Journal of Jilin University(Engineering and Technology Edition) ›› 2021, Vol. 51 ›› Issue (3): 925-935.doi: 10.13229/j.cnki.jdxbgxb20200350

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Analysis of mechanical properties of asphalt mixture affected by aggregate based on grey relational degree

Yong-chun CHENG(),He LI,Li-ding LI,Hai-tao WANG,Yun-shuo BAI,Chao CHAI   

  1. College of Transportation，Jilin University，Changchun 130022，China
  • Received:2020-05-20 Online:2021-05-01 Published:2021-05-07

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Abstract:

To analyze the influence of the content of aggregate on the mechanical properties of asphalt mixture， four grades of asphalt mixtures are prepared by Superpave gyratory compactor. The cracking resistance， compression resistance， and creep properties of the four asphalt mixtures are respectively studied by splitting tests， compression tests， and creep tests at different temperatures. Then， the variations of relaxation moduli of four grades of asphalt mixtures with the loading time are deduced by convolution integral and Laplace transform， and the creep and relaxation characteristics of four grades of asphalt mixtures are fitted and analyzed by Burgers model and second-order extensive Maxwell model. Finally， according to the grey correlation degree algorithm， the correlation degree between aggregate content and mechanical properties of asphalt mixtures is calculated， and the influence of aggregate content on the mechanical properties of asphalt mixtures is analyzed. The results show that the low-temperature cracking resistance， room temperature tensile and compressive properties of asphalt mixtures are highly related to the content of aggregate with 0.15~0.3 mm and 1.18~2.36 mm， while the creep resistance at room temperature is mainly affected by aggregate with 0.6~1.18 mm and 2.36~4.75 mm. As the temperature increases， the effect of aggregate content on the creep resistance increases. The relaxation strength is greatly affected by the fine aggregate， while the relaxation time is mainly affected by the larger aggregate.

Key words: road engineering, asphalt mixture, gradation, grey correlation degree, mechanical properties, creep, relaxation

CLC Number: 

  • U414

Table 1

Technical properties of rubber asphalt"

技术指标单位规范值试验值
针入度(25 ℃、5 s、100 g)0.1 mm60~8067.9
5 ℃延度(5 cm/min)cm≥2026.8
软化点(环球法)℃≥6576.4
25 ℃弹性恢复%≥8590.3

薄膜烘箱

老化

质量变化%≤±0.80.26
残留针入度比(25 ℃)%≥6081.5
残留延度(5 ℃)cm≥1014.4

Fig.1

Test samples prepared by core drilling"

Fig.2

Gradation of asphalt mixtures"

Fig.3

Calculation of strain energy forsplitting and compression"

Fig.4

Results of low-temperature splitting test of asphalt mixture"

Fig.5

Grey relational degree between aggregate content and low-temperature performance of asphalt mixture"

Fig.6

Results of tensile and compressive failure tests of asphalt mixture at room temperature"

Fig.7

Grey relational degree between aggregate content and room- temperature performance of asphalt mixtures"

Fig.8

Variation of creep compliance of asphaltmixture with loading time at room- andhigh-temperature"

Table 2

Fitting results of creep compliance of asphalt mixture by Burgers model"

模型参数20 ℃蠕变50 ℃蠕变
ACSUPSMAOGFCACSUPSMAOGFC
E194.7087.5676.5664.0911.5402.2510.8080.444
E25.9624.5242.2951.4332.5853.9551.4750.569
η124 958.421 216.213 287.37 590.116 803.634 420.111 127.042 53.6
η2731.9425.6154.3158.1239.0358.7113.927.9
R20.994 60.986 30.990 20.991 30.971 40.962 70.974 60.964 8

Fig.9

Grey relational degree between mineral aggregate content and creep performance of asphalt mixture"

Fig.10

Variation of relaxation modulus of asphalt mixture with loading time at room- and high-temperature"

Table 3

Fitting results of relaxation modulus of asphalt mixture by second-order extensive Maxwell model"

模型参数20 ℃松弛50 ℃松弛
ACSUPSMAOGFCACSUPSMAOGFC
G14.6882.6071.6690.9940.9291.3930.5030.237
G212.9902.8457.5281.8850.4310.6210.2120.128
ρ16550.29940.48247.58579.323276.432292.231212.327070.6
ρ281.659100.0868.40857.866143.052129.117125.51468.012
R20.9920.9490.8880.9280.9730.9710.9670.956

Fig.11

Grey relational degree between mineral aggregate content and relaxation performance of asphalt mixture"

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