Effect of rejuvenator and mixing methods on behaviour of warm mix asphalt containing high RAP content

Lu, Dai Xuan; Saleh, Mofreh; Nguyen, Nhu H.T.

doi:10.1016/j.conbuildmat.2018.11.205

Cited by 49 publications

(8 citation statements)

References 17 publications

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“…This study aimed to investigate Warm Mix Asphalt (WMA) technology with Reclaimed Asphalt Pavement (RAP) addition and assess how these materials interact at the asphalt binder level. The economic benefits and sustainability aspects, considering greenhouse gas reduction policies and the rising global average temperature [20][21][22], make these types of materials promising solutions to be widely adopted in the coming years [29][30][31].…”

Section: Discussionmentioning

confidence: 99%

Physical, Rheological, and Permanent Deformation Behaviors of WMA-RAP Asphalt Binders

Bohn,

Thives,

Specht

2023

Sustainability

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With the rapid global expansion of road networks, the asphalt industry faces several environmental challenges, such as material shortages, environmental concerns, escalating material costs, demand for eco-friendly materials, and the implementation of “Net Zero” policies. Given these challenges and recognizing the need to explore new solutions, this research evaluated asphalt binder samples incorporating Warm Mix Asphalt (WMA) and Reclaimed Asphalt Pavement (RAP), or WMA-RAP. The assessment focused on analyzing the physical, rheological, and permanent deformation characteristics of WMA-RAP samples containing 20%, 35%, and 50% recycled pavement. The study utilized a chemical surfactant-type WMA additive, Evotherm® P25. The findings showed that the WMA-RAP combination resulted in increased stiffness ranging from 247% to 380% and a reduced phase angle of 16% to 26% with an increasing RAP content from 20% to 50% at Tref 20 °C and 10 Hz. Furthermore, the penetration decreased from 20% to 47%, and the softening point increased from 7% to 17%. An improvement of 2 PGHs was observed by adding 35% and 50% RAP. Additionally, WMA samples containing up to 50% RAP presented more elevated permanent deformation resistance, supporting traffic levels of 64V or 70H. WMA-RAP binders allow mixture production at lower temperatures—an amount of 30 °C less—conserving energy and decreasing the need for new aggregate materials by incorporating recycled materials, thus minimizing the environmental impact.

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Section: Discussionmentioning

confidence: 99%

Physical, Rheological, and Permanent Deformation Behaviors of WMA-RAP Asphalt Binders

Bohn,

Thives,

Specht

2023

Sustainability

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“…However, as time goes by, under the combined effect of air, sunlight and rain erosion, the performance of aged asphalt will be degraded, and this change is hard to be reversed [1][2][3]. Therefore, scholars in the industry have conducted a lot of experimental researches on aging asphalt pavements and have proposed a variety of asphalt pavement regeneration schemes [4,5]. The use of regenerant to improve the performance index of aging asphalt has also been proposed to restore the technical index of the original asphalt [6].…”

Section: Introductionmentioning

confidence: 99%

The influence of regenerant with different dosages on the performance of aged SBS modified asphalt

Wang¹,

Xu²,

Wu³

et al. 2022

Vib. proced.

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In asphalt pavement thermal regeneration, incorporation of regenerant can restore the properties of aged SBS modified asphalt, but the effect of regenerant on the recovery of aged asphalt and the dosage of regenerant are not clear. In this study, experiments are carried to determine the effect of regenerant on the performance of aged SBS modified asphalt and the appropriate dose. Accelerated aging test is conducted by rolling thin film oven test (RTFOT) at different times. Then, different doses of regenerant (2 %, 4 %, 6 %, 8 %, 10 %, 12 %) are added to the specimens before and after aging, and test its technical indexes such as penetration, softening point and ductility to analyze the effect of regenerant on the properties of aged asphalt. The results show that: with the increase of the amount of regenerating agent, the aging asphalt performance indexes are restored, the softening point of regenerated asphalt is reduced, and the ductility and needle penetration are increased. Based on the analysis of the relationship between the aging time of SBS modified asphalt and the amount of regenerant, interpolation fitting is carried out to obtain the formula for the best amount of regenerant, so as to determine the best regenerant dosage for aged asphalt mixes in actual engineering applications.

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“…Unlike the specimen containing 50 percent of RAP, the specimens containing 25 and 75% RAP were improved in terms of rutting resistance upon adding the RA to the virgin binder. The researchers also stressed the need for more extensive research to investigate this finding [11]. Kaseer et al investigated the effect of the way of adding RAs on the properties of RAP binder.…”

Section: Introductionmentioning

confidence: 99%

Influence of Recycling Agents Addition Methods on Asphalt Mixtures Properties Containing Reclaimed Asphalt Pavement (RAP)

Ziari¹,

Hajiloo²,

Ayar³

2022

Sustainability

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Recycling agents (RAs) are used to restore the physicochemical properties of the aged asphalt binder existing in the reclaimed asphalt pavement (RAP) material. The best location for adding the RAs in the manufacturing process of the asphalt mixtures containing RAP has always been of concern to asphalt mixture researchers. In this study, vegetable, paraffinic and aromatic extract oils were used as RAs. The effect of RA location on the performance properties of the asphalt mixtures containing different percentages of the RAP material was investigated by adding the RAs in three different locations, including in the virgin binder, in the hot RAP material, and in the final mixture. For this aim, the rutting, cracking, and moisture sensitivity of the mixtures containing different RAs at different locations was investigated. The results showed that the best location for adding the RAs is different for various RAs. The best place for adding the paraffinic, aromatic extract, and vegetable oils in terms are in the virgin binder, in the RAP, and the final mixture, respectively. Therefore, using RAs in their appropriate location can improve the mechanical properties of asphalt mixtures containing RAP.

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Effect of rejuvenator and mixing methods on behaviour of warm mix asphalt containing high RAP content

Cited by 49 publications

References 17 publications

Physical, Rheological, and Permanent Deformation Behaviors of WMA-RAP Asphalt Binders

Physical, Rheological, and Permanent Deformation Behaviors of WMA-RAP Asphalt Binders

The influence of regenerant with different dosages on the performance of aged SBS modified asphalt

Influence of Recycling Agents Addition Methods on Asphalt Mixtures Properties Containing Reclaimed Asphalt Pavement (RAP)

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