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Durability and microstructure analysis of the road base material prepared from red mud and flue gas desulfurization fly ash

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Abstract

The present study aimed to investigate the durability and microstructure evolution of road base materials (RBM) prepared from red mud and flue gas desulfurization fly ash. The durability testing showed that the strength of RBM with the blast furnace slag addition of 1wt%, 3wt% and 5wt% reached 3.81, 4.87, and 5.84 MPa after 5 freezing–thawing (F–T) cycles and reached 5.21, 5.75, and 6.98 MPa after 20 weting–drying (W–D) cycles, respectively. The results also indicated that hydration products were continuously formed even during W–D and F–T exposures, resulting in an increase of the strength and durability of RBM. The observed increase of macropores (>1 μm) after F–T and W–D exposures suggested that the mechanism of RBM deterioration is pore enlargement due to cracks that develop inside their matrix. Moreover, the F–T exposure showed a greater negative effect on the durability of RBM compared to the W–D exposure. The leaching tests showed that sodium and heavy metals were solidified below the minimum requirement, which indicates that these wastes are suitable for use as a natural material replacement in road base construction.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (Nos. 51574024 and U1760112) and Fundamental Research Funds for the Central Universities of China (FRF-AT-19-007).

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Authors and Affiliations

  1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Emile Mukiza & Xiao-ming Liu

  2. School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Emile Mukiza & Ling-ling Zhang

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  1. Emile Mukiza
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  2. Ling-ling Zhang
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Correspondence to Ling-ling Zhang or Xiao-ming Liu.

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Mukiza, E., Zhang, Ll. & Liu, Xm. Durability and microstructure analysis of the road base material prepared from red mud and flue gas desulfurization fly ash. Int J Miner Metall Mater 27, 555–568 (2020). https://doi.org/10.1007/s12613-019-1915-5

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  • DOI: https://doi.org/10.1007/s12613-019-1915-5

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