EVALUATION OF STRENGTH CHARACTERISTICS OF CLAY STABILIZED WITH SUGAR CANE STRAW ASH AND LIME

MODESTUS AFAMEFULE NNADI (NAU/2016224013)

Abstract


The study was conducted to evaluate the strength characteristics of clay soil stabilized with lime and sugar cane straw ash. The natural clay was partially admixed with lime and sugar cane straw ash in a stepped increase of 2% by dry weight of natural clay, geotechnical test were carried out to determine the strength properties of natural clay stabilized with lime and sugar cane straw ash.This test includes: Sieve analysis test, moisture content test, Atterberg limit(liquid limit, plastic limit) test, specific gravity, compaction and California bearing ratio test. Sieve analysis test conducted for natural clay classify the sample as A-7-6 according to AASHTO classification system and CH (clay of high plasticity) according to USCS classification system, moisture content result of natural clay to lime mixture ranges from 34.58% to 41.38%, natural clay to sugarcane straw ash ranges from 34.58% to 35.95% at 2%SCSA content beyond 2%SCSA content, moisture content decreased, natural clay to lime to sugar cane straw ash mixture decreased from 34.58% to 31.17% at 6%LM & SCSA contentbeyond this point, moisture content increased. Specific gravity result of natural clay to lime ranges from 2.66 to 2.91, natural clay to sugar cane straw ash ranges from 2.66 to 2.48 and natural clay to lime to sugar cane straw ash ranges from 2.62 to 2.52 after 10% LM & SCSA content. Atterberg limitresult for natural clay to mixture suggest that the liquid limit ranges from54.46% to 72.14%, plastic limit ranging from 33.66% to 50.2% and plasticity index value ranging from 20.9% to 21.94%, natural clay to sugar cane strawash suggest a liquid limit ranging from 54.46% to 43.5%, plastic limit ranging from 33.66% to 20.72% and plasticity index ranging from 20.9% to 22.78%. Compaction test result for natural clay to lime mixture suggest that the maximum dry unit weight ranges from 20.29kN/m3 to 22.19kN/m3with optimum moisture content ranging from 17.78% to 12.21%, natural clay to sugar cane straw ash mixture suggest that the maximum dry unit weight rangesfrom 20.29kN/m3 to 16.9kN/m3 with optimum moisture content ranging from 17.78% to 22.57%, natural clay to lime to sugar cane straw ash mixture ranging from 20.29kN/m3 to 20.75kN/m3 with optimum moisture content ranging from 17.78% to 16.42%. California bearing ratio result of natural clay to lime tosugar cane straw ash for the soaked sample ranges from 14% to 17% at 4%LM & SCSA content beyond this point, the California bearing ratio decreased, while the California bearing ratio of the unsoaked sample ranges from 14.5% to 22% at 8%LM & SCSA content but decreased at 10%LM & SCSA content. It was observed that addition of lime and sugar cane straw ash recorded anearly improvement in strength properties of natural clay with the improved strength satisfying the requirement for use only at the sub-grade level of pavement construction.

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