Investigation of UV Absorber Residue Improving Aging Properties of Bitumen

2016 ◽  
Vol 847 ◽  
pp. 413-417 ◽  
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.

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

2021 ◽  
Vol 13 (17) ◽  
pp. 9520
Author(s):  
Liang Zhang ◽  
Pengfei Li ◽  
Guanfeng Hu ◽  
Sufeng Zhang ◽  
Bin Hong ◽  
...  
Keyword(s):  
Mechanical Performance ◽  
Thermoplastic Elastomers ◽  
Modified Bitumen ◽  
Uv Aging ◽  
Oxidative Aging ◽  
Temperature Performance ◽  
Mechanical Methods ◽  
Aging Properties ◽  
Aging Resistance ◽  
The Impact

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.

UV Aging Performance of Asphalt Containing LDHs

2014 ◽  
Vol 599 ◽  
pp. 265-270 ◽  
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.

Investigation of Anti-UV Aging of Bitumen Modified with Layered Double Hydroxides

2014 ◽  
Vol 599 ◽  
pp. 187-192 ◽  
Author(s):  
Xiao Juan Jia ◽  
Jian Ying Yu ◽  
Song Xu ◽  
Wei Dan ◽  
Li Hui Xue
Keyword(s):  
Layered Double Hydroxides ◽  
Chemical Compositions ◽  
Ftir Analysis ◽  
Modified Bitumen ◽  
Uv Aging ◽  
Aging Index ◽  
Modify Bitumen ◽  
Penetration Ratio ◽  
Double Hydroxides ◽  
Changing Rate

Layered double hydroxides (LDHs) were used to modify bitumen. Effect of LDHs on physical properties and chemical compositions of bitumen was investigated. Fourier transform infrared (FTIR) spectroscopy was carried out to analyze the structural change of LDHs modified bitumen after UV aging. The results show that LDHs is effective in improving the UV aging resistance of bitumen since the viscosity aging index (VAI) and softening point increment (SPI) of bitumen decrease while the retained penetration ratio (RPR) increases with increasing LDHs contents. The carbonyl and sulfoxide of LDHs modified bitumen presented a smaller increase after UV aging in comparison with unmodified bitumen according to FTIR analysis, and the changing rate of carbonyl and sulfoxide index of aromatics and asphaltenes reduced obviously compared with the slight changes of saturates and resins after the introduction of LDHs during UV aging, which demonstrated that LDHs mainly inhibit the oxidation of aromatics and asphaltenes during the UV aging.

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

2017 ◽  
Vol 79 (6) ◽  
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%.

The temperature effects in aging index of asphalt during UV aging process

2015 ◽  
Vol 93 ◽  
pp. 1125-1131 ◽  
Author(s):  
Wenbo Zeng ◽  
Shaopeng Wu ◽  
Jin Wen ◽  
Zongwu Chen
Keyword(s):  
Temperature Effects ◽  
Aging Process ◽  
Uv Aging ◽  
Aging Index

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

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.

scholarly journals Effect of Zn/Al Layered Double Hydroxide Containing 2-Hydroxy-4-n-octoxy-benzophenone on UV Aging Resistance of Asphalt

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
Chao Peng ◽  
Jianying Yu ◽  
Jing Dai ◽  
Jian Yin
Keyword(s):  
Layered Double Hydroxide ◽  
Uv Light ◽  
Asphalt Binder ◽  
Synergetic Effect ◽  
Uv Aging ◽  
Modified Asphalt ◽  
Uv Absorber ◽  
Aging Resistance ◽  
Double Hydroxide ◽  
Sbs Modified Asphalt

UV radiation is a main factor to reduce the service life of asphalt pavement due to the UV aging of asphalt binder. To obtain enhanced UV aging resistance, an organic UV absorber called 2-hydroxy-4-n-octoxy-benzophenone (HNOB) had been intercalated into an inorganic UV absorber called Zn/Al layered double hydroxide (LDH) to play a combined anti-UV role in asphalt binder. Fourier transform infrared spectroscopy revealed that HNOB anions have been intercalated into the interlayer galleries of Zn/Al-LDH containing HNOB anions (Zn/Al-HNOB−-LDH). X-ray diffraction results of Zn/Al-LDH containingCO32−anions (Zn/Al-CO32--LDH) andZn/Al-CO32--LDH/styrene-butadiene-styrene (SBS) modified asphalt disclosed that asphalt molecules entered into LDH interlayer galleries to form an expanded phase structure. UV-Vis absorbance patterns showed that Zn/Al-HNOB−-LDH has a better capacity of blocking UV light due to the synergetic effect of HNOB and Zn/Al-LDH. The chemical fractions analysis, conventional physical tests, and rheological tests of SBS modified asphalt,Zn/Al-CO32--LDH/SBSmodified asphalt, and Zn/Al-HNOB−-LDH/SBS modified asphalt before and after UV aging testified that Zn/Al-HNOB−-LDH can improve the UV aging resistance of SBS modified asphalt more significantly.

scholarly journals Optical and UV-Aging Properties of LDH-Modified Bitumen

Materials ◽  
2015 ◽  
Vol 8 (7) ◽  
pp. 4022-4033 ◽  
Author(s):  
Xing Liu ◽  
Shaopeng Wu ◽  
Gang Liu ◽  
Liping Li
Keyword(s):  
Modified Bitumen ◽  
Uv Aging ◽  
Aging Properties

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

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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