Rheological Evaluation of Polymer Bitumen Containing Nano-Clay in a temperature continuous range affected by pre-mixing

Document Type : Research Paper

Author

Assistant Professor, Department of Civil Engineering, Payame Noor University, Department of Center of North Tehran

Abstract

Improving bitumen with additives such as nanomaterials will be difficult in adding the materials and mixing them occasionally both in laboratory and real scale. Therefore, in this research, we tried to improve the performance of the samples by making changes in the way of preparing the samples, while simplifying production process conditions. The hypothesis of this research is based on the principle that this method firstly helps prepare the Nano-clay and increase the distance between the plates, and secondly, reduces the steps and the time duration of adding different materials to bitumen. Also, it improves the rheological properties and the way in which the materials are dispersed in bitumen. In this research, 12 samples were considered that have been prepared by pre-mixing and conventional mixing methods, and the differences in their properties were investigated under different process conditions. Using classical experiments (degree of penetration, softness and ductility point) and performance based tests such as PG and temperature sweep, tested and compared the properties of the samples improved in different methods. The results showed that the use of premixing method compared to the conventional method has a greater effect on improvement of the properties of bitumen and achievement on the similar properties with the conventional method but in less mixing speed. The reduction of mixing speed, while affecting the improvement of bitumen aging, demonstrated the superiority of using the premixing method. In general, changing the method of bitumen improvement showed its effect on reducing aging caused by the mixing process and on preparing a more homogeneous mixture having more suitable function. It should be noted that the samples made by the premixing method showed a higher "behavior change temperature" (T75 °) than the conventional method.

Keywords

References

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History

  • Receive Date: 06 March 2019
  • Revise Date: 30 August 2019
  • Accept Date: 19 November 2019

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