Abstract

SANDOVAL-VALLEJO, Eimar Andrés  and  RIVERA-MENA, William Albeiro. Correlation between CBR and Resistance to Unconfined Compression. Cienc. Ing. Neogranad. [online]. 2019, vol.29, n.1, pp.135-151. ISSN 0124-8170.  https://doi.org/10.18359/rcin.3478.

The thickness and layer properties of a pavement structure are highly determined by sub-grade stiffness. However, in some cases, performing direct stiffness tests is impossible, at least for the required frequency, which indicates that correlations with other soil properties must be used. Therefore, this paper reveals the results from an experimental program conducted to obtain correlations between the California bearing ratio (CBR) of undisturbed fine-grained soils and their unconfined compressive strength and/or some index properties. For these purposes, CBR, unconfined compressive strength, Atterberg limits, granulometry, and natural moisture content tests were performed. Thirty-eight samples were selected to guarantee a statistical power and confidence level of 95%, together with minimum Pearson correlation coefficient (r) of 0.60. Although correlating the CBR with the index properties assessed was impossible, the study made correlations between the natural and saturated CBR and unconfined compressive strength. These correlations, at r > 0.80, were then compared against the correlations reported in the literature between CBR and other undrained shear strength tests. For the same strength, the CBR values determined herein are considerably smaller than the correlations reported in the literature.

Keywords : Undisturbed CBR; Fine-Grained Soils; Unconfined Compressive Strength; Natural Moisture; Saturated Soils.

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