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Influence of Coal Fly Ash on the Failure Mechanism of Aged Asphalt Concrete
Abstract
Additives to asphalt binder can control the rheological, physical, and performance of asphalt concrete mixture. In this work, coal fly ash was implemented as additive to modify the 40-50 penetration grade asphalt binder. Control and fly ash modified Asphalt concrete mixture were prepared with optimum binder content, then, compacted in a slab mold by laboratory roller. Pillar examples were gotten from the chunk tests and exposed to long haul maturing. The specimens were subjected to dynamic flexural stresses and tested for fatigue life at 20℃ using three levels of constant strain (250, 400, and 750) Microstrain. It was observed that the fly ash additive was able to retain the flexural stiffness of asphalt concrete at early stages of loading by changing the failure stages mechanism, and extend the fatigue life of the modified mixtures as compared with the control specimens. After long term ageing, the fly ash modified asphalt concrete mixture exhibit significant control on the rate of decline in the flexural stiffness and failure mode of asphalt concrete.
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