Durability and microstructure analysis of the road base material prepared from red mud and flue gas desulfurization fly ash
来源期刊：International Journal of Minerals Metallurgy and Materials2020年第4期
论文作者：Emile Mukiza Ling-ling Zhang Xiao-ming Liu
文章页码：555 - 568
摘 要：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 1 wt%,3 wt% and 5 wt% 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 after20 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.
Emile Mukiza1,2，Ling-ling Zhang2，Xiao-ming Liu1
1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing2. School of Energy and Environmental Engineering, University of Science and Technology Beijing
摘 要：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 1 wt%,3 wt% and 5 wt% 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 after20 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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