Determining Optimum Number of Gyrations for Porous Asphalt Mixtures Using Superpave Gyratory Compactor
Determining Optimum Number of Gyrations for Porous Asphalt Mixtures Using Superpave Gyratory Compactor
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DOI：
10.1007/s12205-021-1005-x
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发表时间：
2021-03-26
影响因子：
2.2
通讯作者：
Li, Ning
中科院分区：
文献类型：
--
作者：
Wang, Xiaowei;Ren, Jiaxing;Li, Ning
多孔沥青混合料的压实特性与传统的密实级配沥青混合料有很大的不同。压实工作对于PA混合物在强度、功能性和耐久性方面表现出良好性能至关重要。本研究的目的是确定使用Superpave旋转压实机压实的典型PA混合物的最佳旋转次数。通过室内试验研究了PA混合料的压实特性以及7个回转度对空隙率（AV）、马歇尔稳定度（MS）、多向渗透性、石-石接触、耐久性等指标的影响。设计了一个多方向渗透仪来评价PA混合物的多方向渗透性，包括垂直渗透性、水平渗透性和水平-垂直组合渗透性。AV含量、多方向渗透率随回旋度的增大而减小。根据每个指标的要求，确定了每个指标的最小和最大回转。平衡强度、功能性和耐久性的性能，PA混合物的最佳回转次数被确定为在45和75个回转之间，这允许根据PA混合物的应用进行不同的回转。最后提出了提高PA混合料性能的MS、水平渗透率和水平-垂直联合渗透率要求。
The compaction characteristics of porous asphalt (PA) mixtures are significantly different from those of traditional dense-graded asphalt mixtures. Compaction efforts are critical for PA mixtures to exhibit good performance in terms of strength, functionality, and durability. The objective of this study was to determine the optimum number of gyrations for typical PA mixtures compacted using a Superpave gyratory compactor. The compaction characteristics and the influence of seven gyration levels on the indicators of air voids (AV) content, Marshall Stability (MS), multi-directional permeability, stone-on-stone contact, and durability of PA mixture were investigated through laboratory experiments. A multi-directional permeameter was designed to evaluate the multi-directional permeability of PA mixtures, including vertical, horizontal, and combined horizontal-vertical permeability. The AV content, multi-directional permeability decreases with the increasing gyrations. Based on the requirements of each indicator, the minimum and maximum gyrations for each indicator were determined. Balancing the performance of strength, functionality, and durability, the optimum number of gyrations for the PA mixtures was determined to be between 45 and 75 gyrations, which allows for different gyrations depending on the application of the PA mixture. Finally, the requirements of MS, horizontal permeability, and combined horizontal-vertical permeability are recommended for improving the performance of PA mixture.