Effect of anisotropic characteristics on the mechanical behavior of asphalt concrete overlay

doi:10.1007/s11709-018-0476-4

Front. Struct. Civ. Eng.

2019, Vol. 13

Issue (1) : 110-122 https://doi.org/10.1007/s11709-018-0476-4

RESEARCH ARTICLE

Effect of anisotropic characteristics on the mechanical behavior of asphalt concrete overlay

Lingyun YOU¹, Zhanping YOU¹(

), Kezhen YAN²

¹. Department of Civil and Environmental Engineering, Michigan Technological University, Houghton, MI 49931, USA
². College of Civil Engineering, Hunan University, Changsha 410082, China

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Abstract

Asphalt concrete (AC) overlays placed over old asphalt pavement have become an alternative to repairing and reinforcing pavements. The strength contributed by the AC overlay is strongly influenced by the anisotropic properties of the pavement material. This study was conducted to analyze the influence of anisotropy, modulus gradient properties, and the condition of the AC overlay and old pavement contact plane on the mechanical behaviors of AC overlays, as well as to quantify the influence of the degree of anisotropy on the mechanical behaviors of AC overlay by a sensitivity analysis (SA). The mechanical behaviors of the AC overlay were numerically obtained using the three-dimensional finite element method with the aid of ABAQUS, a commercial program. Variations in the AC overlay’s modulus as a function of temperature as well as the contact state between the AC overlay and AC layer were considered. The SA is based on standardized regression coefficients method. Comparing the mechanical behavior in terms of surface deflection, stress, and strain of the anisotropy model against those corresponding to the isotropic model under static loads show that the anisotropic properties had greater effects on the mechanical behavior of the AC overlay. In addition, the maximum shear stress in the AC overlay was the most significant output parameter affected by the degree of anisotropy. Therefore, future research concerning the reinforcement and repair of pavements should consider the anisotropic properties of the pavement materials.

Keywords asphalt concrete overlay anisotropy temperature gradients modulus gradients finite element simulation sensitivity analysis

Corresponding Author(s): Zhanping YOU

Just Accepted Date: 19 April 2018 Online First Date: 29 May 2018 Issue Date: 04 January 2019

Cite this article:

Lingyun YOU,Zhanping YOU,Kezhen YAN. Effect of anisotropic characteristics on the mechanical behavior of asphalt concrete overlay[J]. Front. Struct. Civ. Eng., 2019, 13(1): 110-122.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-018-0476-4
https://academic.hep.com.cn/fsce/EN/Y2019/V13/I1/110

Fig.1 Transverse isotropy characteristics

Fig.2 Test data of elastic modulus of asphalt concrete at different temperature condition

Fig.3 Variation of elastic modulus of AC versus depth of pavement structure

Fig.4 Illustration of the developed 3D finite element modeling. (a) Boundary conditions and double circle loads; (b) element mesh

Tab.1 Geometry and materials of pavement

Fig.5 Surface deflections at low temperature

Fig.6 Shear stresses of AC overlay at low temperature

Fig.7 Shear strains of AC overlay at low temperature

Fig.8 Surface deflections at high temperature

Fig.9 Shear stresses of AC overlay at high temperature

Fig.10 Shear strains of AC overlay at high temperature

Fig.11 Maximum surface deflection under different interlayer boundary condition (absolute value)

Fig.12 Horizontal tensile strain at the bottom of the overlay (different interlayer boundary condition)

Fig.13 Maximum surface deflection under different temperature conditions (absolute value)

Tab.2 Nephogram of surface deflections under different temperature conditions

Fig.14 Horizontal tensile strain at the bottom of overlay (different temperature conditions)

Fig.15 Vertical strain at top of subgrade (different temperature conditions)

Tab.3 Statistical properties of input parameters and outputs at low temperature condition

Tab.4 Statistical properties of input parameters and outputs at high temperature condition

Fig.16 Sensitivity analysis of the effect of anisotropic coefficients on AC overlay mechanical behaviors, i.e., Max. Surface deflection, Shear stress, and Shear strain. (a) Low temperature condition; (b) high temperature condition

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