Diseño y evaluación de una base estabilizada con emulsión asfáltica y cal (BSM) mediante metodología SABITA aplicada a la rehabilitación de una vía existente.

Abstract

This research evaluates the design and mechanical behavior of a base stabilized with asphalt emulsion and lime (BSM) using the SABITA methodology, applied to the rehabilitation of the La Victoria–T de Baba road in Guayas Province. A geotechnical exploration program involving 25 test pits distributed over approximately 20 km was conducted to characterize the existing materials. Subsequently, the Class 1A base material selected for the design was characterized, yielding a GP-GC classification, a maximum dry density of 2167 kg/m³, an optimum moisture content of 10%, and a CBR of 83%. Different lime and asphalt emulsion dosages were evaluated through indirect tensile strength (ITS) tests under dry and wet conditions to determine the Tensile Strength Ratio (TSR). The selected dosage consisted of 2% lime and 3% emulsion, resulting in values of 218.8 kPa for dry ITS, 206.4 kPa for wet ITS, and 94.3% for TSR. Additionally, isotropic triaxial tests and on-site quality control checks were performed to assess performance. The results demonstrate the technical viability of BSM as an alternative for road rehabilitation under the conditions studied.