Análise da variabilidade do fresado asfáltico e seu impacto na pavimentação asfáltica

Abstract

Reclaimed asphalt pavement (RAP) is beneficial to reducing the consumption of virgin materials, but it is necessary to be careful not to affect the performance of the asphalt pavement. A major concern with RAP relates to the variability of the material which comes from different sources, and how this variability impacts the pavement. The objective of this study was to analyze the variability of particle sizes, binder content and viscosity from RAP samples from the Fortaleza metropolitan region and to verify the mechanical and economic impact of such variability. The collected material in Insttale Engenharia was fractionated and it was later characterized according to the mentioned characteristics. From the results, the impacts caused by the heterogeneity of the material in the air voids, tensile strength and resilience modulus were analyzed. The characterization resulted in a coefficient of variation of 9.96% for the binder content and 7.02% for the viscosity. The particle size distribution, however, presented low variation which indicated that with adequate processing the material is only slightly heterogeneous. It was found that the variability of RAP’s percentage in the mix did not affect air voids or tensile strength. However, the resilient modulus proved to be affected by RAP’s variability with its coefficient of variation ranging from 5.21% in a mixture with no RAP to 12.31% in a mixture with RAP. With respect to economical aspects, an adequate processing of the material proved to be beneficial with a difference of 3.68% between the highest and lowest cost reduction when taking into account the contribution of the aged binder to the mixture