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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/1477

Authors: Dagmawe, Negussie
Advisors: Professor Alemayehu Teferra
Copyright: 2007
Date Added: 17-Oct-2008
Publisher: Addis Ababa University
Abstract: In this study, the relationship between Index Property and Swelling characteristic of Expansive soil of Bahir Dar is examined. The test results showed that the Specific Gravity ranges from 2.55 to 2.81. The Index Property Test showed that Plasticity Index ranges from 44.5 to 76.42%. The clay content of the soil is from 55.4 to 87%. Free Swell tests conducted on the collected samples showed a range from 78 to 215%. According to the Unified Soil Classification System. The soil is categorized as Fat or Organic Clay with a potential of expansion. AASHTO Classification System also shows that the soil is Plastic Clay with high volume change capacity. The dry density of the soil, which samples were taken from, ranges between 1.04 and 1.39 gm/cc. Another test conducted using one-dimensional consolidometer showed that the Swelling Pressure of the area ranges between 75.95 and 547.52 kpa. Relationship observed between Index Property and swelling characteristic of the area showed that with the increment of clay content in the soil the Plasticity Index, the Cation Exchange Capacity and the w max 24 is increased. The increment of the Plasticity Index is in turn reflected in increasing the swelling pressure of the soil. Dry Density of the soil also increases the swelling pressure. On the other hand Natural Moisture content affects the swelling pressure negatively. A single Index Property is not a reliable means of predicting the swelling pressure of the soil while a better estimation is observed when different Index Properties are involved in prediction the swelling pressure The relation of (w max 24/w)*gd or (w max 24/w) with swelling pressure showed a better indicative value than the PI for the study area.
Description: A Thesis Submitted to the School of Graduate Studies of Addis Ababa University in partial fulfillment of the Requirement of the Degree of Master of Science in Civil Engineering (Geotechniques)
URI: http://hdl.handle.net/123456789/1477
Appears in:Thesis - Civil Engineering

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