Impact of Fine Mineral Fraction Properties on the Fatigue Performance of Asphalt Mastic

2021 ◽  
pp. 315-322
Author(s):  
Michael Steineder ◽  
Bernhard Hofko ◽  
Lukas Eberhardsteiner
Keyword(s):  
Fatigue Performance ◽  
Asphalt Mastic ◽  
Mineral Fraction

scholarly journals Effect of Weather Aging on Viscoelasticity and Fatigue Performance of Asphalt Mastic

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6163
Author(s):  
Gang Xu ◽  
Yixin Zhou ◽  
Yu Zhu ◽  
Rui Wang ◽  
Xianhua Chen
Keyword(s):  
Fatigue Life ◽  
High Strain ◽  
Asphalt Mixture ◽  
Strain Level ◽  
Fatigue Performance ◽  
Modified Asphalt ◽  
Asphalt Mastic ◽  
Sbs Modified Asphalt ◽  
The Impact

The long-term effect of climate factors, such as sunlight, oxygen, and water, leads to the performance degradation of the asphalt mastic, which is the binding part in the asphalt mixture. It is not conducive to satisfy the long-term performance requirements of long-life asphalt pavement. In this study, five kinds of base asphalt mastic and styrene-butadiene-styrene (SBS) modified asphalt mastic were prepared with the filler-asphalt ratio of 0.6, 0.8, 1.0, 1.2, and 1.4. The indoor simulated weather aging tests were carried out considering multi-factors including sunlight, oxygen, and water. The master curves of the complex shear modulus and phase angle of the asphalt mastic with different aging degrees were obtained by the frequency sweep test. The curves of fatigue damage characteristics and fatigue life were fitted based on the viscoelastic continuum damage (VECD) model. The influence of weather aging on the viscoelasticity and fatigue performance of asphalt mastic were analyzed. Results indicated that the effect of weather aging increases the elastic component and decreases the viscous component. The fatigue performance of SBS modified asphalt mastic was better than that of base asphalt mastic. As the aging degree deepens, the brittle failure characteristics of asphalt mastic with a higher filler–asphalt ratio were more obvious. The base asphalt mastic becomes more sensitive to the strain level due to weather aging, and its fatigue life increased under the low strain loading and decreased under the high strain loading. The fatigue performance of SBS modified asphalt mastic was less sensitive to the strain level. The fatigue life reduced after aging under low and high strain load. Taking the impact of weather aging on the fatigue performance into consideration, the optimal filler–asphalt ratios of the base asphalt mastic SBS modified asphalt mastic are 1.0 and 1.2, respectively.

Crack Pinning in Asphalt Mastic and Concrete: Regular Fatigue Studies

2000 ◽  
Vol 1728 (1) ◽  
pp. 75-81 ◽  
Author(s):  
Benjamin J. Smith ◽  
Simon A. M. Hesp
Keyword(s):  
Particle Size ◽  
Fatigue Life ◽  
Asphalt Concrete ◽  
Filler Particle ◽  
Fatigue Tests ◽  
Fatigue Performance ◽  
Direct Result ◽  
Asphalt Mastic ◽  
Crack Pinning ◽  
Ground Limestone

The effects of finely dispersed fillers on the fatigue performance of asphalt binders and asphalt concrete mixes at relatively low temperatures are examined. A series of model binder systems containing glass spheres with narrow particle size distributions were used to study the effect of filler particle size on the fatigue performance of the asphalt mastic. Two mastic systems containing ground limestone fillers, which possessed significantly different gradations, also were tested. Fatigue performance was evaluated by applying a constant torsional strain to each specimen in a dynamic rheometer at 10°C and 40 Hz. Testing at various strain levels allowed the relationship between fatigue life and strain to be determined for the different systems. The results indicate that as the particle size of the filler decreases, the fatigue life of the asphalt mastic increases. This observation is a direct result of the mode of fatigue failure in the asphalt mastics and is in agreement with Evans’s theory on crack pinning for failure in filled brittle solids. Constant stress asphalt concrete fatigue tests on both dense- and gap-graded systems prepared with the two different ground limestone fillers show that the particle size does not significantly affect the fatigue life of the mixes. These results also confirm that crack pinning is the major mechanism responsible for improved fatigue performance.

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