Effect of binder type on Full Depth Reclamation material behaviour

Abstract

The present study aims to evaluate the potential use of both foamed asphalt and emulsified asphalt on Full Depth Reclamation (FDR) mixtures to have better performance with four different types of FDR mixtures. Different binder combinations of adding procedures were tested to find the optimum mix design procedure. The scope of work for this research consisted of determining the optimal mixing procedure according to moisture sensitivity tests, determining the complex modulus (E∗) at different loading frequencies and testing temperatures. It was concluded that the better performance can be achieved with double coating practices. In particular, mixing procedure showed that first coating the coarse aggregate with foamed asphalt and second coating the fine aggregate with emulsified asphalt ensure the best results in terms of performance based tests. The complex modulus showed that with the use of both binders it was possible to produce a mixture with a higher modulus than mixtures characterized by a single coating.