An empirical model for modified bituminous binder master curves
An empirical model for modified bituminous binder master curves
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DOI：
10.1617/s11527-012-9988-x
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发表时间：
2013-09-01
影响因子：
3.8
通讯作者：
Partl, Manfred
中科院分区：
文献类型：
--
作者：
Asgharzadeh, Seyed Mohammad;Tabatabaee, Nader;Partl, Manfred
近几十年来，沥青结合料和混合料的力学行为建模一直是研究的热点。复模范数的主曲线|G级 *| 在线性粘弹性域中，相位角主曲线经常用于建模，而相位角主曲线很少用于此目的。因此，在本研究中，引入了一个经验模型的相位角主曲线的改性和纯沥青结合料。该模型基于双逻辑（DL）数学函数的一般形式。的|G级 *| 然后使用相位角和相位角之间的相互关系对主曲线进行建模，|G级 *|.生成了三种纯粘合剂和七种改性粘合剂的主曲线，并用于验证DL模型。结果表明，该模型能够正确预测相位主曲线的平台区。特别是，主曲线在高频率下的渐近行为可以被正确地建模。该模型还描述了相位角主曲线在高温范围内的不规则性。一般来说，模型输出，如相位角值在平台，玻璃态模量，流变指数和交叉频率正确预测的行为的净和改性的粘合剂。
Modeling the mechanical behavior of asphalt binders and mixtures has been the subject of intensified research in recent decades. Master curves of the norm of the complex modulus |G*| in the linear viscoelastic domain are frequently used for modeling, while phase angle master curves are less frequently considered for this purpose. Therefore in this research, an empirical model is introduced for phase angle master curves of modified and neat bituminous binders. The model is based on a general form of a double-logistic (DL) mathematical function. The |G*| master curve was then modeled using a mutual relationship between the phase angle and |G*|. Master curves of three neat and seven modified binders were generated and used to validate the DL model. The results showed that the model is capable of properly predicting the plateau region of phase angle master curves. In particular, the asymptotic behavior of the master curves at high frequencies can be modeled correctly. The model also describes irregularities in the high temperature range of the phase angle master curve. In general, model outputs such as the phase angle value at the plateau, glassy modulus, rheological index and crossover frequency correctly predict the behavior of the neat and modified binders.