Effect of Phophogypsum on Lime Stabilization

Abstract

The use of phosphogypsum as an additive to lime, to enhance its performance in soil stabilization, is analyzed in this paper. Phosphogypsum is a by-product of the phosphate rock processing during production of phosphoric acid. Expansive soil samples used in this paper were stabilized using three different lime proportions: initial lime consumption, optimum lime content, and less than initial lime consumption. The results reveal that the addition of phosphogypsum to lime led to improvement of both the early and late strength of stabilized soil.