Structural Engineering and Mechanics

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Effect of silica fume on mechanical properties of concrete containing recycled asphalt pavement

  • Katkhuda, Hasan N. (Civil Engineering Department, The Hashemite University) ;
  • Shatarat, Nasim K. (Civil Engineering Department, The University of Jordan) ;
  • Hyari, Khaled H. (Civil Engineering Department, The Hashemite University)
  • Received : 2016.09.15
  • Accepted : 2017.02.17
  • Published : 2017.05.10
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Abstract

This paper presents the results of a study that investigated the improvement of the mechanical properties of coarse and fine recycled asphalt pavement (RAP) produced by adding silica fume (SF) with contents of 5%, 10%, and 15% by total weight of the cement. The coarse and fine natural aggregate (NA) were replaced by RAP with replacement ratio of 20%, 40% and 60% by the total weight of NA. In addition, SF was added to NA concrete mixes as a control for comparison. Twenty eight mixes were produced and tested for compressive, splitting tensile and flexural strength at the age of 28 days. The results show that the mechanical properties decrease with as the content of RAP increases. And the decrease in the compressive strength was more in the fine RAP mixes compared to the coarse RAP mixes, while the decrease in the splitting tensile and flexural strength was almost the same in both mixes. Furthermore, using SF enhances the mechanical properties of RAP mixes where the optimum content of SF was found to be 10%, and the mechanical properties enhancement of coarse RAP were better than fine RAP mixes. Accordingly, the RAP has the potential to be used in the concrete pavements or in other low strength construction applications in order to reduce the negative impact of RAP on the environment and human health.

Keywords

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