Preparation, characterization and properties of high anti-erosion grouting materials from industrial solid waste

To address the environmental problems caused by the storage of solid waste and the poor corrosion resistance of Portland cement (PC), high anti-erosion grouting materials (HAGM) were synthesised from red mud (RM), silica fume (SF), carbide slag (CS), and flue gas desulfurization gypsum (FGD). The synthesis, structural characterisation, and properties of HAGM were reported, and compared with those of a typical PC. The results showed that the main mineral composition of the HAGM matrix is hydration phases: 68.3 wt.% β-C 2 S, 21 wt.% C 4 AF, and 8.4 wt.% C 3 A. The compressive strength and rheological characteristics of HAGM prepared with 8 wt.% FDG is the best. The hydration of the HAGM led to the formation of ettringite, C 3 (A, F)H 6 , aluminum gel, resulted in compressive strength of 16.70 MPa after curing for 28 d. The anti-erosion coefficient K of HAGM after exposure to different erosion solutions for 28 d was greater than 0.99, which indicated better corrosion resistance than PC. This high anti-erosion resulted from the mineral composition of low C 3 S content and high C 4 AF content. This study provides a feasible and promising way for the preparation of disaster prevention materials in coastal engineering.