Impact of calcined bauxite aggregates on the polishing resistance and skid resistance performance of SMA-7 asphalt mixtures
Pengfei Li, Lingkun Kong, Nan Mao, Chenwei Gu, Jiaolong Ren, Jiaolong Ren
TL;DR
This study shows that using high-grade calcined bauxite aggregates in SMA-7 asphalt mixtures improves skid resistance and durability, especially after prolonged polishing.
Contribution
The study introduces calcined bauxite aggregates as a superior alternative to limestone for enhancing polishing resistance and skid performance in SMA-7 mixtures.
Findings
88# calcined bauxite aggregates show 30% slower PSV decay than limestone after 120,000 polishing cycles.
CB mixtures retain 29.4–36.3% higher residual friction than limestone mixtures after prolonged polishing.
High-grade CB aggregates improve high-temperature stability and long-term skid resistance in SMA-7 mixtures.
Abstract
High-performance anti-skid asphalt mixtures are essential for improving skid resistance and pavement durability. This study investigates the skid resistance performance of small-aggregate-size SMA-7 asphalt mixtures using calcined bauxite (CB) aggregates. Four types of aggregates—75#, 85#, and 88# CB and limestone—were used in the mixture preparation. Various laboratory tests, including pavement performance, Polished Stone Value (PSV) of aggregates, three-wheel polishing, and dynamic friction tests, were conducted to evaluate the performance and friction characteristics of the mixtures at various polishing stages. The results indicate that the optimal coarse-to-fine aggregate ratio for SMA-7 is 75:25, with a maximum particle size of 6.35 mm. The PSV of 88# CB aggregate stabilizes after 120,000 polishing cycles, exhibiting a decay rate 30% slower than that of limestone aggregates. Among…
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Taxonomy
TopicsBrake Systems and Friction Analysis · Asphalt Pavement Performance Evaluation · Railway Engineering and Dynamics