Evaluation of polyphosphoric acid on the performance of polymer modified asphalt binders

Liu, Shengjie; Zhou, Shengbo; Peng, Aihong

doi:10.1002/app.48984

Cited by 39 publications

(12 citation statements)

References 24 publications

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“…e penetration of asphalt binders with different PPA contents is displayed in Figure 1(a). e penetration values appear to present a linear decrease with increasing PPA content, which indicates an increase in asphalt binder stiffness and viscosity [18]. is change is due to the increase in asphaltene content with the addition of PPA, which is consistent with the results of fourcomponent experiments (cf.…”

Section: Penetrationsupporting

confidence: 86%

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Influence of PPA on the Short‐Term Antiaging Performance of Asphalt

Gao

Cai

et al. 2021

Advances in Civil Engineering

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It has been confirmed that polyphosphoric acid (PPA) can significantly improve the high-temperature resistance, storage stability, and aging resistance of asphalt. The low price of PPA is conducive to the development of modified asphalt with high performance and excellent economy, suggesting its great application prospects. At present, there is little research on the role of PPA in delaying the aging process of PPA-modified asphalt, and a consensus has not yet been reached. Therefore, PPA-modified asphalt with different blending amounts (0 wt%, 0.4 wt%, 0.8 wt%, and 1.2 wt%) was prepared in this study. On the basis of variable performance, the role of PPA in the short-term antiaging process of asphalt is analyzed through Fourier transform infrared spectroscopy (FTIR) analysis of PPA-modified asphalt before and after aging, combined with the analysis of the change in components. The results showed that after PPA addition, the high-temperature resistance and the thermal stability of asphalt were improved and the temperature sensitivity was weakened. Both curves of ductility and G ∗ indicate the potential saturation effect of PPA addition; together with infrared spectroscopy, we proved that there are both chemical reactions and physical mixing in the PPA-modified asphalt. The component fractions show that PPA will cause the asphalt to transform from sol to gel and the main function of PPA in retarding asphalt aging is the dispersion of the agglomerates of asphaltene micelles by PPA.

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Section: Penetrationsupporting

confidence: 86%

“…Figure 1(b) shows that the softening point of asphalt binders increased with increasing PPA content. When adding 1.2 wt% PPA, the softening point increased from 46.3°C to 58.0°C, showing that PPA has a hardening effect on asphalt, which is related to the serious transformation of asphalt structure from sol to gel [18].…”

Section: Softening Pointmentioning

confidence: 98%

Influence of PPA on the Short‐Term Antiaging Performance of Asphalt

Gao

Cai

et al. 2021

Advances in Civil Engineering

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“…Condensation of PPA modifier and degradation of SBS modifier occurred in the aging process of polymer binders. In general, more stable cross-linked network of polymer is associated with higher molecular weight for a given asphalt binder [41].…”

Section: Analysis Of Gpcmentioning

confidence: 99%

Effect of Aging on the Rheological and Molecular Weight Distribution of Asphalt Binder Treated with Polyphosphoric Acid

Yang

Shen³

2021

Advances in Materials Science and Engineering

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Asphalt binder behaves as a viscoelastic material and its inherit performance is dominated by rheological and chemical properties. Aging of asphalt binder is a prominent distress for long-term in-service asphalt pavement. In this work, the effect of aging on base asphalt modified by polyphosphoric acid (PPA) has been investigated. For the objective, virgin asphalt binder was modified by various dosages of PPA, styrene-butadiene-styrene (SBS), and PPA/SBS compound modification. The short- and long-term aging processes were simulated by Rolling Thin-Film Oven Test (RTFOT) and Pressure Aging Vessel (PAV) procedure. Rheological property of five aged modified binders was evaluated by the Dynamic Shear Rheometer (DSR). Meanwhile, gel permeation chromatography (GPC) was conducted to measure the molecular weight distribution and dispersion coefficient during the aging process. The high-temperature stiffness of PPA polymer binders is slightly higher than that of SBS and PPA/SBS compound modified asphalts. The aging ratio and molecular weight analysis verify the lower thermal-oxidative susceptibility of PPA/SBS compound modified asphalts. This study offers an understanding for the promotion and application of PPA modifier.

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“…The chemically-modified asphalt has received more focus than reactive-elastomermodified asphalt, polyphosphoric-acid-modified asphalt, and epoxy asphalt (Liu et al, 2016;Apostolidis et al, 2018;Athira et al, 2020). Polyphosphoric-acid-modified asphalt has good rutting resistance, anti-aging performance, and storage stability, but after adding polyphosphoric acid the anti-cracking property at low temperatures will be weakened (Liu et al, 2020). Epoxy asphalt has high strength, good toughness, good water resistance, temperature resistance, good fatigue resistance, and so on (Kang et al, 2015;Gong et al, 2019), but due to the high cost, it is mainly used in steel bridge deck pavement engineering (Lu and Bors, 2015).…”

Section: Introductionmentioning

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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Evaluation of polyphosphoric acid on the performance of polymer modified asphalt binders

Cited by 39 publications

References 24 publications

Influence of PPA on the Short‐Term Antiaging Performance of Asphalt

Influence of PPA on the Short‐Term Antiaging Performance of Asphalt

Effect of Aging on the Rheological and Molecular Weight Distribution of Asphalt Binder Treated with Polyphosphoric Acid

Influence on Polyurethane Synthesis Parameters Upon the Performance of Base Asphalt

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