Relationship between Chemistry and Mechanical Properties of RAP Binder Blends

Mullapudi, Ramya Sri; Deepika, K; Reddy, K. Sudhakar

doi:10.1061/(asce)mt.1943-5533.0002769

Cited by 14 publications

(3 citation statements)

References 19 publications

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“…Ten of the eleven articles reviewed had information about the methodology used to collect the RAP. In 3 investigations, plant recycling was used [20][21][22], and in the remaining 7, the milling technique was used [23][24][25][26][27][28][29].…”

Section: Ways To Collect Characterize and Incorporate Rap In The Prep...mentioning

confidence: 99%

Theoretical analysis of waste cooking oil rejuvenator in reclaimed asphalt for sustainable hot asphalt mix preparation at the Área Metropolitana de Bucaramanga

Peñaloza

Vásquez²,

Valdivieso³

et al. 2022

DYNA

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Reusing reclaimed asphalt pavements (RAPs) provides economic, social, and environmental benefits. To improve the performance of these materials, rejuvenating agents such as waste cooking oil (WCO) have been implemented. The annual amounts of RAP and WCO available in the Área Metropolitana de Bucaramanga (AMB) were calculated to be 32 thousand and 22 thousand tons per year, respectively. Subsequently, international standards were reviewed and compared with Colombian regulations to establish a methodology to determine the appropriate percentage of WCO to add to RAP for hot asphalt mix preparation. The authors suggest investigating WCO levels from 3% to 6% and selecting the percentage that reestablishes the penetration grade (INV-E-706-13), softening point (INV-E-712-13), and viscosity (INV-E-717 -13) of asphalt binder. For hot asphalt mix preparation, the authors propose using the Marshall method and determining the appropriate percentage of asphalt according to stability and flow tests (INV-E-748-13), percent air voids (INV-E-736-13), and bulk density (INV-E-733-13).3).

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Section: Ways To Collect Characterize and Incorporate Rap In The Prep...mentioning

confidence: 99%

Theoretical analysis of waste cooking oil rejuvenator in reclaimed asphalt for sustainable hot asphalt mix preparation at the Área Metropolitana de Bucaramanga

Peñaloza

Vásquez²,

Valdivieso³

et al. 2022

DYNA

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“…In previous studies, efforts have been made to correlate the oxidation products, mainly ketone and sulfoxide, with the mechanical parameters of bitumen, e.g., softening point, viscosity, complex shear modulus, phase angle, etc. [34,35]. This socalled chemo-mechanics correlation will be beneficial to understand the dependence of mechanical properties of binders on their chemical composition.…”

Section: Chemo-mechanics Of Agingmentioning

confidence: 99%

Effect of laboratory aging on chemistry and rheology of crumb rubber modified bitumen

et al. 2020

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Aging during construction and in-service substantially changes the chemical composition and physical properties of bitumen thereof influences the performance of asphalt pavements. The modification of bitumen by crumb rubber modifier (CRM) significantly increases the complexity of the aging mechanism and is expected to improve the aging resistance of bitumen. This study aims to investigate the effects of laboratory short-term and long-term aging on the chemistry and rheology of crumb rubber modified bitumen (CRMB). Neat bitumen and CRMB with four different CRM contents were studied. Fourier transform infrared spectroscopy and dynamic shear rheometer were employed to measure the change in the chemical composition and rheological properties of binders at different aging states. Bitumen hardening, which was rheologically revealed by the frequency sweep and multiple creep recovery test results, was also reflected in the growth of carbonyl and sulfoxide functional groups. In addition, the aliphaticity and aromaticity indices of binders before and after aging were also investigated. CRMB binders showed improved aging resistance compared to neat bitumen as reflected by the decreased carbonyl and sulfoxide indices as well as the lower change in rheological parameters. Higher resistance against aging was achieved when increasing the CRM content. The results also highlight the correlation between chemistry and rheology of bitumen. Among six selected mechanical parameters of binder, the nonrecoverable creep compliance and percent recovery show better correlations with the combined chemical aging index (sum of carbonyl and sulfoxide indices) than the parameters derived from the linear viscoelastic region.

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“…Poulikakos et al [19] proved that increasing the aging process of asphalt binders, led to a higher intensity of the oxidative functional groups. Mullapudi et al [20] mixed different proportions of extracted RAP binders with VABs, and it was found that the oxygenated functional groups' indices-ISO and ICO-increased with increasing RAP binders' percentages. The binder in the RAP contained a high asphaltene fraction [21], thus EABs' maltenes and asphaltenes fractions change based on the interactions between the RAP binder and VAB.…”

Section: Introductionmentioning

confidence: 99%

Interactions between RAP and virgin asphalt binders in field, plant, and lab mixes

Deef-Allah¹,

Abdelrahman²

2022

World J. Adv. Res. Rev.

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Reclaimed asphalt pavement (RAP) has been used in asphalt mixes for several years in the United States. However, the interactions between the RAP binder and the virgin asphalt binder (VAB) need further investigations. Thus, the main objective of this study was to explore the rheological and chemical properties of extracted asphalt binders (EABs) from plant, field, and lab mixes. The plant mixes were collected from behind the paver, reheated to the compaction temperature, and compacted in the lab. The field mixes were collected as cores within two weeks after the end of the construction process. The lab mixes were fabricated in the lab using the same materials used in the plant and field mixes. The mixes contained high asphalt binder replacement percentages by RAP, which were greater than 30%. The EABs were treated as rolling thin film oven aged VABs (RTFO AVABs). The rheological properties of EABs and RTFO AVABs were analyzed using temperature sweep, frequency sweep, and multiple stress creep recovery tests. Chemical investigations of EABs and RTFO AVABs were carried out using Fourier transform infrared spectroscopy and thermogravimetric analysis. The EABs from plant or lab mixes showed higher stiffnesses than EABs from field mixes. This occurred because of the extra heating that was implemented for the plant mixes before the compaction in the lab, which caused more interactions between the RAP binder and VABs. The fabrication mechanism, mixing and short-term aging processes, used in lab mixes caused more interactions between RAP binder and VABs than in the field mixes.

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Relationship between Chemistry and Mechanical Properties of RAP Binder Blends

Cited by 14 publications

References 19 publications

Theoretical analysis of waste cooking oil rejuvenator in reclaimed asphalt for sustainable hot asphalt mix preparation at the Área Metropolitana de Bucaramanga

Theoretical analysis of waste cooking oil rejuvenator in reclaimed asphalt for sustainable hot asphalt mix preparation at the Área Metropolitana de Bucaramanga

Effect of laboratory aging on chemistry and rheology of crumb rubber modified bitumen

Interactions between RAP and virgin asphalt binders in field, plant, and lab mixes

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