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Workability of Hot-Mix Asphalt

机译：热拌沥青的可加工性

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摘要

The term "workability" has been used to describe several properties related to the construction of hot-mix asphalt (HMA). For this study, workability was defined as a property describing the ease with which HMA can be placed, worked by hand, and compacted. This definition provides a term that is applicable to movement of HMA through equipment to the roadway, handwork of HMA, and compatibility on the roadway. The primary objective of this study was to evaluate a prototype device to measure the workability of HMA mixes that could identify the change in workability due to changes in mix characteristics. The findings of this study led to successful design of a device to measure the workability of HMA mixes. The workability of HMA was affected by aggregate type, nominal maximum aggregate size, binder type, and temperature. Gradation shape did not have a significant effect on workability. However, numerous two- and three-way interactions that included gradation shape were significant. Mixes modified to meet a PG76-22 were significantly less workable than mixes containing an unmodified PG64-22. There was a relationship between workability and temperature that showed increased workability at higher temperatures.
机译：术语“可加工性”已用于描述与热混合沥青（HMA）的施工有关的几种性能。在本研究中，可加工性被定义为一种属性，它描述了可以轻松放置，手动处理和压实HMA的便利性。此定义提供了一个术语，适用于HMA通过设备到巷道的移动，HMA的手工以及巷道的兼容性。这项研究的主要目的是评估一种原型设备，以测量HMA混合物的可加工性，从而可以确定由于混合物特性变化而引起的可加工性变化。这项研究的结果导致成功设计了一种可测量HMA混合物可加工性的设备。 HMA的可加工性受骨料类型，标称最大骨料尺寸，粘结剂类型和温度的影响。渐变形状对可加工性没有显着影响。但是，包括渐变形状在内的大量双向交互和双向交互都很重要。经改性以符合PG76-22的混合物比包含未经改性的PG64-22的混合物的可加工性明显降低。可加工性与温度之间存在关系，表明在较高温度下可加工性增加。

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