Cluster phenomenon and partial differential aging in RAP mixtures

Bressi, Sara; Dumont, André-Gilles; Pittet, Michel

doi:10.1016/j.conbuildmat.2015.09.024

Cited by 34 publications

(12 citation statements)

References 7 publications

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“…Therefore, many studies have been performed to quantify the degree of blending and/or diffusion between the RAP and neat binders and the effects on pavement performance ( 9 – 13 ). In addition, extensive studies have recently been carried out by several researchers ( 14 – 16 ) to explore the phenomenon of RAP clusters. Bressi et al defined the clustering phenomenon as the agglomeration of RAP particles formed either before or during the new mix phase ( 15 ).…”

mentioning

confidence: 99%

Effect of Mixing Time and Temperature on the Homogeneity of Asphalt Mixtures Containing Reclaimed Asphalt Pavement Material

Liu

Wang

et al. 2018

Transportation Research Record

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Laboratory-produced reclaimed asphalt pavement (RAP) material, new aggregate, and tinted new binder were mixed (RAP proportion: 40%) with 12 different combinations of mixing temperatures and times, based on which circular specimens of various thicknesses were fabricated and then subjected to multi-direction indirect tensile stiffness modulus (ITSM) testing and color image analysis. Statistical calculations including average value, coefficient of variation, standard deviation, and range were carried out to investigate the effects of different mixing conditions on the homogeneity of asphalt mixtures containing RAP. The results show that the deterioration of homogeneity of asphalt mixtures containing RAP was mainly caused by the asynchronous breaking of clusters. The mixing temperature was decisive in determining the resistance of clusters to breaking, and for mixing conditions chosen in this study, the resistance increases with the increase of mixing temperature. Short mixing time might lead to a phenomenon of “momentary homogeneity,” in which clusters were not broken and the blending degree between aged and new binder was low.

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mentioning

confidence: 99%

Effect of Mixing Time and Temperature on the Homogeneity of Asphalt Mixtures Containing Reclaimed Asphalt Pavement Material

Liu

Wang

et al. 2018

Transportation Research Record

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“…The aging level of RAP binder film thickness might be changed according to depth where the mix is placed at and presence of oxygen. Bressi et al [15] proposed a methodology to detect the existence of a cluster phenomenon ( Figure 1) and they also proposed a first approach to show a different aging level in the RAP binder film thickness (i.e., partial differential aging). Stephens et al [16] also investigated the asphalt films properties for the coarse aggregates.…”

Section: Rap Binder Characteristicsmentioning

confidence: 99%

Characterization of Asphalt Mixtures Produced with Coarse and Fine Recycled Asphalt Particles

et al. 2019

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Utilizing recycled asphalt pavements (RAP) in pavement construction is known as a sustainable approach with significant economic and environmental benefits. While studying the effect of high RAP contents on the performance of hot mix asphalt (HMA) mixes has been the focus of several research projects, limited work has been done on studying the effect of RAP fraction and particle size on the overall performance of high RAP mixes produced solely with either coarse or fine RAP particles. To this end, three mixes including a conventional control mix with no RAP, a fine RAP mix (FRM) made with 35% percent fine RAP, and a coarse RAP mix (CRM) prepared with 54% of coarse RAP were designed and investigated in this study. These mixes were evaluated with respect to their rutting resistance, fatigue cracking resistance, and low temperature cracking performance. The results indicate that although the CRM had a higher RAP content, it exhibited better or at least the same performance than the FRM. The thermal stress restrained specimen testing (TSRST) results showed that the control mix performed slightly better than the CRM, while the FRM performance was adversely affected with respect to the transition temperature midpoint and the maximum tensile stress temperature. Both of the RAP incorporated mixes exhibited better rutting resistance than the control mix. With regard to fatigue cracking, the CRM performed better than the FRM. It can be concluded that the RAP particle size has a considerable effect on its contribution to the total binder content, the aggregate skeleton of the mix, and ultimately the performance of the mix. In spite of the higher RAP content in the CRM versus FRM, the satisfactory performance observed for the CRM mix indicates a great potential in producing high RAP content mixes through optimizing the RAP particle size and content. The results also suggest that the black curve gradation assumption is not representative of the actual RAP particles contribution in a high RAP mix.

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“…In the literature this grouping of RAP particles is referred to as clusters. The clusters can be already present in the mixture before the new mixing phase (old clusters), or can be created during the new mixing process (new clusters) [26]. In the zones R1 and R6, clusters formed by two coarse aggregates are shown.…”

Section: Local Behavior Of Rap Aggregates In the 40% Rap Mixturementioning

confidence: 99%

Applying a full-field measurement technique for studying the local deformation in reclaimed asphalt pavements

Teguedi

Blaysat

Moreira

et al. 2016

Construction and Building Materials

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Cluster phenomenon and partial differential aging in RAP mixtures

Cited by 34 publications

References 7 publications

Effect of Mixing Time and Temperature on the Homogeneity of Asphalt Mixtures Containing Reclaimed Asphalt Pavement Material

Effect of Mixing Time and Temperature on the Homogeneity of Asphalt Mixtures Containing Reclaimed Asphalt Pavement Material

Characterization of Asphalt Mixtures Produced with Coarse and Fine Recycled Asphalt Particles

Applying a full-field measurement technique for studying the local deformation in reclaimed asphalt pavements

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