Correlación entre el índice de rugosidad internacional (IRI) y deflexiones medidas mediante deflectometría de impacto (FWD) para la optimización del análisis de desempeño del pavimento

Abstract

The road parameters of functionality and structural capacity are indicators to evaluate the pavements based on the service level and capacity. (AASHTO, 1993) In Ecuador, the lack of control and maintenance is due to the low availability of evaluation equipment such as the Falling Weight Deflectometer (FWD). In the present research, a relation between the International Roughness Index (IRI) and the deflection measured with (FWD) on the Cuenca – Molleturo road is search, in the section between the abscissa 10+000 and 30+000. For the IRI measurement, the mobile applications RoadRoid and IRI.Calc.Free are used, which must be calibrated in order to validate the measurements. Through the use of digital tools, georeference, tabulation and data filtration are used to analyze the parameters that affect this type of measurements. In addition, deflection measurements with Falling Weight Deflectometer are provided by the MTOP. A sensitivity analysis of variables is used to find the maximum coefficient correlation possible. The results reached using a sensibility analysis show that exist a better relationship between IRI and the deflection, if consider: the central deflections, an interval of 100m the implementation of the moving average of 10th order, a determination coefficient of 0.26. In addition, when estimating the IRI for the same date when deflections were measured, a determination coefficient of 0.406 is reached, concluding that the relationship decreases with the time.