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Frontiers of Structural and Civil Engineering

ISSN 2095-2430

ISSN 2095-2449(Online)

CN 10-1023/X

Postal Subscription Code 80-968

2018 Impact Factor: 1.272

Front. Struct. Civ. Eng.    2023, Vol. 17 Issue (4) : 625-636    https://doi.org/10.1007/s11709-023-0938-1
RESEARCH ARTICLE
Aging properties and aging mechanism of activated waste rubber powder modified asphalt binder based on rheological properties and micro-characterization
Peipei KONG1, Gang XU1, Liuxu FU1, Xianhua CHEN1(), Wei WEI2
1. School of Transportation, Southeast University, Nanjing 211189, China
2. School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China
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Abstract

The research and development of high-performance pavement materials has been intensified owing to the demand for long-life pavements. This study is performed to develop a novel pavement material using waste rubber powder, waste lubricating by-product (LBP), and asphalt. Subsequently, the aging properties and aging mechanism of activated waste rubber powder modified asphalt (ARMA) are investigated based on its rheological properties and micro-characterization. The rheological results show that, compared with waste rubber powder modified asphalt (RMA), ARMA offers a higher aging resistance and a longer fatigue life. A comparison and analysis of the rheological aging parameters of ARMA and RMA show that LBP activation diminishes the aging sensitivity of ARMA. The micro-characterization result shows that the aging of ARMA may be caused by the fact that LBP-activated waste rubber powder is more reactive and can form a dense colloidal structure with asphalt. Therefore, the evaporation loss of asphalt light components by heat and the damage to the colloidal structure by oxygen during the aging process are impeded, and the thermal-oxidative aging resistance of ARMA is improved.

Keywords rubber powder modified asphalt      aging      mechanism      rheological      characterization     
Corresponding Author(s): Xianhua CHEN   
About author:

* These authors contributed equally to this work.

Just Accepted Date: 10 February 2023   Online First Date: 19 May 2023    Issue Date: 25 June 2023
 Cite this article:   
Peipei KONG,Gang XU,Liuxu FU, et al. Aging properties and aging mechanism of activated waste rubber powder modified asphalt binder based on rheological properties and micro-characterization[J]. Front. Struct. Civ. Eng., 2023, 17(4): 625-636.
 URL:  
https://academic.hep.com.cn/fsce/EN/10.1007/s11709-023-0938-1
https://academic.hep.com.cn/fsce/EN/Y2023/V17/I4/625
itemmeasured value
sulfur content (%)< 0.08
aromatic content (%)80
flash point (°C)≥ 200
specific gravity (20 °C)1.02
aniline point (°C)< 32
appearancebrown
Tab.1  Physical properties of LBP
itemmeasured value
rubber content (%)53.28
carbon black content (%)32.06
acetone extractive (%)4.87
ash (%)6.28
fiber content (%)0.42
metal content (%)0.02
density (g/cm3)1.07
Tab.2  Main technical specifications of waste rubber powder
Fig.1  Preparation procedures of ARMA/RMA.
test itemvalue
70# asphaltRMAARMA
penetration at 25 °C (0.1 mm)61.252.458.6
softening point (°C)56.862.760.9
ductility at 5 °C (cm)> 10010.613.7
135 °C viscosity (Pa?s)0.516.86.2
segregation softening point difference (°C)?7.64.5
superpave asphalt binder gradePG 64?16PG 82?22PG 76?28
Tab.3  Technical specifications of 70# asphalt, ARMA, and RMA
Fig.2  (a) Complex modulus and (b) phase angle of ARMA and RMA vs. frequency at 60 °C.
Fig.3  (a) G*/sinδ and (b) G*·sinδ values of ARMA and RMA vs. frequency at 60 °C.
Fig.4  LAS parameters: (a) damage intensity and (b) fatigue life of ARMA and RMA with different aging levels.
Fig.5  Changes in rheological aging index before and after ARMA and RMA aging: (a) GAI; (b) PAI; (c) RAI; (d) FAI; (e) CAI.
Fig.6  (a) Saturate content; (b) aromatic content; (c) resin content; (d) asphaltene content of 70# asphalt, RMA, and ARMA with different aging degrees.
functional groupabsorption peak wavenumber (cm?1)
CH3 stretch2926
CH2 stretch2850
C=O stretch1700
C=C stretch1603
CH2 bend1457
CH3 bend1376
S=O stretch1030
Tab.4  FT-IR absorption peaks of ARMA and RMA
Fig.7  (a) FT-IR spectra of ARMA and RMA with different aging degrees; (b) regional FT-IR spectra of ARMA and RMA with different aging degrees.
Fig.8  CAI, SAI, and BAI values of modified asphalt under different aging conditions.
Fig.9  Thermal aging mechanism of (a) RMA; (b) ARMA.
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