Astudy on The Effect of Remolding on The Mechanical Behavior of Addis Ababa Red Clay Soil

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Addis Ababa University


This research work tries to see the effect of soil remolding on the mechanical behavior of red clay of Addis Ababa. It is tried to identify the effect of remolding by conducting a series of laboratory tests such as triaxial compression and consolidation tests on the undisturbed and remolded soil samples. The soil was remolded by compacting at OMC. It was also done basic tests to see the engineering properties of the soils. The one dimensional consolidation tests were done on samples of diameters of 50mm and 70mm and height of 18mm with the effective consolidation stresses of 50 kpa to 1600 kpa. A total of eight onedimensional consolidation tests were run, out of which four were undisturbed and four were remolded samples. The deformation and hydromechanical /permeability while loading/ behavior were examined using the one dimensional consolidation test. The triaxial tests were done on samples of 38mm and height of twice the diameter. Two triaxial testing machines were employed on the testing program. Soil samples collected from Kolfe areas were conducted on the newly acquired Automatic triaxial testing machines and samples collected from Addisu Gebeya area were tested on the semi automatic triaxial compression machine procured two years ago. The type of triaxial test employed was Consolidated undrained/CU/ with pore pressure measurement and with the effective consolidation pressure of 150 kpa, 250 kpa and 350 kpa. A total of twenty-four triaxial CU tests were run out of which twelve were undisturbed and twelve were remolded. The results of triaxial tests were used to examine the stress-strain and strength behavior. The results show that remolding reduces the peak deviator stress, effective cohesion and permeability and increases amount of compression and time required for consolidation



Clay ;soil