Análise do grau de mistura (dob) de misturas asfálticas recicladas com variação da temperatura de usinagem, tipo e teor de rap.

Abstract

Over the years, paving has been studying the milled material, from the recycling of asphalt coatings, as a procedure to reduce production costs and the damage caused to the environment. The reuse of this material can happen in several ways and it is essential to understand the mechanisms of interaction between the aged RAP binder and the new binder. For this, there are some parameters such as the Degree of Binder Activity (DoA) and the Degree of Blending (DoB). The first represents how much of the aged binder will be available for the new mixture, being an intrinsic property of each RAP. The DoB indicates the degree of mixing between the old and new binders and depends on external factors, such as the machining parameters, so it is a challenge to be able to quantify it. Therefore, this work sought a predictive model to quantify the DoB based on the Dynamic Module test and FTIR. To achieve this model, these tests were performed in mixtures with four different RAPs, using five RAP contents and five machining temperatures. In addition, in each RAP, the DoA was quantified and a statistical analysis was performed to verify if the independent variables were significant for the result of the dynamic module. The SEM will still be performed to analyze the morphological characteristics of the mixtures. So far, most of the input variables were significant (p<0.05) and the results showed higher modulus results for temperatures where the DoA was 100%, indicating a trend towards a higher degree of mixing, which will be defined more precisely after the FTIR is performed.