Journal of Jilin University(Engineering and Technology Edition) ›› 2022, Vol. 52 ›› Issue (11): 2636-2643.doi: 10.13229/j.cnki.jdxbgxb20210391

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Mechanical properties of ultra⁃thin overlay considering load transfer capacity of old cement pavement joints

Fen YE1(),Shi-yuan HU2   

  1. 1.Key Laboratory of Road and Traffic Engineering of Ministry of Education，Tongji University，Shanghai 201804，China
    2.Liaoning Provincial Transportation Planning and Design Institute Co．，Ltd．，Shenyang 110166，China
  • Received:2021-04-30 Online:2022-11-01 Published:2022-11-16

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Abstract:

In order to study the mechanical characteristics of ultra-thin asphalt overlay on old cement pavement of different joint load transfer capacity， the finite element model is established to analyze the stress at the center of joint at the bottom of asphalt overlay by ABAQUS. The results show that the first principal stress increases， and the maximum shear stress and equivalent stress decrease with the increase of ultra-thin overlay thickness. The three kinds of stresses increase linearly with the increase of the ultra-thin overlay modulus and vehicle load， and decrease with the increase of the joint load transfer capacity. The interlamination contact states have significant effects on the maximum shear stress of ultra-thin overlay. The order of the influence degree of factors are as follows： vehicle load， ultra-thin overlay modulus， joint load transfer capacity， interlamination contact state， ultra-thin overlay thickness. The increase of the joint load transfer capacity can significantly improve the fatigue crack life of the ultra-thin overlay， and the relationship between them is according to power function. The joint load transfer capacity of old cement pavement should be controlled according to the traffic load before ultra-thin overlay.

Key words: road engineering, cement pavement, joint load transfer capacity, ultra-thin overlay, mechanical properties

CLC Number: 

  • U416.2

Fig.1

Relationship between modulus of virtual material layer and joint load transfer capacity"

Table 1

Modulus of virtual material layer under different joint load transfer capacity"

接缝传荷能力/%虚拟材料层模量/MPa
6017.6
6525.1
7032.8
7541.9
8075.7
85228.7
90502.5

Table 2

Calculation parameters of each structural layer"

结构层厚度/m弹性模量/MPa泊松比
超薄罩面层0.015~0.3800~1 6000.25
水泥路面0.2431 0000.15
地基91800.35

Fig.2

Variation of stress at calculation point with ultra-thin asphalt overlay thickness"

Fig.3

Variation of stress at calculation point with ultra-thin asphalt overlay modulus"

Table 3

Linear relationship between stress of 1.5 cm thick ultra-thin overlay and axle load"

接缝传荷 能力/%σ1-Fτmax-Fσe-F
kbkbkb
601.1×10-3-2×10-59.6×10-3-5×10-48.5×10-3-4×10-4
650.9×10-3-2×10-59.1×10-3-3×10-48.0×10-3-3×10-4
700.7×10-3-1×10-58.6×10-3-1×10-47.7×10-3-2×10-4
750.6×10-3-0.8×10-58.2×10-3-0.2×10-47.3×10-3-1×10-4
800.4×10-3-0.6×10-57.2×10-3-0.2×10-46.4×10-3-0.1×10-4
850.1×10-3-0.5×10-65.0×10-3-0.2×10-44.4×10-3-0.1×10-4
900.5×10-4-0.1×10-73.4×10-3-0.2×10-43.0×10-3-0.1×10-4

Table 4

Linear relationship between stress of 2.0 cm thick ultra-thin overlay and axle load"

接缝传荷 能力/%σ1-Fτmax-Fσe-F
kbkbkb
601.5×10-3-2×10-59.0×10-3-4×10-47.9×10-3-3×10-4
651.3×10-3-2×10-58.4×10-3-3×10-47.4×10-3-2×10-4
701.1×10-3-1×10-57.9×10-3-2×10-47.0×10-3-2×10-4
750.9×10-3-1×10-57.5×10-3-1×10-46.6×10-3-1×10-4
800.6×10-3-0.8×10-56.4×10-3-0.4×10-45.7×10-3-0.1×10-4
850.2×10-3-0.8×10-54.3×10-3-0.1×10-43.8×10-3-0.4×10-5
900.8×10-4-0.4×10-63.0×10-3-0.2×10-42.6×10-3-0.8×10-4

Table 5

Linear relationship between stress of 2.5 cm thick ultra-thin overlay and axle load"

接缝传荷 能力/%σ1-Fτmax-Fσe-F
kbkbkb
601.7×10-3-1×10-58.3×10-3-3×10-47.3×10-3-3×10-4
651.4×10-3-1×10-57.8×10-3-2×10-46.8×10-3-2×10-4
701.2×10-3-0.9×10-57.3×10-3-1×10-46.4×10-3-1×10-4
751×10-3-1×10-56.9×10-3-1×10-46.1×10-3-0.9×10-4
800.7×10-3-0.9×10-55.9×10-3-0.4×10-45.2×10-3-0.3×10-4
850.2×10-3-0.2×10-53.9×10-3-0.1×10-43.5×10-3-0.4×10-5
900.1×10-4-0.7×10-62.7×10-3-0.2×10-42.4×10-3-0.9×10-5

Fig.4

Variation of stress at calculation point with load transfer capacity of old cement pavement joints"

Fig.5

Stress of calculation point under different interlamination contact states"

Fig.6

Grey correlation degree of three kinds of stress and each factor"

Table 6

Fatigue cracking life of ultra-thin asphalt overlay"

超薄罩面 厚度/cm接缝传荷能力%沥青罩面层底最大水平拉应变/με疲劳开裂 寿命/次
1.560169.685 789 663
65155.408 207 794
70145.5610 641 677
75136.3213 806 559
80134.5814 531 053
2.060140.9812 077 103
65138.8912 814 872
70137.0913 497 956
75134.4314 589 640
80130.6316 349 092
2.560139.2112 700 217
65136.2913 813 686
70134.0314 765 265
75131.7615 800 350
80126.2518 719 387

Fig.7

Variation of fatigue cracking life of ultra-thin asphalt overlay"

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