The Effect Of Random Inclusion Of Teff Straw On Shear Strength Characteristics Of Addis Ababa Expansive Soil

Investigation of agricultural crop products as a reinforcement material in Geotechnicalrnengineering has brought both economic and environmental advantages due to rising costrnof the physical and/or chemical methods of conventional soil stabilization.rnIn Ethiopia, there is huge byproduct of teff straw which is used as reinforcing material forrnthe locally constructed mud houses. This research work focuses on using of teff strawrnwith varying percentages and examines its effects on shear strength characteristics ofrnexpansive soils. The laboratory investigations conducted includes particle size analysis,rnfree swell test, Atterberg limit tests, unsoaked CBR tests and unconfined compressionrntests.rnAccordingly, the investigation of the soil belongs to A-7-5 class of soil in the AASHTOrnclassification system and CH in the USCS classification which has very poor strength.rnThe soil was reinforced with teff straw in stepped proportions of 0.2%,0.4%,0.6%,0.8%rnand 1% by dry weight of soil.rnThe test results reveal that the inclusion of randomly distributed teff straw in the soilrnincreases unconfined compressive strength and unsoaked CBR values and reduces thernliquid limit and plasticity index of the treated soil.rnIt is observed that the optimum teff straw content for achieving maximum unconfinedrncompressive strength and unsoaked CBR is 0.6% in terms of dry weight of the soil.

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