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Frontiers of Structural and Civil Engineering

Front. Struct. Civ. Eng.    2019, Vol. 13 Issue (1) : 110-122
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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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 Authors: 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.
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Lingyun YOU
Zhanping YOU
Kezhen YAN
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
layer elastic modulus (MPa) Poisson’s ratio thickness (mm) density (kg/m3)
AC overlay ? 0.25 100 2400
old AC Eh=1200a 0.25 180 2400
base 700 0.25 350 2300
subgrade 80 0.35 1800
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)
a low temperature intermediate temperature high temperature
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)
parameter definition (unit) types mean Standard deviation
transversely isotropic coefficient a input 0.625 0.2986
Max. surface deflection Uz (mm) output –303.70 9.7885
Max. shear stress s (kPa) output 144.45 4.5092
Max. shear strain e (me) output 933.75 29.1401
Tab.3  Statistical properties of input parameters and outputs at low temperature condition
parameter definition (unit) Types Mean Standard deviation
transversely isotropic coefficient a input 0.625 0.2986
Max. surface deflection Uz (mm) output –647.75 19.2922
Max. shear stress s (kPa) output 119.5 6.5383
Max. shear strain e (me) output 927.5 102.3196
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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