RETRACTED: Influence of thermoplastic polyurethane and synthesized polyurethane additive in performance of asphalt pavements

Bazmara, Behrokh; Tahersima, Mohammad; Behravan, Amir

doi:10.1016/j.conbuildmat.2018.01.093

Cited by 113 publications

(24 citation statements)

References 13 publications

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“…The current work reports the modification of a bitumen with thermoplastic polyurethanes, which has been very scarcely described in literature in the last years. Nevertheless, some works can be found in the recent literature dealing with the modification of bitumen with TPU in physical blends for roofing applications [40] or road pavements [41,42]. Polyurethane has also been used in other studies as a reactive polymer to modify bitumen either for processing bituminous foams or to create chemical reactions inducing covalent bonds between the polymer and bitumen's species in order to prevent phase separation in the corresponding blends [43][44][45][46][47][48][49].…”

Section: Introductionmentioning

confidence: 99%

Rheology-morphology relationships of new polymer-modified bitumen based on thermoplastic polyurethanes (TPU)

Gallu

Méchin

Dalmas

et al. 2020

Construction and Building Materials

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Section: Introductionmentioning

confidence: 99%

Rheology-morphology relationships of new polymer-modified bitumen based on thermoplastic polyurethanes (TPU)

Gallu

Méchin

Dalmas

et al. 2020

Construction and Building Materials

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“…Studies showed that 3 peaks including 450 Cm −1 , 850 Cm −1 and 1050 Cm −1 confirm nano-silica vibrational bonding (Shafabakhsh et al., 2019). Also, peak including 1726 Cm −1 confirm urethane band (Bazmara et al., 2018). The FTIR test results on the samples are shown in Figure 1.…”

Section: Chemical Testsmentioning

confidence: 91%

“…The results indicated an increase in the viscosity and the parameter G*/sinδ (Izquierdo et al., 2011). In a recent study on fatigue and rutting of polyurethane asphalt binders conducted by Bazmara et al. (2018), elevated G*/Sinδ and reduced G*Sinδ were reported.…”

Section: Introductionmentioning

confidence: 98%

Linking fatigue response of asphalt binders, mastics, and asphalt concrete mixture modified by nano-silica and synthesized polyurethane

Motamedi

Shafabakhsh

Azadi

2020

International Journal of Damage Mechanics

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Asphalt concrete is composed of stone, sand, filler, and asphalt binder. Fatigue can be considered as a phenomenon affecting both the binder (asphalt binder or mastic) and the mixture. The purpose of this study was to investigate the fatigue damage response in asphalt binders, mastics, and asphalt concrete mixtures modified with nano-silica and synthesized polyurethane. The continuum damage mechanics method and phenomenological approaches in this study were used to investigate the fatigue performance. Obtained results indicated that the effect of the synthesized polyurethane on improving the fatigue life was far greater than that of nano-silica. The damage process in asphalt binders differed from that in the mastic and asphalt concrete mixture. Damage intensity parameter is an appropriate criterion for evaluating fatigue performance of asphalt binders and mastics. Concerning the fatigue of asphalt concrete mixture, the results of this study indicated a better convergence between the fatigue parameters of mastics and asphalt concrete mixture compared to asphalt binders, especially with increasing aging. Also, there was greater convergence between the fatigue life of the asphalt concrete mixture and asphalt binder and mastics in the method of continuum damage mechanics as compared to the phenomenological approach.

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“…According to the theory of thermal characteristics, temperature causes the aggregation state of different molecules and components of the molecular structure in asphalt to change from the glass state to the rubber state and finally to the viscous state. From Figure, polyester-based TPU-modified asphalt by DSC curves show that when the C h = 20 and C h = 30%, there are two irregular strong peaks in the melting area; the first peak is caused by imperfect hard segment crystallization, namely, the material hard segment of the arrangement was not neat which made internal hydrogen bond and the cohesion of the drops melt first (Bazmara et al, 2018), and then the crystal with a neatly arranged area began to melt. The absorption (discharge) heat peak on the DSC test curve represents the aggregation state of asphalt, with a ratio of solid to liquid.…”

Section: Dscmentioning

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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RETRACTED: Influence of thermoplastic polyurethane and synthesized polyurethane additive in performance of asphalt pavements

Cited by 113 publications

References 13 publications

Rheology-morphology relationships of new polymer-modified bitumen based on thermoplastic polyurethanes (TPU)

Rheology-morphology relationships of new polymer-modified bitumen based on thermoplastic polyurethanes (TPU)

Linking fatigue response of asphalt binders, mastics, and asphalt concrete mixture modified by nano-silica and synthesized polyurethane

Influence on Polyurethane Synthesis Parameters Upon the Performance of Base Asphalt

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