perform different functions in an asphalt mixture, coarse aggregates (2.36–19 mm) and fine aggregates (0.075–2.36 mm) were considered differently for the gradation design. According to interference theory, the optimal skeleton gradation of the coarse aggregates was determined by step-by-step filling vibration compaction. A mathematical model based on gradation fractal theory and the Dinger–Funk equation was obtained for the fine aggregate gradation. Subsequently, coarse and fine aggregates were designed by gradation synthesis, and the characteristics of the new gradation design were examined by comparing the performance of the designed gradation with the Purong Ding gradation formula. The results showed that the coarse aggregate filling process followed the process of accidental interference–inevitable interference–new round of filling cycle. A critical value of secondary aggregate was observed, at which the aggregate and parent substance were in equilibrium; however, the optimal skeleton did not correspond to the maximum density of the aggregate. Compared with the new grading curve, the grading curve of the Purong Ding formula had more large-size aggregates (9.5–19 mm), whereas the middle-grade aggregates (2.36–9.5 mm) were fewer. In the new grading curve test group, the porosity and flow index were slightly better than those of the control group in the fine aggregate rate of 30–60 %. Meanwhile, the stability index increased significantly, with an average increase of 11.3 % compared with the control group. The design of a new grading formula provides a new approach for designing hydraulic asphalt concrete with improved performance.
Aggregate grading design of skeleton dense hydraulic asphalt concrete
Highlights Optimal skeleton gradation of coarse aggregate was determined by stage filling vibration compaction based on interference theory. New gradation curve of coarse and fine aggregate was established by the method of gradation synthesis. Performances test were carried out to verify the advantages and disadvantages of the new grading curve design method.
Abstract The aim of this study was to improve the performance of hydraulic asphalt concrete while reducing the amount of asphalt required. Thus, the aggregate gradation design of asphalt concrete was investigated. As fine aggregates and coarse aggregates perform different functions in an asphalt mixture, coarse aggregates (2.36–19 mm) and fine aggregates (0.075–2.36 mm) were considered differently for the gradation design. According to interference theory, the optimal skeleton gradation of the coarse aggregates was determined by step-by-step filling vibration compaction. A mathematical model based on gradation fractal theory and the Dinger–Funk equation was obtained for the fine aggregate gradation. Subsequently, coarse and fine aggregates were designed by gradation synthesis, and the characteristics of the new gradation design were examined by comparing the performance of the designed gradation with the Purong Ding gradation formula. The results showed that the coarse aggregate filling process followed the process of accidental interference–inevitable interference–new round of filling cycle. A critical value of secondary aggregate was observed, at which the aggregate and parent substance were in equilibrium; however, the optimal skeleton did not correspond to the maximum density of the aggregate. Compared with the new grading curve, the grading curve of the Purong Ding formula had more large-size aggregates (9.5–19 mm), whereas the middle-grade aggregates (2.36–9.5 mm) were fewer. In the new grading curve test group, the porosity and flow index were slightly better than those of the control group in the fine aggregate rate of 30–60 %. Meanwhile, the stability index increased significantly, with an average increase of 11.3 % compared with the control group. The design of a new grading formula provides a new approach for designing hydraulic asphalt concrete with improved performance.
Aggregate grading design of skeleton dense hydraulic asphalt concrete
Li, Yanlong (author) / Liu, Jihan (author) / Liu, Yunhe (author) / Zhou, Heng (author) / Wen, Lifeng (author) / Chen, Junhao (author)
2022-12-09
Article (Journal)
Electronic Resource
English
Aggregate grading design of skeleton dense hydraulic asphalt concrete
| Elsevier | 2023
Aggregate grading design for porous asphalt
| British Library Conference Proceedings | 1996
| Trans Tech Publications | 2011