Title page for ETD etd-06212011-152105


Type of Document Dissertation
Author Wang, Dong
Author's Email Address wangd@vt.edu
URN etd-06212011-152105
Title A micro-scale method to associate the fatigue properties of asphalt binder, mastic and mixture
Degree PhD
Department Civil Engineering
Advisory Committee
Advisor Name Title
wang, Linbing Committee Chair
Batra, Romesh C. Committee Member
Dove, Joseph E. Committee Member
Sotelino, Elisa D. Committee Member
Keywords
  • Asphalt mixture
  • Fatigue
  • X-ray Tomography
  • Finite Element Method
Date of Defense 2011-02-25
Availability restricted
Abstract
The fatigue damage is one of the most common distresses observed on the asphalt concrete

pavement. The initiation and propagation of the fatigue damage is a complicated phenomenon

and very difficult to detect. In order to thoroughly understand the fatigue of asphalt concrete, the

behaviors of the key components of asphalt concrete under cyclic loading are investigated

respectively. A new experiment method is developed to test the performances of asphalt binder,

mastic and mixture under cyclic loading, which provides a tool to unify the fatigue test method

for both binding medium and asphalt mixture. Using the new fatigue test method, the effects of

loading magnitude, temperature and loading rate to the performance of the asphalt binder under

cyclic loading are estimated. Mastic and mixture specimens are prepared by adding fillers and

controlled-size aggregates into the asphalt binder. The effects of filler content to the performance

of mastic specimen are discussed. The differences between the test results of mastic and mixture

are compared and analyzed. Incorporated with the new fatigue test, x-ray tomography system is

used in this study to: 1. Analyze the structure change of the mastic specimen before and after the

fatigue test. 2. Compare the void content differences between the mastic and mixture specimens.

3. Reconstruct the 3-D internal structures of mastic and mixture specimens to build up the digital

specimens. The digital specimens are used in the fatigue simulation of the asphalt binder, mastic

and mixture specimens based on the finite element method. The asphalt binder, filler and

aggregate are treated as different materials. Damage parameter is introduced to model the

degradation of elastic modulus of the asphalt binder caused by fatigue damage. Direct cyclic

analysis available in ABAQUS is used to obtain the response of the material after large number

of loading cycles. The basalt fibers are dispersed into the asphalt binder and mastic specimens,

the effects of the basalt fiber to the performances of the binder and mastic at low temperature are

analyzed using both experimental and FEM modeling methods.

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