Abstract
This research was carried out with an intention to evaluate the effects of saw dust ash on the geotechnical properties of soil from three locations in Southwestern Nigeria. Tests that were performed on three samples, A, B and C, dealt with consistency limits, specific gravity, compaction, California bearing ratio, unconfined compressive strength and shear strength. These tests were conducted at both non-stabilized and stabilized states by adding 2, 4, 6, 8 and 10% of saw dust ash. The results show that saw dust ash has improved geotechnical properties of the soil samples: maximum dry density increases from 1403 to1456 Kg/m3 and 1730 to 1785kg/m3, optimum moisture content increases from 23.6 to 28.2% and 26.2 to 29.2%, unconfined compressive strength - from 101.4 to 142.14 and 154.97 , shear strength - from 50.92 to 71.07kN/m2 and 77.49 to 105.99kN/m2 for samples A and B, respectively. Saw dust ash is therefore found to be an effective stabilizer for lateritic soils. Preface. Road failure is a common problem in Nigeria which is due to low materials application quality in road building. This article has a mission of providing some information to the road building industry that geotechnical properties of the materials they use can be improved by adding a stabilizer such as saw dust ash.DOI: http://dx.doi.org/10.5755/j01.erem.60.2.986
Highlights
Lateritic soils are often found in tropical regions which are typical of distinct wet and dry seasons
Lateritic soils are often used in tropical regions for road building
Failures on Nigeria highways are generally due to poor geotechnical properties of the underlying soils which constitute the base or sub grade material for the entire road configuration
Summary
Lateritic soils are often found in tropical regions which are typical of distinct wet and dry seasons. Lateritic soils are often used in tropical regions for road building. Failures on Nigeria highways are generally due to poor geotechnical properties of the underlying soils which constitute the base or sub grade material for the entire road configuration. Necessity to improve soil properties for road building has resulted in the use of various stabilizers (Amu et al 2010). The combination of them often results in the transformation of soil index properties which may involve the cementation of particles (Amadi 2010). Lateritic soils are widely employed as imported filling material for the prepared sub grade on different kinds of road projects. Some studies have been carried out on geotechnical properties of lateritic soil using stabilizers (Okunade 2010, Oloruntola et al 2008, Amu et al 2011, Okafor and Okonkwo 2009).
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