Impact of warm-mix asphalt technologies and high reclaimed asphalt pavement content on the performance of alternative asphalt mixtures

Zaremotekhases, Farah; Sadek, Husam; Hassan, Marwa; Berryman, Charles

doi:10.1016/j.conbuildmat.2021.126035

Cited by 13 publications

(2 citation statements)

References 32 publications

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“…As the RAP content increased, the J nr3.2 values decreased, indicating enhanced resistance to higher traffic levels (Figure 13). Similar findings were reported by Zaremotekhases et al [67], who demonstrated that samples with RAP, at both testing levels, exhibited lower J nr values than those without RAP, indicating the stiffening effect of RAP binder. According to Yu et al [65], increasing amounts of RAP binder lead to a decrease in the J nr value of WMA-RAP samples with foam asphalt and an increase in the %R value.…”

Section: Permanent Deformation Multi-stress Creep and Recovery (Mscr)...supporting

confidence: 90%

Physical, Rheological, and Permanent Deformation Behaviors of WMA-RAP Asphalt Binders

Bohn,

Thives,

Specht

2023

Sustainability

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With the rapid global expansion of road networks, the asphalt industry faces several environmental challenges, such as material shortages, environmental concerns, escalating material costs, demand for eco-friendly materials, and the implementation of “Net Zero” policies. Given these challenges and recognizing the need to explore new solutions, this research evaluated asphalt binder samples incorporating Warm Mix Asphalt (WMA) and Reclaimed Asphalt Pavement (RAP), or WMA-RAP. The assessment focused on analyzing the physical, rheological, and permanent deformation characteristics of WMA-RAP samples containing 20%, 35%, and 50% recycled pavement. The study utilized a chemical surfactant-type WMA additive, Evotherm® P25. The findings showed that the WMA-RAP combination resulted in increased stiffness ranging from 247% to 380% and a reduced phase angle of 16% to 26% with an increasing RAP content from 20% to 50% at Tref 20 °C and 10 Hz. Furthermore, the penetration decreased from 20% to 47%, and the softening point increased from 7% to 17%. An improvement of 2 PGHs was observed by adding 35% and 50% RAP. Additionally, WMA samples containing up to 50% RAP presented more elevated permanent deformation resistance, supporting traffic levels of 64V or 70H. WMA-RAP binders allow mixture production at lower temperatures—an amount of 30 °C less—conserving energy and decreasing the need for new aggregate materials by incorporating recycled materials, thus minimizing the environmental impact.

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Section: Permanent Deformation Multi-stress Creep and Recovery (Mscr)...supporting

confidence: 90%

Physical, Rheological, and Permanent Deformation Behaviors of WMA-RAP Asphalt Binders

Bohn,

Thives,

Specht

2023

Sustainability

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“…HMA mixture refers to the mixture formed by mixing asphalt heated to about 160 °C and mineral aggregate heated to about 180 °C at high temperature. However, asphalt and mineral aggregate expose many defects at such a high temperature, which are as follows: (i) High-temperature mixing and construction environments aggravate the aging of asphalt and weaken the road performance of asphalt mixture; (ii) Short construction time always results in idle machinery and personnel and a long construction period; (iii) Harmful gas discharges from the mixture during production cause severe environmental pollution and threaten the health of construction personnel; (iv) HMA mixture reaches above 160 °C during mixing, which consumes a lot of energy [ 3 , 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Gradation Design and Parameter Determination of Warm-Mix-Agent-Modified Asphalt Mixture

2022

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In order to make up for inadequacies such as high energy cost in the production process and quantities of waste gas and dust release of hot-mix asphalt (HMA), warm-mix asphalt (WMA) has been developed. In this paper, the preparation process of WMA mixture is simply introduced. According to the experimental approach of asphalt binder and asphalt mixture, EC-120 is preliminarily selected as a follow-up research object after a rheological property test and a viscosity test of five kinds of warm-mix-agent-modified asphalts combined with cost analysis. A target mix proportion of SBS~AC-16 is designed, and then through the orthogonal design of the four parameters of the Marshall test of WMA mixture, such as mixing temperature, warm-mix-agent content, compaction blows, and mixing time, the best Marshall test parameters are obtained. The results show that the best parameters are 145 °C of mixing temperature, 3% of warm-mix-agent content, 75 compaction times, and 90 s of mixing time. This study can provide technical support and reference for the construction of WMA pavement in China.

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Performance Assessment of Warm Open-Graded Mixtures Containing 25% Reclaimed Asphalt for Wearing Course of Heavy-Duty Pavements

D’Angelo,

Cardone,

Gasbarro

et al. 2024

14th International Conference on Asphalt Pavements ISAP2024 Montreal

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Impact of warm-mix asphalt technologies and high reclaimed asphalt pavement content on the performance of alternative asphalt mixtures

Cited by 13 publications

References 32 publications

Physical, Rheological, and Permanent Deformation Behaviors of WMA-RAP Asphalt Binders

Physical, Rheological, and Permanent Deformation Behaviors of WMA-RAP Asphalt Binders

Gradation Design and Parameter Determination of Warm-Mix-Agent-Modified Asphalt Mixture

Performance Assessment of Warm Open-Graded Mixtures Containing 25% Reclaimed Asphalt for Wearing Course of Heavy-Duty Pavements

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