تاثير دانه بندي و درصد فضاي خالي مصالح سنگي (VMA) بر پتانسيل شيارشدگي و ارايه مدل پيش بيني پتانسيل شيارشدگي

Determination of the Effect of the Grading and Void in Mineral Aggregate (VMA) on Rutting Potential of Asphalt Mixtures and Development of Correlation Model to Predict the Rutting Potential Obtained from Dynamic Creep Test

Rutting has been recognized as the most detrimental distress among fatigue cracking, thermal cracking and rutting in flexible pavements. Hence, evaluating the causes of rutting, on one hand, and developing the prediction capability of either rut depth or rutting potential on the other is very important. In this paper, at first, asphalt samples are fabricated with various bitumen percentages, according to upper, middle and lower limits of grading no. 3, 4 and 5 mentioned at "Standard on Iran Roadsʹ Pavements Design". Then the Marshall Stability test and Dynamic Creep test are conducted on the samples. Besides the assessment of the influence of the aforementioned grading and void in mineral aggregate (VMA) on rutting potential, it is attempted to develop the correlation model among grading, VMA, and results of dynamic creep test (=Flow Number).