Polyurethane as a modifier for road asphalt: A literature review

Huang, Gang; Yang, Tianhong; He, Zhaoyi; Liu, Yu; Xiao, Haixin

doi:10.1016/j.conbuildmat.2022.129058

Cited by 53 publications

(13 citation statements)

References 127 publications

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“…The test results indicate that PUA modified asphalt can meet lower performance levels (−18°C), and the addition of PUA improves the low‐temperature crack resistance of asphalt binder. This may be due to the cross‐linking of unsaturated chemical bonds in self‐healing accelerators and single bond S in asphalt, forming a network structure of molecular chains (commonly referred to as “Sx” bridges or “sulfur bridges”) 46,47 . This network structure hinders the cracking of asphalt under the coupling effect of temperature stress and load stress.…”

Section: Resultsmentioning

confidence: 99%

“…This may be due to the cross-linking of unsaturated chemical bonds in self-healing accelerators and single bond S in asphalt, forming a network structure of molecular chains (commonly referred to as "Sx" bridges or "sulfur bridges"). 46,47 This network structure hinders the cracking of asphalt under the coupling effect of temperature stress and load stress.…”

Section: High-temperature Rheological Propertiesmentioning

confidence: 99%

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Rheological properties and aging resistance of self‐healing polyurea elastomer modified asphalt

Li,

Zhang,

et al. 2024

Polymer Engineering & Sci

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Polymer modified asphalt containing dynamic chemical bonds has the potential to increase the service life of asphalt pavement due to its excellent self‐healing ability. The effect of this self‐healing accelerator with dynamic chemical bond on the rheological properties and aging resistance of asphalt binder is still unclear. In this study, a self‐healing polyurea elastomer (PUA) modified asphalt containing dynamic disulfide bonds was prepared. The high‐ and low‐temperature performance and fatigue resistance of PUA modified asphalt were studied through multiple stress creep, low‐temperature bending beam rheometer, mechanical glass transition temperature, and linear amplitude scanning tests. Moreover, considering the service environment of asphalt over a wide temperature range (−30–70°C), three rheological aging indices (RAI) were proposed. At the same time, the aging resistance of PUA modified asphalt was evaluated by chemical aging index (CAI) based on carbonyl and sulfoxide groups. Finally, a linear relationship is established between RAI and CAI over a wide temperature range. The experimental results show that self‐healing accelerators can increase the resistance to permanent deformation of asphalt by 47.41% and the fatigue resistance by 88.54%. The S value of PUA modified asphalt decreased by at most 33.21% and the m value increased by at most 35.23% compared with BA at −18°C. Moreover, PUA can improve the long‐term thermal oxygen aging resistance of asphalt binders by at least 38.33% over a wide temperature range.Highlights Rheological properties of self‐healing polyurea elastomer modified asphalt. Aging resistance of self‐healing polyurea elastomer modified asphalt. Proposed rheological aging indices for different temperature ranges. Clarified the correlation between chemical–rheological aging indices.

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Section: Resultsmentioning

confidence: 99%

Section: High-temperature Rheological Propertiesmentioning

confidence: 99%

Rheological properties and aging resistance of self‐healing polyurea elastomer modified asphalt

Li,

Zhang,

et al. 2024

Polymer Engineering & Sci

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“…PU is a green modified asphalt material, and is a multi-block polymer that can adjust the type and proportion of isocyanate, polyol, and other additives to design different structures. With its high degree of designability, it can be utilized used across various industrial production fields, such as plastics, films, adhesives, synthetic leather, and elastomers [ 14 , 15 , 16 ]. Currently, the primary application of PU in the domain of road pavement mainly focuses on two research directions, with one of them involving using PU to replace asphalt as a binder.…”

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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“…Polyurethane synthesis is mainly the reaction between isocyanates and active hydrides (hydroxyl) in polyether polyol. The nucleophilic center of active hydride collides with the electrophilic center of isocyanate, causing the polymerization of two additional molecules [ 10 ]. Therefore, the size of intermolecular interaction energy and the diffusion behavior of two-component molecules in the system affect the collision probability between molecules and the adequacy and rate of the polymerization reaction.…”

Section: Introductionmentioning

confidence: 99%

Study on Mechanical Properties of Two-Component Polyurethane Based on Multi-Scale Molecular Simulation

Wang

et al. 2023

Materials

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Mechanical properties determine the use of two-component polyurethane materials. The compatibility of two components in the polyether polyol-MDI molecular system greatly influences the formation of mechanical properties in polyurethane materials. In this paper, we studied and evaluated the compatibility and mechanical properties of two-component polyurethane at multiple scales by combining molecular dynamics simulation with macroscopic experiments, which is an important guideline for synthesizing and preparing two-component polyurethanes. We evaluated the stability of the two-component polyurethane system by calculating the solubility parameter, binding energy, and diffusion coefficient at four temperatures with three isocyanate contents. The Perl scripting language obtained the mechanical properties of the MDI-polyether polyol system. The MD calculation results show that the solubility parameter of two-component polyurethane negatively correlated with temperature, and the intermolecular binding energy and MDI diffusion coefficient positively correlated with temperature. When the mass ratio of polyether polyol to isocyanate was 1:0.6, the solubility parameter difference between the two was 1.43 (J/cm3)1/2, the intermolecular binding energy was 531.68 kcal/mol, and the two-component system was more stable. A macroscopic direct tensile test was employed to assess the polyurethane elastomers’ tensile properties. Our results show that the tensile strength of polyurethane elastomers increased with the increase in isocyanate content and decrease in temperature. Furthermore, the elongation at the break decreased, and the modulus increased, which is consistent with the law of molecular simulation.

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Polyurethane as a modifier for road asphalt: A literature review

Cited by 53 publications

References 127 publications

Rheological properties and aging resistance of self‐healing polyurea elastomer modified asphalt

Rheological properties and aging resistance of self‐healing polyurea elastomer modified asphalt

Preparation Scheme Optimization of Thermosetting Polyurethane Modified Asphalt

Study on Mechanical Properties of Two-Component Polyurethane Based on Multi-Scale Molecular Simulation

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