• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Transportation Research Record >Aggregate Orientation and Segregation in Laboratory-Compacted Asphalt Samples
【24h】

Aggregate Orientation and Segregation in Laboratory-Compacted Asphalt Samples

机译：实验室压实沥青样品中的骨料取向和偏析

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Different laboratory compaction methods can produce volumetrically identical asphalt mixture specimens but with widely varying mechanical properties. Provided that the mixture design is constant, variations in mechanical properties are probably due to differences in the structure of the aggregate-bitumen matrix. The objective of this study is to investigate the structure of the internal aggregate—bitumen matrix created by different laboratory compaction methods and compare it with mechanical performance. Three types of laboratory compaction are considered: gyratory, vibratory, and slab. Image analysis techniques have been used to provide quantitative information on the orientation and distribution of aggregates on horizontal planes within asphalt mixture specimens, and the results indicate that circumferential alignment of aggregate particles occurs in gyratory and vibratory compacted specimens. This behavior is more pronounced for larger aggregate particles and in those with an aspect ratio (maximum length/maximum width) greater than two. Slab- compacted specimens display a more random particle orientation. The distribution and segregation of aggregates has been considered relative to the center of each horizontal asphalt-specimen cross section. While overall levels of aggregate particle density are similar across all compaction methods considered, greater segregation occurs in vibratory- and gyratory-compacted specimens. Repeated load axial testing was done on specimens compacted by each method. The results indicate higher resistance to deformation in the vibratory- and gyratory-compacted samples than in volumetrically identical slab-compacted samples.
机译：不同的实验室压实方法可以生产体积相同的沥青混合料试样，但机械性能差异很大。如果混合物设计是恒定的，则机械性能的变化可能是由于骨料-沥青基质结构的差异所致。这项研究的目的是研究内部集料的结构-通过不同的实验室压实方法产生的沥青基质，并将其与机械性能进行比较。考虑了三种类型的实验室压实：回旋式，振动式和平板式。图像分析技术已被用于提供有关沥青混合料样品内水平面上骨料的取向和分布的定量信息，结果表明，在旋转和振动压实样品中骨料颗粒发生了圆周排列。对于较大的聚集体颗粒和长径比（最大长度/最大宽度）大于2的聚集体，此行为更为明显。平板压实的样品显示出更随机的颗粒方向。相对于每个水平沥青试样横截面的中心，已经考虑了骨料的分布和偏析。尽管在所有考虑的压实方法中，总颗粒密度的总体水平都相似，但在振动和旋转压实的样品中发生了更大的分离。对通过每种方法压实的样品进行了重复的载荷轴向测试。结果表明，与体积相同的平板压缩样品相比，振动和旋转压缩样品中的抗变形性更高。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号