Study on the Aging Resistance of Polyurethane Precursor Modified Bitumen and its Mechanism

As an environmentally friendly alternative for the production of high-performance modified asphalt by chemical reactions, a liquid-state polyurethane-precursor-based reactive modifier (PRM) was developed and employed in the asphalt modification. In contrast to the traditional solid bitumen modifier, for example, rubber and thermoplastic elastomers, the PRM as a liquid modifier has more significant advantages in reducing energy consumption and improving asphalt performance, which has attracted widespread attention. However, the aging resistance and its mechanism are not clear. In view of this, the aging performance of two PRM-modified bitumen (PRM-70 and PRM-90), under the short-term thermo-oxidative aging, long-term thermo-oxidative aging, and ultraviolet (UV) aging conditions, was investigated through chemical and mechanical methods. The results show that the PRM-90 is more susceptible to the thermos-oxidative aging and UV aging. The use of low-penetration-grade bitumen and ensuring an adequate reaction are beneficial to enhance the aging resistance of PRM-modified bitumen. The impact of aging on high-temperature performance of PRM-modified bitumen is great, followed by the low-temperature performance and the anti-fatigue performance. The mechanic-relevant rheological aging index (RAI) and fracture energy index (FEI) are recommended to evaluate aging properties for PRM-modified bitumen. This study not only provides support for further research on the relationship between the aging properties and mechanical performance of PRM-modified bitumen, but also provides a reference for conducting mechanism analysis.

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Investigation of UV Absorber Residue Improving Aging Properties of Bitumen

Materials Science Forum ◽

10.4028/www.scientific.net/msf.847.413 ◽

2016 ◽

Vol 847 ◽

pp. 413-417 ◽

Cited By ~ 2

Author(s):

Li Gao ◽

Jian Ying Yu ◽

Min Wu ◽

Li Hui Xue

Keyword(s):

Aging Process ◽

Retention Rate ◽

Modified Bitumen ◽

Uv Aging ◽

Oxidative Aging ◽

Uv Absorber ◽

Aging Index ◽

Modify Bitumen ◽

Aging Properties ◽

Aging Resistance

Ultraviolet (UV) absorber residue was used to modify bitumen. Effects of UV absorber residue on thermo-oxidative and UV aging properties of bitumen were evaluated by conventional physical properties and SARA (saturates, aromatics, resins and bitumenenes) analysis. The results showed that the viscosity aging index (VAI) and softening point increment (SPI) of bitumen decreased significantly due to introduction of the UV absorber residue, and the ductility retention rate (DRR) was evidently higher compared to the pristine bitumen. SARA show that UV absorber residue can effectively restrain the gelatinization of bitumen resulted from aging. As a consequence, the UV absorber residue modified bitumen displays enhanced aging resistance properties, which can be attributed to the physical sorption of activated carbon to lighter components in the thermo-oxidative aging process and the absorption of UV absorption residue to the ultraviolet light in the process of UV aging.

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Investigating the influence of carbon nanotube on the performance of asphalt binder

Progress in Rubber Plastics and Recycling Technology ◽

10.1177/14777606211019413 ◽

2021 ◽

pp. 147776062110194

Author(s):

Peerzada Mosir Shah ◽

Mohammad Shafi Mir

Keyword(s):

High Temperature ◽

Asphalt Binder ◽

Storage Condition ◽

Modified Bitumen ◽

Creep And Recovery ◽

Low Viscosity ◽

Temperature Performance ◽

Modified Asphalt Binder ◽

Viscosity Grade ◽

The Impact

The purpose of this study aims at investigating the impact of multi-walled carbon nanotubes (MWCNT’s) on the properties of low viscosity grade asphalt binder. Asphalt binder with viscosity grade-10 is selected as the control binder and later it is modified with different percentages of MWCNT’s (0.5–2.5%). Penetration, softening point, ductility and rotational viscosity test were employed for evaluating the effect of MWCNT’s on basic physical properties of modified asphalt binder. Dynamic Shear Rheometer (DSR) is used for evaluating the rheological properties of the base and modified bitumen, for both aged and unaged bitumen. Based on the conventional and basic rheological tests, it was seen that the addition of MWCNT’s improved the high-temperature performance of modified bitumen. Multiple Stress Creep and Recovery (MSCR) test results revealed that the addition of MWCNT’s improved the creep and recovery of modified binders for both stress intensities (0.1 kPa and 3.2 kPa) which confirms that the modified binder is more rut resistant. Moreover, it was observed that there was a significant improvement in the aging resistance of the asphalt binder due to addition of MWCNTs. However low temperature performance of MWCNTs was not encouraging. Also, MWCNTs addition to asphalt binder was found to be stable under high-temperature storage condition. Overall, there is a significant amount of improvement using MWCNTs in the base asphalt binder.

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THE INFLUENCE OF POLYMER ON RHEOLOGICAL AND THERMO OXIDATIVE AGING PROPERTIES OF MODIFIED BITUMEN BINDERS

Jurnal Teknologi ◽

10.11113/jt.v79.10180 ◽

2017 ◽

Vol 79 (6) ◽

Cited By ~ 3

Author(s):

Nura Bala ◽

Ibrahim Kamaruddin ◽

Madzlan Napiah

Keyword(s):

Softening Point ◽

Storage Stability ◽

Elastic Behavior ◽

Modified Bitumen ◽

Oxidative Aging ◽

Modified Binders ◽

Aging Resistance ◽

Lower Temperature ◽

Modified Binder ◽

Temperature Susceptibility

Polymer modified bitumen (PMB) has been used for many years to improve the performance of asphalt concretes against premature pavement defects. In this research, modified samples were prepared with 2%, 3%, 4%, 5% and 6% Linear Low Density Polyethylene (LLDPE) polymer by weight of bitumen binder. The influence of LLDPE polymer was evaluated through binder properties test which includes penetration, softening point, storage stability, temperature susceptibility, rutting, fatigue and thermal oxidative aging resistance from a dynamic shear rheometer (DSR) measurements at a temperature of 20 OC to 60 OC. Results show that LLDPE polymer has a significant effect on binder properties. Penetration decreases and softening point increases with increasing LLDPE content on the modified binder after aging, which implies LLDPE improves the thermo oxidative aging resistance of the binder. Furthermore, the storage stability test shows that at higher LLDPE concentrations phase separation may occur. DSR analysis shows that modified binders have lower temperature susceptibility and higher aging resistance with increased stiffness and elastic behavior compared with unmodified binders. In addition, modified binders show enhanced resistance against high temperature rutting and at low temperature fatigue performance. It was found that the optimum LLDPE content is 6%.

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UV Aging Performance of Asphalt Containing LDHs

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.599.265 ◽

2014 ◽

Vol 599 ◽

pp. 265-270 ◽

Cited By ~ 1

Author(s):

Pan Fei Liu ◽

Jun Zheng ◽

Shao Peng Wu

Keyword(s):

Aging Process ◽

Complex Modulus ◽

Short Term ◽

Uv Aging ◽

Oven Test ◽

Aging Properties ◽

Aging Resistance ◽

Before And After ◽

Double Hydroxides

In this paper the effect of Layered double hydroxides (LDHs) on aging properties of asphalts was studied. The thin film oven test TFOT tests and ultraviolet (UV) aging process were used to simulate short-term and long-term aging of asphalts, respectively. After aging, the physical properties and dynamic shear rheological behaviors of LDHs modified asphalts were investigated. The viscosity of LDHs modified asphalts was measured by Brookfield viscometer before and after UV aging. After UV aging, with an increase of LDHs, softening point and viscosity value of modified asphalts decreased, while both of ductility and penetration increased, compared to base asphalts. Temperature sweep tests showed that the complex modulus of LDHs modified asphalts was lower than that of base asphalt, while phase angle was higher. The results showed that LDHs improved the UV aging resistance of the asphalt, and it could prevent asphalt from UV aging.

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Performance Evaluation of SBS Modified Bituminous Roofing Membrane Containing Layered Double Hydroxides

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.599.203 ◽

2014 ◽

Vol 599 ◽

pp. 203-207

Author(s):

Song Xu ◽

Wei Dan ◽

Wen Zu Li ◽

Jian Ying Yu

Keyword(s):

Layered Double Hydroxides ◽

Melt Blending ◽

Modified Bitumen ◽

Oxidative Aging ◽

Aging Resistance ◽

Waterproofing Membrane ◽

Low Temperature Flexibility ◽

Thermal Oxidative Aging ◽

Double Hydroxides ◽

Over Time

Layered double hydroxides (LDHs)/SBS modified bitumens used for waterproofing membrane were prepared by melt blending using various contents of SBS and LDHs. Effects of the LDHs on physical properties and thermal oxidative aging performance of modified bitumen were investigated. The results show that softening point and low temperature flexibility of LDHs/SBS modified bitumen are increased simultaneously with the rise of SBS content, while they are little affected by the change of LDHs content. The thermal oxidative aging resistance of SBS modified bitumen is gradually improved with increasing LDHs content. In addition, the aging rate of SBS modified bitumen with LDHs are evidently lower than that without LDHs over time, which indicates that LDHs improve the ability of SBS modified bitumen to resist the thermal oxidative aging effectively.

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Artificial and Natural Aging of Polypropylene Used in Passenger Vehicle Bumpers

Materiale Plastice ◽

10.37358/mp.21.2.5492 ◽

2021 ◽

Vol 58 (2) ◽

pp. 201-210

Author(s):

Hongshen Zhang ◽

Hongfei Zheng

Keyword(s):

Accelerated Aging ◽

Natural Aging ◽

Short Term ◽

Uv Aging ◽

Accelerated Aging Test ◽

Aging Test ◽

Wide Range ◽

Aging Properties ◽

Materials Used ◽

The Impact

Polypropylene (PP) has a wide range of applications in the automobile bumpers due to its many excellent properties. Mechanical properties of PP for automobile bumpers are investigated through an artificial accelerated aging test. The aging rules after different years of normal use and the artificial accelerated aging test are analyzed. The correlation between natural and artificially accelerated aging is also explored. It provides a reference for the study of the aging properties of polymers for automotive applications. Results show that the UV aging test can effectively simulate changes in tensile and bending strengths after natural aging and can be used to evaluate the weathering resistance of PP materials used in automotive bumpers. The tensile and bending strengths of these materials remain good during aging, and elongation is sensitive to aging. The short-term artificial accelerated aging test does not exert a significant influence on the impact strength of materials, and artificial accelerated aging does not completely reproduce the aging process of the material.

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Optical and UV-Aging Properties of LDH-Modified Bitumen

Materials ◽

10.3390/ma8074022 ◽

2015 ◽

Vol 8 (7) ◽

pp. 4022-4033 ◽

Cited By ~ 13

Author(s):

Xing Liu ◽

Shaopeng Wu ◽

Gang Liu ◽

Liping Li

Keyword(s):

Modified Bitumen ◽

Uv Aging ◽

Aging Properties

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Effect of Warm Mix Agent on Physical and Aging Properties of Crumb Rubber Modified Bitumen

Materials Science Forum ◽

10.4028/www.scientific.net/msf.944.1226 ◽

2019 ◽

Vol 944 ◽

pp. 1226-1233

Author(s):

Rong Hua Zhuang ◽

Jian Ying Yu ◽

Heng Chang ◽

Yan Zeng ◽

Xue Yong Lan

Keyword(s):

Thermal Oxidation ◽

Temperature Stability ◽

Crumb Rubber ◽

Carbonyl Groups ◽

High Temperature Stability ◽

Short Term ◽

Modified Bitumen ◽

Uv Aging ◽

Aging Properties

The effects of modified natural zeolite warm mix agent (MNZWMA) and organic viscosity reducing warm mix agent (OVRWMA) on the physical properties, short term thermal oxidation aging, long term thermal oxidation aging and UV aging properties of the crumb rubber modified bitumen (CRMB) were investigated. The results showed that MNZWMA and OVRWMA could improve the high temperature stability and the low temperature crack resistance of CRMB, respectively. During the short term thermal oxidation aging, long term thermal oxidation aging and UV aging, OVRWMA increased softening point increment (SPI) and viscosity aging index (VAI) of CRMB, however, MNZWMA decreased its SPI and VAI. The analysis of FTIR spectra indicated that MNZWMA reduced the formation of carbonyl groups and sulfoxide groups, but OVRWMA accelerated the formation of carbonyl groups and sulfoxide groups to some extent during ultraviolet aging. Therefore, MNZWMA could improve the anti-aging properties, and OVRWMA was not conducive to the anti-aging properties of CRMB.

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Effect of Non-Sulfur Stabilizer on Performance of SBS Modified Bitumen

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1035.944 ◽

2021 ◽

Vol 1035 ◽

pp. 944-950

Author(s):

Zhao Yang Liu ◽

San Peng Mao ◽

Gui Tao Zheng ◽

Zhi Long Cao ◽

Lian Li ◽

...

Keyword(s):

Low Temperature ◽

Aging Process ◽

Storage Stability ◽

Growth Index ◽

Thermal Storage ◽

Cross Linking ◽

Modified Bitumen ◽

Temperature Performance ◽

Aging Resistance ◽

Low Temperature Flexibility

Based on the reason that SBS modified bitumen (SMB) with sulfur stabilizer is easy to degrade during aging, a novel non-sulfur stabilizer, P-benzoquinone oxime (GMF), was used to modify SMB. The effects of GMF and sulfur stabilizer on the thermal storage stability, low-temperature performance and aging resistance of SMB were investigated. The results indicate that GMF is more beneficial to improve the thermal storage stability, the low temperature flexibility and softening point of SMB than that of sulfur. And GMF can restrain the degradation of the low temperature flexibility of SMB after thermal aging as compared with sulfur. Fourier transform infrared spectroscopy indicates that the aging growth index of GMF/SBS modified bitumen is 33.5% lower than that of sulfur/SBS modified bitumen after aging. Fluorescence microscope proves that the addition of GMF can prevent the destruction of cross-linking network structure of SBS in bitumen during aging process, which also demonstrates that GMF can improve the aging resistance of SMB. Therefore, GMF can be more suitable as a stabilizer for SMB.

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