Characterization Performance of Composite Stabilizer Materials on Soft Clay Soils Modification for Highway Pavement

摘要

The study examined the expansive clay soils of Niger Delta with deceptive characteristics inphysical appearance, swelling and shrinkage apparent and their improvement / modifications with compositematerials of irvinga gabonesis ash and lime in blended condition. Basis tests classified the soils as A–7–6/CHon the AASHTO Classification Schemes/Unified Soil Classification System and other parameters as shown intable 3.1. Preliminary test results revealed the soils are unstable for road constructional purposes exceptmodified. Final modified soil test results obtained showed the inclusion of additives increased the maximum drydensity and optimum moisture content compaction parameters of expansive clay soils with increase in values tocorresponding percentages ratio. Comparative results showed increased values in stabilized soils to unstabilized.Optimum inclusion values were gotten at 7.5% + 7.5% percentage ratio, beyond this ratio, reductionin values were noticed with visual cracks. This point signified failure potential. Unconfined compressivestrength results showed increased values with percentage inclusion ratio. Comparatively from both results,modified clay soils plastic index properties decreased with additive percentages inclusion ratio against unstabilized.Entire performed test results showed the potential of used of irvinga gabonesis ash and lime asexpansive stabilizers.