Evaluation of the effects of adding nanoclay to terminal blend rubberised asphalt. 1000

Articles in Press

Document Type : Original Article

Authors

1 Civil Engineering Department, Payame Noor University, Tehran, Iran

2 Civil and Environmental Engineering Department, Amirkabir University of Technology, Tehran, Iran

3 civil engineering department, semnan university, semnan, iran

Abstract

Although one of the successful modifications for pavement asphalts was the blending of asphalt and the recycled crumb rubber using conventional wet process, problems with asphalt rubber such as phase separation and weakness in workability, which led to the introduction of the terminal blend process (TB) for the proper blending of asphalt and rubber. Rubber particles are completely digested in an asphalt binder due to the terminal blending process, which could cause a reduction in viscosity and a weakness at high temperature for TB rubberized asphalt compared to conventional asphalt rubber. In order to reduce the problems of TB rubberized asphalt, it is necessary to modify it. The main aim of this paper is to modify the TB rubberised asphalt by adding 2% and 4% of the nanoclay. First, after preparation of seven asphalt samples, the prepared nanocomposite structure was analysed using XRD and SEM tests. Then, the TB rubberised asphalt nanocomposite ageing, rheological, and physical specifications were investigated. The results showed that modification of TB rubberised asphalt by nanoclay reduced the temperature susceptibility and phase separation of it. On the other hand, it has been shown, compared to TB rubberised asphalt, TB rubberised asphalt nanocomposite has a high viscosity, softening point, and ageing resistance and also improved performance high temperatures.

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Journal of Transportation Research

Articles in Press, Accepted Manuscript
Available Online from 14 June 2020

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