Investigating the Effect of  Softening Agent on the Performance Characterization of Asphalt Concrete Mixture with High RAP Content

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Majidifard, Hamed | 2016

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 48534 (09)
University: Sharif University of Technology
Department: Civil Engineering
Advisor(s): Tabatatabee, Nader
Abstract:
Recycling of asphalt pavements has received much attention in recent years for its environmental and economical benefits. Because of increase in costs of raw materials and energy carriers, reuse of a high portion of reclaimed asphalt pavements (RAP) eliminates an enormous amount of waste and reduces the cost of hot-mix asphalt (HMA) mixtures. There are some problems in high-RAP mixtures such as high content of fine aggregate and filler, low temperature cracking potential because of higher stiffness of RAP binder, and low mixture workability. In this research, RAP fractionation was used to sort out and eliminate fine aggregate and filler. An organic-based softening agent was used to improve workability and decrease stiffness of RAP binder. According to the results as the content of softening agent in high-RAP mixtures increased, workability improved and better performance in low temperature cracking was obtained while fatigue cracking and moisture damage resistance decreased. Therefore, a procedure to obtain the optimum content of softening agent was devised to strike the balance between performance characteristics of mixtures with high-RAP content
Keywords:
Recycling ; Reclaimed Asphalt Pavement (RAP) ; Cracking ; Fatigue ; Asphalt Concrete ; Softening

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