Effects of Ageing on Warm Mix Asphalts with High Rates of Reclaimed Asphalt Pavement

Pérez-Martínez, Miguel; Marsac, Paul; Gabet, Thomas; Hammoum, Ferhat; Lopes, Manuela de Mesquita; Pouget, Simon

doi:10.1007/978-94-024-0867-6_16

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…The three mixtures tested in this study exhibited different fatigue slopes, with the 0% RAB mix having the steepest fatigue life slope. Contrary to this investigation, a number of previous studies have reported that ageing will lead to steeper slopes [ 32 ], as well as the inclusion of RA, which will lead to similar results (50% RA) [ 33 ]. Other studies have reported similar slopes between all-virgin mixes and mixes containing RA (up to 40% RA) [ 12 , 34 ].…”

Section: Resultsmentioning

confidence: 67%

Fatigue Resistance of Bituminous Mixtures and Mortars Containing High Reclaimed Asphalt Content

et al. 2020

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With the increased use of reclaimed asphalt (RA), the ability of bituminous materials to resist fatigue cracking may face a decline mainly due to the aged reclaimed asphalt binder (RAB), especially when RA is used at higher rates and not sufficiently treated. In this study, the bulk scale (asphalt) and its subscale (mortar) were employed to evaluate the effect on fatigue resistance when a RAB is added, by considering three replacement rates: 0%, 40%, and 70% RAB. The fatigue testing of asphalt mixtures was carried out using a four-point bending (4PB) setup, while the mortars were tested using a new column-like geometry utilising a dynamic shear rheometer (DSR). The fatigue properties were further analysed using dissipated energy concepts. The aim of this study was, first, to assess whether the inclusion of a RAB can provide at least similar fatigue properties compared to an all-virgin mix, and second, to evaluate whether the proposed treatment is beneficial for the mixtures with a RAB. The asphalt tests revealed that the inclusion of a 40% RAB led to increased fatigue resistance, whereas the mortar tests showed that the inclusion of RAB has an inverse effect on fatigue life.

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Section: Resultsmentioning

confidence: 67%

Fatigue Resistance of Bituminous Mixtures and Mortars Containing High Reclaimed Asphalt Content

et al. 2020

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“…Today, there is considerable focus on the concept of "environmental protection and energy conservation", and low-carbon technology for asphalt pavement construction is gaining attention [33][34][35][36][37][38][39]. Therefore, low-carbon technologies are proposed based on the two types of carbon emissions, and mainly involve carbon emission reduction in terms of energy consumption and asphalt mixtures.…”

Section: Low-carbon Technology In the Construction Of Asphalt Pavementsmentioning

confidence: 99%

Carbon Emission Calculation Method and Low-Carbon Technology for Use in Expressway Construction

Peng

Tong

Cao³

et al. 2020

Sustainability

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There is a need for a quantitative calculation method for carbon emissions during asphalt pavement construction. In this study, the carbon sources were detected and carbon emission during pavement construction was divided into two parts—the emission resulting from energy consumption and that arising from the volatilization of asphalt mixtures itself. The carbon emission calculation model of energy consumption is presented based on the energy consumption list and calorific value method proposed by the Intergovernmental Panel on Climate Change. The model of the carbon emission from volatilization of asphalt mixtures was introduced based on a combination of on-site inspection data and the greenhouse gas diffusion rate and calculated volume. Finally, high-carbon emission processes and total carbon emissions were obtained, and the corresponding low-carbon technologies were proposed for different types of carbon emissions. The results show that the ratio of carbon emission generated by energy consumption and the volatilization of asphalt mixtures is 3:2; aggregate and asphalt heating are high-carbon emission processes of energy consumption, while asphalt mixture rolling and mixing are the high-carbon emission processes of asphalt mixture. Furthermore, the use of natural gas can control carbon emission in energy consumption; low-carbon asphalt mixtures and warm mixing technology can effectively reduce carbon emission from the volatilization of asphalt mixtures. This study lays a theoretical foundation for green pavement construction.

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Evaluating the Effect of High RAP Content on Asphalt Mixtures and Binders Fatigue Behavior

Mannan

Faisal

Hasan

et al. 2018

Journal of Testing and Evaluation

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One of the main concerns with the application of reclaimed asphalt pavement (RAP) in the asphalt concrete pavement is fatigue cracking due to the stiffness increase with the addition of aged and stiff RAP binder. The purpose of this study is to evaluate fatigue performance of asphalt binder and mixtures with different RAP percentages (0, 15, 25, 35 and 40 %). Among these, 35 and 40 % RAP mixes are considered as high RAP content. This study describes the results of laboratory fatigue response of asphalt mixtures and extracted binders containing RAP to define the effect of RAP on the fatigue performance. To achieve this objective, mixes and binders were tested using the beam fatigue test and the time-sweep test, respectively. Test results were analyzed using two different fatigue approaches, reduction in stiffness and dissipated energy criteria. Results showed that a higher initial stiffness and initial dissipated energy initiate the fatigue failure faster. Since both binders and mixes show an increase in the stiffness and energy consumed per loading cycle with the addition of RAP, resulting mixes containing higher RAP have a very short fatigue life. Also, the fatigue endurance limit decreases drastically with the addition of RAP in the mix. The results comparing two different RAP sources showed that the RAP source has more prominent effect on the mix fatigue performance than the binder fatigue performance. Finally, the traditional fatigue life prediction model is modified to incorporate the effect of RAP in the fatigue equation. The modified regression model predicted reasonable fatigue life of the mixture with a coefficient of determination (R2) close to 1. The measured and predicted fatigue life results were found close to each other for both mix and binder containing RAP.

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Effects of Ageing on Warm Mix Asphalts with High Rates of Reclaimed Asphalt Pavement

Cited by 3 publications

References 4 publications

Fatigue Resistance of Bituminous Mixtures and Mortars Containing High Reclaimed Asphalt Content

Fatigue Resistance of Bituminous Mixtures and Mortars Containing High Reclaimed Asphalt Content

Carbon Emission Calculation Method and Low-Carbon Technology for Use in Expressway Construction

Evaluating the Effect of High RAP Content on Asphalt Mixtures and Binders Fatigue Behavior

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