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Frontiers of Chemical Science and Engineering

ISSN 2095-0179

ISSN 2095-0187(Online)

CN 11-5981/TQ

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Front Chem Sci Eng    2011, Vol. 5 Issue (1) : 35-42    https://doi.org/10.1007/s11705-010-0551-4
RESEARCH ARTICLE
Outdoor aging of road asphalt and SBS modified asphalt
Li XIANG1, Juan TU2, Jian CHENG3,4(), Guohe QUE1
1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266555, China; 2. Hubei Guochuang Advanced Material Ltd.Co., Wuhan 430073, China; 3. Key Laboratory for Green Chemical Process of Ministry of Education, Wuhan Institute of Technology, Wuhan 430073, China; 4. Hubei Key Lab of Novel Reactor & Green Chemical Technology, Wuhan Institute of Technology, Wuhan 430073, China
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Abstract

The process of performance degradation of road asphalt (RA) is regarded as aging. At present, better understanding of the thermal-oxidative aging of asphalt is achieved and the corresponding method to evaluate this process is developed; meanwhile, photo-oxidative aging (aging in an atmospheric environment, which is referred to as “outdoor aging” in this paper) of asphalt remains at the initial stages of scientific exploration. The outdoor natural ultraviolet (UV) aging of RA and SBS modified asphalt (SBSMA) are investigated in this study. The experimental results show that the basic performances of RA and SBSMA present similar change tendencies. The softening point increased, while the penetration and ductility decreased as the outdoor aging time passed by, and the 5°C ductility (ductility measured at 5°C) of SBSMA decreased very quickly. The group components of RA and SBSMA also change during UV aging. The content of asphaltene rose and that of aromatics and saturates decreased, while the content of resins changed insignificantly. Moreover, the Fourier transform infrared (FTIR) graphs show that the content of sulfoxide and carbonyl groups in RA and SBSMA increased significantly during the outdoor aging process.
Keywords asphalt      SBS      modified road asphalt      outdoor aging      ultraviolet     
Corresponding Author(s): CHENG Jian,Email:wuhancengjian@163.com   
Issue Date: 05 March 2011
 Cite this article:   
Li XIANG,Juan TU,Jian CHENG, et al. Outdoor aging of road asphalt and SBS modified asphalt[J]. Front Chem Sci Eng, 2011, 5(1): 35-42.
 URL:  
https://academic.hep.com.cn/fcse/EN/10.1007/s11705-010-0551-4
https://academic.hep.com.cn/fcse/EN/Y2011/V5/I1/35
itemsRASBSMA
penetration (25°C, 100 g, 5 s, 0.l mm)67.359.9
ductility (5°C, 5 cm/min, cm)4.846.2
ductility (15°C, 5 cm/min, cm)>15085.2
softening point (ring and ball, °C)50.862.9
elastic recovery (25°C, 10 cm, 60 min, %)--93
TFOT residuum
?mass loss (%)0.070.06
?penetration (25°C, 100 g, 5 s, 0.l mm)46.250.9
?ductility (5°C, 5 cm/min, cm)--25.7
?ductility (15°C, 5 cm/min, cm)10150.8
?softening point (ring and ball, °C)53.365.4
?5°C ductility ratio (%)--55.6
?25°C penetration ratio (%)68.685.0
Tab.1  Basic properties of Zhonghai 70# RA and SBSMA
samples25°C penetration /(0.1 mm)ratio of penetration a) /%15°C ductility /cmratio of ductility a) /%softening point /°C
RA66.2-->150--50.8
TFOT46.2100.0101.0100.053.3
3 months outdoor aging27.860.26.26.159.3
6 months outdoor aging21.245.93.73.764.4
9 months outdoor aging15.734.00.30.365.7
12 months outdoor aging12.026.00--65.8
Tab.2  Performances of RA pre and post outdoor aging
samples25°C penetration / (0.1 mm)ratio of penetration a) /%5°C ductility /cm15°C ductility /cmratio of 15°C ductility a) /%softening point /°C
SBSMA59.9--46.285.2--62.9
TFOT50.9100.025.750.8100.065.4
3 months outdoor aging31.361.5016.432.366.5
6 months outdoor aging25.750.509.819.370.0
9 months outdoor aging21.642.409.819.370.6
12 months outdoor aging19.137.508.917.571.6
3 months simulated agingb)40.078.616.3----65.2
Tab.3  Performances of SBSMA pre and post outdoor aging
Fig.1  Variations of penetration ratio of RA and SBSMA post TFOT and outdoor aging
samplesasphaltenes /%saturates /%aromatics /%resins /%Ic
RA9.0813.3749.2728.280.2895
TFOT10.9313.4646.5329.080.3226
3 months outdoor aging14.0311.7341.9930.790.3539
6 months outdoor aging16.2411.5838.8730.230.4026
9 months outdoor aging16.4311.6837.8830.770.4095
3 months simulated aging a)12.9412.3344.8129.920.3382
SBSMA14.0612.6846.3626.900.3650
TFOT15.9912.4944.9826.540.3982
3 months outdoor aging17.6711.2139.9128.090.4247
6 months outdoor aging19.2110.4738.9728.070.4427
9 months outdoor aging19.4311.3737.7328.330.4662
3 months simulated aging a)16.0012.6044.3925.490.4093
Tab.4  Group components analysis of RA and SBSMA pre and post outdoor aging
Fig.2  Fluorescence microscope micrographs at 10 × 20 magnification of SBSMA (a) original sample; (b) sample with TFOT; (c) outdoor aging with 6 months; (d) outdoor aging with 12 months
Fig.3  FTIR spectrographs of RA (a) and SBSMA (b)
Fig.4  FTIR spectrographs of RA and SBSMA pre and post outdoor aging
(a) RA; (b) SBSMA; 0 post TFOT; 1 outdoor aging with 3 months; 2 outdoor aging with 6 months; 3 outdoor aging with 9 months
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