Binder availability and blending efficiency of reclaimed asphalt: A state-of-the-art review

Ma, Yuetan; Zheng, Kunpeng; Ding, Yongjie; Polaczyk, Pawel; Jiang, Xi; Huang, Baoshan

doi:10.1016/j.conbuildmat.2022.129334

Cited by 15 publications

(2 citation statements)

References 76 publications

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“…This declining trend can be partly attributed to the stiff aged binder from RAP. Additionally, the degree of blending between aged and virgin asphalt, as emphasized in recent investigations [59,60], might also influence this outcome. The role of binder activity is another contributing factor to consider [61].…”

Section: Indirect Tensile Cracking Testmentioning

confidence: 91%

Performance Evaluation of Asphalt Mixtures Containing Different Proportions of Alternative Materials

Khorshidi,

Goli,

Orešković

et al. 2023

Sustainability

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With the increasing scarcity and cost of virgin materials for asphalt mixtures, the exploration of alternative components has intensified. Reclaimed asphalt pavement (RAP), crumb rubber (CR), steel slag (SS), and waste engine oil (WEO) have emerged as promising alternatives. Individually, RAP enhances rutting resistance but may compromise cracking tolerance; CR boosts cracking resistance; WEO affects cracking and rutting differently; and SS can influence moisture sensitivity. However, their combined impacts on asphalt performance, specifically on moisture damage, rutting, and cracking resistance, remain underexplored. In this study, 44 mixtures were assessed with varying RAP (0–75%), WEO (0–15%), and CR (0–15%) contents, alongside a constant SS aggregate (0% or 20%). The results indicate that specific combinations of these alternative materials can satisfy all performance thresholds for rutting, cracking, and moisture damage. To pinpoint ranges of optimal material contents for different high-traffic scenarios, prediction models were crafted using techniques like feed-forward neural network (FNN), generalized linear model (GLM), support vector regression (SVM), and Gaussian process regression (GPR). Among these, GPR demonstrated superior efficacy, effectively identifying regions of satisfactory performance.

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Section: Indirect Tensile Cracking Testmentioning

confidence: 91%

Performance Evaluation of Asphalt Mixtures Containing Different Proportions of Alternative Materials

Khorshidi,

Goli,

Orešković

et al. 2023

Sustainability

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“…The use of reclaimed asphalt pavement (RAP) as recycled aggregate and rejuvenated binder has become popular worldwide, and RAP is one of the most reused building materials [ 25 , 37 ]. Its blending efficiency depends on several variables such as the effective binder content, the quality of the aged bitumen, and the production process [ 38 ]. In the literature, several studies investigated the feasibility of using RAP to produce recycled HMA [ 39 ] and lots of mixtures with different RAP contents have been investigated to identify the optimum bitumen content (OBC) [ 40 , 41 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis of Hot-Mix Asphalt (HMA) Mixtures with Reclaimed Asphalt Pavement (RAP) in Railway Sub-Ballast

et al. 2023

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Environmental safeguards promote innovative construction technologies for sustainable pavements. On these premises, this study investigated four hot mix asphalt (HMA) mixtures—i.e., A, B, C, and D—for the railway sub-ballast layer with 0%, 10%, 20%, and 30% reclaimed asphalt pavement (RAP) by total aggregate mass and a rejuvenator additive, varying the bitumen content between 3.5% and 5.0%. Both Marshall and gyratory compactor design methods have been performed, matching the stability, indirect tensile strength, and volumetric properties of each mixture. Dynamic stiffness and fatigue resistance tests provided mechanical performances. Laboratory results highlighted that the RAP and the rejuvenator additive increase the mechanical properties of the mixtures. In addition, the comparative analysis of production costs revealed up to 20% savings as the RAP content increased, and the life cycle impact analysis (LCIA) proved a reduction of the environmental impacts (up to 2% for resource use-fossils, up to 7% for climate change, and up to 13% for water use). The experimental results confirm that HMA containing RAP has mechanical performances higher than the reference mixture with only virgin raw materials. These findings could contribute to waste management and reduce the environmental and economic costs, since the use of RAP in the sub-ballast is not, so far, provided in the Italian specifications for railway construction.

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Blending of Virgin and RAP Binder for Asphalt Mixes with High RAP Contents: A Pilot Study

Lewis,

Coleri,

Sukhija

et al. 2024

Int. J. Pavement Res. Technol.

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Binder availability and blending efficiency of reclaimed asphalt: A state-of-the-art review

Cited by 15 publications

References 76 publications

Performance Evaluation of Asphalt Mixtures Containing Different Proportions of Alternative Materials

Performance Evaluation of Asphalt Mixtures Containing Different Proportions of Alternative Materials

Experimental Analysis of Hot-Mix Asphalt (HMA) Mixtures with Reclaimed Asphalt Pavement (RAP) in Railway Sub-Ballast

Blending of Virgin and RAP Binder for Asphalt Mixes with High RAP Contents: A Pilot Study

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