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Large-scale utilization of desulfurization ash and fly ash for unfired production of high-strength road-base stones

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Abstract

This paper utilizes desulfurization ash (DA), fly ash (FA) and ordinary Portland cement (OPC) to prepare unfired high-strength road-base stones by static pressure forming. The compressive strength after 28 days curing of road-base stones reaches 82.9 MPa for 30% DA, 52.5% FA and 17.5% OPC composition. The XRD, FTIR, and TG prove that the hydration reaction between DA, FA and OPC can produce a large amount of structurally dense C-S-H gels and Ettringite in the road-base stones, and the static pressure forming can increase the contact area between particles, which continuously enhance the cementitious activity of the road-base stones, resulting in such high strength. In addition, the road-base stones utilize 82.5% solid waste, meanwhile save about 49.7 ¥/ton compared to that of using natural materials. Therefore, this work not only provides an ecological and economic way for large-scale utilization of DA and FA in road construction, but also provides a novel approach to guide other industrial solid wastes recycling.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (U21A20321, 51972019) and National Key Research and Development Plan of China (2020YFB0606205).

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Authors and Affiliations

  1. State Key Laboratory of Advanced Metallurgy, School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Hongxue Ma, Guangchao Hu, Le Zhang, Xiangtao Huo, Min Guo & Mei Zhang

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  1. Hongxue Ma
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  2. Guangchao Hu
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Ma, H., Hu, G., Zhang, L. et al. Large-scale utilization of desulfurization ash and fly ash for unfired production of high-strength road-base stones. J Mater Cycles Waste Manag 25, 2222–2231 (2023). https://doi.org/10.1007/s10163-023-01677-w

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