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Research of Method for Solving Relaxation Modulus Based on Three-Point Bending Creep Test
Yazhen Sun1, Zhangyi Gu2, Jinchang Wang3
1School of Transportation Engineering, Shenyang Jianzhu University, Shenyang 110168, China. syz16888@126.com.
Materials (Basel, Switzerland)
|June 27, 2019
Summary
A new method accurately calculates the relaxation modulus for high viscosity asphalt sand (HVAS) using a three-point bending creep test. This research aids in understanding asphalt mixture behavior and preventing road cracks.
Area of Science:
- Civil Engineering
- Materials Science
- Rheology
Background:
- High viscosity asphalt sand (HVAS) exhibits complex viscoelastic behavior.
- Understanding relaxation modulus is crucial for predicting asphalt mixture performance and durability.
- Existing methods may not fully capture the intricate relaxation characteristics of HVAS.
Purpose of the Study:
- To develop and validate a novel numerical method for determining the relaxation modulus of HVAS.
- To accurately characterize the viscoelastic properties of HVAS using the Burgers model.
- To provide a foundation for research into road crack prevention strategies.
Main Methods:
- Developed a method involving convolution and Taylor's formula to derive a transcendental equation.
- Utilized Newton's method in Mathematica to solve for the relaxation modulus.
- Conducted laboratory three-point bending creep tests to obtain experimental data for validation.
Main Results:
- The developed numerical method showed excellent agreement with experimental results.
- The calculated relaxation moduli accurately reflected the relaxation characteristics of HVAS.
- The Burgers model parameters were successfully determined for HVAS.
Conclusions:
- The proposed method effectively studies the relaxation characteristics of asphalt mixtures.
- This research offers valuable insights for improving the long-term performance of asphalt pavements.
- The findings contribute to developing effective strategies for road crack prevention.
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