Laboratory investigation of fracture and fatigue characteristics in stone mastic asphalt (SMA) mixtures containing reclaimed asphalt pavement (RAP)

Document Type : Research Paper

Authors

1 \Professor, Head of Department of Transportation, School of Civil Engineering, K.N.Toosi University of Technology, Tehran 1996715433, Iran

2 K.N. Toosi University of Technology

3 Dept. of Civil Engineering, K. N. Toosi Univ. of Technology, Tehran

Abstract

Pavement quality significantly impacts road safety, serviceability, and maintenance costs. Recently, the use of reclaimed asphalt mixtures has gained attention due to their environmental and economic benefits. However, reheating these materials for reuse can lead to asphalt aging and embrittlement. Consequently, these mixtures are susceptible to low-temperature cracking. Therefore, despite environmental and economic advantages, the unstable performance and potential for increased stiffness and cracking in stone mastic asphalt (SMA) pavements must be carefully managed to ensure durability and service life. This study investigates the fracture properties of stone mastic asphalt (SMA) mixtures at low temperature (-12°C) and fatigue behavior at intermediate temperature (25°C). Different percentages (0%, 15%, and 30%) of reclaimed asphalt pavement (RAP) were used as a substitute for aggregate in SMA mixtures to examine the effects of this substitution on mixture properties. The results indicated that the fracture energy of asphalt mixtures using rejuvenating oil was higher than those without rejuvenating oil. This increase in fracture energy was significantly observed at low temperatures. The flexibility index (FI) analysis showed that adding asphalt shingles without rejuvenating oil reduced flexibility by about 30% compared to the control sample. However, using rejuvenating oil increased the flexibility index by almost twofold compared to the control sample; with an 85% increase in the first mode of loading and a 113% increase in the second mode.

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History

  • Receive Date: 26 September 2024
  • Revise Date: 06 November 2024
  • Accept Date: 11 November 2024

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