A review of the performance of warm mix asphalts containing reclaimed asphalt pavements

Document Type : Review Article

Authors

1 دانشکده عمران، دانشگاه زنجان

2 Civil Engineering Department,, Zanjan University

10.22034/tri.2023.357985.3079

Abstract

The tendency to use reclaimed asphalt materials in warm mix asphalt technology has increased due to lower production cost, reduced environmental impact, improved performance and many other reasons. If reclaimed asphalt pavements (RAP) are used in warm mix asphalts (WMA), these two will act as complements to each other and an efficient method will be created to overcome the separate inherent limitations of warm mix asphalts and reclaimed asphalt pavements. The low production temperature reduces the secondary aging of the reclaimed asphalt mixtures during production, and the low viscosity of the warm mixture allows the use of a high percentage of reclaimed asphalt pavement without compromising the workability of the asphalt mixture. In this research, in addition to the comparative evaluation of various recycling technologies of recycled asphalt mixtures according to their manufacturing temperatures, the advantages, disadvantages, limitations and performance of warm mix asphalts containing reclaimed asphalt pavements in different moisture and cold conditions are investigated. The review of studies conducted on warm mixtures containing recycled asphalt pavements shows that laboratory and field studies should be focused on the fatigue performance at intermediate temperatures and cracking at low temperatures of these mixtures. Also, considering that the improvement of the rheological properties of these mixtures at medium and low temperatures using rejuvenators or other additives is effective on the properties of the mixture at high temperatures and their moisture susceptibility, and it requires simultaneous examination of the parameters is related to them, a brief picture of the future research horizons to solve the performance deficiencies of these mixtures is presented.

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