masterThesis
Evaluación de la capacidad resistente (CBR) en bases granulares de materiales procedentes del rio Paute
Fecha
2022-07-21Autor
Tepán Vele, Xavier Jacinto
Institución
Resumen
In road construction, pavements are composed of layers whose strength decreases
with depth. The layers on which the wearing courses are laid are called "Base
Course". In Ecuador, the characteristics are established in the General
Specifications for the Construction of Roads and Bridges, 2002 Edition, Sections
404 and 814. During quality controls in road construction, appreciable variations are
obtained in the results of granulometric tests (INEN 696), although the aggregates
present continuous granulometry and remain within the granulometric limits.
However, the value of the California Bearing Rate, CBR (ASTM D1833) upper than
80% obtained in the laboratory, is achieved only with a granulometric spindle. The
study revealed the variations of the CBR in granular materials, depending on the
granulometric composition. For this purpose, mixtures of materials were made in the
laboratory (materials obtained from the crushing process), that represent the
granulometric curves of Class 1B base materials (upper, intermediate, and lower
limit of the granulometric range of Table 404-1.1 - MOP 2002). The results showed
that the difference between the maximum unit weight values is negligible. In the CBR
tests, however, there was a significant difference between the results obtained at the
upper and lower granulometric gradation limits.