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<p>Among various asphalt modifiers, Buton rock asphalt (BRA) has garnered considerable attention due to its low cost, strong compatibility with petroleum asphalt, and superior mechanical and rheological properties. Despite these advantages, BRA-modified asphalt mixtures often suffer from insufficient low-temperature cracking resistance, which limits their broader application. To date, the preparation of BRA in engineering applications has predominantly relied on the conventional “dry mixing” method. However, studies have shown that this traditional approach fails to fully realize the modification potential of BRA. As such, the objective of this study is to optimize the production process of BRA-modified asphalt mixtures. To mitigate uneven asphalt film thickness caused by conventional mixing, a novel procedure was proposed in which virgin aggregates are first mixed with part of the asphalt, followed by BRA and the remaining asphalt, with the asphalt proportions determined by the specific surface areas of the aggregates and BRA minerals. Laboratory performance tests and layered extraction analyses demonstrate that the refined mixing procedure substantially enhances the uniformity of asphalt distribution within the mixture, thereby significantly improving its low-temperature performance and moisture resistance. In addition, a novel concept of preheating BRA during production was proposed, and its effectiveness was validated through molecular dynamics (MD) simulations and laboratory experiments. MD simulation results showed that increasing the heating temperature of BRA enhances the adhesion between natural asphalt and aggregates, with optimal adhesion observed at 85&#xa0;°C. Moreover, elevated temperatures accelerate the diffusion of natural asphalt into the base asphalt, thereby improving the overall modification effect. Laboratory performance tests confirmed the benefits of preheating BRA during the preparation of BRA-modified asphalt mixtures. Considering both mixture performance and energy consumption, a BRA heating temperature of 85&#xa0;°C is recommended. This study is expected to provide a scientific basis for optimizing BRA-modified asphalt mixture production and improving BRA’s modification efficiency and its contribution to mixture performance.</p>

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Refined Mixing Strategy for Buton Rock Asphalt Mixtures: Optimization of Heating Temperature and Mixing Sequence

  • 期刊论文

  • 发表日期：

    2026年3月31日

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  • Pengyu Shen

摘要

Among various asphalt modifiers, Buton rock asphalt (BRA) has garnered considerable attention due to its low cost, strong compatibility with petroleum asphalt, and superior mechanical and rheological properties. Despite these advantages, BRA-modified asphalt mixtures often suffer from insufficient low-temperature cracking resistance, which limits their broader application. To date, the preparation of BRA in engineering applications has predominantly relied on the conventional “dry mixing” method. However, studies have shown that this traditional approach fails to fully realize the modification potential of BRA. As such, the objective of this study is to optimize the production process of BRA-modified asphalt mixtures. To mitigate uneven asphalt film thickness caused by conventional mixing, a novel procedure was proposed in which virgin aggregates are first mixed with part of the asphalt, followed by BRA and the remaining asphalt, with the asphalt proportions determined by the specific surface areas of the aggregates and BRA minerals. Laboratory performance tests and layered extraction analyses demonstrate that the refined mixing procedure substantially enhances the uniformity of asphalt distribution within the mixture, thereby significantly improving its low-temperature performance and moisture resistance. In addition, a novel concept of preheating BRA during production was proposed, and its effectiveness was validated through molecular dynamics (MD) simulations and laboratory experiments. MD simulation results showed that increasing the heating temperature of BRA enhances the adhesion between natural asphalt and aggregates, with optimal adhesion observed at 85 °C. Moreover, elevated temperatures accelerate the diffusion of natural asphalt into the base asphalt, thereby improving the overall modification effect. Laboratory performance tests confirmed the benefits of preheating BRA during the preparation of BRA-modified asphalt mixtures. Considering both mixture performance and energy consumption, a BRA heating temperature of 85 °C is recommended. This study is expected to provide a scientific basis for optimizing BRA-modified asphalt mixture production and improving BRA’s modification efficiency and its contribution to mixture performance.