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Influence of Failure Mechanism on the Durability of Asphalt Concrete

Saad Issa Sarsam

Abstract


Understanding the fatigue damage mechanism through fatigue process of asphalt concrete mixtures is a suitable start for the design of sustainable pavement. Mechanism of failure in the asphalt concrete may follow different sinarios when the durability issue is taken into consideration. An attempt has been taken in the present work to monitor the failure stages mechanism of asphalt concrete after practicing long term ageing and moisture damage processes. Asphalt concrete mixture was prepared with its optimum binder requirements, and compacted into a slab mold with the aid of laboratory roller. Beam specimens were obtainde from the slab samples and tested for fatigue life using three constant strain level of (750, 400, and 250) Microstrain and moderate environment of 20⁰C.  The first part of the beam specimens were denoted as the control specimen while the second part of the beam specimens were subjected to moisture damage before testing for fatigue life. The third part of the beam specimens were subjected to long term ageing process before testing for fatigue life. The test was conducted under dynamic flexural stresses with the aid of four points bending beam technique. The failure stages were monitored and analysed. It was observed that at failure, higher flexural stiffness of 2500 MPa could be detected for long term aged asphalt concrete while, lower flexural stiffness of 1250 MPa could be noticed for moisture damaged asphalt concrete. The initial flexural stiffness of asphalt concrete mixtures decline by (66.6, 78.8, and 97) % at (250, 400, and 750) constant Microstrain levels respectively after practicing moisture damage as compared with the control mixtures. However, the initial flexural stiffness of asphalt concrete mixtures increased by (3.3, 20, and 20) % at (250, 400, and 750) constant Microstrain levels respectively after practicing long term ageing as compared with the control mixtures. The two stages of failure mechanisim were not easily identified for moisture damaged and aged asphalt concrete mixtures as compared with the well defined five stages of failure mechanism for control asphalt concrete while a gentle decline in the flexural stiffness could be noticed.


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References


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