Application of the Ramberg-Osgood model in asphalt technology

Seoyoung Cho,Csaba Tóth,Péter Primusz

doi:10.1088/1742-6596/1527/1/012007

Abstract

The “Time-Temperature Superposition” known from rheology has long been a useful tool for studying the behaviour of asphalt mixture. Dynamic modulus values are measured at different temperatures and frequencies can be thoroughly studied using the master curves defined by using this principle. The master curves are usually constructed using the sigmoid functions. However, other types of functions could be used for this purpose as well. One such option is the Ramberg-Osgood material model designed to model the cyclic behaviour of soils. The present article seeks to find out how accurately the use of the Ramberg-Osgood material model can describe the material behaviour of asphalt mixtures, and if there are any new highlights compared to the commonly used master curve determination techniques.

Highlights

Dynamic modulus values are measured at different temperatures and frequencies can be thoroughly studied using the master curves defined by using this principle
The load-time dependent quantities like the complex modulus can be shifted along the time axis in a temperature-dependent rate, the material properties measured at different temperatures can be plotted in a single graph, which called a master curve
The parameters of the RAMBO model can be determined by minimizing the sum of square error (SSE) of the experimental and model estimated frequencies: (9)

Summary

Introduction

Dynamic modulus values are measured at different temperatures and frequencies can be thoroughly studied using the master curves defined by using this principle. The load-time dependent quantities like the complex modulus (which is an important parameter for asphalt mixtures) can be shifted along the time axis in a temperature-dependent rate, the material properties measured at different temperatures can be plotted in a single graph, which called a master curve.

Results

Conclusion