How to reduce reclaimed asphalt variability: A full-scale study

Zaumanis, Mārtiņš; Oga, Janis; Haritonovs, Viktors

doi:10.1016/j.conbuildmat.2018.08.137

Cited by 47 publications

(17 citation statements)

References 5 publications

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“…The key problem that recycling introduces is variability [17]. With both in situ and ex situ recycling, variability in the source material, i.e., the existing road, is unavoidable.…”

Section: In Situ and Ex Situ Recyclingmentioning

confidence: 99%

Sustainable Road Design: Promoting Recycling and Non-Conventional Materials

Thom

Dawson

2019

Sustainability

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Many factors impact on the sustainability of road maintenance, including the organization of road authorities, contract forms used, financing structure and, unfortunately, political interference and corruption. However, this paper reviews the opportunities to increase sustainability by utilizing less environmentally damaging material sources, and also the associated challenges. It is a field that has seen advances in recent decades, for example in the effectiveness of cold-mix asphalt binders. Nevertheless, the opportunities are not being taken up in many countries, and this reflects uncertainty in predicting performance. This paper reviews the different design methods available, developed in both temperate and tropical climates, and highlights the lack of agreement with regard to non-conventional materials. The different sources of uncertainty and risk are then discussed, together with ways of limiting them. It is found that, while advances in performance prediction are highly desirable, the key to encouraging recycling and the use of inexpensive but non-conventional materials lies in development of the right contractual arrangements, specifically partnering and risk/reward sharing. The paper concludes with a discussion on approaches to partnering in the construction industry and the prerequisite climate of trust without which innovation is almost inevitably stifled.

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“…The key problem that recycling introduces is variability [17]. With both in situ and ex situ recycling, variability in the source material, i.e., the existing road, is unavoidable.…”

Section: In Situ and Ex Situ Recyclingmentioning

confidence: 99%

Sustainable Road Design: Promoting Recycling and Non-Conventional Materials

Thom

Dawson

2019

Sustainability

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“…As a consequence high RAP mixtures may be prone to cracking (Song et al, 2018;West et al, 2011;You and Goh, 2008) and part of the RAP binder is likely not blending with the introduced virgin materials leading to "black rock" effect (Bowers et al, 2014;Kriz et al, 2014;Sreeram et al, 2018). Another problem is the often insufficient homogeneity of RAP which does not allow to have confidence in continuity of the developed mixture design (Valdés et al, 2011;West, 2008;Zaumanis et al, 2018a).…”

Section: Introductionmentioning

confidence: 99%

Performance-based design of 100% recycled hot-mix asphalt and validation using traffic load simulator

Zaumanis

Arraigada

Wyss

et al. 2019

Journal of Cleaner Production

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This paper reports a comprehensive study on application of performance-based design method 11 for design of 100% recycled asphalt wearing course mixture and demonstrates the performance 12 of the optimum composition from mechanical, traffic safety and environmental points of view. 13The mixture was designed by balancing rutting using French rut tester and cracking using semi-14 circular bend test. Five iterations of different grading and binder content combinations of 100% 15 RAP mixture were tested before achieving the same performance as a traditional AC8 mixture. This optimum mixture design was then validated by producing asphalt slabs for testing in Model Mobile Load Simulator (MMLS3). The digital image correlation results of the wheel loading demonstrated that performance-optimized 100% recycled asphalt can sustain 2.5 times more load applications compared to the traditional mixture before cracking. This wearing course recycled asphalt mixture was then tested for skid resistance and particle abrasion due to rolling tires and achieved similar results to the reference mixture. The research allows concluding that the proposed mixture design approach can be successfully applied for designing 100% recycled asphalt mixtures that perform similar or better than traditional wearing course asphalt mixtures in all key domains and are safe to the traffic and the environment.

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“…For instance, the Spanish Ministry of Public Works, through circular order (OC 40/2017: Recycling of Pavements), restricts the maximum allowable RAP content for hot in-plant recycling (HIR) of bituminous mixtures for its use in binder and wearing course asphalt mixtures and low traffic categories [32]. The likely explanation lies in the constant uncertainty regarding long-term mechanical performance, a good understanding of the blending and interaction process between aged RAP binder and virgin binder [33,34], variability of RAP properties obtained from different sources [35], and that the use of RAP may lead to a lower durability, increased stiffness, and early fatigue cracking pavement failures.…”

Section: Introductionmentioning

confidence: 99%

Laboratory Compaction Study and Mechanical Performance Assessment of Half-Warm Mix Recycled Asphalt Mixtures Containing 100% RAP

Marcobal¹,

Lizárraga

Gallego

2019

Materials

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The use of low-carbon and energy-efficient paving technologies is gaining worldwide acceptance in recent years as a means to encourage commitment towards more sustainable pavement management practices. However, there still remain some technical gaps regarding mix design procedures for the half-warm mix asphalt (HWMA) mixtures’ preparation and characterization in the laboratory. To this end, three different laboratory compaction methods (e.g., static load, Marshall impactor, and gyratory compactor) were selected and put into assessment to define the most suitable compaction test method for half-warm mix recycled asphalt (HWMRA) mixtures with 100% reclaimed asphalt pavement (RAP). Posteriorly, the effect of four-accelerated curing treatments (0, 24, 48, and 72 h) on the mixtures’ mechanical performance was investigated. Then, advanced mechanical characterization of the mixture performance was conducted to quantify the indirect tensile strength (ITS), stiffness modulus, rutting, and four-point bending (4PB) fatigue test. Thus, based on the authors’ findings, the HWMRA mixtures with 100% RAP and emulsified bitumen exhibited proper volumetric (e.g., air voids and density) and mechanical behavior in terms of moisture damage, ITS, stiffness modulus, rutting, and fatigue cracking. These findings encourage greater confidence in promoting the use of these sustainable asphalt mixes for their use in road pavements or urban streets.

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How to reduce reclaimed asphalt variability: A full-scale study

Cited by 47 publications

References 5 publications

Sustainable Road Design: Promoting Recycling and Non-Conventional Materials

Sustainable Road Design: Promoting Recycling and Non-Conventional Materials

Performance-based design of 100% recycled hot-mix asphalt and validation using traffic load simulator

Laboratory Compaction Study and Mechanical Performance Assessment of Half-Warm Mix Recycled Asphalt Mixtures Containing 100% RAP

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