Investigation on using cobalt and leach cake produced from zinc industry wastes as alternative for limestone filler in asphalt mixtures

Articles in Press

Document Type : Scientific - Research

Authors

1 civil engineering department, university of Zanjan, Zanjan, Iran

2 civil engineering department, university of zanjan, zanjan, iran

Abstract

This study aims to investigate the properties of asphalt mastics and mixtures containing zinc production wastes as filler. Limestone filler has been replaced with cobalt and leach cake in different contents of 0, 25, 50, 75 and 100% and penetration grade, softening point and ductility of the mastics and Marshall properties, indirect tensile strength (ITS) and Cantabro mass loss in dry and wet conditions were measured for the mixtures. Results show that the softening point increases, and ductility and penetration grade decreases with increasing waste fillers content, with more effect caused by cobalt cake. Results of tests on the mixtures reveal that Marshall stability increases with increasing waste filler content with more Marshall stability resulted by leach cake than cobalt cake. Furthermore, it is found that moisture damage increases with increasing waste fillers content in the mixture, with cobalt cake being more sensitive to moisture than leach cake. Cantabro loss tests reveal that the mixtures containing waste fillers are more prone to raveling than the mixture containing limestone filler, with higher loss for the mixtures containing cobalt cake. Good correlation is found between stiffening effect of the fillers and Cantabro loss. In addition, the effect of moisture on raveling in the mixtures containing cobalt cake is more than that in the mixtures containing leach cake. This research show that the leach cake filler can be used in asphalt mixture up to 75% replacement, without concerning its moisture sensitivity and the moisture sensitivity of the other combinations need to be solved.

Keywords

Quarterly Journal of Transportation Engineering

Articles in Press, Accepted Manuscript
Available Online from 25 October 2022

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History

  • Receive Date: 18 August 2022
  • Revise Date: 06 October 2022
  • Accept Date: 16 October 2022

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