Study on the Performance of Waste Materials in Hot Mix Asphalt Concrete
This study attempts to examine the behavior of Hot Mix Asphalt (HMA) concrete when selected waste materials, namely carbonized wood saw dust, PET and hot mix asphalt waste, are introduced and recommend suitable replacement percentages. The recommended replacement and addition rates were established by considering the Marshall properties. The results of the study reveal that, the wood saw dust carbonized in oxygen-less condition can be used to replace the traditional filler in HMA concrete up-to 2.74% of the total aggregate weight. In this study PET fibers of 30 mm length were used and up-to 2% of the total aggregate weight Marshall Properties showed an increasing trend. As the third part of the study old HMA concrete removed from 2 year old highway was tested suitability. With addition of reduced amount of bitumen satisfactory Marshall Properties were achieved. The cost reductions of 9.5% and 16.6%, compared to HMA made from virgin materials, were achieved for the case of adding carbonized wood saw dust and reusing HMA waste respectively. Cost and the additional bitumen needed for the reusing HMA waste should be based on the characteristics of the HMA waste sample.
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