scholarly journals Assessment of Eco-Friendly Pavement Construction and Maintenance Using Multi-Recycled RAP Mixtures

Recycling ◽  
2020 ◽  
Vol 5 (3) ◽  
pp. 17
Author(s):  
David Vandewalle ◽  
Vítor Antunes ◽  
José Neves ◽  
Ana Cristina Freire
Keyword(s):  
Pavement Management ◽  
Reclaimed Asphalt Pavement ◽  
Reclaimed Asphalt ◽  
Sustainable Solutions ◽  
Average Decrease ◽  
Bituminous Mixtures ◽  
Road Pavement ◽  
Pavement Construction ◽  
The Impact ◽  
Lca Results

The demand for more sustainable solutions has led an ever-growing number of stakeholders to being committed to pursue the principles of sustainability in pavement management. Different stakeholders have been looking for tools and methodologies to evaluate the environmental impacts of the solutions, for which the life cycle assessment (LCA) proved to be an appropriate methodology. This paper is focused on the LCA of road pavement multi-recycling based on the use of bituminous mixtures with high rates of reclaimed asphalt pavement (RAP). In order to promote the circular economy, a comparative analysis was performed on a road pavement section by taking into account different scenarios, which stem from the combination of production, construction and rehabilitation activities incorporating different RAP rates in new bituminous mixtures: 0% (as reference), 25%, 50%, 75% and 100%, respectively. LCA results have been expressed in terms of four damage categories: human health, ecosystem quality, climate change and resources. Results have shown that both recycled and multi-recycled bituminous mixtures lead to substantial benefits in comparison with the solution employing virgin materials, hence embodying a sustainable approach. The benefits grow with the increase in the RAP rate with an average decrease of 19%, 23%, 31% and 33% in all the impact categories for a 25%, 50%, 75% and 100% of RAP rate.

scholarly journals Performance Assessment of Reclaimed Asphalt Pavement (RAP) in Road Surface Mixtures

Recycling ◽  
2021 ◽  
Vol 6 (2) ◽  
pp. 32
Author(s):  
Vítor Antunes ◽  
José Neves ◽  
Ana Cristina Freire
Keyword(s):  
Current Knowledge ◽  
Asphalt Pavement ◽  
Permanent Deformation ◽  
Reclaimed Asphalt Pavement ◽  
Reclaimed Asphalt ◽  
Bituminous Mixtures ◽  
Road Pavement ◽  
Water Sensitivity ◽  
Short And Long Term

Considerable amounts of Reclaimed Asphalt Pavement (RAP) are produced every year, as the road network requires maintenance to ensure the safety and comfort of its users. RAP is a 100% recyclable material and a useful fit to be re-introduced into another cycle without downgrading its functionality. Despite the current knowledge about the benefits associated with RAP use, it is not yet largely applied in several countries. This paper aims to validate, on the basis of both short- and long-term mechanical behaviours, the application of a bituminous mixture with a high RAP incorporation rate (75%) in road pavement wearing courses. A crude tall oil rejuvenator was used. Both short- and long-term oven ageing procedures were employed to simulate the ageing that occurs during mixture production and in-service life, respectively. The tests for validating the RAP mixture as an alternative solution comprised stiffness, resistance to fatigue, permanent deformation, and determination of the water sensitivity. Furthermore, the RAP bitumen mobilisation degree was evaluated and a mixing protocol was established. In comparison with virgin bituminous mixtures, it was found that, in general, the high RAP mixtures presented similar or better behaviour. The ageing process had a hardening effect namely in terms of stiffness and resistance to permanent deformation, without significant effects on the resistance to fatigue and water damage.

Effect of Partial Blending on High Content Reclaimed Asphalt Pavement (RAP) Mix Design and Mixture Properties

2018 ◽  
Vol 2672 (28) ◽  
pp. 79-87 ◽  
Author(s):  
Shuai Yu ◽  
Shihui Shen ◽  
Xuli Zhou ◽  
Xinghai Li
Keyword(s):  
Design Method ◽  
Asphalt Pavement ◽  
Binder Content ◽  
Reclaimed Asphalt Pavement ◽  
Reclaimed Asphalt ◽  
Blending Method ◽  
Cracking Performance ◽  
Pavement Construction ◽  
Wheel Tracking ◽  
The Impact

Reclaimed Asphalt Pavement (RAP) material, especially high RAP content mixture, is nowadays receiving more interest in asphalt pavement construction. When determining the optimum asphalt content (OAC) in RAP mixture design, RAP partial blending is sometimes neglected and total blending is assumed. Such an assumption influences the virgin binder content determination and can contribute to the poor fatigue and cracking performance of high RAP pavement in the field. This paper studied the impact of RAP partial blending on the OAC of mixtures with varied RAP content up to 40%. A Laboratory Hamburg Wheel Tracking Test, an IDT fracture test, and an SCB test were performed on mixtures designed by different methods to evaluate rutting and cracking performance. In particular, a partial blending design method was proposed to improve the mixture performance by adjusting the virgin binder content through the RAP blending ratio. It was found that the optimum virgin binder content decreased as the RAP content increased; the Superpave volumetric method required the lowest OAC while the partial blending method required the highest OAC. The rutting performance of the RAP mixtures considering partial blending was slightly lower than other mixtures. However, all RAP mixtures showed better rutting resistance than virgin mixtures. The cracking performance of the high RAP mixtures was significantly improved if the partial blending effect was considered in the design.

Characterization of binder and mix properties to detect reclaimed asphalt pavement content in bituminous mixtures

2007 ◽  
Vol 34 (5) ◽  
pp. 581-588 ◽  
Author(s):  
J S Chen ◽  
P Y Chu ◽  
Y Y Lin ◽  
K Y Lin
Keyword(s):  
Energy Loss ◽  
Asphalt Pavement ◽  
Testing Procedure ◽  
Relative Energy ◽  
Engineering Properties ◽  
Reclaimed Asphalt Pavement ◽  
Recycled Asphalt ◽  
Reclaimed Asphalt ◽  
Bituminous Mixtures ◽  
Noticeable Increase

Abstract: The purpose of this study was to recommend a testing procedure to detect the content of reclaimed asphalt pavement (RAP) used in hot-mix asphalt mixtures. Asphalt was extracted from RAP for use in blending with new binder and aggregate. The recovered binders were blended with virgin asphalt (AC-10) at 10 different concentrations. A concept called relative energy loss was proposed to determine the engineering properties of recycled asphalt concrete (RAC). The relative energy loss was found to be directly related to the resistance of RAC to moisture-induced damage. A noticeable increase in relative energy loss with as much as 50% RAP was observed. At 20% RAP, there was not enough RAP to change binder or mixture properties. The predicted performance of mixtures containing up to 40% RAP by weight was shown to be similar to that of virgin material mixtures. A model was developed to estimate the RAP content in terms of penetration, viscosity, and relative energy loss. Key words: reclaimed asphalt pavement, relative energy loss, moisture sensitivity.

scholarly journals The Influence of Reclaimed Asphalt Pavement on the Mechanical Performance of Bituminous Mixtures. An Analysis at the Mortar Scale

2020 ◽  
Vol 12 (20) ◽  
pp. 8343
Author(s):  
Ana E. Hidalgo ◽  
Fernando Moreno-Navarro ◽  
Raúl Tauste ◽  
M. Carmen Rubio-Gámez
Keyword(s):  
Mechanical Performance ◽  
Asphalt Pavement ◽  
Mechanical Analysis ◽  
Elastic Response ◽  
Reclaimed Asphalt Pavement ◽  
Reclaimed Asphalt ◽  
Bituminous Mixtures ◽  
Water Sensitivity ◽  
Term Performance

The main characteristics of bituminous mixtures manufactured with a considerable amount of reclaimed asphalt pavement (RAP), compared to conventional mixtures, are a reduction in workability, an increase in stiffness, and a loss of ductility, due to the presence of the aged bitumen contained in the RAP particles. To minimize these impacts, softer binders or rejuvenators are commonly used in the design of these mixtures in order to restore part of the ductility lost and to reduce the stiffness. In spite of previous investigations demonstrating that the mortar plays an essential role in the workability, long-term performance, and durability of bituminous mixtures (where cracking, cohesion, and adhesion problems all start at this scale), not many studies have assessed the impacts caused by the presence of RAP. In response to this, the present paper analyzes the workability, fatigue performance, and water sensitivity of bituminous mortars containing different amounts of RAP (from 0% to 100%) and rejuvenators. Mortar specimens were compacted using a gyratory compactor and studied via dynamic mechanical analysis under three point bending configuration. The results demonstrated that the presence of RAP reduces the workability and ductility of asphalt mortars. However, it also causes an increase in their stiffness, which induces a more elastic response and causes an increase in their resistance to fatigue, which could compensate for the loss of ductility. This aspect, together with the low water sensitivity shown, when using Portland cement as an active filler, would make it possible to produce asphalt materials with high RAP contents with a similar long-term mechanical performance as traditional ones. In addition, the use of rejuvenators was demonstrated to effectively correct the negative workability and ductility impacts caused by using RAP, without affecting the fatigue resistance and material adhesion/cohesion.

scholarly journals Characterization of Reclaimed Asphalt Pavement (RAP) as a road pavement material (National Road Waru, Sidoarjo)

2018 ◽  
Vol 181 ◽  
pp. 05001
Author(s):  
Ari Widayanti ◽  
A. A. Soemitro Ria ◽  
Januarti Jaya Ekaputri ◽  
Hitapria Suprayitno
Keyword(s):  
Asphalt Pavement ◽  
Microstructural Analysis ◽  
Aluminum Silicate ◽  
Reclaimed Asphalt Pavement ◽  
Reclaimed Asphalt ◽  
Road Pavement ◽  
Sodium Aluminum Silicate ◽  
Object Of Study ◽  
National Road ◽  
Pavement Material

Reclaimed Asphalt Pavement (RAP) is a dredging pavement material using Cold Milling Machine. The application of Reclaimed Asphalt Pavement is increased year by year. Due to the increasing application of RAP year by year which implicates environment condition, especially in damaging natural resources, the research on material used in RAP needs to be conducted, so RAP can be optimally utilized. To achieve optimal performance, data of RAP characteristics reviewed from microstructural analysis is necessary. The objective of this research is to obtain the characteristics of Reclaimed Asphalt Pavement. The method used was literary study based on previous research. Material tests used were XRF, SEM and FTIR. The object of study was RAP material taken from national road Waru Sidoarjo. The major compositions of Reclaimed Asphalt Pavement obtained were Kaolin, Lithium, Tetraborate, Dextrin. SEM graphics showed the morphological and surface texture of RAP. FTIR graphic presented the functional group of Reclaimed Asphalt Pavement showing O-H C-O acid in the peak of graphic. From XRD result, the major compounds of Reclaimed Asphalt Pavement obtained were Calcium, Sodium, Aluminum, Silicate.

scholarly journals Laboratory characterization of reclaimed asphalt pavement for road construction in Egypt

2017 ◽  
Vol 44 (6) ◽  
pp. 417-425 ◽  
Author(s):  
E. Mousa ◽  
A. Azam ◽  
M. El-Shabrawy ◽  
S.M. El-Badawy
Keyword(s):  
Resilient Modulus ◽  
Asphalt Pavement ◽  
Road Construction ◽  
California Bearing Ratio ◽  
Base Layer ◽  
Coefficient Of Determination ◽  
Reclaimed Asphalt Pavement ◽  
Reclaimed Asphalt ◽  
Load Duration ◽  
The Impact

This paper presents the engineering characteristics of reclaimed asphalt pavement (RAP), blended with virgin aggregate for unbound base and subbase layers. The proportions of RAP were 0%, 20%, 60%, 80%, and 100% by total mass of the blend. The experimental laboratory testing included index properties such as gradation, modified Proctor compaction, California Bearing Ratio, and hydraulic conductivity. Repeated load resilient modulus testing was conducted on the blends. The impact of load duration on resilient modulus was also investigated. A strong inverse trend was found between resilient modulus and California Bearing Ratio. An accurate model was proposed for the prediction of the resilient modulus as a function of stress state and reclaimed asphalt pavement percentage with coefficient of determination of 0.94. Finally, multilayer elastic analysis of typical pavement sections with the base layer constructed of virgin aggregate and reclaimed asphalt pavement blends showed good performance.

Sign in / Sign up

Export Citation Format

Share Document