Crack Propagation Behavior of Asphalt Concrete; Part I: A Study into Influence of Different Materials

Abstract:

The fracture resistance of asphalt materials significantly influences the service life of asphalt pavements and consequently affects the maintenance and rehabilitation costs of the pavement network. Therefore, there is significant interest in understanding the mechanism of fracture in asphalt pavements and in developing analysis tools that would lead to the selection of asphalt materials with increased fracture resistance. Study of cracking behavior of asphalt mixtures should be conducted in a micro-scale level to have a real simulation of crack propagation. Using SIEMENS SOMATOM plus X-ray CT (computerized tomography) and multi-functional testing rig, a dynamic observation of cracking propagation of hot mix asphalt was conducted in this research. Failure process under compressive pressure was recorded using CT images and CT numbers. The direct responses in density change of Marshall Samples under a CT-compressive process are change of CT numbers. Cracking propagation in the samples can be clearly observed and failure mode and stress-strain behavior can then be simulated. The tests reported provide important theoretical fundamentals to study the cracking behavior and failure mechanism of asphalt mixtures.

• Periodical: Key Engineering Materials (Volumes 385-387)
• Pages: 297-300
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.385-387.297
• Online since: July 2008
• Authors: Tao Xie, Ze Zhong Jiang, Yan Jun Qiu, Bo Lan
• Keywords: Asphalt Concrete, Crack Propagation Behavior, CT, Material

References

[1] C.H. Kim and H-Y. Yeh, Engng Fracture Mech. 47, 569-582, (1994).

[2] M. M. J. Jacobs. Crack Growth in Asphaltic Mixes. Ph.D. Dissertation, Faculty of Civil Engineering, Delft University of Technology, Delft, (1995).

[3] Yang Gengshe, Zhang Changqing. Rock masses damage and identification. Xi'an: Shanxi Science and Technology Press, 1998, 79-90. (in Chinese).

[4] The Professional Standard of China. Specification for Design of Highway Asphalt Pavement(JTJ 014-97). Beijing: China Communications Press, 1997. (in Chinese).

[5] Tao XIE. Study on crack propagation behavior of asphalt mixtures based on CT rael-time observation. Ph.D. Dissertation, School of Civil Engineering, Southwest Jiaotong University, Chengdu, (2006).