# Multi-Step Relaxation Characterization and Viscoelastic Modeling to Predict the Long-Term Behavior of Bitumen-Free Road Pavements Based on Polymeric Resin and Thixotropic Filler

## TL;DR

This paper studies the long-term behavior of bitumen-free road pavements using polymeric resin and examines how they relax and deform over time.

## Contribution

The study introduces a modified linear elastic–viscoelastic model to predict the long-term performance of bitumen-free pavements.

## Key findings

- Mineral fillers do not influence the relaxation behavior of the pavement material.
- The proposed model accurately predicts pavement performance in both linear and nonlinear deformation ranges.
- The model offers a practical method for forecasting the behavior of bitumen-free asphalt.

## Abstract

Asphalt pavements are fundamental to modern transportation infrastructure, requiring elasticity, firmness, and longevity. However, traditional asphalt, based on bitumen, faces several limitations. To improve pavement performance, polymer resins are being used to substitute bitumen and improve requirements. Therefore, a deep understanding of the material behavior is required. This study presents the analysis of the relaxation behavior of a poly(methyl methacrylate)-based pavement and the influence of mineral fillers. An approach using a linear elastic–viscoelastic material model was selected based on evidence and validated across the linear and nonlinear deformation range. The results reveal no influence of the mineral fillers on the relaxation behavior. The presented modification of the linear elastic and viscoelastic modeling reveals accurate results to predict long-term pavement performance. This approach offers a practical method for forecasting asphalt behavior. Further research is needed to incorporate deformation behavior into the model.