Assessing Active Asphalt Content and Rutting Potential of Reclaimed Asphalt Concrete

• Main Authors: Yung-Chih Chang, 張詠智
• Other Authors: Min-Chih Liao
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/vfxq8b

碩士 === 國立臺灣科技大學 === 營建工程系 === 106 === To help address the built environmental issues of asphalt recycling and pavement sustainability, strategies that make asphalt pavements recyclable and renewable have been investigated through laboratory measurements. In this study, the effects of asphalt rheology and reclaimed asphalt pavement (RAP) content on the engineering properties and permanent deformation of the recycled asphalt concrete (RAC) were investigated. In addition, a new method was developed to obtain the active asphalt binder content within the aged asphalt based on the TRL (Transportation Research Laboratory) best practice guide for recycling. The frequency sweeps testing using a dynamic shear rheometer was also conducted on the recycled asphalt binders to evaluate the rutting potential of the RAC. Test results showed that the RAC incorporating 40% RAP possessed the higher active asphalt binder content in terms of the Marshall stability. For the rutting performance of the RAC, air void content as well as the aggregate gradation played important roles on the densification and creep stages. The rheological behavior of the asphalt binder considerably affected the tertiary stage during the testing. It was also found that the aggregate gradation tended to be finer when the RAP content was added up to 70%, leading to the worst rutting performance of the RACs. In addition, the photogrammetry technique could be employed to measure the deformation depth and clearly interpret the distress modes of the RAC specimens during the wheel track testing.