Abstract
Diatomite has a promising application prospect as a commonly used modifier in asphalt, with low production costs and no pollution. In this study, frequency sweep tests and multiple stress creep recovery tests were carried out to analyze the viscoelastic properties of diatomite-modified asphalt. The time sweep tests and linear amplitude sweep tests were performed to investigate the fatigue properties of asphalt based on the viscoelastic continuous damage theory and dissipative energy theory. Subsequently, the correlation between viscoelastic properties and fatigue properties was revealed by the Pearson correlation coefficient. The results show that adding diatomite has an adverse effect on fatigue performance of asphalt, which is mainly attributed to the increase in the heat dissipation energy generated by adding diatomite during the dynamic loading cycle. In addition, the addition of diatomite can improve the elastic recovery ability of asphalt and reduce the unrecoverable creep compliance of asphalt. The correlation between the fatigue life and the irrecoverable deformation rate of diatomite modified asphalt is greater than 0.88. This work can be used as a reference not only for the application of diatomite in pavement engineering but also for the investigation of the viscoelastic and fatigue characteristics of other inorganic powder modified asphalt.
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