Xue Jinshun, Chen Xiao, Zhao Wei, Wang Yuanyuan
Hubei Key Laboratory of Vehicle-infrastructure Cooperation and Traffic Control, Xiangyang, China.
School of Civil Engineering and Architecture, Hubei University of Arts and Science, Xiangyang, China.
PLoS One. 2025 Sep 17;20(9):e0331954. doi: 10.1371/journal.pone.0331954. eCollection 2025.
The stone-on-stone contact-interlocked skeleton structure of stone mastic asphalt (SMA) mixtures is crucial for the effective design of the mixture. However, existing skeleton structure discrimination standard (VCAmix < VCADRC) for SMA mixture gradation design is proven to necessitate calibration. To address this, a method was developed to analyse the influence of structural parameters on the high-temperature performance of SMA-13 mixture. And a skeleton structure discrimination standard for the SMA mixture was proposed and subsequently verified through the high-temperature performance of the SMA-13 mixture. The results indicate that variations in testing methods, compaction efforts, and coarse aggregate breakage lead to discrepancies between the key parameters VCADRC and VCAmix when evaluating the skeleton structure discrimination standard for SMA mixtures. Therefore, a volume method was introduced to the VCAmix expression, calculating it using the volume of the cylindrical specimen compacted by the VTM method. Additionally, the VCAmix < 0.95VCADRC(n=25) is recommended as the skeleton structure discrimination standard for SMA mixture gradation design. Which exhibited more prominent high-temperature performance (8% higher shear strength and 15% greater dynamic stability) than the SMA mixtures designed using VCAmix < VCADRC(n=25) as the skeleton structure discrimination standard.
间断级配沥青玛蹄脂碎石混合料（SMA）的石-石接触联锁骨架结构对于混合料的有效设计至关重要。然而，现有的SMA混合料级配设计骨架结构判别标准（VCAmix ＜ VCADRC）已被证明需要校准。为了解决这一问题，开发了一种方法来分析结构参数对SMA-13混合料高温性能的影响。并提出了SMA混合料的骨架结构判别标准，随后通过SMA-13混合料的高温性能进行了验证。结果表明，在评估SMA混合料的骨架结构判别标准时，测试方法、压实功和粗集料破碎的变化会导致关键参数VCADRC和VCAmix之间存在差异。因此，在VCAmix表达式中引入了体积法，使用VTM法压实的圆柱形试件的体积来计算它。此外，建议将VCAmix ＜ 0.95VCADRC（n = 25）作为SMA混合料级配设计的骨架结构判别标准。与以VCAmix ＜ VCADRC（n = 25）作为骨架结构判别标准设计的SMA混合料相比，该标准表现出更突出的高温性能（抗剪强度高8%，动稳定度大15%）。
