Performance of polyurethane modified asphalt and its mixtures

Sun, Mingyue; Zheng, Min; Qu, Guangzhen; Kun, Yuan; Bi, Yi; Jian, Wang

doi:10.1016/j.conbuildmat.2018.10.025

Cited by 127 publications

(35 citation statements)

References 21 publications

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“…A high-speed shear mixer rated at 300 W and manufactured by Shanghai Frank (Shanghai, China) was used in the sample preparation to maximize the mixing consistency. Based on previous study and test experience [19,[49][50][51][52][53], the proportion of ES in the asphalt was 5, 10, and 15% (mass percentage), and the shear rate was optimized. The sample preparation process was as follows.…”

Section: Flash Point (°C)mentioning

confidence: 99%

Research on High- and Low-Temperature Characteristics of Bitumen Blended with Waste Eggshell Powder

Wang

Zhang

et al. 2021

Materials

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The sustainability of resources is presently a major global concern. Sustainable construction materials can be produced by applying biological waste to engineering. Eggshells, as biological waste, are usually dumped in landfills or discarded. This causes many environmental problems including malodor, noise pollution, and serious waste of resources. To solve these problems, this study combined eggshell waste with bitumen materials for bio-roads construction. This paper investigated the impact of biological waste eggshell powder on the high- and low-temperature characteristics of bitumen materials. Scanning electron microscopy (SEM) revealed the microstructure of eggshell powder. The interaction between eggshell powder and asphalt was analyzed using Fourier transform infrared spectroscopy (FT-IR). The high- and low-temperature characteristics were investigated using conventional performance tests, and dynamic shear rheometer (DSR) and bending beam rheometer (BBR) experiments. These results indicate that eggshell powder (1) has a rough and porous microstructure; (2) has no apparent chemical reaction with asphalt; and (3) improves the consistency, hardness, and high-temperature characteristics. However, it reduces the plastic deformation capacity of asphalt, and the low-temperature crack resistance of asphalt cannot be improved. The research demonstrated that the application of eggshell powder in asphalt is feasible and has long-term resource and environmental advantages.

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Section: Flash Point (°C)mentioning

confidence: 99%

Research on High- and Low-Temperature Characteristics of Bitumen Blended with Waste Eggshell Powder

Wang

Zhang

et al. 2021

Materials

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“…As shown in Figure 8, in the MSCR test, two key parameters can be obtained: R and Jnr were calculated by using Equations (2.13, 2.14), respectively (Wang et al, 2017 (JTG E20-2011) (Sun et al, 2018). It should be emphasized that the base asphalt was simplified as base asphalt (BA) in the above figures.…”

Section: Rheological Propertiesmentioning

confidence: 99%

“…The most prominent one was the characteristic peak of -NHCOO-at 1,717 and 1,729 cm −1 in the FTIR curve of polyester-based TPU-modified leachate and polyether-based TPU-modified leachate. In the synthesis process of TPU modifier, -NCO group itself is excessive, but there is no obvious isocyanate characteristic peak in the FTIR of TPU-modified asphalt, then a new -NHCOO characteristic peak appears, which indicated that both polyester TPU and polyether TPU can react with some active functional groups in base asphalt, and new compounds are generated (Sun et al, 2018). The main reactions in TPU-modified asphalt were the isocyanate and polyol to form carbamate, furthermore, the isocyanate and aromatic compounds to form halohydrins in the asphalt by an addition reaction.…”

Section: Ftirmentioning

confidence: 99%

Influence on Polyurethane Synthesis Parameters Upon the Performance of Base Asphalt

Jin

Sun²,

Guo

et al. 2021

Front. Mater.

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The objective of this study aims to investigate the performance of thermoplastic polyurethane elastomers (TPU)-modified asphalt, with special focus on the influence of polyurethane synthesis parameters upon the performance of base asphalt. In this study, the TPU modifier was incorporated into base asphalt to prepare TPU-modified asphalt by using a self-determined laboratory process. The properties of polyester-based TPU and polyether-based TPU modified asphalt with different contents was analyzed by the base performance tests. The Fourier transform infrared spectroscopy (FTIR), fluorescent microscope, scanning electron microscopy (SEM), differential scanning calorimetry (DSC), thermal gravity (TG), dynamic shear rheology (DSR), and bending beam rheology (BBR) tests were conducted to expose chemical, microstructure, and rheological properties of the asphalt binders, respectively. The results indicated that the modified asphalt with 5% TPU modifier exhibited a favorable performance in terms of the penetration, ductility, softening point, and rotational viscosity, respectively. The isocyanate and polyol reacted to form carbamate in the TPU-modified asphalt, and moreover the isocyanate and aromatic compounds reacted to form halohydrins in the asphalt. Large particles contained in the polyester-based TPU-modified asphalt increased obviously with the increase of Ch (Hard segment content) and r (Isocyanate root index, molar ratio between NCO and OH) value, the fracture mode of it subjected to external load indicated a typical brittle fracture. The content of MDI in the synthesized polyurethane modifier was an important factor affecting the high-temperature stability of the modified asphalt. The polyester-based TPU modifier had a better high temperature performance than the polyether-based TPU modifier. The polyether polyol chain segment showed a greater flexibility as compared to polyester polyol; the addition of polyether polyols can be effectively offset of MDI chain rigidity as r ≤ 1 and Ch < 40% leading to the improvement of the viscoelastic property of asphalt. When Ch = 40% and r = 0.95, the polyether-based TPU-modified asphalt exhibited the same high-temperature grade as the polyester-based TPU-modified asphalt, whereas the polyether-based TPU-modified asphalt showed obviously higher low temperature grades. The polyester-based TPU with Ch = 40% and r = 1 can be used as a modifier to increase the durability of asphalt binders.

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“…e test was conducted according to T324-2014 of American Association of State Highway and Transportation Officials (AASHTO) [30]. e Hamburg wheel tracking device was from Troxler of America and is shown in Figure 7.…”

Section: Hamburg Wheel Tracking Testmentioning

confidence: 99%

Evaluation of a Cold-Mixed High-Performance Polyurethane Mixture

Sun

Zheng

et al. 2019

Advances in Materials Science and Engineering

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The energy consumption and greenhouse gas emission of asphalt pavement have become a very serious global problem. The high-temperature stability and durability of polyurethane (PU) are very good. It is studied as an alternative binder for asphalt recently. However, the strength-forming mechanism and the mixture structure of the PU mixture are different from the asphalt mixture. This work explored the design and performance evaluation of the PU mixture. The PU content of mixtures was determined by the creep slope (K), tensile strength ratios (TSR), immersion Cantabro loss (ICL), and the volume of air voids (VV) to ensure better water stability. The high- and low-temperature stability, water stability, dynamic mechanical property, and sustainability of the PU mixture were evaluated and compared with those of the stone matrix asphalt mixture (SMA). The test results showed that the dynamic stability and bending strain of the PU mixture were about 7.5 and 2.3 times of SMA. The adhesion level of PU and the basalt aggregate was one level greater than the limestone, and basalt aggregates were proposed to use in the PU mixture to improve water stability. Although the initial TSR and ICL of PU mixture were lower, the long-term values were higher; the PUM had better long-term water damage resistance. The dynamic modulus and phase angles (φ) of the PU mixture were much higher. The energy consumption and CO2 emission of the PU mixture were lower than those of SMA. Therefore, the cold-mixed PU mixture is a sustainable material with excellent performance and can be used as a substitute for asphalt mixture.

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Performance of polyurethane modified asphalt and its mixtures

Cited by 127 publications

References 21 publications

Research on High- and Low-Temperature Characteristics of Bitumen Blended with Waste Eggshell Powder

Research on High- and Low-Temperature Characteristics of Bitumen Blended with Waste Eggshell Powder

Influence on Polyurethane Synthesis Parameters Upon the Performance of Base Asphalt

Evaluation of a Cold-Mixed High-Performance Polyurethane Mixture

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