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 TestAbstract
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.
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