| 摘要 |
An asphaltic concrete or paving material (10) is produced that contains from about 5 percent or more, and up to about 20 percent, activated granular recycled plastic (22), which supplements or replaces rock aggregate (21) in the mixture. The source plastic (31) may include mixed residual classes of recyclable plastic, including thermosetting plastics and other plastics having little to no widespread utility. The paving material (10) produces roadbeds (12) of higher strength and durability, requiring less total asphalt thickness and providing greater water impermeability. The recycled plastic component (31) of the material is a mixture of any and all recyclable classes 3 through 7, or of those materials from such classes remaining after potentially more valuable recyclable materials may have been selectively removed. The paving product (10) is preferably formed by a process of shredding or mechanically granulating used and industrial waste plastic to a no.4 to 1/2 inch sieve size, and to 1/4 inch to 3/8 inch granules. The Plastic may be cooled during the granulating process. The granules are then treated with an energized activating medium, a plasma formed in preferably argon or some other plasma enhancing gas (93), to activate the surface of the granules, without burning or melting the plastic- Humidity free gas, from a dehumidifier (79) or other source, fills voids in the particle mass fed to an input hopper (82) or otherwise to the top of a vertical plasma column (81) having the argon flowing upwardly therethrough. A replaceable plastic liner (98) protects the column walls from deposits. Gas bursts prevent clogging of the particles in the column. The activated treated granules are added to the aggregate then mixed with the asphalt binder to produce the paving meterial. A slurry or sands mix of plastic and binder may also be applied over an aggregate layer, base layer or roadbed.
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