Assessing the correlation suggested by the ASTM D6951 for estimating the California Bearing Ratio using the Dynamic Cone Penetrometer in tropical soils Caio Vinícius Schlögel, Jair de Jesus Arrieta Baldovino, Ronaldo Luis dos Santos Izzo

Abstract

The main objective of this article is to compare the results obtained for California Bearings Ratio (CBR) through laboratory experiments based on the standard NBR 9895/16 and the correlation shown in the American Standard ASTM D6951/2003, which estimates the CBR values in function of the penetration by blow (DN) using the dynamic cone penetrometer (DCP). The experiments were done on a subgrade of railtrack localized in the city of Itu, state of São Paulo, southeast of Brazil. The results showed that the repeatability of the DCP makes the tool very useful for compaction quality control of soil layers based on the inclination of the DN function, estimating CBR values and resilient modulus. Nonetheless, it is important to point it out that local correlations need to be studied and made, since the equations presented by the ASTM D6951/2003 were developed for soils of different geomorphologies studied in this article, thus driving to erroneous results for tropical soils.