Title: Effects of Aging on Long-Term Performance of Reclaimed Asphalt Pavement (Rap) Containing Warm Mix Asphalt (Wma) Additive
Abstract: Nowadays, durability and sustainability are the primary needs of flexible pavement. The durability element may affect the long-term performance parameters of pavements in various ways, including fracture properties, aging, rutting, moisture, and freeze-thaw damages. However, the sustainability factor may implicate the application of Recycled Asphalt Pavement (RAP) and Warm Mix Additive (WMA) in the asphalt mixes. Several studies have been conducted on the performance of RAP and WMA mixes; nevertheless, a limited study is obtainable on comprehending the effects of aging on the long-term performance of Reclaimed Asphalt Pavement (RAP) containing Warm Mix Asphalt (WMA) additives. Thus, this paper aims to assess the effect of long-term aging on fracture properties of asphalt mixture containing RAP and WMA additive at 25 ˚C. To this end, various RAP contents (0, 50, 75, and 100%) and one WMA additive (Zycotherm) were used. Long-term aging was applied to asphalt samples at the oven for different aging times (0, 3, 5, 7, and 9 days at 85 ˚C). The Semicircular Bending (SCB) test was used to investigate the fracture characteristics of different mixture combinations. Afterward, various fracture parameters, including fracture force, fracture toughness, strain energy, J-integral, stiffness, and flexibility index, were determined to identify the impact of aging and RAP addition on different fracture properties. In this study, to remedy the problem concerning the amorphous trend of fracture characteristics over the service time and intersecting the curves of fracture parameters versus service life, the area beneath the fracture parameter was employed as a reliable index for comparing different mixture combinations. Then, summations of the area of all fracture parameters versus service time for asphalt mixture with additional RAP content were identified as the overall fracture resistance of each mixture. The results show that the area under the fracture properties versus the time-of-use curve can provide a reliable index for evaluating the long-term fracture properties of asphalt mixtures with different RAP contents. Finally, an analysis of variance (ANOVA) was determined to evaluate the statistically significant parameters of asphalt pavement performance. Overall, this research can help agencies make a more precise decision regarding the consequences of high RAP content on the long-term performance of asphalt pavements.
Publication Year: 2023
Publication Date: 2023-01-01
Language: en
Type: article
Indexed In: ['crossref']
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