Laboratory Study on Ultraviolet Aging Behavior of Asphalt Binder and Mixture

Tan, Yiqiu; Wang, Jiani; Zou, Xue; Feng, Zhongliang; Xu, Hanyue

doi:10.1061/40952(317)73

Cited by 12 publications

(7 citation statements)

References 3 publications

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“…The high temperature grade of the 30 wt% V-PU modified asphalt was PG 82 °C, 4 grades higher than that of the base asphalt. The asphaltene content of the asphalt increases, while the content of the resin, aromatic, and saturated components decreases in the long-term high-temperature environment [38]. The irrecoverable viscosity component of the material increased under repeated loading and was more likely to lead to permanent deformation.…”

Section: Resultsmentioning

confidence: 99%

Rheological and Aging Properties of Vegetable Oil-Based Polyurethane (V-PU) Modified Asphalt

2023

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To study the rheological and aging properties of vegetable oil–based polyurethane (V-PU)–modified asphalt, V-PU terminated with an –NCO group was synthesized from renewable castor oil, and liquefied MDI-100LL and 10–40 wt% V-PU modified asphalts were prepared. Temperature classification, multiple stress creep recovery (MSCR), and linear amplitude scanning (LAS) tests were carried out. The results showed that the modulus, the creep recovery rate (R), and the yield stress and yield strain of the V-PU modified asphalts significantly increased in the order: 0 wt% < 10 wt% < 20 wt% < 40 wt% < 30 wt%, while the phase angle and the unrecoverable creep compliance (Jnr) changed in the opposite order, and the high temperature grade of 30 wt% V-PU modified asphalt was 4 grades higher than that of the base asphalt, which indicated that the addition of V-PU enhanced the fatigue, permanent deformation, and recovery deformation resistance. The 30 wt% sample-exhibited phase inversion had the best performance. Comprehensive FTIR, GPC, and fluorescence microscopy analyses showed that the molecular weight significantly increased and the V-PU molecules agglomerated after aging. The excess–NCO groups of V-PU prepolymer react with water in the air and the active hydrogen in the asphalt system and finally form a cross-linked three-dimensional network structure with the asphalt to improve performance. The mechanism of intramolecular cementation reaction and the aging process of V-PU-modified asphalt was creatively derived.

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Section: Resultsmentioning

confidence: 99%

Rheological and Aging Properties of Vegetable Oil-Based Polyurethane (V-PU) Modified Asphalt

2023

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“…Moreover, the intensive solar radiation will also accelerate the thermal oxidation and photooxidation of asphalt materials [35][36][37]. e long-term ultraviolet radiation causes serious degradation of asphalt performance and attenuates the durability of pavements [38]. erefore, solar radiation intensity must be considered when implementing climate regionalization.…”

Section: Solar Radiationmentioning

confidence: 99%

Climate Regionalization of Asphalt Pavement Based on the K‐Means Clustering Algorithm

Yang

Qian

et al. 2020

Advances in Civil Engineering

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The climate regionalization of asphalt pavement plays an active role in ensuring the good performance and service life of asphalt pavement. In order to better adapt to the climate characteristics of a region, this study developed a multi-index method of climate regionalization of asphalt pavement. First, meteorological data from the research region were statistically analyzed and the major climate variables were identified. Then, a principal component analysis (PCA) was used to eliminate any correlation between the major climate variables. Three principal components were extracted by the PCA as cluster factors, namely, the temperature factor, precipitation factor, and radiation factor. The research region was divided into the following four asphalt pavement climate zones via the K-means clustering algorithm. Those zones are affected by the climate comprehensively: an inland zone with high temperatures, little rainfall, and radiation, a coastal zone with high temperatures, and a rainy mountainous zone. The results of the climate regionalization were compared with the results of on-site investigations. The pavement degradation in each climatic zone was related to the climate characteristics of the region. Probabilistic neural network (PNN) and support vector machine (SVM) climate regionalization predictive models were established with MATLAB. The clustering factors were used as the input data to identify the climate zones, and the identification accuracy rate was determined to be over 90%. The climate regionalization of pavement can provide reference and guidance for the selection of reasonable technical measures, parameters, and building materials in highway projects with similar climatic conditions.

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“…12,23 After UV radiation aging, asphalt turns from sol-type to gel-type and other aging types, and the viscosity decreases while the elasticity increases markedly. 12,24 Different from the TO aging mechanism of thermal decomposition, UV-aged asphalt undergoes a photooxidation reaction, unsaturated carbon chains in asphalt are oxidized to C O, and sulfur is oxidized to S O. 20,24 For ER, UV aging only affects the surface layer, resulting in a decrease in mechanical properties, such as flexural strength and impact strength, and impairs the interface of the outermost layer.…”

Section: Introductionmentioning

confidence: 99%

“…12,24 Different from the TO aging mechanism of thermal decomposition, UV-aged asphalt undergoes a photooxidation reaction, unsaturated carbon chains in asphalt are oxidized to C O, and sulfur is oxidized to S O. 20,24 For ER, UV aging only affects the surface layer, resulting in a decrease in mechanical properties, such as flexural strength and impact strength, and impairs the interface of the outermost layer. 25 The composition and structure of ER primarily change as follows: when exposed to UV rays, the covalent bond is broken, causing the molecular chain to break, forming active free radicals, and the free radicals accelerate the degradation of the molecular chain.…”

Section: Introductionmentioning

confidence: 99%

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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Laboratory Study on Ultraviolet Aging Behavior of Asphalt Binder and Mixture

Cited by 12 publications

References 3 publications

Rheological and Aging Properties of Vegetable Oil-Based Polyurethane (V-PU) Modified Asphalt

Rheological and Aging Properties of Vegetable Oil-Based Polyurethane (V-PU) Modified Asphalt

Climate Regionalization of Asphalt Pavement Based on the K‐Means Clustering Algorithm

UV aging behavior and mechanism of cold‐mixed epoxy asphalt

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