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

查看全文 作　　者：Emile [1,2]Mukiza;Ling-ling [2]Zhang;Xiao-ming [1]Liu 高影响力作者 机构地区：[1]School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China;[2]School of Energy and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China高影响力机构 出　　处：《International Journal of Minerals,Metallurgy and Materials》索引2020年第27卷第4期,共14页高影响力期刊 基　　金：the National Natural Science Foundation of China(Nos.51574024 and U1760112);Fundamental Research Funds for the Central Universities of China(FRF-AT-19-007). 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 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(>1μm)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. 关 键 词：RED MUD ROAD base material DURABILITY microstructure damage mechanism
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