Effect of Rejuvenator on Performance Properties of WMA Mixtures with High RAP Content

Sabouri, Mohammadreza; Choi, Yeong-Tae; Wang, Yizhuang; Hwang, Sungdo; Baek, Cheolmin; Kim, Richard

doi:10.1007/978-94-017-7342-3_38

Cited by 9 publications

(4 citation statements)

References 10 publications

(6 reference statements)

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“…These dynamic moduli were used for constructing the master curves which were then provided as inputs for calculating the C and S values based on VECD theory. This finding is in accordance with what Sabouri et al (15) observed when they compared the C versus S curves of warm mix and hot mix asphalts containing RAP.…”

Section: Analysis Of Mixtures Resistance To Fatiguesupporting

confidence: 92%

Performance Evaluation of Bioengineered Recycled Asphalt Materials

Arabzadeh

Podolsky

Staver

et al. 2021

Transportation Research Record: Journal of the Transportation R

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In this study, asphalt mixtures were engineered with bio-renewable soybean oil-derived modifiers, and then used for pavement demonstration projects in the U.S. states of Iowa and Minnesota in the summer of 2019. The performance grade, elastic recovery (R), and non-recoverable creep compliance (Jnr) of the binders were evaluated. The modification of asphalt binder for the Iowa project almost maintained the high and low temperature grades, and the presence of modifier in the mixture of Minnesota project resulted in a slight decrease in the low temperature grade while maintaining the high temperature grade. The Jnr and R values proved the increase of elasticity and relaxation of the asphalt binder modified for the Iowa project. The Jnr calculated for the Minnesota project revealed a considerable increase in the relaxation of the asphalt binder. Disc-shaped compact tension, Hamburg wheel tracking, and push-pull were the mechanical performance tests performed on the mixtures. Based on the results obtained from these tests, the Iowa mixture, produced with modified asphalt binder, showed a significant improvement in resistance to low-temperature cracking, rutting, moisture damage, and fatigue cracking. The Minnesota mixture, modified in the plant, showed a significant improvement in the fatigue performance and a slight improvement in low-temperature cracking resistance.

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Section: Analysis Of Mixtures Resistance To Fatiguesupporting

confidence: 92%

Performance Evaluation of Bioengineered Recycled Asphalt Materials

Arabzadeh

Podolsky

Staver

et al. 2021

Transportation Research Record: Journal of the Transportation R

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“…Table 1 provides details about the mixtures evaluated in this study. The test results for these mixtures have been presented previously in research papers ( 6 – 10 ).…”

Section: Methodsmentioning

confidence: 99%

Improving the Reliability of Damage Characteristic Curves in the Simplified Viscoelastic Continuum Damage Model

Lee

Castorena

Kim

2018

Transportation Research Record: Journal of the Transportation R

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One of the major advantages of the cyclic fatigue test (AASHTO TP 107) is that the results can be used to calibrate the Simplified Viscoelastic Continuum Damage (S-VECD) model, which is used for mechanistic pavement performance predictions. The crux of the S-VECD model is the damage characteristic curve, which has been shown to be independent of mode of loading, loading history, and temperature. Consequently, a model can be fitted to the damage characteristic curve and used to predict the damage response for any given loading history of interest using limited test results. AASHTO TP 107 currently lacks a specific procedure for fitting a model to the damage characteristic curve and evaluating the repeatability of test replicates. In this study, a robust and practical method is proposed for fitting a power law model to the damage characteristic curve. The proposed fitting method was verified using cyclic fatigue test results of 19 mixtures sourced from the United States, Canada, and South Korea. In addition, a means to evaluate the specimen-to-specimen variability of damage characteristic curves using a shape factor is proposed. Thresholds for acceptable variability in the shape factor were derived using confidence interval analysis and verified through FlexPAVE™ pavement performance predictions. The findings of this study can be used to improve the reliability of the damage characteristic curves derived from cyclic fatigue tests for pavement performance predictions.

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“…The asphalt mixtures' resistance to moisture damage is shown in terms of ITSR in Figure 10. Regarding moisture damage, the authors of [36] concluded that asphalt mixtures containing high percentages of RA and RA aggregates and already coated with aged binder have decreased water sensitivity. Similar results were reached by the authors of [37].…”

Section: Water Sensitivitymentioning

confidence: 99%

Evaluation of the Mechanical Performance of Warm Bio-Recycled Asphalt Mixtures

Alsarayreh,

Jiménez del Barco Carrión

2024

Sustainability

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Currently, approximately 90% of road pavement mixtures are derived from fossil fuels, a major source of the greenhouse gases contributing to global warming. This fact, together with the scarcity of raw materials in pavement engineering, has prompted recent investigations into sustainable alternatives. Biobinders, serving as substitutes or modifiers for petroleum-based asphalt binders, have gained attention, alongside the integration of recycled materials in recycled asphalt (RA). This study addresses these concerns by combining three techniques: (1) substituting a bitumen-based binder with a biobinder; (2) incorporating a high RA percentage (>30%); and (3) manufacturing the asphalt mixture at a reduced temperature (140 °C). These approaches result in the production and evaluation of warm bio-recycled asphalt mixtures. Materials were assessed at both the binder and mixture levels. The control binder, RA binder, and biobinder underwent conventional and rheological characterization. In terms of mixtures, warm bio-recycled asphalt mixtures employed a biobinder as the only virgin binder, with RA contents of 50% and 70%. Mechanical characterization focused on bearing capacity, cohesion, permanent deformations, and moisture damage. The warm bio-recycled asphalt mixtures exhibited adequate outcomes in bearing capacity through the stiffness modulus being 18,120 MPa and 15,683 MPa for bio-recycled asphalt with 50% RA and bio-recycled asphalt with 70% RA, respectively. Bio-recycled asphalt with 50% RA and bio-recycled asphalt with 70% RA showed low permanent deformation percentages, specifically 0.5% and 0.7%, respectively, in comparison to the reference recycled asphalt mixture with 1.5%, allaying concerns in practical applications due to the biobinder’s soft consistency. The bio-recycled asphalt mixture with 70% RA displayed good mechanical performance regarding the studied mechanical characterization, especially exhibiting the least susceptibility to water-induced damage with 97% of the retained indirect tensile strength ratio, addressing concerns related to moisture damage in warm asphalt mixtures with high RA content and biobinders. These findings offer valuable insights into the adoption of more sustainable practices in the asphalt pavement industry, reducing the concerns associated with warm bio-recycled asphalt mixtures.

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Effect of Rejuvenator on Performance Properties of WMA Mixtures with High RAP Content

Cited by 9 publications

References 10 publications

Performance Evaluation of Bioengineered Recycled Asphalt Materials

Performance Evaluation of Bioengineered Recycled Asphalt Materials

Improving the Reliability of Damage Characteristic Curves in the Simplified Viscoelastic Continuum Damage Model

Evaluation of the Mechanical Performance of Warm Bio-Recycled Asphalt Mixtures

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