Adhesion Improvement between RAP and Emulsified Asphalt by Modifying the Surface Characteristics of RAP

Wang, Zhenjun; Wang, Pei; Guo, Haoyan; Wang, Xiaofeng; Li, Gang

doi:10.1155/2020/4545971

Cited by 12 publications

(10 citation statements)

References 27 publications

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“…After years of service, the properties of asphalt binder in the pavement changed [3], and they became more aged. The aging processes of asphalt binders in the RAP deepen with increasing exposed surfacedepending on the size of the RAP particles-and exposure time to the atmosphere [4,5]. Furthermore, RAP storing in the stockpiles increased the RAP binder aging process due to the exposure to air [6,7].…”

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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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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“…The use of RAP or RAS in asphalt mixtures reduces the demand for natural resources, reduces emissions during the production process, and decreases the quantities of materials dumped in landfills [5,6]. Reclaimed asphalt pavement consists of aged asphalt binders and aggregates [7][8][9]. RAS contains oxidized air-blown asphalt binder percentage ranging from 19 to 36% by weight, granules (ceramic-coated or sand-sized natural aggregate) from 20 to 38% by weight, mineral filler/stabilizer (limestone, dolomite, or silica) from 8 to 40%, and fibers (fiberglass or cellulose backing) 2 to 20% by weight [4,10].…”

Section: Introductionmentioning

confidence: 99%

Characterization of asphalt binders extracted from field mixtures containing RAP and/or RAS

Deef-Allah¹,

Abdelrahman²

2022

World J. Adv. Res. Rev.

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The use of reclaimed asphalt pavement (RAP) and/or recycled asphalt shingles (RAS) in the asphalt mixtures is a common practice in the U.S.A. However, there is a controversy to date on how RAP/RAS interact with virgin asphalt binders (VABs) in asphalt mixtures. For mixtures containing RAP/RAS, the aged asphalt binders in RAP and air-blown asphalt binders in RAS alter the performances of the extracted asphalt binders (EABs). Thus, the rheological properties of EABs from these mixtures require more investigation. The focus of this paper was relating the high-temperature properties of EABs from field cores to the corresponding rolling thin film oven aged virgin asphalt binders (RTFO AVABs). Furthermore, a comparison of the effect of RAP and RAS on the high-temperature rheological properties of EABs was another objective. Different asphalt cores were collected from the field within two weeks after the pavement construction process in 2016. These cores represented eight asphalt mixtures with different asphalt binder replacement percentages by RAP, RAS, or both. The asphalt binders were extracted from these mixtures and considered as RTFO AVABs. The high-temperature rheological properties included the temperature sweep and frequency sweep testing and the multiple stress creep recovery testing. The EABs had higher stiffnesses and elasticates than the corresponding RTFO AVABs because of the aged binders in RAP/RAS. The binders in RAP interacted more readily with VABs than RAS binders.

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“…This tendency persisted throughout Superpave's development [1][2][3]. RAP consists of valuable materials, aggregate and asphalt binder (AB) that have been scraped and processed from pavement [3][4][5][6][7][8]. Recycled asphalt shingles (RAS) were utilized in asphaltic mixes in the 1980s [1,2].…”

Section: Introductionmentioning

confidence: 99%

Optimizing Percentages of Asphalt Content Extracted from Mixes Containing RAP and/or RAS

Deef-Allah

Abdelrahman

2021

JERR

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Extracting asphalt binders (ABs) from mixes including recycled asphalt shingles and/or reclaimed asphalt pavement (RAP) needs more investigation. The most popular way for extracting ABs from mixes is centrifuge extraction. The fine materials (dust) extracted with the effluent were quantified using ashing and centrifuge mineral matter determination methods (MMDMs). MMDM could underestimate the extracted asphalt content (EAC)% by overestimating dust amounts. As a result, the actual asphalt content% values were compared to the EAC% values utilizing ashing and centrifuge MMDMs. The EAC% values using the centrifuge MMDM showed more accurate values when compared to the EAC% values using the ashing MMDM. The fabrication techniques used in the field, lab, and plant mixes and the additives used in these mixes altered the interaction processes between virgin asphalt binders (VABs) and RAP binders. More interactions occurred in the plant mixes due to reheating these mixes prior to compaction in the lab. Thus, the EAC% values from plant mixes were higher than the EAC% values from the same mixes obtained from the field. The interactions between the RAP binder and the VAB were boosted by Evoflex that increased the EAC% values.

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Adhesion Improvement between RAP and Emulsified Asphalt by Modifying the Surface Characteristics of RAP

Cited by 12 publications

References 27 publications

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

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

Characterization of asphalt binders extracted from field mixtures containing RAP and/or RAS

Optimizing Percentages of Asphalt Content Extracted from Mixes Containing RAP and/or RAS

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