Significance of Sampling Location and Percentage Replacement of Additives on Index Properties of Stabilised Subgrade Soils: A Statistical Approach
Journal Title: IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) - Year 2018, Vol 15, Issue 6
Abstract
Laboratory tests were conducted on soil samples collected from three locations namely, Osu, Ajebandele and Aba-gbooro, in Osun state. Some geotechnical properties of soils were examined, thereafter steel slag (SS) collected from Ife Iron and Steel Company and saw dust ash (SDA) obtained from open air burning of saw dust collected from a saw mill in Ile-Ife were added to the soils at 20, 15, 10 and 5 % replacement of soil with SS and 10, 7, 5 and 3 % replacement of SS with SDA in order to determine their effects on consistency and compaction characteristics of the selected subgrade soils. Liquid limits (LL) of the soil samples were >50 % for subgrade (INDOT, 2008). At 20 % replacement, average LL was 43.52 % and 43.67 % for soil+SS and soil+SS+SDA mix respectively. Plasticity of sample A remained intermediate (i.e. 35 – 50 %); while samples B and C reduced from intermediate to low plasticity (i.e. < 35 %) with the addition of SS and SDA (Withlow, 1995). The MDD of the soil samples reduced for all mixes with SS only. MDD was highest for samples A and B at 5 and 7 % SDA, while sample C improved at all mix ratios. The study concluded that consistency of the soil samples reduced at high percentages of additives (i.e. 10 – 20 %). SS had no significant effects on the MDD and OMC of samples A, B and C for all mix ratios, except at 15 and 20 % SS respectively for sample C. The addition of 10 – 15 % saw dust ash into the mix ratio increased the MDD significantly for all samples; while OMC decreased at all mix ratios.
Authors and Affiliations
Elufowoju Emmanuel Fisayo, Fajobi Adeyemi Babayemi
Keywords
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- EP ID EP438871
- DOI 10.9790/1684-1506020615.
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