Correlation between laboratory CBR, DCP index and physical and mechanical properties of granular soils
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Abstract
Introduction. The present study proposes the use of a simple soil evaluation test, such as the Dynamic Cone Penetration (DCP) and its correlation with the CBR (California Bearing Ratio), a widely known and used test for the evaluation of subgrade, subbase, and base soils. of and subbase, which is necessary for the design and control of the pavement structure. This study is not intended to replace the standardized soil evaluation methodology, but to strengthen the basis for preliminary pavement design. Objective. Determine the level of correlation between CBR, DCP and physical and mechanical properties of granular soils. Methodology. To conduct the study, field and laboratory tests were performed to determine the properties, for which thirty soil samples were extracted in the northern and central highlands of Ecuador. Correlations between these properties were analyzed using the least squares statistical method. Results. The granulometric distribution, consistency limits, SUCS and AASHTO classification, maximum dry density, and optimum moisture, DCP and CBR of the tested samples were obtained. With these values, several correlations of two and three variables between these properties were analyzed. Conclusion. It was concluded that there is a satisfactory level of correlation between several of the soil properties analyzed. The CBR-DCP correlation is not significantly acceptable, however, close CBR values can be obtained by using other correlations presented in this research.
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