Performance Evaluation of Asphalt Mixtures with High Recycled Asphalt Pavement Content

Loría, Luis; Hajj, Elie Y.; Sebaaly, Peter E.; Barton, Matt; Kass, S; Liske, T

doi:10.3141/2208-10

“…e increase in E * was noticeably higher in the mix containing 30% RAP than that of the control mix (0% RAP). Similar observations were made by Loria et al [13] in their corresponding study, which evaluated the E * of HMA mixes containing 15% and 50% RAP. Other researchers (e.g., [14,15]) also reported an increased E * with an increase in RAP content in the respective studies.…”

Section: Introductionsupporting

confidence: 87%

Prediction of Dynamic Modulus of Hot Mix Asphalts with Reclaimed Asphalt Pavement

Hossain

¹

,

Zaman

²

2020

Advances in Civil Engineering

2

0

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This study evaluated the viscoelastic properties of a performance grade (PG) binder blended with different percentages of binders recovered from reclaimed asphalt pavement (RAP) for conditions (materials, climate, and specifications) prevailing in Oklahoma. The viscoelastic properties of the blended binders were then used to estimate dynamic modulus ( E ∗ ) values of the new mixes with RAP by using the Witczak model through time-temperature superposition (TTS) principles. The recovered binder from RAP was found to be significantly stiffer than the virgin binder (PG 64-22). The addition of RAP increased the complex modulus ( G ∗ ) of the base binder, so did the E ∗ of the corresponding mix. The creep stiffness resistance of the asphalt binder at low service temperatures decreased with the addition of RAP. With up to 10% RAP binder, no notable changes were observed in the viscosity and PG grade of the virgin binder. With 25% and 40% RAP binder, the PGs of the blended binders were found to be PG 70-16 and PG 76-16, respectively. It was observed that the E ∗ master curves predicted from PGs of the blended binders were in close agreement with those estimated from the laboratory-measured E ∗ data. The dynamic shear rheometer (DSR) data of rotational thin film oven (RTFO)-aged blended binders predicted significantly lower E ∗ values compared to the measured ones. The E ∗ values predicted from rotational viscosity (RV) test data were found to be higher than the measured E ∗ values. The findings of this study are expected to provide transportation professionals with a better understanding of new mixes with high RAPs.

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“…There have been extensive research projects on the use and environmental benefits of this material in asphalt paving (Federal Highway Administration [FHWA] 1993, Bukowski 1997, McDaniel and Anderson 2000, Copeland 2011). Likewise there have been many studies, which evaluate the performance of RAP-modified asphalt concrete mixtures (Huang et al 2004, Shah et al 2007, Hou et al 2010, Apeagyei et al 2011, Loria et al 2011, Li and Gibson 2013. This reference list is by no means limited as dozens or more studies exist, but they do convey some generally consistent findings;…”

Section: Introductionmentioning

confidence: 93%

Evaluation ofin situRAP binder interaction in asphalt mastics using micromechanical models

Gundla

¹

,

Underwood

²

2015

International Journal of Pavement Engineering

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In this article the mastic level structure of asphalt concrete containing reclaimed asphalt pavement (RAP) materials is investigated using the principles of micromechanics. Locally sourced RAP material was screened and sieved to separate the coated fines (smaller than 0.075 mm) from the remaining sizes. These binder coated fines were mixed with virgin filler at proportions commensurate with 0, 10, 30, 50 and 100% RAP dosage levels. Asphalt mastics were prepared with these blended fillers and a PG 64-22 binder at a filler content of 27% by volume. Temperature-frequency sweeps were conducted on the resulting composites as well as the constituents, virgin binder, solvent extracted RAP binder. The results from the experiments showed an expected increase in stiffness with increase in dosage levels. These results were also used to model the hypothesised structure of the composite. The study presented discusses the applicability of Herve and Zaoui model to predict the blended mastic composite and to quantify the amount of blending between RAP binder and newly added asphalt binder. It is found that as the RAP dosage level increases the amount of blending that occurs, as a proportion of the total RAP binder decreases.

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“…Great progress has been made in the research of recycled asphalt mixture with a high content of RAP, mainly focusing on the improvement of processing technology, the addition of rejuvenating agents and the assessment of mechanical performance [ 16 , 17 , 18 , 19 , 20 , 21 ]. It is practicable to apply 50% or even more RAP under an optimal condition to meet the requirement of the long-term performance of asphalt pavement in spite of more rutting and crack diseases occurring [ 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Environmental Impact on VOCs Emission of a Recycled Asphalt Mixture with a High Percentage of RAP

Wei

¹

,

Wu

²

,

Zhu

³

et al. 2021

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Recycling of reclaimed asphalt pavement (RAP) has gradually emerged as a hot topic in the current research of building materials. Manufacturing the recycled asphalt mixture with a high RAP content still remains a major challenge due to the problem of inferior water damage resistance and fatigue cracking resistance. The aim of this study is to evaluate the servicing performance of recycled asphalt mixture with high percentage of RAP and assess its environmental impact on volatile organic compounds (VOCs) emission. To further explore the intrinsic factor on the performance of a recycled asphalt mixture, the mixed asphalt binder with a different content of extracted RAP binder was firstly investigated. The results show that the larger the content of RAP binder, the lower the mechanical indexes and VOCs emission. There exists an internal relationship between the chemical composition and VOCs release behavior with the variation of the recycled asphalt binder content. Based on the results of mixed recycled asphalt binder, the road servicing performance of a rather high utilization of RAP (i.e., 50%, 60%, and 70%) was assessed. It was found that the reuse of RAP aggregates has little influence on the volume performance of recycled asphalt mixture, and servicing performances still meet the construction requirements in spite of a descending trend. Moreover, a significant reduction effect on VOCs emission was found in the mixing stage of recycled asphalt mixture, indicating that the VOCs emission can be decreased by 94.82% when the content of RAP aggregates increases to 70%. The recycling of RAP with a high content contributes to the sustainable development of road engineering and the construction of green pavements.

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Performance Evaluation of Asphalt Mixtures with High Recycled Asphalt Pavement Content

Cited by 30 publications

References 0 publications

Prediction of Dynamic Modulus of Hot Mix Asphalts with Reclaimed Asphalt Pavement

Prediction of Dynamic Modulus of Hot Mix Asphalts with Reclaimed Asphalt Pavement

Evaluation ofin situRAP binder interaction in asphalt mastics using micromechanical models

Environmental Impact on VOCs Emission of a Recycled Asphalt Mixture with a High Percentage of RAP

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