Evaluation of Lime Pretreatment for Cementitious Stabilization of High Plasticity Soil

Abstract

This research covers the effects of CKD, fly ash, lime and CKD, and lime and fly ash on a high plasticity soil. Three percentages of CKD and fly ash along with a single percentage of lime with a percentage of CKD and fly ash was evaluated. The evaluation of each treatment included laboratory testing to determine the plasticity, shrink-swell potential, and strength characteristics of the soil and chemical combinations. The untreated soil was evaluated to create a base line for the properties. The results of the laboratory testing for each treatment (type and percentage) were compared against the untreated soil and that of similar chemical additive type. Stabilization of high plastic soils with lime as a pretreatment and CKD or fly ash as a secondary treatment is more effective for improving the engineering properties of a soil than using a single treatment like CKD or fly ash alone. Pretreatment of an A-6 soil improves the soil by: decreasing the plasticity; decreasing the BLS; and increasing the UCS.