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Influence of Coal Fly Ash in Enhancing the Durability of Asphalt Concrete

Saad Issa Sarsam

Abstract


Fly ash is a byproduct of coal combustion; its sustainable properties may be used to enhance the durability of asphalt concrete pavement. An attempt has been made in the present investigation to assess the influence of (coal fly ash of class F) on the durability of asphalt concrete in terms of long term ageing. Beam specimens were obtained from roller compacted slab samples. The slab samples were prepared at optimum binder and fly ash requirements, and subjected to dynamic flexural stresses with the aid of four points bending beam test. Three constant strain levels of (750, 400, and 250) microstrain have been implemented to represent various loading sequences in the field. The test was conducted at 20℃ environment. The fluctuation of the initial stiffness percentage among loading period was monitored. It was observed that the fatigue life of the fly ash modified asphalt concrete is higher than that of the control mixture by (0.5, 3, and 0.25) folds. However, the fatigue life of the fly ash modified asphalt concrete before ageing is higher than those after ageing by (2.3, 3, and 1.5) folds. It was concluded that at 250, 400, and 750 microstrain levels, the initial stiffness of aged fly ash modified asphalt concrete fluctuate between (100-50) %, (140-18) %, and (118-56) % until reaching failure after practicing dynamic flexural stresses. It was recommended that coal fly ash can enhance the flexural properties of asphalt concrete when practicing ageing.


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