Journal of Jilin University(Engineering and Technology Edition) ›› 2020, Vol. 50 ›› Issue (5): 1709-1717.doi: 10.13229/j.cnki.jdxbgxb20190611

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Viscoelasticity of hydrophobic nano⁃silica modified asphalt and asphalt mixture

Zi-wen WANG1(),Xue-dong GUO2,Wei GUO2,Meng-yuan CHANG2,Wen-ting DAI2()   

  1. 1.Changji Intercity Railway Co. Ltd. , Changchun 130021, China
    2.College of Transportation, Jilin University, Changchun 130022, China
  • Received:2019-06-17 Online:2020-09-01 Published:2020-09-16
  • Contact: Wen-ting DAI E-mail:wangziwen7007@163.com;daiwt@jlu.edu.cn

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Abstract:

In order to study the viscoelasticity of the hydrophobic nano-silica modified asphalt and its mixture, the hydrophobic nano-silica obtained by surface modification of silane coupling agent was used to modify the asphalt. Penetration test, rotational viscosity test, shear rheological test and static creep test were carried out on the modified asphalt and modified asphalt mixture. The penetration index, rotational viscosity, complex shear modulus, elastic shear modulus, viscoelastic modulus, phase angle, rutting factor, strain difference and Burgers viscoelastic parameters were evaluated for viscoelasticity. The results show that the incorporation of hydrophobic nano-silica can enhance the viscoelasticity and high-temperature stability of asphalt mixture, and improve the temperature sensing performance of asphalt and the thixotropy under normal temperature. According to the main curve analysis, in the low frequency region, the incorporation of hydrophobic nano-silica can improve the phase angle of the asphalt and enhance the elastic property of the asphalt. By analyzing the Burgers model parameters of hydrophobic nano-silica modified asphalt, it is found that the incorporation of hydrophobic nano-silica can improve the viscosity of asphalt. The results of static creep test show that the incorporation of hydrophobic nano-silica can significantly reduce the strain value of the asphalt mixture at the same temperature. In addition, the incorporation of the hydrophobic nano-silica modifier can enhance the elastic portion of the asphalt mixture, increasing viscous flow deformation and viscoelastic delayed deformation.

Key words: surface modification, hydrophobic nano-silica, viscoelasticity, dynamic shear rheology test, Burgers model

CLC Number: 

  • U416

Fig.1

Grafting mechanism of hydrophobic nanosilica"

Table 1

Technical parameter of hydrophobic nanosilica"

项目比表面积/（m2·g-1）平均粒度/nmPH值SiO2含量/%
试验结果125±20125.0~8.0≥99.8
试验标准130±30≤203.7~6.5≥99.8

Fig.2

SEM of nanosilica(X60000)"

Fig.3

SEM of hydrophobic nanosilica(X60000)"

Table 2

Technical parameters of asphalt"

技术项目试验方法实测值
针入度/（25 °C,0.1 mm）T060466.9
软化点/°CT060646.7
动力粘度/（60 °C,pa·s）T0620190
延度/（10 °C,cm）T0605≥45
蜡含量/%T06151.8
闪点/°CT0611328
密度/（25 °C,g·cm-3）T06031.030

Table 3

Gradation of AC-16 and technical parameters of fine aggregate"

参数粒径/mm
0.0750.150.30.61.18
表观相对密度/（g·cm-3）2.672.692.702.702.75
表观相对密度/（g·cm-3）2.612.622.632.652.67
表观相对密度/（g·cm-3）2.592.602.592.572.55
质量分数/%2.53.04.06.09.5

Table 4

Gradation of AC-16 and technical parameters of coarse aggregate"

参数粒径/mm
2.364.759.513.216
表观相对密度/（g·cm-3）2.742.742.782.782.78
表观相对密度/（g·cm-3）2.682.712.762.772.78
表观相对密度/（g·cm-3）2.642.682.752.762.77
质量百分率/%15271575

Table 5

Penetration of BA and SCASBA"

沥青15 °C 针入度/mm25 °C 针入度/mm30 °C 针入度/mm
BA17.563.088.1
SCASBA16.255.483.0

Table 6

Penetration index of BA and SCASBA"

沥青AKPIR2
BA0.040 260.749 49-0.043 150.998 666
SCASBA0.042 550.650 35-0.407 670.998 424

Fig.4

Viscosity-temperature curve of BA and SCASBA"

Table 7

Regression analysis results of viscosity of BA and SCASBA"

参数SCASBABA
A620.07247.726
B-0.043-0.025
R20.997 8900.988 377

Fig.5

Result of two asphalt binders at different temperatures"

Table 8

Calculation results of shift factor"

参数30 °C40 °C50 °C60 °C
αt1010.150.032 258
lgαt10-0.823 9-1.491 36

Fig.6

Master curves of BA and SCASBA"

Table 9

Burgers parameters of two asphalt binders based on DSR test"

类型E1E2η1η2
BA 30 °C2 766 4551 872 35457 345.2167 688.74
BA 40 °C1 296 750503 0258 364.7518 418.13
BA 50 °C503 299.2136 915.81 405.4145 283.488
BA 60 °C254 767.164 799.75343.002 22 266.984

SCASBA

30 °C

2 087 6961 597 64848 252.0455 364.65

SCASBA

40 °C

1 314 576423 743.27 360.99416 130.09

SCASBA

50 °C

519 572.7138 212.61 344.8555 337.711

SCASBA

60 °C

233 91077 542.2309.6722 316.33

Fig.7

Static creep strain curves of two asphalt mxitures at different temperatures"

Table 10

Strain difference of two asphalt mixtures under different loading cycles"

加载次数Δ1Δ2Δ3Δ4
11.65×10-33.36×10-37.34×10-37.98×10-3
101.62×10-32.77×10-35.45×10-36.81×10-3
1008.76×10-41.01×10-41.32×10-31.56×10-3
5005.32×10-45.54×10-46.05×10-46.94×10-4
10004.50×10-44.54×10-44.63×10-44.95×10-4
30003.53×10-43.55×10-43.61×10-43.84×10-4

Table 11

Burgers parameters of two asphalt mixtures based on static load creep test"

项目E1E2η1η2R
BA-AC(30 °C)36.5114.1627 332.33 632.80.973
SCASBA-AC(30 °C)56.062.7566 977.33 386.60.987
BA-AC(40 °C)19.783.6453 161.01 271.10.982
SCASBA-AC(40 °C)31.835.0346 585.7959.20.991
BA-AC(50 °C)15.744.3329 777.6860.70.975
SCASBA-AC(50 °C)18.715.1203 886.5356.40.991
BA-AC(60 °C)13.328.3225 465.8525.90.979
SCASBA-AC(60 °C)16.710.4163 449.7273.00.994
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