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Investigating the Long-term Frictional Properties and Establishing Aggregate Polishness Guidelines for Asphalt Surface Mixtures in Tennessee
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2025-04-30
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[PDF-5.94 MB]
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Abstract:The frictional properties of aggregates play a significant role in determining pavement skid resistance. To preserve natural aggregates, reclaimed asphalt pavement (RAP) has been widely used for decades. However, its application in pavement surface courses is restricted due to uncertainties about its frictional properties and other mechanical performance. Therefore, this research aimed to quantitatively a assess both aggregates and RAP to develop a quick evaluation method for frictional properties. Additionally, long-term frictional properties of asphalt mixtures commonly used in Tennessee were investigated to establish correlation with different testing devices. Three-wheel polishing device (TWPD) was employed to simulate the long-term traffic polishing in laboratory. Dynamic friction tester (DFT) and Circular track meter (CTM) were utilized for both laboratory and field skid resistance measurement tests. The locked-wheel skid trailer (LWST) was also employed to compare results with those from the DFT. DFT proves to be a practical tool for friction assessment with both laboratory and field applications, which can be used for the development of friction performance–based mixture designs. Results indicate a significant correlation between SiO2 content and frictional properties of aggregates. Furthermore, the relationship is identified between the percentage of polish-resistant aggregates and the decrease in the coefficient of friction (COF) in asphalt mixtures.
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