BI-LOGARITHMIC CORRELATION EQUATION TO EVALUATE THE CBR WITH DCP INDEX OF QUARRY MATERIAL

Quispe I.F.S.; Tito J.C.S.; Loayza J.F.M.; Zamora M.W.E. · International Journal of GEOMATE (2022) · DOI: 10.21660/2022.97.3353

Resumen

The purpose of this research was to establish a correlation between the DCP Index measured with the Dynamic Cone Penetrometer (DCP) device and the CBR laboratory test results of the Vicho quarry soil, evaluated on the same compacted specimens, which allows the evaluation of the in situ CBR of the pavement subbase courses constructed with material from the Vicho quarry, during the construction process of road projects in the city of Cusco. The bi-logarithmic correlation equation, determined based on the laboratory test results, between the DCP Index and the CBR values for the Vicho quarry soil is Log(CBR)= 2.6838 - 1.21189 Log(DCP) with a reliably coefficient of determination of R2= 95.91%. This coefficient represents that the equation is appropriate for evaluating the in situ CBR value of the subbase course in road pavements of Cusco city constructed with the Vicho quarry soil, allowing also the evaluation of the adequate functional and structural performance of the pavement structural layer according to the provisions of the project design. The test specimens were compacted with certain percentages of the modified Proctor compaction energy, and then the DCP Index values were evaluated on the compacted specimens previously tested with the CBR laboratory tests. As part of the laboratory test results, the physical properties of the material from the Vicho quarry, to construct the subbase course of pavements, are: w = 5.67 %, LL = 23.74%, LP = 18.09%, PI = 5.65%, thus, the soil is type A-1-a(0) according to the AASHTO soil classification system, and the results of the modified Proctor compaction test are: γd(max) = 21.87 KN/m3 and wopt = 7.10 % © Int. J. of GEOMATE All rights reserved, including making copies unless permission is obtained from the copyright proprietors

Instituciones: Universidad Nacional de San Antonio Abad del Cusco