Viscoelastic Mechanical Responses of HMAP under Moving Load

Area of Science:

• Civil Engineering
• Materials Science
• Pavement Engineering

Background:

• High-modulus asphalt pavement (HMAP) requires accurate mechanical response modeling.
• Viscoelasticity of high-modulus asphalt mixture (HMAM) is critical for performance evaluation.
• Comparison with ordinary asphalt pavement highlights HMAP benefits.

Purpose of the Study:

• To represent the mechanical response laws of HMAP faithfully.
• To systematically calculate viscoelastic mechanical responses under moving loads.
• To compare HMAP performance against ordinary asphalt pavement.

Main Methods:

• Laboratory investigations using dynamic modulus and wheel tracking tests.
• Viscoelastic parameter fitting based on master curves of storage moduli.
• 3D finite element modeling (ABAQUS) of viscoelastic pavement structures under moving loads.

Main Results:

• Addition of high modulus modifiers improves high-temperature rutting resistance.
• Most mechanical responses decrease with increased dynamic moduli.
• Tensile strain and stress at the bottom layer are sensitive to modulus range, requiring restriction to avoid cracking.

Conclusions:

• HMAP exhibits superior resistance to deformation and load changes.
• Optimizing the modulus range is essential for HMAP to prevent tensile cracking.
• HMAP demonstrates enhanced durability under heavy loads.