Studying the Possibility of Reusing Recycled Gravel in Hot Mix Asphalt

الملخص

Due to harsh climatic conditions or natural or human disasters, especially with the conditions of war in our country ,Syria, and the sabotage operations against residential facilities, government in situations, infrastructure, etc. …..Concrete structures are exposed to a demolition movement which leads to  accumulation of large quantities of waste, of which concrete is a large part.

This research sheds light on the possibility of benefiting from construction and demolition waste and the studies that have been carried out in this field, as the technique of reusing the waste of demolished concrete facilities is considered out dated in some countries that are exposed to harsh climatic conditions, high or low temperatures, or that have been exposed to natural disasters, volcanoes and earthquakes, and modern in some countries, which witnessed an urban renaissance as big as the gulf countries as a result of the increase in oil exports and the economic growth of these countries.

As recycling and treating the crushed concrete components and adding them to new concrete on asphalt mixtures reduces the need for large quantities of new components and thus reduces the demand for natural quarries, and this in turn preserves as much as possible the materials that may be needed by future generations, and it is considered a way to reduce construction costs, and reduce as much as possible environmental pollution. The research reached important results showing that the surfaced roughness of the grains requires the use of a relatively high bond ratio of up to 5.75%, and that the produced asphalt mixture achieves the minimum required for stability, and achieves a runny value equal to 2,5 mm, which is acceptable, but it is considered relatively low compared to the high bond ratio. The percentage of air spaces was acceptable and the degree of filling was acceptable, but it was low compared to the ratio of the bond.