Study on Relaxation Damage Properties of High Viscosity Asphalt Sand under Uniaxial Compression

Abstract

Laboratory investigations of relaxation damage properties of high viscosity asphalt sand (HVAS) by uniaxial compression tests and modified generalized Maxwell model (GMM) to simulate viscoelastic characteristics coupling damage were carried out. A series of uniaxial compression relaxation tests were performed on HVAS specimens at different temperatures, loading rates, and constant levels of input strain. The results of the tests show that the peak point of relaxation modulus is highly influenced by the loading rate in the first half of an L-shaped curve, while the relaxation modulus is almost constant in the second half of the curve. It is suggested that for the HVAS relaxation tests, the temperature should be no less than −15°C. The GMM is used to determine the viscoelastic responses, the Weibull distribution function is used to characterize the damage of the HVAS and its evolution, and the modified GMM is a coupling of the two models. In this paper, the modified GMM is implemented through a secondary development with the USDFLD subroutine to analyze the relaxation damage process and improve the linear viscoelastic model in ABAQUS. Results show that the numerical method of coupling damage provides a better approximation of the test curve over almost the whole range. The results also show that the USDFLD subroutine can effectively predict the relaxation damage process of HVAS and can provide a theoretical support for crack control of asphalt pavements.

Low-Temperature Performance of Polymer-Modified Binders in Stone Mastic Asphalts

“…Other studies observed that the pavement stress dissipates slowly because of poor relaxation ability when its temperature is very low [53], confirming the current study's results. When this occurs, cracks in the pavement may appear since the final stress are more significant than the mixture's ultimate tensile strength.…”

“…The relaxation time is obtained when the tensile stress (resulting from applying the strain) is reduced to 36.8 ± 0.1% of its initial value. Relaxation modulus is a main viscoelastic parameter of an asphalt mixture and is an essential basis for evaluating and analyzing the performance and for predicting long-term pavement stability [53]. The evolution of stress versus time measured in the relaxation tests for the PMB25 mixture at three test temperatures (5, −10, and −20 • C) is shown in Figure 10.…”

Effects of Surfactant Warm‐Mix Additives on the Rheological Properties of High‐Viscosity Asphalt

“…Porous asphalt pavement has various advantages such as a high void ratio, large frictional resistance attributed to the rough surface, skid and rutting resistance, and sound absorption and noise reduction [1,2]. erefore, it can reduce the thickness of water film on the pavement, water spray, and noise in wet weather, thus improving the skid resistance and enhancing driver safety [3][4][5].…”

Research of Method for Solving Relaxation Modulus Based on Three-Point Bending Creep Test

“…The relaxation modulus could be directly obtained from relaxation test [8,9,10]. However, constant strain should be applied to the specimen instantaneously and remains unchanged during the relaxation test, which poses a great challenge to instrument selection, test design and operation [11].…”