Determination of the RAP binder relative's activation and evaluation of the interference of recycling additives in asphalt mixtures produced with 100% RAP
DOI:
https://doi.org/10.58922/transportes.v31i3.2805Keywords:
Reclaimed Asphalt Pavement, Zeolite, Cotton oilAbstract
One of the alternatives that follows the sustainability trend is the recycling of Reclaimed Asphalt Pavement (RAP). Some methods have been adopted with the aim of increasing the amount of RAP in the composition of asphalt mixtures and restoring the original characteristics of the aged binder, with emphasis on additives for warm mixtures and oils of animal and vegetable origin. This study intends to quantify the relative degree of activation of the RAP ligand (DoA') using the values of tensile strength, resilience modulus and voids content of asphalt mixtures made with 100% RAP. It also aims to evaluate the interference of the use of two additives (natural zeolite clinoptilolite and cotton oil) at different contents and conditioning temperature conditions, on the properties of tensile strength (ITS), resilient modulus and on the volumetric parameter of voids content (Vv) of asphalt mixtures with a recycling rate of 100%. The results indicate that the aged binder showed 100% activation at a temperature of 140°C. In general, compared to samples without additive, cottonseed oil had the potential to reduce ITS, MR and Vv in all evaluated temperature conditions, and it was identified that the variable “oil content” is the one that implies statistically significant variations of these parameters. The use of zeolite did not demonstrate a significant influence on ITS and MR considering the variables “zeolite content”, “temperature” and “conditioning time”. However, it was observed that the temperature of 160°C appeared to be more efficient in reducing the voids content of the samples with zeolite.
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