Effect of State of Stress on the Resilient Modulus of Base Layer Containing Reclaimed Asphalt Pavement

Attia, Mohamed; Abdelrahman, Magdy

doi:10.1080/14680629.2011.9690353

Cited by 26 publications

(9 citation statements)

References 6 publications

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“…Other studies suggested the use of additives to stabilize the properties of RAP-VA blends or recommended the use of geocells and geosynthetics to provide additional confinement to the base course ( 7, 11, 12 ). However, there are also previous studies where the researchers reported an improvement in the permanent strain of RAP-VA blends compared with the 100% VA ( 13, 14 ). Although these studies did not describe why such improvement was observed, compared with the opposite findings by other researchers.…”

mentioning

confidence: 91%

Optimizing the Gradation of Fine Processed Reclaimed Asphalt Pavement and Aggregate Blends for Unbound Base Courses

Ullah

Tanyu

Hoppe

2018

Transportation Research Record

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The purpose of this research was to investigate the effect of changes in grain size distribution to the permanent deformation of two different fine processed reclaimed asphalt pavement (RAP) blended with base course virgin aggregate (VA). Grain size distribution of the RAP-VA blends were created following two different approaches. The first approach was based on mixing RAP and VA to have one grain size distribution, regardless of how much RAP was added to VA (here referred to as the engineered mixture design). The second approach was based on mixing RAP and VA with as-is gradation from the plants to proportions determined by weight and not controlling the outcome of the specific grain size of the mixture. This approach resulted in various grain size distributions (here referred as the as-is mixture design). The engineered mixture design was useful to quantify the effect of adding RAP to the blends, but was not a realistic approach to create blends that may be achieved in the field. The as-is mixture design could not only be achieved in the field, as demonstrated in this study, but also resulted in better performance in terms of permanent deformation. This manuscript describes the comparison of these two approaches and a methodology to optimize the gradation and develop thresholds for RAP-VA blends that may result in similar or better performance than the 100% as-is VA that is used to construct base course in pavement systems.

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mentioning

confidence: 91%

Optimizing the Gradation of Fine Processed Reclaimed Asphalt Pavement and Aggregate Blends for Unbound Base Courses

Ullah

Tanyu

Hoppe

2018

Transportation Research Record

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“…For this kind of RAP, the OMC was 5.5%, and the MDD was 2,124 kg/m 3 . For Class 5, the OMC was 6.4%, and the MDD was 2,223 kg/m 3 (3).…”

Section: Experimental Considerationsmentioning

confidence: 97%

Modeling of the Resilient Modulus for Recycled Asphalt Pavement Applications in Base Course Layers

Noureldin

Abdelrahman

2013

Transportation Research Record

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The resilient modulus (MR) is an important parameter for the base course layer in the pavement design process. Use of recycled asphalt pavement (RAP) for this layer must take into consideration the effect of various factors that may occur in the field on the MR. Previous numerical models used for the granular base layer could be used for the RAP. The study reported here examined the suitability of RAP procedures under the effect of different factors (e.g., water content, dry density, freeze–thaw cycles). Various percentages of the RAP (50%, 75%, and 100% by weight) were employed in this research. All the models included in the study took into account the effect of state of stresses directly, but they also considered the other factors mentioned and the effect of their interactions with the MR indirectly. The intent of the study was twofold: (a) to determine the adequacy of the models employed in the use of the RAP procedure in the base course layer and (b) to determine which model best described RAP behavior under the effects of the tested factors. On the basis of a review of the literature, nine prediction models were chosen to investigate the granular base course layers so as to predict MR for RAP. A pilot analysis was made of these models to compare the measured and predicted values of MR under the tested factors. Three models showed a good prediction for the MR. These three models were reassessed in a sensitivity analysis on regression parameters to choose the best-fit model for the RAP applications.

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“…Attia and Abdelrahman [19] concluded that the usage of RAP for a base layer material is a sustainable rehabilitation technique and it reduces cost. Appropriate characterization of the stress dependent behavior within the layer of pavement structure may significantly impact the overall accuracy of the predictions of pavement responses.…”

Section: Use Of Rap For Unbound Pavement Layersmentioning

confidence: 99%

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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Effect of State of Stress on the Resilient Modulus of Base Layer Containing Reclaimed Asphalt Pavement

Cited by 26 publications

References 6 publications

Optimizing the Gradation of Fine Processed Reclaimed Asphalt Pavement and Aggregate Blends for Unbound Base Courses

Optimizing the Gradation of Fine Processed Reclaimed Asphalt Pavement and Aggregate Blends for Unbound Base Courses

Modeling of the Resilient Modulus for Recycled Asphalt Pavement Applications in Base Course Layers

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

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