Rational modeling of tertiary flow for asphalt mixtures
Rational modeling of tertiary flow for asphalt mixtures
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DOI：
10.3141/2001-08
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发表时间：
2007-01-01
影响因子：
1.7
通讯作者：
Witczak, Matthew W.
中科院分区：
文献类型：
--
作者：
Biligiri, Krishna P.;Kaloush, Kamil E.;Witczak, Matthew W.
本研究的目的是评估几种数学模型，用于计算沥青混合料的三次流的开始[称为流数（FN）参数]。FN是沥青混合料剪切变形的起始点，是评价车辙的重要参数。FN是通过重复载荷永久变形（RLPD）实验室测试获得的。目前的建模技术，在确定FN使用多项式模型拟合的方法，这对于大多数传统的沥青混合料。然而，对橡胶改性沥青混合料使用该多项式模型的分析和观察表明，在识别真实FN值方面存在问题。工作范围包括收集和分析300多个RLPD测试数据文件，其中包括40多种混合物，广泛的测试温度和几个应力水平。推荐了一种新的综合数学模型，以准确地确定FN。通过人工计算对结果和分析进行了评价，发现结果和分析准确、合理，适用于所有混合物类型，无论是否达到第三阶段。
The objective of this research study was to evaluate several mathematical models to be used in calculating the onset of tertiary flow [referred to as the flow number (FN) parameter] for asphalt mixtures. The FN indicates the onset of shear deformation in asphalt mixtures, which is a significant parameter in evaluating rutting in the field. The FN is obtained from the repeated load permanent deformation (RLPD) laboratory test. Current modeling techniques in determining the FN use a polynomial model fitting approach, which works well for most conventional asphalt mixtures. However, analysis and observations on the use of this polynomial model for rubber-modified asphalt mixtures showed problems in identifying the true FN values. The scope of the work included the collection and analysis of more than 300 RLPD test data files, which comprised more than 40 mixtures, a wide range of test temperatures, and several stress levels. A new comprehensive mathematical model was recommended to accurately determine the FN. The results and analysis were evaluated through manual calculations and found to be accurate, rational, and applicable to all mixture types, whether a tertiary stage was reached or not.