Asphalt is a petroleum product. it comes from slowly heating or refining crude oil till it begins to separate. with propain being the lightest rising to the top and liquefied asphalt being the heaviest falling to the bottom. Gasoline, diesel thinners and other products all being suspended in the middle. The liquified asphalt is mixed with aggragate ( rock, and sand ) to create hot mix asphalt ( HMA ). As the HMA cools it is compressed or rolled to remove air voids to create our roads and parking lots. Asphalt is 100% recyclable. old asphalt is pulverized and added to make new asphalt. Pulverized or recycled asphalt is considered to be a dust free and weed preventing paving product.
concrete can be reused but it does not remix or recycle with new concrete. Crushed concrete can be used as a base material or as a filler material below and alongside our roadways.