《Table 1–Wet sieve fractions as a proportion of<2 mm residue samples.》

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《Changes in distribution and microstructure of bauxite residue aggregates following amendments addition》

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Residue aggregate size distribution results obtained from wetsieving are presented in Table 1.Aggregate contents with different treatments decreased in the following order:PRA4（<0.05 mm）>PRA3（0.25–0.05 mm）>PRA2（1–0.25 mm）>PRA1（2–1 mm）.In the unamended residue，PRA3and PRA4accounted for 40.5%and 52.3%，respectively.With addition of gypsum（BG1），PRA1，PRA2and PRA4increased to 0.9%，9.4%and 65.2%，respectively，while PRA3decreased from 40.5%to 24.5%.Compared to gypsum，residues treated with vermicompost had higher values of PRA1and PRA2，which demonstrated that vermicompost was beneficial to water-stable aggregates formation.Following the combined addition，PRA1and PRA2increased significantly，which showed that it was an effective combination to improve physical condition of bauxite residue.Meanwhile，the variety characteristics of PRA4exhibited little regulation under amendments addition which may due to the uncertainty of aggregate formation process as aggregate model in bauxite residue was still unknown（Zhu et al.，2017）.