Abstract
The use of Half Warm Mixes with high Reclaimed Asphalt content (HWMRA) has the potential to generate significant environmental advantages such as the reduction in consumption of natural resources and the emission of gases into the atmosphere. This paper therefore focuses on demonstrating the viability of using these types of mixes in wearing courses. For this purpose, an HWMRA with 70 % and 100 % Reclaimed Asphalt Pavement (RAP) and emulsion were designed in the laboratory. The performance of the mixes was then assessed and compared with that of conventional Hot Mix Asphalt. In a second stage, the mixes were manufactured in-plant, and laid and compacted in an Accelerated Pavement Test track. The cores were then extracted and tested for stiffness modulus and resistance to fatigue. The results from the tests conducted with both the laboratory specimens and the cores showed that the performance of HWMRA is comparable to that of HMA. These findings encourage greater confidence in promoting the use of these types of sustainable asphalt mixes.
Highlights
RESUMEN: Evaluación del comportamiento mecánico de mezclas asfálticas templadas con 100 % de material reciclado
Environmental concerns regarding the production of asphalt mixes are currently related to the use of virgin materials and the high temperatures used to manufacture Hot Mix Asphalt (HMA), which generate harmful emissions [1, 2]
In order to diminish the harmful emissions released into the atmosphere when HMA is produced, there have been attempts to reduce the manufacturing temperatures of asphalt mixes by treating the bitumen to reduce its viscosity at the time of mixing
Summary
RESUMEN: Evaluación del comportamiento mecánico de mezclas asfálticas templadas con 100 % de material reciclado. Environmental concerns regarding the production of asphalt mixes are currently related to the use of virgin materials and the high temperatures used to manufacture Hot Mix Asphalt (HMA), which generate harmful emissions [1, 2]. In spite of the environmental and economic advantages of using these types of mixes, a number of questions remain regarding their performance This issue prevents their widespread use, in wearing courses (due to the high requirements of this layer). Mixes containing a high RAP content manufactured with low temperature technologies have been shown to have better (or equivalent) fatigue and rutting resistance when compared with HMA, without any adverse effects on water sensitivity [7,16,17]. Field experiences have demonstrated the suitability of combining the use of RAP with lower manufacturing temperatures [18]
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