Browsing by Author "Fekadu, Eshetu"

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    Exhaustive Literature Review Dealing with the Relationship between CBR, Ks, and Resilient Modulus
    (Addis Ababa University, 2015-11) Fekadu, Eshetu; Samuel, Tadesse (PhD)
    In high way formation the sub grade layer, where acts as a pavement foundation should be well designed. In order to provide a suitable design input for identifying the bearing capacity and stiffness/strength of sub grade materials, it is very important to conduct laboratory and field tests like CBR, MR and Ks. However, in the current practice it is too difficult to carry out cyclic tri axial tests for determining resilient modulus and filed plate load test for modulus of sub grade reaction, due to the unavailability of the testing apparatus widely, time consuming conducting the test and requires very high cost performing the test. This paper presents an exhaustive literature review to evaluate the suitability and reliability of different correlation equations used to calculating MR and Ks, so far developed by many writers on the relationship of CBR, MR and Ks. The work has begins with referring different papers and selecting the correlation equations studied for different type of soil natures. Then with a known CBR value calculating the value of MR and Ks for all equations on the table and plotting them on the graph. After plotting all equations on the graph, explain the behaviour and the similarity between the equations and identify which equations are better useful for predicting the values of MR and Ks. From this literature review one can have the information of how to predict the values of modulus of sub grade reaction and resilient modulus from the correlation equations without performing filed plate load test and cyclic tri axil laboratory tests.