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Title: Investigation into the appropriate laboratory testing procedures for the determination of the index properties of the Lateritic Soils of Western Ethiopia (Nedjo-Jarso-Begi Road area)
Authors: Wossen, Million
Advisors: Dr. Mesele Haile
Keywords: laboratory testing procedures
Copyright: Nov-2009
Date Added: 30-Apr-2012
Publisher: AAU
Abstract: The appropriate laboratory testing procedures while carrying out index property tests of lateritic soils found in western Ethiopia (Nedjo, Jarso and Begi areas) have been investigated. Classification and composition of these soils have also been studied. The X-Ray Diffraction (XRD) analyses revealed that the soils in these areas are composed of minerals of Kaolinite and Smectite groups; such as Kaolinite, Quartz, Hematite, Vermiculite, Dickite, Borax, Illite, Nacrite. The X-Ray Fluorescent (XRF) analysis showed that there is a high concentration of sesquioxide minerals and there is no amorphous material present in the soils. Comparison between the moisture contents determined using air drying (or alternatively 50oC oven drying temperature) and that of 105oC oven drying temperatures indicates that there is no significant amount of structural water; however, comparing to the non-lateritic soils from Addis Ababa, the western Ethiopia lateritic soils have some amount of structural water or water of hydration. In the analysis of Atterberg Limits, in majority of the soils difference was observed between the Atterberg Limits obtained from test on a specimen mixed for 5min and that of 30min, this indicates that the cementation of the clay particles is to be disaggregated with higher mixing time. Analysis of specific gravities of the soils using various pretreatment and testing procedures showed that, increase in drying temperature from its in situ condition to an air-dried or equivalent of 50oC oven drying temperature and further to 105oC oven drying temperature reduces specific gravity of the soils. Analyses of the grain-size distributions (grading curves) with respect to the effects of different testing procedures (pre-test treatment methods), the effects of specific gravity variation within a sample, and the variation of sample location /depth/ and other physical properties indicated that the soils were not homogeneous within the laterite zone. The dry sample preparation and testing procedures tends to decrease the percentage of coarser particles as the coarser particles became highly fractured during the pulverization process. As a result these dry sieving techniques were found to be
URI: http://hdl.handle.net/123456789/2009
Appears in:Thesis - Civil Engineering

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