Investigating Resilient Modulus Interdependence to Moisture for Reclaimed Asphalt Pavement Aggregates

Cliatt, Brad; Plati, Christina; Loizos, Andreas

doi:10.1016/j.proeng.2016.06.031

Cited by 6 publications

(3 citation statements)

References 4 publications

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“…The permanent deformation, however, of the RAP material was in general higher than that of the crushed aggregates. More recent research by Cliatt et al [14] also concluded that investigated RAP aggregate materials had M r values that are equal to or are in excess of virgin aggregates.…”

Section: Use Of Rap For Unbound Pavement Layersmentioning

confidence: 95%

A Sustainability Perspective for Unbound Reclaimed Asphalt Pavement (RAP) as a Pavement Base Material

Plati

Cliatt

2018

Sustainability

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The present study aims to investigate reclaimed asphalt pavement (RAP) materials for utilization for a pavement base layer material with the goal towards increasing the reutilization of materials and the movement towards increased pavement sustainability. Reduced cost for materials and transportation of materials, overall environmental benefits and many other advantages have led to increased interests in utilizing RAP in pavements including as base materials for highway/roadway construction projects. The potential advantages of utilizing RAP as an unbound base material are known; however, its overall application is still limited partially due to the lack of systematic evaluation studies for the parameterization of RAPs mechanical behavior in pavement design. With this in mind, the current investigation focuses on the resilient modulus (Mr) properties of RAP aggregates in terms of a material’s elastic response. Experimental data from tri-axial stress tests on specimens consisting of RAP, aggregates and a mixture of both materials are investigated. A number of constitutive models for the description of mechanical behavior of RAP materials are investigated. The required procedures for determining the constitutive constants of the constitutive models is outlined for the aforementioned materials. A comparative analysis is applied, and the related results are evaluated. The main conclusion is that RAP materials can be utilized as a base material in the framework of pavement sustainability, as its behavior under loading conditions are similar to virgin aggregate (VA) materials and can be simulated by using appropriate constitutive models for pavement design processes.

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Section: Use Of Rap For Unbound Pavement Layersmentioning

confidence: 95%

A Sustainability Perspective for Unbound Reclaimed Asphalt Pavement (RAP) as a Pavement Base Material

Plati

Cliatt

2018

Sustainability

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“…Plati and Cliati [ 51 ] reported that 100% RAP material and 50% RAP/50% virgin aggregate (VA) material produced M R results similar to those investigated for VA, particularly at increased compaction pressures. Others systematically agree that RAP addition to VA (i) reduces dry density [ 52 ], (ii) reduces bearing capacity (as measured by the California Bearing Ratio) [ 52 ], and (iii) increases the modulus of elasticity [ 47 , 53 , 54 , 55 ]. However, the question usually arises as to how to utilize the high RAP amount in the base layer without diminishing the mechanical properties.…”

Section: Brief Overview On the Application Rap In Different Asphalt P...mentioning

confidence: 99%

“…Despite the current efforts in ACP recycling, the quantity of RAP produced has not been fully utilized, and as a result, more innovative recycling alternatives are required. Already, there are claims that 100% RAP can be successfully used in the pavement asphalt layers [ 11 ], and that RAP usage can be extended even to the pavement foundation layers [ 47 , 51 , 53 , 54 , 55 ]. For the latter, stabilization of the granular materials using techniques including mechanical, chemical, and cementitious binders can allow for more RAP usage.…”

Section: Reflections From the Literature Review And Perspectives For ...mentioning

confidence: 99%

Maximizing the Application of RAP in Asphalt Concrete Pavements and Its Long-Term Performance: A Review

et al. 2022

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The use of recycled asphalt pavement (RAP) materials in asphalt concrete pavements (ACP) brings significant cost and environmental benefits. In practice, however, the amount of RAP readily available far exceeds the amount being utilized in ACPs, which still leaves the problem of excess RAP in the environment partially solved. Additionally, ACPs containing RAP materials (i.e., RAP-ACPs) can still be landfilled after they have reached the end of their useful life, which may restore the original environmental waste problem. To address these, researchers have demonstrated different ways to maximize the application of RAP in ACPs. Among them, the use of RAP in pavement preventive maintenance (PPM) treatments and the repeated recycling of RAP-ACPs (i.e., RnAP) are specifically discussed in this review. It is envisaged that, by promoting these two practices, the application and benefits of RAP can be further maximized to improve sustainability. This review also discusses the long-term behavior of RAP-ACP, which is crucial to inspire confidence in the wider application of RAP in ACP. Studies on RAP-PPM have shown that virgin PPM treatments can successfully accommodate RAP materials by adjusting their mix design. So far, research on RnAP has been limited to how multiple-recycling affects the performance properties of the blends, showing improvements in rutting resistance and moisture susceptibility but little effect on linear viscoelasticity and cracking. Overall, the lack of sufficient research is considered to be the biggest challenge in facilitating the implementation of these two sustainable RAP technologies. Little or nothing is known about the bonding mechanisms between RAP and fresh PPM binders, the molecular and chemical changes in RnAP binders, or the functional performance characteristics, actual pavement performance, and long-term performance of both RAP-PPM and RnAP blends. An understanding of these aspects is very relevant to maximize and continue the beneficial reuse of RAP in ACPs while safeguarding human and environmental health.

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Finite Element Simulations of Recycled Asphalt Pavement (RAP) Materials to Be Utilized in Unbound Pavement Layers

Loizos

Cliatt²,

Plati³

2021

Lecture Notes in Civil Engineering

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Investigating Resilient Modulus Interdependence to Moisture for Reclaimed Asphalt Pavement Aggregates

Cited by 6 publications

References 4 publications

A Sustainability Perspective for Unbound Reclaimed Asphalt Pavement (RAP) as a Pavement Base Material

A Sustainability Perspective for Unbound Reclaimed Asphalt Pavement (RAP) as a Pavement Base Material

Maximizing the Application of RAP in Asphalt Concrete Pavements and Its Long-Term Performance: A Review

Finite Element Simulations of Recycled Asphalt Pavement (RAP) Materials to Be Utilized in Unbound Pavement Layers

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