Análisis comparativo del CBR de laboratorio saturado y sin saturar para suelos granulares del cantón Ambato, provincia de Tungurahua

Abstract

The purpose of this experimental project is to carry out a comparative analysis of saturated and unsaturated laboratory CBR of granular soils in the Ambato canton, province of Tungurahua. To carry out the project, representative samples were taken that allowed us to determine the physical-mechanical properties through field research (field density, open pit) and laboratory (natural moisture content, plastic index, granulometry, liquid limit, plastic limit, modified Proctor, and California Bearing Ratio (CBR), and California Bearing Ratio (CBR) which was executed saturated for 24, 72, 96 hours and unsaturated), thus proving that for all the samples the soil swelling value increases as the saturation time progresses while the CBR value decreases, however 3 samples presented small variations in the last 24 hours of saturation. Four pavement designs of La Paz Street belonging to Izamba Parish were carried out to analyze how the CBR influences the design of the flexible pavement structure where it was possible to verify the decrease in the bearing capacity of the soil, due to saturation, which led to increases in the sub-base by 0.3, 1.1 and 1.3 inches, for 24, 72 and 96 hours of saturation respectively. The thicknesses of the base and the asphalt binder were kept constant; this design allowed us to have an idea of how the thicknesses of the other samples will vary according to the CBR value