Influence of six rejuvenators on the performance properties of Reclaimed Asphalt Pavement (RAP) binder and 100% recycled asphalt mixtures

Zaumanis, Mārtiņš; Mallick, Rajib B.; Poulikakos, Lily D.; Frank, Robert

doi:10.1016/j.conbuildmat.2014.08.073

Cited by 366 publications

(123 citation statements)

References 25 publications

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“…The bio-derived materials are produced using various raw materials and are combined with a bituminous binder in a wide range of proportions [8][9][10]. As studied earlier [11], such materials may also change the binder and asphalt mixture stiffness, allowing for rejuvenating action.…”

Section: Introductionmentioning

confidence: 99%

Thermal and Fatigue Evaluation of Asphalt Mixtures Containing RAP Treated with a Bio-Agent

et al. 2017

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Environment conservation and diminishing natural resources caused an increase in popularity of the application of renewable bio-origin resources for the construction of road pavement. Currently, there are known additions of bio-origin materials for bitumen modification. Such material is also used as a flux additive for bitumen or as a rejuvenator once working with reclaimed asphalt pavement (RAP). This paper presents research dealing with asphalt mixtures with RAP modified with a bio-agent of rapeseed origin. The main idea of the conducted research was to apply more RAP content directly to the batch mix plant without extra RAP heating. The RAP used in this study was milled from a base asphalt layer; the addition of RAP stiffens new asphalt mixtures. A bio-agent, due to its fluxing action, was used to support the asphalt mixing process and to decrease the over-stiffening of the mixture caused by RAP addition. This research includes bitumen and mixture tests. For the bitumen study, three different bitumens (35/50, 50/70, and 70/100) were tested in a dynamic shear rheometer (DSR) for complex modulus G* and for phase angle |δ| in the temperature range 0-100 • C. The reference mixture and mixtures with 2.5% bio-agent were tested to assess the influence of RAP and the bio-agent addition on the asphalt mixture properties. Low temperature behavior (TSRST), stiffness, and fatigue resistance (4PB) were tested. Based on the bitumen test, it was determined that even a low rate of bio-agent (2.5%) beneficially changes bitumen properties at a low temperature; moreover, polymerization processes occurring in the second stage of the process improves bitumen properties at a high operational temperature. The research with these asphalt mixtures demonstrates that the bio-origin flux acts as a rejuvenator and allows for an application of 30% cold RAP. Thermal cracking resistance of the mixture with RAP and 2.5% bio-agent improved. The bio-agent removes unfavorable stiffening of RAP and increases the fatigue resistance of the asphalt mixture.

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Section: Introductionmentioning

confidence: 99%

Thermal and Fatigue Evaluation of Asphalt Mixtures Containing RAP Treated with a Bio-Agent

et al. 2017

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“…Ji et al indicated in their study that the heavy fuel oils are sensitive to volatilization and at high recycling temperature (over 180°C) disappear from the mixture and accordingly this causes to less RAP materials in total mixture. They suggested that vegetable oils are rich in unsaturated fatty acids and are similar to light oils resist better against volatilization [15]- [17]. Although the results after RTFOT were with the specification limits, the results proved that the rejuvenated binders are more sensitive to short term aging than virgin binder.…”

Section: Binder Test Resultsmentioning

confidence: 52%

“…When it comes to Waste Engine Oil (WEO), what literature survey brings to light is that WEO is also amongst the addressed oily based rejuvenators [15], [16]. Zaumanis et al investigated the performance properties of RAP bitumen and 100% recycled asphalt mixtures with six different rejuvenators.…”

Section: Introductionmentioning

confidence: 99%

“…WEO was employed in order to enhance RAP bitumen within the study. The authors reported improvement in many aspects such as reducing the performance grade of the rejuvenated RAP bitumen to the level of virgin bitumen, passing rutting requirement, enhancing of mixture cracking resistance and an improved workability for rejuvenated mixtures [15].…”

Section: Introductionmentioning

confidence: 99%

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Implementing Waste Oils with Reclaimed Asphalt Pavement

Dokandari¹,

Kaya²,

Şengöz³

et al. 2017

Proceedings of the 2nd World Congress on Civil, Structural, and Environmental Engineering

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-The present asphalt pavement industry faces two major issues. These two major issues are the increasing demand for ecofriendly asphalt mixtures and the costs of raw materials. The use of reclaimed asphalt pavement will be an essential attempt to reduce the costs of aggregates and bitumen in the final mixture. On the other hand, the main challenge for implementing RAP (Reclaimed Asphalt Pavement) is to overcome quality issues. RAP doesn't perform like a fresh pavement since it is an aged material and needs to be improved. This puts forward the requirement for extra practices like using of rejuvenating agents. Since bitumen loses its oily constituents when it ages, the use of oil-containing additives can be effective. In this study, two kinds of waste oils were used to rejuvenate aged asphalt mixture. Optimum contents of Waste Engine Oil (WEO) and Waste Vegetable Oil (WVO) additives were determined in order to implement various RAP contents. The effects of these two oily based rejuvenators on utilization of RAP in bituminous mixtures were investigated. The results represented that the use of WEO and WVO as rejuvenators for mixtures containing RAP enhances the amount of RAP used in bituminous mixtures.

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“…Generally, RAP contents from 10% to 30% by mass of the mixture are considered to be adequate to produce asphalt mixtures with performance similar to conventional mixtures [4][5][6]. Rejuvenators, additives and warm mix asphalt technology are usually employed to improve the effective contribution of RAP binder towards the total binder of the mixture [7][8][9]. However, the use of RAP is at a very low level in many developing countries, for there are no relevant and unified recycling guidelines.…”

Section: Introductionmentioning

confidence: 99%

Methods to Evaluate the Aging Grades of Reclaimed Asphalt Binder

et al. 2017

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Featured Application: The development of aging grades for reclaimed asphalt binder can be used to guide the design of RAP mixtures. Abstract:The use of reclaimed asphalt pavement (RAP) is of great significance for alleviating the problem of resource waste and land space occupation in the context of asphalt pavement. However, the use rate of RAP is still low in many countries because of limited understanding and no unified recycling guidelines, especially in terms of materials classification and aging grades. In this study, reclaimed asphalt pavements from sixteen different sections in southern China were collected, including with base and polymer modified asphalt (PMA). The performance of the reclaimed asphalt binder (RAB) at low, average and high temperatures was tested, using various methods, to find suitable indexes for categorizing aging grades. The viscosity (135 • C) and penetration (25 • C) were found to distinguish the aging degree of RAB the most consistently, and served as the indices to classify the RAB into different grades. To simplify the evaluation of aging grades, a comprehensive service life was determined using the Analytic Hierarchy Process, taking service years and surface levels into account. As a result, a good correlation was found between comprehensive service life and the aging grades.

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Influence of six rejuvenators on the performance properties of Reclaimed Asphalt Pavement (RAP) binder and 100% recycled asphalt mixtures

Cited by 366 publications

References 25 publications

Thermal and Fatigue Evaluation of Asphalt Mixtures Containing RAP Treated with a Bio-Agent

Thermal and Fatigue Evaluation of Asphalt Mixtures Containing RAP Treated with a Bio-Agent

Implementing Waste Oils with Reclaimed Asphalt Pavement

Methods to Evaluate the Aging Grades of Reclaimed Asphalt Binder

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