Effect of recycling agents on rheological properties of epoxy bitumen

Jing, Ruxin; Apostolidis, Panos; Liu, X.; Naus, Robbert; Erkens, Sandra; Scarpas, A.

doi:10.1080/14680629.2021.1986122

Cited by 12 publications

(3 citation statements)

References 31 publications

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“…Here, epoxAC was assumed as an M&R-free product (see the bottom part of Figure 10) because of its enhanced aging resistance and mechanical performance characteristics. As both reference and epoxAC materials have shown similar recyclability characteristics, they were treated the same in relation to EOL actions ( 31 ).…”

Section: Life Cycle Assessment (Lca) Resultsmentioning

confidence: 99%

First-Year Field Performance of Epoxy-Modified Asphalt

Jing

Apostolidis

Liu

et al. 2022

Transportation Research Record: Journal of the Transportation R

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Pavement materials containing epoxy-asphalt are mainly used to enhance the fatigue cracking resistance of surfacing layers on bridges. These materials have also been proposed for roadways, but limited field data are available. In this research, a fully instrumented epoxy-modified asphalt surfacing layer was applied to measure strain responses in service conditions. Results over the first-year monitoring period indicated that the epoxy-modified asphalt behaves fundamentally similarly to a reference one with an asphalt mix of the same aggregate gradation. The epoxy-modified asphalt demonstrated the lowest transverse compressive strains at decreased temperatures, reflecting the potentially high material resistance against thermal cracking. After the summer period, the modified material showed lower tensile strains than the reference mix compared with the previous time period. Such an attribute could indicate the ongoing curing-induced stiffening of epoxy-modified asphalt at high temperatures during summer. The longitudinal and transverse strain measurements had inverse tendencies at all temperatures. Finally, the mechanical response of the studied materials after the summer has been examined using a classical fatigue cracking model and following a life cycle assessment methodology, and preliminary findings support the use of epoxy-asphalt for sustainable pavements.

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Section: Life Cycle Assessment (Lca) Resultsmentioning

confidence: 99%

First-Year Field Performance of Epoxy-Modified Asphalt

Jing

Apostolidis

Liu

et al. 2022

Transportation Research Record: Journal of the Transportation R

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“…TS, MSCR, and BBR tests are utilized to test the high-and low-temperature rheological properties of WER-EA. FTIR and SEM tests are utilized to reveal the microcosmic mechanism of WER-EA [30]. The spectral range of FTIR was 500 cm -1 -4000cm -1 , the scanning frequency was 20 times/min, and the resolution was 4 cm -1 [31, 32].…”

Section: Preparation and Test Methodsmentioning

confidence: 99%

Effect of epoxy value on the rheological properties and microcosmic mechanism of WER emulsified asphalt

Huang,

Shi,

Ouyang

2024

PLoS ONE

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Waterborne epoxy resin (WER), a cleaning material with exceptional high-temperature resistance, has attracted much attention to modify emulsified asphalt in the pavement material field. Epoxy value is the critical characteristic index of WER. In this research, three WER with the epoxy values of 0.20 eq/100g, 0.44 eq/100g, and 0.51 eq/100g were utilized as asphalt modifiers. The influence of epoxy value on WER-EA was investigated by comparing the rheological properties of three kinds of WER emulsified asphalt (WER-EA). The modification mechanism of WER-EA has been analyzed using FTIR and SEM. The results demonstrate that different WER-EA resulted in significantly different rheological properties. WER-EA with the epoxy value of 0.20 eq/100g (E20) performed best at high temperatures, with a maximum increase of 17477% in G*/sinδ compared to the neat asphalt and a maximum increase of 66.3% in G*/sinδ compared to the other two WER-EA. WER-EA with 0.44 eq/100g epoxy value (E44) performed best at low temperatures, with a maximum increase in m value of 39.4% and a maximum decrease in S value of 33.3% compared to the other two WER-EA. In addition, the interpenetrating polymer network (IPN) in E20 was observed to be more solid and stable, and IPN in E44 was more uniform. To summarize, lower epoxy value led to a higher degree of WER reaction and higher content of rigid groups, which is more conducive to optimizing the high-temperature property of WER-EA. WER with moderate epoxy value resulted in a low content of polar bonds and thus high content of flexible segments, which helps emulsified asphalt to form a more uniform IPN.

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“…This approach to the disposal of epoxy RAP could reduce the amount of raw aggregate needed for the asphalt mixture and provide an alternative to landfill treatment, but would eventually dissipate the high-performance resin materials. Besides, Jing et al characterized the effect of recycling agents such as an aromatic-based agent, an aliphatic-based agent, and a soft bituminous binder on rheological properties of aged epoxy asphalt to evaluate the reusability ( 13 ). The relaxation properties of epoxy asphalt could be restored by the soft bituminous binder.…”

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Synthesis Strategy and Basic Validation of Recyclable Epoxy Asphalt

Zhou

Pei

et al. 2023

Transportation Research Record: Journal of the Transportation R

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The inefficient regeneration of epoxy asphalt is an increasingly serious problem that has greatly restricted its application and development. To alleviate this severe difficulty, recyclable epoxy asphalt has been designed on the basis of the reversibility of dynamic covalent bonds, taking into consideration its nonrenewable characteristics. The synthesis strategy and basic validation of recyclable epoxy asphalt were therefore preliminarily implemented in this study. According to the screening of reversible covalent bond-forming reactions (Diels–Alder reaction), the design scheme of recyclable epoxy asphalt was first proposed. Then the preparation and regeneration processes of recyclable epoxy asphalt were designed and adjusted to give a series of optimal solutions. Finally, samples of recyclable epoxy asphalt and conventional epoxy asphalt were analyzed and tested microscopically before and after regeneration. In comparison with conventional epoxy asphalt, recyclable epoxy asphalt exhibited outstanding sustainability and damping characteristics. Moreover, the damping characteristics of recyclable epoxy asphalt after regeneration were still better than those of conventional epoxy asphalt, which indicated that recyclable epoxy asphalt displayed promising performance. According to the regeneration efficiency, it can be concluded that recyclable epoxy asphalt was successfully prepared. However, mechanical properties of recyclable epoxy asphalt still need to be optimized from the perspective of the proportions of materials.

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Effect of recycling agents on rheological properties of epoxy bitumen

Cited by 12 publications

References 31 publications

First-Year Field Performance of Epoxy-Modified Asphalt

First-Year Field Performance of Epoxy-Modified Asphalt

Effect of epoxy value on the rheological properties and microcosmic mechanism of WER emulsified asphalt

Synthesis Strategy and Basic Validation of Recyclable Epoxy Asphalt

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