Abstract
The present study was an attempt to investigate the effect of fresh and old coal flotation waste (coal waste), used as asphalt filler and additive, on the properties of hot asphalt mixtures in aged and un-aged condition. In this experimental study, fresh and old coal flotation waste, obtained from the Central Alborz Coal Washing Plant, were used to produce filler specimens (100% Wt.) as substitutes for limestone powder and asphalt additive (7% w.t). Finally, the performance of the asphalt mixture containing flotation waste was evaluated using Marshall Stability and indirect tensile tests. The afore-mentioned compounds were used to produce specimens under short-term aging conditions and the results were compared with other results obtained under un-aged condition. The results indicate that flotation waste improved performance of hot mix asphalt under short-term aging conditions.
Highlights
The increasing demand for traffic and licit axial load calls for improvements in the materials used in pavement construction
The results showed that the use of a combination of cement kiln dust and coal waste dust can improve mechanical properties, and in some cases this improvement is more significant compared to cases where cement is added
Marshall Stability Test Studies have shown that specimen with neither too fine nor too coarse gradation show maximum strength
Summary
The increasing demand for traffic and licit axial load calls for improvements in the materials used in pavement construction. One of the main goals of pavement designers is to construct a safe, cost-effective, durable and smooth pavement that can withstand expected traffic and loads. In order to achieve this goal, experts, researchers and engineers seek pavement materials to minimize failures and enhance pavement performance [1]. Considering the high cost of road construction, studies need to be focused on accurate designs and selection of cost effective materials that can increase the efficiency and life cycle of the roads at the same time [2]. Due to reduction of natural resources, increasing development of construction and civil activities, need for energy saving and environmental impacts, researchers are looking for a good alternative for road construction materials
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