The Influence of Reclaimed Asphalt Pavement on the Mechanical Performance of Bituminous Mixtures. An Analysis at the Mortar Scale
| Autor: | R. Tauste, Ana E. Hidalgo, Fernando Moreno-Navarro, M. Carmen Rubio-Gámez |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Water sensitivity
Materials science Rejuvenators Geography Planning and Development 0211 other engineering and technologies TJ807-830 02 engineering and technology Management Monitoring Policy and Law TD194-195 Renewable energy sources law.invention 0203 mechanical engineering law 021105 building & construction medicine GE1-350 Composite material Ductility Fatigue rejuvenators Environmental effects of industries and plants Renewable Energy Sustainability and the Environment water sensitivity Stiffness Dynamic mechanical analysis Bituminous mixtures sustainability Durability Environmental sciences body regions Portland cement Cracking 020303 mechanical engineering & transports Sustainability Asphalt fatigue medicine.symptom Mortar RAP bituminous mixtures |
| Zdroj: | Digibug: Repositorio Institucional de la Universidad de Granada Universidad de Granada (UGR) Digibug. Repositorio Institucional de la Universidad de Granada Consejo Superior de Investigaciones Científicas (CSIC) Sustainability, Vol 12, Iss 8343, p 8343 (2020) Sustainability Volume 12 Issue 20 |
| DOI: | 10.3390/su12208343 |
| Popis: | The main characteristics of bituminous mixtures manufactured with a considerable amount of reclaimed asphalt pavement (RAP), compared to conventional mixtures, are a reduction in workability, an increase in stiffness, and a loss of ductility, due to the presence of the aged bitumen contained in the RAP particles. To minimize these impacts, softer binders or rejuvenators are commonly used in the design of these mixtures in order to restore part of the ductility lost and to reduce the stiffness. In spite of previous investigations demonstrating that the mortar plays an essential role in the workability, long-term performance, and durability of bituminous mixtures (where cracking, cohesion, and adhesion problems all start at this scale), not many studies have assessed the impacts caused by the presence of RAP. In response to this, the present paper analyzes the workability, fatigue performance, and water sensitivity of bituminous mortars containing different amounts of RAP (from 0% to 100%) and rejuvenators. Mortar specimens were compacted using a gyratory compactor and studied via dynamic mechanical analysis under three point bending configuration. The results demonstrated that the presence of RAP reduces the workability and ductility of asphalt mortars. However, it also causes an increase in their stiffness, which induces a more elastic response and causes an increase in their resistance to fatigue, which could compensate for the loss of ductility. This aspect, together with the low water sensitivity shown, when using Portland cement as an active filler, would make it possible to produce asphalt materials with high RAP contents with a similar long-term mechanical performance as traditional ones. In addition, the use of rejuvenators was demonstrated to effectively correct the negative workability and ductility impacts caused by using RAP, without affecting the fatigue resistance and material adhesion/cohesion. |
| Databáze: | OpenAIRE |
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