Implementation of algorithms for asphalt moduli temperature correction

Abstract

Determination of Asphalt Concrete (AC) moduli is a critical issue in terms of pavement evaluation. AC moduli are strongly influenced by temperature variations and thus, determination of AC moduli to a common reference temperature is a complex task. Temperature correction of AC moduli has occupied many researchers over the years yielding the development of multiple algorithms. The main focus of the current research is to evaluate and compare correction results from multiple algorithms and to highlight potential differentiations that occur from their implementation. For this purpose, a road experiment was conducted based on Non Destructive Testing (NDT) techniques, including the Falling Weight Deflectometer (FWD) and the Ground Penetrating Radar (GPR). AC moduli were determined from in situ measurements and corrected to 20 °C. The aim of the experiment was to examine variations between the corrected moduli and the reference values for a untrafficked pavement. AC corrected moduli were examined and analyzed by plotting charts and through statistical processes. Statistical and further analysis of the AC moduli showed that there were large discrepancies between corrected values and real values.