Study on the blending behavior of asphalt binder in mixing process of hot recycling

Wang, Teng; Jian, Wei; Xiao, Jingjing; Guo, Dadong; Yuan, Dongdong; Wu, Wangjie; Wang, Wentong

doi:10.1016/j.cscm.2022.e01477

Cited by 10 publications

(8 citation statements)

References 34 publications

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“…The experimental conditions are outlined in Table 6. The conditions for the optimal fusion mixing process are based on conclusions from the literature [31]. Note: In Order 1, the mixing order is RAP, virgin asphalt, and aggregates.…”

Section: Blending Degree Testmentioning

confidence: 99%

“…(2) Experimental Procedure This study employs the method described in a referenced study [31] to determine the DOB in the three mixing conditions. The correlation between the DOB and the performance of the mixture is also validated.…”

Section: Blending Degree Testmentioning

confidence: 99%

“…Various techniques such as Fourier Transform Infrared Spectroscopy (FTIR), Gel Permeation Chromatography (GPC), Atomic Force Microscopy (AFM), and other analytical tools are being utilized [13][14][15]. Additionally, molecular dynamics and other methods are employed Regarding hot recycled asphalt mixtures, the composition design methods used in most countries were similar to those employed for conventional asphalt mixtures [31][32][33]. Commonly used methods include the Marshall design method, the Superpave design method, and the Asphalt Institute (AI) design method [34][35][36].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Blending Behavior on the Performance of Hot Recycled Asphalt Mixtures

Wang,

Ling,

Lin

et al. 2023

Sustainability

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Blending behavior is the main factor influencing hot recycled asphalt mixtures’ actual and design performance. The following steps were taken to investigate the above issues. Firstly, the component changes of asphalt mixtures were studied by thin-layer chromatography, with flame ionization detection to obtain the mechanism of asphalt aging and recycling. Secondly, according to the difference in the recycled asphalt components, the hot recycled asphalt mixtures were optimized based on the Marshall design method. Lastly, the hot recycled asphalt mixtures for the three mixing processes were prepared using the optimized design method described above. Laboratory tests were conducted to evaluate the correlation between the degree of blending (DoB) and the high-temperature stability, low-temperature crack resistance, water stability, and fatigue performance. The test results indicate that reducing light components (saturates and aromatics) and increasing heavy components (asphaltenes and resins) are the main reasons for asphalt aging, and asphalt recycling is an inverse process. Additionally, the performance of hot recycled asphalt mixtures is improved with an increase in DoB. Specifically, the DoB is only 50% to 60% under a normal mixing process, but by adjusting parameters the DoB will increase to 80% to 90%.

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Section: Blending Degree Testmentioning

confidence: 99%

Section: Blending Degree Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Blending Behavior on the Performance of Hot Recycled Asphalt Mixtures

Wang,

Ling,

Lin

et al. 2023

Sustainability

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“…Addressing methods to reduce winter pavement icing has become a focal point of interest among numerous scholars [5,6]. Currently, pavement snow removal methods primarily involve manual snow removal [7], mechanical snow removal [8,9], and the application of deicing salt [10]. However, these methods all, to varying degrees, consume traffic resources and suffer from delayed deicing effects [11], thereby failing to address icy road surfaces promptly [12,13].…”

Section: Introductionmentioning

confidence: 99%

Study on the Long-Term Salt Release Characteristics of Self-Melting Ice Asphalt Mixtures and Their Impact on Pavement Performance

Liu,

Guo,

Sun

et al. 2024

Polymers

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Self-melting ice asphalt pavement materials inhibit pavement freezing and improve driving safety. This paper aims to study the long-term salt release characteristics of self-melting ice asphalt mixtures and the impact on pavement after complete salt release. Firstly, a method to accelerate the rapid release of salt based on the Los Angeles abrasion tester. Then, long-term salt release patterns were elucidated under the influence of deicing agent dosage, type of asphalt, and type of gradation. Finally, a quantitative analysis of the pavement performance after complete salt release is conducted. The results indicate that the release efficiency of the Los Angeles abrasion tester method has increased by 91 times compared to the magnetic stirrer immersion flushing method and by 114 times compared to the natural soaking method. The SBS-modified self-melting ice asphalt mixture possesses a longer duration of salt release, but the uniformity of salt release is inferior. Salt release duration is directly proportional to the dosage of deicing agents. SMA-13 self-melting ice asphalt mixture exhibits poorer uniformity in salt release. After complete salt release, high-temperature stability of self-melting ice asphalt mixtures decreased by 31.6%, low-temperature performance decreased by 15.4%, water stability decreased by 26.7%, and fatigue life decreased by 35.9%.

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“…This leads to insufficient compaction of the recycled road surface and poor-quality information, making it prone to early deterioration [16,17]. Warm-mix asphalt (WMA) technology can reduce the viscosity of asphalt binder without increasing the heating temperature [18], thereby improving the workability of the mixture and effectively enhancing the compaction quality of asphalt pavements [19][20][21]. Techniques like foam warm-mix asphalt (FWMA) utilize the high temperature of asphalt to vaporize liquid water, leading to foaming of the asphalt and an increase in its surface area.…”

Section: Introductionmentioning

confidence: 99%

Compaction Characteristics of a Foam Asphalt Hot In-Place Recycling Asphalt Mixture

Sun,

Guo,

et al. 2023

Buildings

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This study investigates the application of foam asphalt (FA) to enhance the compaction effectiveness of a hot in-place recycling asphalt mixture (HIR-AM) during the HIR process of old road surfaces. Initially, the process parameters for FA preparation were determined through expansion-rate and half-life tests. Subsequently, the study focused on evaluating the impact of FA on the compaction quality of HIR-AM. Performance assessments were conducted through rutting tests, low-temperature bending tests, Hamburg wheel tracking tests, dynamic modulus analyses, and various other experiments to evaluate the road performance of HIR-FAM. Finally, the research findings were validated through practical engineering applications, and the construction process for HIR-FAM was summarized. The research results reveal that the optimal foaming temperature for SBS asphalt is 170 °C, with an ideal water content of 1.7%. Under the same compaction temperature, HIR-FAM demonstrated a significant reduction in void content, ranging from 3.8% to 21.2% compared to HIR-AM. Moreover, a higher proportion of FA usage resulted in a more substantial decrease in void content. Compared to HIR-AM, HIR-FAM exhibited notable improvements, including an 11.6% increase in dynamic stability, a 13.4% enhancement in bending strength, a 13.3% increase in maximum bending strain, an 8.1% improvement in residual stability, and an 8.5% boost in freeze–thaw splitting strength. Furthermore, HIR-FAM demonstrated superior water-thermal stability and resistance to low-frequency loads. Paving a test road verified that the adoption of foam asphalt in thermal recycling led to a compaction density increase of over 0.79% compared to traditional in situ thermal recycling sections, with improved compaction uniformity.

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Study on the blending behavior of asphalt binder in mixing process of hot recycling

Cited by 10 publications

References 34 publications

Effect of Blending Behavior on the Performance of Hot Recycled Asphalt Mixtures

Effect of Blending Behavior on the Performance of Hot Recycled Asphalt Mixtures

Study on the Long-Term Salt Release Characteristics of Self-Melting Ice Asphalt Mixtures and Their Impact on Pavement Performance

Compaction Characteristics of a Foam Asphalt Hot In-Place Recycling Asphalt Mixture

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