个人信息Personal Information
副教授
硕士生导师
性别:男
毕业院校:大连理工大学
学位:博士
所在单位:交通运输系
学科:道路与铁道工程. 市政工程
办公地点:综合实验4号楼520室
电子邮箱:sunyiren@dlut.edu.cn
A unified procedure for rapidly determining asphalt concrete discrete relaxation and retardation spectra
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论文类型:期刊论文
发表时间:2015-09-15
发表刊物:CONSTRUCTION AND BUILDING MATERIALS
收录刊物:SCIE、EI、Scopus
卷号:93
页面范围:35-48
ISSN号:0950-0618
关键字:Asphalt concrete; Complex modulus; Relaxation spectrum; Retardation spectrum; Prony series; Havriliak-Negami model
摘要:This paper presents a unified procedure that can rapidly determine the discrete relaxation and retardation spectra of asphalt concrete. The new procedure involves three consecutive steps: (1) pre-smoothing the complex modulus data with the Havriliak-Negami (HN) model, (2) identifying the discrete relaxation spectrum from the smoothed data with a modified windowing method (MWM) and (3) converting the obtained spectrum into the corresponding discrete retardation spectrum. The HN model adopted furnishes reasonable analytical representations for all the complex modulus components and allows an asymmetrical inflection point for the dynamic modulus and storage modulus master curves on the log-log scale, effectively overcoming the drawbacks of the conventional sigmoidal function in characterizing the asphalt concrete linear viscoelastic (LVE) behavior. Also, the HN model can well predict the phase angle from the dynamic modulus data, substantially extending the application of the old data lacking the phase angle information in the LVE analysis. Additionally, the MWM offers a more appropriate estimation approach for the glassy modulus, successfully avoiding the undesirable spectrum oscillations and negative spectrum lines. A distribution of the time constants with 0.5 decade intervals was implemented in this procedure, completely excluding the waviness in the bell-shaped master curves of the generalized Maxwell (GM) and generalized Voigt (GV) models. Very few parameters are required for the initial inputs in the procedure and no empirical adjustments or selections are required for the GM or GV model constants during the whole computation process. The convergence of the iterations for determining the discrete spectra proved to be very fast. (C) 2015 Elsevier Ltd. All rights reserved.