A series of material parameters and production process parameters need to be determined in the design of hot in-plant recycled asphalt mixture, so as to make the pavement performance of recycled asphalt mixture meet the specification requirements. The rational determination of the aggregate gradation of the recycled mixture and the performance of the recycling agent, as critical parameters of the recycling design, has an important impact on the pavement performance of the recycled asphalt mixture. In this study, reclaimed asphalt pavement (RAP) from a seriously damaged pavement in Dalian, China was collected for recycling. Four recycling approaches with two different gradations and two different methods of recycling agent addition were designed, and the best recycling scheme was determined by a range of pavement performance tests. The results show that for the same method of adding recycling agent, the recycled asphalt mixture with the gradation close to the mid-value had better pavement performance, especially moisture damage resistance. Also, the two methods of adding recycling agent with different mechanisms exhibited basically the same performance of the recycled asphalt mixtures.
Asphalt ages gradually in the process of road construction and service due to the action of heat, oxygen, ultraviolet, moisture and other natural environmental factors. As a sustainable technology, the recycling of the aged reclaimed asphalt pavement (RAP) can bring significant environmental and economic benefits. During the recycling of RAP, the regeneration of aged asphalt is the key to guaranteeing the performance of recycled RAP. Based on a heavily damaged asphalt pavement in Dalian, China, this study evaluated the performance of the aged asphalt extracted and recovered from the RAP of this pavement, and several performance tests were performed on the obtained aged asphalt. By analyzing of its aging mechanism, three regenerating methods were adopted, and the performance of the three recycled asphalts was tested and compared. In such a manner, the regeneration effects of the three methods were objectively evaluated and the optimal regeneration approach was rationally determined.
Reclaimed asphalt pavement (RAP) has been increasingly recycled and applied to asphalt pavement engineering over the past decades. However, aged asphalt binder in RAP may lead to poorer low-temperature performance of the recycled asphalt concrete. To effectively and accurately evaluate the low-temperature performance of recycled asphalt binders, this paper investigates the low-temperature rheological properties of aged binder, virgin binder and recycled binder through the bending beam rheometer (BBR) test. By means of the MATLAB software, the Burgers model and Christensen- Anderson-Sharrock (CAS) model were used to fit to the BBR test data of the three binders at different test temperatures. The results showed that the recycled binder possessed superior low-temperature performance. Both the Burgers and CAS models performed well in fitting the measured creep stiffness data and thus can be well used in analyzing the BBR test data.
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