Aging degradation of anhydride-cured epoxy asphalt binder subjected to ultraviolet exposure

Wang, Qichang; Min, Zhaohui; Wong, Yiik Diew; Shi, Zhiyong; Huang, Wei

doi:10.1080/10298436.2023.2171037

Cited by 13 publications

(14 citation statements)

References 40 publications

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“…Comparing the influences of UV and TO on the chemical structure of the ER, the oxygen content of TO‐ER was lower than that of ER but increased for UV‐ER (Figure 9A). The TO‐ER and UV‐ER have thus undergone post‐curing and thermal decomposition 44 . An oxidation reaction also occurred, and a carbonyl group (CO) formed after UV aging according to the FTIR spectra and XPS results (Figure 4A, Figure 5B).…”

Section: Resultsmentioning

confidence: 96%

“…The TO-ER and UV-ER have thus undergone post-curing and thermal decomposition. 44 An oxidation reaction also occurred, and a carbonyl group (C O) formed after UV aging according to the FTIR spectra and XPS results (Figure 4A, Figure 5B). Compared with ER, the T g of TO-ER increased, while that of UV-ER decreased (Figure 10), indicating that TO aging primarily brought about post-curing of ER; UV aging primarily led to ER thermal decomposition and oxidation reaction (Figure 11).…”

Section: Aging Mechanism Analysismentioning

confidence: 92%

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UV aging behavior and mechanism of cold‐mixed epoxy asphalt

Jiang,

Si,

Zhang

et al. 2023

Vinyl Additive Technology

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In environmental conditions, the ultraviolet (UV) light from sunshine will trigger epoxy asphalt (EA) paving materials aging and performance reduction. This work studied the influence of UV aging on the structure and mechanical performance of cold‐mixed epoxy asphalt (CEA) to evaluate its aging mechanism. The chemical structure of CEA was tested by Fourier transform infrared spectra, X‐ray photoelectron spectroscopy, and micromorphology was observed through fluorescence microscopy. The mechanical properties of CEA were studied by tensile tests and dynamic mechanical analysis. The results indicated that the toughness of CEA went down due to UV aging, and the elongation at break and glass transition temperature decreased by 35.5% and 6.0°C, respectively. Based on structural analysis, the UV aging mechanism of CEA was summarized as follows: (1) the curing network of epoxy resin was partially broken, and the asphalt particle aggregated; (2) the asphalt and epoxy resin in UV aging‐CEA were oxidized and formed carbonyl group and sulfonic group.Highlights Both asphalt and ER components in CEA underwent oxidation reactions and formed more CO, SO, and CO groups. UV‐CEA showed a decrease in toughness due to destruction of the cured ER cross‐linked network and shortening of the asphalt molecular chain E' and Tg of UV‐CEA was decreased, resulting from a decrease in ER crosslink density and an increase in molecular chain segment mobility of ER and asphalt.

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Section: Resultsmentioning

confidence: 96%

Section: Aging Mechanism Analysismentioning

confidence: 92%

UV aging behavior and mechanism of cold‐mixed epoxy asphalt

Jiang,

Si,

Zhang

et al. 2023

Vinyl Additive Technology

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“…After photooxidation aging, the aggregation phenomenon of epoxy resin and asphalt phase in 2-EA-UV with high anhydride content was alleviated. According to Wang's research, 11,13 EA underwent long carbon chain cracking during photooxidative aging. The cracking of long carbon chains decreased the molecular weight of the crosslinked network, making it easier for asphalt to enter the cross-linked network and alleviating the aggregation of asphalt phase.…”

Section: Phase Distributionmentioning

confidence: 99%

“…This trend may be related to microcracks caused by asphalt volatilization and degradation of resin rich structures. 11,13 The proportion of anhydride curing agent affected the tensile performance of EA and the ability to resist photooxidation aging. The tensile properties of 2-EA with high anhydride content showed better aging resistance, whereas the tensile properties of 20-EA with low anhydride content were more sensitive to photooxidative aging.…”

Section: Direct Tensile Testingmentioning

confidence: 99%

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The effect of photooxidation aging on the cohesion and interfacial adhesion behavior of epoxy asphalt with a composite acidic curing system based on molecular simulation

Min,

Li,

Chen

et al. 2024

J of Applied Polymer Sci

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This paper investigated the cross‐linking network structure of epoxy asphalt (EA) with the different ratio of composite curing agents, and further determined the effect of photooxidation aging on the tensile and interfacial adhesion behavior of EA with different cross‐linking network structures through molecular simulation. Based on the molecular models of EA and the interface model between EA and aggregate, the crosslinking network structural characteristics and tensile mechanical behavior were determined. The interfacial adhesion behavior and the mechanization were further studied. The results indicate that 20‐EA and 6‐EA have an epoxy resin cross‐linked network with uniform pore structure and phase distribution. 2‐EA showed a denser cross‐linking network and uneven aggregation phenomenon. Photooxidative aging alleviated the aggregation phenomenon. A dense cross‐linking network improved the tensile strength and the ability of tensile performance to resist photooxidation aging. The interface of EA‐quartz exhibited higher adhesion strength than EA‐calcite due to the closer distance and stronger nonbonding interactions between EA and quartz. The low anhydride content and photooxidation aging made EA approach to the aggregate interface, increasing nonbonding interaction and interfacial adhesion strength. In addition, quartz aggregates were more suitable for application in EA mixtures due to the higher interfacial adhesion strength and lower water sensitivity.

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