Stress Intensity Parameter and Crack Growth of Iraqi Hot Mix Asphalt Mixtures
Keywords:Fracture toughness, Stress intensity factor, Crack, Asphalt mixtures, fracture energy, Temperature effect, Semi circular Test
The primary objective of this research is to evaluate the fracture toughness and crack propagation. To accomplish the main objectives laboratory tests on fracture parameters of asphalt mixtures are made to evaluate the potential of stress intensity factor and fracture resistance of asphaltic materials. The semi circular bending test (SCB) was carried out to achieve the objectives of this research. It can conclude that the fracture toughness increased as the test temperature decreased, which means that the HMA becomes more brittle at cold temperatures. Also the asphalt mixture with 5% binder content at (0 and 20 ) had the highest average value and also decreasing test temperature increased the critical stress intensity factor by (57.5 %). Again it can be concluded that as the temperature decrease, the fracture energy deceases but the fracture toughness increases. Also with decreasing the test temperature, the peak load increases and the total displacement decreases. The obtained results showed that peak load increased by approximately (45.95 %) and the total displacement decreases by (19 %). Also decreasing the test temperature increase the critical mouth opening displacement (CMOD) and asphalt mixture with (5%) binder had the lower critical mouth opening displacement CMOD at unstable crack.
Anderson, T. â€œFracture Mechanic: Fundamentals and Applications â€, CRC Press, and 2nd Edition, Boca Raton, Fla. (1995)
Canga, M. , Becker, E., and Ozupek, S, â€œConstitutive Modeling of Viscoelastic Materials with Damage Computational Aspectsâ€. Computer Methods in Applied Mechanics and Engineering, Vol.190, PP: 15-17. (2001).
Leslie, A., Reynaldo, R. and Bjorn, B, â€œPropagation Mechanisms for Surface- Initiated Longitudinal Wheel Path Cracksâ€. Paper Presented at the 80th Annual Meeting, TRB, Washington, D.C, USA, January 2001, 01-0433, (2001).
Marasteanu M., et. Al, â€œ Investigation of Low Temperature Cracking in Asphalt Pavementsâ€. Minnesota Department of Transportation, Research Services MS 330 /395 John Ireland Boulevard, (2007).
Huang, H.Y, â€œ Pavement Analysis and Design â€. Prentice-HALL, Englewood Cliffs, New Jersey, (1993).
Yoder, E. and Witczak, M., â€œPrinciples of Pavement Designâ€. John Wiley and Sons, New York, (1975).
Collop, A and Cebon, D, â€œA Theoretical Analysis of Fatigue Cracking in Flexible Pavementsâ€. Proceedings, Institution of Mechanical Engineers, Vol. 209, pp. 345-361, (1995).
Aggarwal, S. and Nayak, G,â€œElasto-Plastic Analysis as a Basic for Design of Cylinder Pressure Vessel with Different End Closuresâ€, Int. Journal of Pressure Vessel and Piping , Vol. 10, PP:271-269, (1982).
Osswald, T. A. and G. Menges â€œMaterials Science of Polymers for Engineersâ€. 2nd edition, Cincinnati, Ohio: Hanser Gardner Publications Inc., (2003).
Barzin and Mamlouk, M, â€œ Cracking Resistance of Asphalt Rubber Mix Versus Hot Mix Asphaltâ€. International Journal of Road Materials and Pavement Design, Vol. 5, No. 4, PP: 435-452, (2004).
Lim et. al.,â€œ Stress Intensity Factor for Semi Circular Specimens under Three Point Bendingâ€. Engineering Fracture Mechanics, Vol. 44, No. 3, (1993).
Li, X., and M. Marasteanu, â€œEvaluation of Low Temperature Fracture Resistance of Asphalt Mixture Using the Semi-Circular Bend Testâ€. Journal of the Association of Asphalt Paving Technologists, Vol. 73, (2004): 401-426, (2004).
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