Browsing by Author "Solomon, Tibebu"

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    Assessment of Damages Caused by Expansive Soil on Buildings Constructed in Bahir Dar
    (Addis Ababa University, 2015-12) Solomon, Tibebu; Haile, Messele (PhD)
    In this study it has been tried to assess the extent of damages caused by expansive soil on buildings constructed in Bahir Dar. Seventy Eight buildings were randomly selected from 20 different expansive soil locations. The assessment showed that out of those 78 buildings 68(87%) of them are adversely affected. In most buildings more than one building components are damaged. The damage has been analyzed and interpreted systematically with respect to type of foundation, wall, floor, pavement, door, window and fence. The extent of damage is very high on pavements and decreases when we proceed to walls, floors and foundation in their respective orders. The study showed that the main cause of failure is fluctuation of ground water table. In addition to this poor surface drainage, presence of tress and vegetation close to buildings, damaged utility lines and improper design also have great contributions. Based on the causes of failures and other factors attempt was made to propose remedial measures for already damaged buildings constructed in expansive soil locations of the study area. In addition to this suitable foundation types and construction details have been also proposed for new buildings to be constructed in these areas.
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    A Study on Assessment and Comparison of Schmidt Rebound Hammer Test Result Against Uniaxial and Core Test of Concrete
    (Addis Ababa University, 2022-06) Solomon, Tibebu; Abebe, Dinku (Prof.)
    Concrete is a mixture of cement, coarse aggregate, sand and water. This mixture is expected to form a homogeneous material with predictable strength behavior. However, it is very difficult to develop a model to correctly evaluate its onsite strength properties. Common methods used in evaluating and estimating concrete structures are uniaxial compressive strength; core test; and rebound hammer test. This research presents the assessment of compressive strength of cocnrete using rebound hammer, core test and uniaxial compressive strength test to develop relationship between these methods. In this study, cube samples, rebound hammer reading and core samples were extracted from the concrete slabs casted both from two control mix slabs and from four selected project sites for this analysis. Rebound hammer reading and core drilling operations were performed from the casted slabs the same data were collected from rebound hammer versus the project sites under investigation. Descriptive statistical data analysis such as the mean and standard deviation were computed between hammer versus cube and core versus cube strength. The relationship obtained from the variables is expressed as compressive strength of core is 0.732844 times cube strength and compressive strength of rebound hammer 1.11612321 times cube strength and compressive strength estimated from rebound hammer is 1.5241 times compressive strength of core.