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何兆益,官志桃,刘奕,等. 多孔沥青混合料旋转压实特性与动态模量[J]. 科学技术与工程, 2021, 21(19): 8204-8211.
He Zhaoyi,Guan Zhitao,Liu Yi,et al.Analysis on Gyratory Compaction Characteristics and Dynamic Modulus of Porous Asphalt Mixture[J].Science Technology and Engineering,2021,21(19):8204-8211.
多孔沥青混合料旋转压实特性与动态模量
Analysis on Gyratory Compaction Characteristics and Dynamic Modulus of Porous Asphalt Mixture
投稿时间:2020-12-24  修订日期:2021-04-21
DOI:
中文关键词:  多孔沥青混合料  ? 旋转压实  ? 空隙率  ? 动态模量  ? 主曲线
英文关键词:porous asphalt mixture  gyratory compaction  porosity  dynamic modulus  master curve
基金项目:交通部行业重点科技项目(2018-TG-003)
           
作者单位
何兆益 重庆交通大学土木工程学院
官志桃 重庆交通大学土木工程学院
刘奕 广西交通投资集团有限公司
王东敏 重庆市城投路桥管理有限公司
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中文摘要:
      针对目前国内关于多孔沥青混合料(Porous Asphalt Concrete, PAC)动态模量缺少研究压实特性对其影响这一问题,采用旋转压实方法(Superpave Gyratory Compactor, SGC)通过室内成型PAC-13(1)、PAC-13(2)和PAC-13(3)三种不同级配、设计空隙率的旋转压实试件,对PAC旋转压实均匀性进行分析,确定依据时间-温度等效原理运用最小二乘法拟合三种级配的多孔沥青混合料主曲线,计算得出位移因子以及模型参数。结果表明:松铺高度较高的试件对应空隙率较大,目标压实度可以通过控制旋转压实次数来达到;提出空隙分布均匀系数,其越趋近于0代表混合料空隙分布越均匀,可用于指导室内旋转压实成型试验;多孔沥青混合料动态模量的大小受到成型试件空隙率、加载频率及环境温度三者耦合作用的影响;多孔沥青混合料与Sigmoidal模型拟合度较好,提出任意空隙率在不同温度、频率下的动态模量计算公式,可为后续有限元结构设计提供材料参数。
英文摘要:
      In view of lacking research on the influence of compaction characteristics on the dynamic modulus of porous asphalt mixture (Porous Asphalt Concrete, PAC) in China, the gyratory compaction method (Superpave Gyratory Compactor, SGC) was used to form the rotating compaction specimens with three different gradations and designed porosity by indoor molding of PAC-13(1), PAC-13(2) and PAC-13(3). The uniformity of PAC rotating compaction was analyzed and the least square method was used to fit the main curve of porous asphalt mixture with three gradations according to the time-temperature equivalent principle. The displacement factor and model parameters were calculated. The results show that the specimen with higher loose paving height has larger void ratio, and the target compaction can be achieved by controlling the number of rotary compaction. The uniformity coefficient of void distribution is proposed, which is closer to 0, indicating that the void distribution of the mixture is more uniform, and it can be used to guide the indoor rotary compaction test. The dynamic modulus of porous asphalt mixture is affected by the coupling effect of porosity, loading frequency and ambient temperature of the molding specimen. The porous asphalt mixture has good fitting degree with the Sigmoidal model, and the dynamic modulus calculation formula of any void ratio at different temperatures and frequencies is proposed, which can provide material parameters for the subsequent finite element structural design.
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