High titanium heavy slag powder as a sustainability filler and its influence on the performance of asphalt mortar
Document Type
Article
Publication Date
7-1-2023
Publication Title
Journal of Materials Research and Technology
DOI
10.1016/j.jmrt.2023.07.037
ISSN
2238-7854
Abstract
High titanium heavy slag powder (HSP) is a typical waste with vast reserves but lacks effective disposal. This paper investigated for the first time the potential of reusing HSP as a sustainable mineral filler for asphalt mixtures. Firstly, a comprehensive comparison and analysis of the physicochemical properties of HSP and limestone powder (LSP) were conducted. Subsequently, asphalt mortars were designed, incorporating four filler-to-asphalt ratios (F/A of 0.2, 0.3, 0.4, 0.5) and five levels of HSP substitution for LSP (0%, 25%, 50%, 75%, 100%). Finally, selected properties of twenty types of asphalt mortar were tested. Compared with LSP, the HSP presented a coarser surface, more pores, smaller particle size and larger specific surface areas, which were conducive to the formation of more “structured asphalt”. Moreover, the chemical composition of HSP was complex, but it did not leach toxic elements, and the volume stability, high temperature stability, radioactivity met the requirements. However, its alkalinity was significantly lower than that of LSP, indicating weaker interactions with the asphalt. At F/A ratios of 0.2 and 0.3, the replacement of LSP with HSP resulted in a slight decrease in high temperature properties of asphalt mortars, but an improvement in low temperature performance. However, a further increase in the F/A ratio revealed an opposite trend. The properties of asphalt mortars were influenced by the combined effects of the chemical composition and physical properties of HSP. The FTIR test results indicated that no new functional groups were formed between the HSP and asphalt, suggesting primarily physical interactions.
Recommended Citation
Wang, Wei, Jie Wang, Junan Shen, Peng Guo.
2023.
"High titanium heavy slag powder as a sustainability filler and its influence on the performance of asphalt mortar."
Journal of Materials Research and Technology, 25: 5586-5599: Elsevier.
doi: 10.1016/j.jmrt.2023.07.037
https://digitalcommons.georgiasouthern.edu/civil-eng-facpubs/90
Copyright
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Comments
Georgia Southern University faculty member, Junan Shen co-authored, "High titanium heavy slag powder as a sustainability filler and its influence on the performance of asphalt mortar."