Strength Characteristics and Microscopic Mechanism of Bauxite Slime Treated by Guar Gum
Biopolymers,as a novel environmentally friendly soil treatment and improvement material,have gained exten-sive applications in recent years,even in small quantities,due to their significant strengthening effect on soil.In this study,la-boratory experiments were conducted on bauxite slime samples treated with different concentrations(0%,1%,1.5%,and 2%)of guar gum.These experiments included testing for Atterberg limits,quick shear tests,nuclear magnetic resonance(NMR)ex-periments,and scanning electron microscopy(SEM).The experimental results indicate that with the increase in biopolymer content,both the liquid limit and shear strength of bauxite slime improved significantly.Specifically,the bauxite slime treated with 2%guar gum exhibited a 26%increase in liquid limit and a remarkable 182%increase in cohesion.NMR experiments re-vealed that guar gum could increase the moisture content of bauxite slime samples and create large internal pores within them.Additionally,SEM images confirmed the formation of a guar gum-bauxite slime matrix,thereby enhancing both the liquid limit and shear strength.
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