Characterizing the Relaxation Modulus properties of HMA mixes based on the uniaxial strain-controlled testing

Relaxation Modulus (RM) is one of the mechanical properties that can be utilized to model the visco-elastic behavior of Hot-Mix Asphalt (HMA) for various purposes including material response analysis, design, and performance prediction. In this study, the uniaxial static strain-controlled RM tests conducted at three temperatures of 10, 20, and 30 C were used to characterize the time-dependent elastic relaxation modulus (E(t)) and stress relaxation rate (m) of various commonly used Texas HMA mixes. The effects of various mix-design parameters including asphalt-binder type, content, and modifier; aggregate type; and oxidative aging on both the Eft) and m parameters were also investigated and are discussed in this paper. A total of thirteen different HMA mixes were tested. Test data variability and consistency are also discussed including some suggestions for the RM test protocol improvements. 2010 Lavoisier, Paris.

Characterizing the Relaxation Modulus properties of HMA mixes based on the uniaxial strain-controlled testing Academic Article