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Evaluation of methods for measuring aggregate specific gravity.

机译:评价测量骨料比重的方法。

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摘要

The current American Association of State Highway and Transportation Officials (AASHTO) procedures for determining the aggregate specific gravities and absorption values are time consuming and hence are not appropriate for quality control processes. These methods are not repeatable too which is another issue with the standard test methods. The standard AASHTO method for fine aggregates has problems with angular and absorptive materials. Due to this problem several agencies have developed alternative methods. Correct measurement of the specific gravity and absorption play a crucial role in the design of hot mix asphalt (HMA) mixtures. Improper measurements can lead to poor asphalt being accepted for a certain job and on the other hand good quality asphalt may be rejected. The pavement life is at great risk if poor quality asphalt is accepted. And there can be a lot of cost concerns if good quality asphalt is being rejected.;This research evaluated the specific gravity test methods for fine aggregates. The focus of the research is to find a test method that is suitable for all types of fine aggregates. There were 9 different methods used to determine the fine aggregate specific gravities apart from the standard AASHTO method. All the selected methods are the modifications made by other agencies in order to improve the test accuracy. The comparison between the different methods to the AASHTO method was done using the student t distribution test.
机译:当前的美国国家公路和运输官员协会(AASHTO)确定总比重和吸收值的程序很耗时,因此不适用于质量控制过程。这些方法也不可重复,这是标准测试方法的另一个问题。用于细骨料的标准AASHTO方法存在棱角和吸收性材料的问题。由于这个问题,一些机构已经开发出替代方法。正确测量比重和吸收率在热混合沥青(HMA)混合物的设计中起着至关重要的作用。测量不当会导致不良沥青被接受用于某些工作,另一方面,优质沥青可能会被拒绝。如果接受劣质沥青,则路面寿命将面临极大风险。如果拒绝优质沥青,则可能存在很多成本问题。;本研究评估了细骨料的比重试验方法。研究的重点是找到一种适用于所有类型的细骨料的测试方法。除标准AASHTO方法外,还有9种不同的方法可用于确定细骨料的比重。所有选择的方法都是其他机构进行的修改,以提高测试准确性。使用学生t分布检验对不同方法与AASHTO方法进行了比较。

著录项

  • 作者

    Bikya, Rajasekhar.;

  • 作者单位

    West Virginia University.;

  • 授予单位 West Virginia University.;
  • 学科 Engineering Civil.
  • 学位 M.S.
  • 年度 2012
  • 页码 133 p.
  • 总页数 133
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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