Study on a thermosetting polyurethane modified asphalt suitable for bridge deck pavements: Formula and properties

Zhang, Zengping; Sun, Jia; Jia, Meng; Qi, Bing; Zhang, Hongliang; Lv, Wei; Mao, Zhiyong; Chang, Pengtao; Jiang, Peng; Liu, Yichen

doi:10.1016/j.conbuildmat.2020.118122

Cited by 54 publications

(8 citation statements)

References 32 publications

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“…A larger S and smaller m indicate reduced low-temperature crack resistance. Compared with the SBS-2 modified asphalt, the 90-1 base asphalt had a greater increase in S and a greater decrease in m, indicating that the low-temperature crack resistance of the modified asphalt after aging was better than that of the base asphalt [48,49]. modified asphalt at UV32h and UV64h decreased compared with that before aging, while the S of 90-1 base asphalt after aging showed an increasing trend.…”

Section: Bending Beam Rheological Testmentioning

confidence: 90%

“…A larger S and smaller m indicate reduced low-temperature crack resistance. Compared with the SBS-2 modified asphalt, the 90-1 base asphalt had a greater increase in S and a greater decrease in m, indicating that the low-temperature crack resistance of the modified asphalt after aging was better than that of the base asphalt [48,49]. Through an analysis of the BBR test, it could be seen that UV aging reduced the lowtemperature crack resistance of asphalt; the longer the UV aging time, the more severe the degradation of asphalt performance.…”

Section: Bending Beam Rheological Testmentioning

confidence: 97%

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Aging Characteristics of Asphalt Binder under Strong Ultraviolet Irradiation in Northwest China

2021

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Asphalt pavement is significantly affected by ultraviolet (UV) aging. Therefore, the establishment of an asphalt UV aging evaluation system is desirable for highway construction in areas which experience strong UV radiation. In this study, Dunhuang City in Gansu Province (northwest China) was used as the research site. Base and SBS modified asphalts were selected, and their performance changes before and after UV aging were studied. An asphalt UV aging evaluation system was established, including the conditions for an indoor, accelerated UV aging test as well as evaluation indicators. The results showed that the adverse effect of UV aging on asphalt performance was greater than that of RTFOT and PAV, and that the low-temperature performance of asphalt degraded most rapidly. SBS modified asphalt was more resistant to UV aging than base asphalt, while 60/80 pen grade base asphalt was found to be unsuitable for use on pavements which are exposed to strong UV radiation. The residual penetration, penetration attenuation index at 25 °C, and residual ductility of the asphalt were used as indicators to characterize the aging of asphalt, while the fracture energy method was used as a supplementary evaluation method.

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Section: Bending Beam Rheological Testmentioning

confidence: 90%

“…A larger S and smaller m indicate reduced low-temperature crack resistance. Compared with the SBS-2 modified asphalt, the 90-1 base asphalt had a greater increase in S and a greater decrease in m, indicating that the low-temperature crack resistance of the modified asphalt after aging was better than that of the base asphalt [48,49]. Through an analysis of the BBR test, it could be seen that UV aging reduced the lowtemperature crack resistance of asphalt; the longer the UV aging time, the more severe the degradation of asphalt performance.…”

Section: Bending Beam Rheological Testmentioning

confidence: 97%

Aging Characteristics of Asphalt Binder under Strong Ultraviolet Irradiation in Northwest China

2021

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“…Therefore, thermosetting polyurethane modified asphalt has been studied by several scholars. Zhang et al [ 32 ] determined the appropriate formula for a thermosetting PU (TS-PU) modified binder through a series of laboratory tests, studied the comprehensive properties of asphalt modifiers containing various TS-PU contents, and determined the optimum content of modifiers. It has also been shown that a TS-PU modified modifier is superior to epoxy modifiers in terms of the high-temperature rutting resistance and tensile strength, flexibility, and cost.…”

Section: Introductionmentioning

confidence: 99%

Preparation Scheme Optimization of Thermosetting Polyurethane Modified Asphalt

Sun

Jing

Weng³

et al. 2023

Polymers

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To solve the issue of the poor temperature stability of conventional modified asphalt, polyurethane (PU) was used as a modifier with its corresponding curing agent (CA) to prepare thermosetting PU asphalt. First, the modifying effects of the different types of PU modifiers were evaluated, and the optimal PU modifier was then selected. Second, a three-factor and three-level L9 (33) orthogonal experiment table was designed based on the preparation technology, PU dosage, and CA dosage to prepare the thermosetting PU asphalt and asphalt mixture. Further, the effect of PU dosage, CA dosage, and preparation technology on the 3d, 5d, and 7d splitting tensile strength, freeze-thaw splitting strength, and tensile strength ratio (TSR) of the PU asphalt mixture was analyzed, and a PU-modified asphalt preparation plan was recommended. Finally, a tension test was conducted on the PU-modified asphalt and a split tensile test was performed on the PU asphalt mixture to analyze their mechanical properties. The results show that the content of PU has a significant effect on the splitting tensile strength of PU asphalt mixtures. When the content of the PU modifier is 56.64% and the content of CA is 3.58%, the performance of the PU-modified asphalt and mixture is better when prepared by the prefabricated method. The PU-modified asphalt and mixture have high strength and plastic deformation ability. The modified asphalt mixture has excellent tensile performance, low-temperature performance, and water stability, which meets the requirements of epoxy asphalt and the mixture standards.

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“…Fully solid, eco-friendly and cost-efficient are a number of characteristics that polyurethane (PU) thermoset powder coatings are known for among all the emerging coatings, and the reason why PU has been considered as the best alternative for construction and building materials to reduce the hazardous volatile organic chemicals quite frequently used in the paint and varnish industry [1,2]. The high cross-link density, energy saving features and excellent application performance have made PU coatings prominent candidates for decorative and protective purposes [3][4][5][6]. However, when it comes to the applications where stability and resistance to harsh conditions, such as thermal or stress shock, UV solar radiation and temperature elevations, are among the criteria, such coatings lose their properties as a consequence of cracking and thermal degradation that seriously shortens their service lifetime [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Polyurethane/Silane-Functionalized ZrO2 Nanocomposite Powder Coatings: Thermal Degradation Kinetics

et al. 2020

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A polyurethane (PU)-based powder coating reinforced with vinyltrimethoxysilane (VTMS)-functionalized ZrO 2 nanoparticles (V-ZrO 2 ) for thermal stability was developed. Chemical structure, microstructure and thermal degradation kinetics of the prepared coatings were investigated. The peak of aliphatic C-H vibrating bond in the Fourier transform infrared (FTIR) spectrum of V-ZrO 2 was a signature of VTMS attachment. Scanning electron microscopy (SEM) images reveled that, by increase of V-ZrO 2 content from 0.1 to 0.3 wt.% and then 0.5 wt.%, some agglomerations of nanoparticles are formed in the PU matrix. Thermogravimetric analysis (TGA) of the PU/V-ZrO 2 powder coatings was performed at different heating rates nonisothermally to capture alteration of activation energy (E a ) of degradation of PU/V-ZrO 2 powder coatings as a function of partial mass loss by using Friedman, Kissinger-Akahira-Sunose (KAS), Ozawa-Wall-Flynn (FWO) and modified Coats-Redfern isoconversional approaches. It was observed that by addition of 1 wt.% V-ZrO 2 to PU resin the early state degradation temperature at 5% weight loss increased about 65 • C, suggesting a physical barrier effect limiting the volatility of free radicals and decomposition products. Incorporation of 5 wt.% ZrO 2 led to about 16% and 10% increase in E a and LnA of blank PU, respectively, which was indicative of higher thermal resistance of nanocomposite powder coatings against thermal degradation. There was also obvious agreement between model outputs and experimental data. The results reveal that nanocomposite coating shows superior thermal properties compared to neat PU powder coatings, and the presence of nano ZrO 2 in sufficient amount causes retardation of the thermal decomposition process.

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Study on a thermosetting polyurethane modified asphalt suitable for bridge deck pavements: Formula and properties

Cited by 54 publications

References 32 publications

Aging Characteristics of Asphalt Binder under Strong Ultraviolet Irradiation in Northwest China

Aging Characteristics of Asphalt Binder under Strong Ultraviolet Irradiation in Northwest China

Preparation Scheme Optimization of Thermosetting Polyurethane Modified Asphalt

Polyurethane/Silane-Functionalized ZrO2 Nanocomposite Powder Coatings: Thermal Degradation Kinetics

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