Desempenho mecânico de misturas 100% RAP com adição de emulsão asfáltica com camada de base

Abstract

Pavement recycling has shown potential to improve the quality of pavements, with satisfactory results in terms of mechanical performance and durability. Given the relevance of this topic and the increasing use of recycled asphalt mixes, it is essential to deepen knowledge about their mechanical performance and understand the behavior of these mixes under different conditions, to further ensure their effectiveness and safety in road works application. Currently, there are the most diverse recycling techniques, in this work we evaluated the mechanical performance of cold recycled mixtures using milled material and asphalt emulsion, for use as a base layer. The milled material is of the RAP-BR290 type, originating from road maintenance and conservation processes on the stretch of the BR-290/RS highway. Emulsions used are slow breaking type with and without rejuvenating agent. The samples were molded using the modified energy compaction process. Triaxial tests of repeated loads were carried out to obtain the resilience modules (MR). A comparison of the MR values was made with the modules of the M5-100% RAP-BR mixture evaluated in Santos' master's thesis (2021), which has the same recycled material, only without the addition of emulsion. A comparative mechanistic analysis was also carried out, using MeDiNa, of the materials studied in this work with the M5-100% RAP-BR material. Based on these analyses, the analyzed structures obtained a reduction in the thickness of the coating layers, a lower percentage of cracked area, achieving a longer service life.