Performance Evaluation of Recycled Hot Mixed Asphalt Mixture with Reclaimed Aggregate Ratio

Jinho, Jeon，; Hwang, Sung Do; Mun, Sungho

doi:10.7855/ijhe.2019.21.3.009

Cited by 1 publication

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“…A much large amount of recycled asphalt material was produced in China during the recent past reaching the value of 160 million tons of RAP annually [ 18 ]. In the case of Europe and South Korea, approximately 47 and 21 million tons of RAP are annually produced and recycled for asphalt pavement construction, respectively [ 18 , 19 , 20 ]. In South Korea, especially, several large-scale asphalt overlay projects are planned; this is because an increasing portion of the road network that was built during the 1980s and 1990s is experiencing severe aging conditions (this includes not only asphalt, but also concrete pavement) [ 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Double-Recycled Reclaimed Asphalt Pavement: A Laboratory Investigation at Low Temperatures Based on Different Mathematical Approaches

Moon¹,

Falchetto

2020

Materials

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Using recyclable materials in asphalt pavement is a fundamental design approach not only for limiting the environmental impact of the construction industry, but also for reducing the overall costs of the road infrastructures. Over the past years, road agencies have developed different policies to incorporate various types of recyclable material into conventional asphalt mixtures. reclaimed asphalt pavement (RAP) is one of the most highly recycled construction materials. However, the aged RAP binder and its stiffer and brittle characteristics compared to the fresh binder may negatively affect the performance of the recycled mixture, especially when operating in cold climates. In this study, the low-temperature response of asphalt mixture prepared with single-recycled RAP (SRRAP) and double-recycled RAP (DRRAP), prepared in the laboratory, is experimentally investigated based on creep testing performed with the bending beam rheometer (BBR). Then, the data were analyzed based on three simple mathematical models to extract information on material behavior. Finally, a new indicator named thermal stress factor (TFS) on low-temperature response is proposed. Relatively poorer performance was observed from SRRAP mixture compared to the asphalt mixture prepared with virgin material. However, the low-temperature response between SRRAP and DRRAP did not present significant differences. The values of TFS support the experimental results and suggest the possibility of considering re-recycling technology for further research with the objective of a possible application in the asphalt pavement industry.

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