The Discrete and Continuous Retardation and Relaxation Spectrum Method for Viscoelastic Characterization of Warm Mix Crumb Rubber-Modified Asphalt Mixtures

Materials

Chao Li¹  Lan Wang¹  Yongming Xing²  Fei Zhang² 

[1] School of Civil Engineering, Inner Mongolia University of Technology, Hohhot 010040, China;School of Science, Inner Mongolia University of Technology, Hohhot 010040, China;

关键词: master curve;    discrete spectrum;    continuous spectrum;    relaxation modulus;    creep compliance;    warm mixing crumb rubber-modified asphalt mixture;   

DOI  :  10.3390/ma13173723

来源: DOAJ

【 摘 要 】

To study the linear viscoelastic (LVE) of crumb rubber-modified asphalt mixtures before and after the warm mix additive was added methods of obtaining the discrete and continuous spectrum are presented. Besides, the relaxation modulus and creep compliance are constructed from the discrete and continuous spectrum, respectively. The discrete spectrum of asphalt mixtures can be obtained from dynamic modulus test results according to the generalized Maxwell model (GMM) and the generalized Kelvin model (GKM). Similarly, the continuous spectrum of asphalt mixtures can be obtained from the dynamic modulus test data via the inverse integral transformation. In this paper, the test procedure for all specimens was ensured to be completed in the LVE range. The results show that the discrete spectrum and the continuous spectrum have similar shapes, but the magnitude and position of the spectrum peaks is different. The continuous spectrum can be considered as the limiting case of the discrete spectrum. The relaxation modulus and creep compliance constructed by the discrete and continuous spectrum are almost indistinguishable in the reduced time range of 10⁻⁵ s–10³ s. However, there are more significant errors outside the time range, and the maximum error is up to 55%.

【 授权许可】

Unknown