Samuel Tadesse (PhD)Samson Molla2025-05-142025-05-142025-04https://etd.aau.edu.et/handle/123456789/5450The significant advantage of the Dynamic Cone Penetration (DCP) test is that it is a low cost, robust apparatus that is quick and simple to use. With the DCP testing, very little damage is made to the pavement being tested (effectively non-destructive) whereas very useful information is obtained. Another interesting advantage of the test is that the pavement is tested in the condition at which it performs. The simplicity of the test allows repeated testing to minimize errors and also to account for temporal effects. On the other hand, California Bearing Ratio (CBR) is a very popular in the construction industry especially, in road construction as a soil support value of the pavement. However, CBR cannot be easily determined in the field. This initiated the need to investigate the relationship CBR value has with other field tests like DCP. As part of this study, primary field and laboratory subgrade tests for the locally available subgrade soil of the case project, Beredimtu – Imi – Gode road project, were conducted. Using the test results, the relationship between field and laboratory subgrade soil strength tests were in-depth investigated. Based on this laboratory and field test results, CBR values were correlated with DCPI values using a simple regression coming up with an R2 of 0.958 and low standard error of estimate. On the other hand, the CBR has been correlated with the DCPI and the bulk density using a multiple regression technique with the equation having and R2 of 0.854. Hence, the equation obtained with and R2 of 0.958 is used for validation puepose.en-USCalifornia Bearing RatioDynamic Cone PenetrometerIndex PropertiesRegression AnalysisThesis