孙依人

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

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Novel Procedure for Accurately Characterizing Nonlinear Viscoelastic and Irrecoverable Behaviors of Asphalt Binders

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论文类型:期刊论文

发表时间:2020-03-01

发表刊物:INTERNATIONAL JOURNAL OF GEOMECHANICS

收录刊物:EI、SCIE

卷号:20

期号:3

ISSN号:1532-3641

关键字:Dynamic shear rheometer (DSR); Nonlinear behavior; Permanent deformation; Schapery's model; Multiple stress creep recovery (MSCR)

摘要:The multiple stress creep recovery (MSCR) test has been extensively recognized as a more effective method for characterizing the rutting resistance of asphalt binders than the traditional linear viscoelastic (LVE) theory-based Superpave performance grading (PG) test that determines the rutting parameter. However, recent studies have shown that the MSCR test has a major limitation in that the 9-s recovery period in each cycle may not allow complete recovery of the delayed elasticity, particularly for modified binders, which implies that the definitions of the parameters from the MSCR test, e.g., the nonrecoverable compliance Jnr, are not the strictest ones. To accurately separate and obtain the actual irrecoverable and recoverable responses of binders from the MSCR test, this study developed a new procedure that uses the full Schapery nonlinear viscoelastic (NLVE) model and the LVE properties from the frequency sweep test. The results showed that the presented approach overcomes the deficiencies of existing methods, and can accurately and effectively characterize the NLVE and irrecoverable behaviors of the binders, regardless of whether they were polymer-modified or neat, and can guarantee the consistency of the material information from the traditional PG test and the MSCR test. Because of these advantages, the procedure provides a potential approach for further analyzing and modeling the rutting behavior of the corresponding asphalt concrete.