Recycling Spent Sandblasting Grit and Similar Wastes as Aggregate in Asphaltic Concrete
Technical data sheet
NAVAL FACILITIES ENGINEERING SERVICE CENTER PORT HUENEME CA
Pagination or Media Count:
The Naval Facilities Engineering Service Center NFESC, Port Hueneme, California, and Naval Facilities Engineering Command Engineering Field Activity, West, San Bruno, California, took overall leadership in identifying and testing methods to manage waste generated from a machine shop located at Hunters Point Annex, at Naval Station, Treasure Island, California. The machine shop specialized in commercial ship repair operations including corrosion control work. Ship cleaning and equipment maintenance resulted in the accumulation of 4,665 tons of spent sandblasting grit at the site. The spent grit, consisting of silica sand plus a small amount of slag-derived grit, had the physical characteristics of coarse-grained beach sand and also contained fragments of coatings. The spent grit had the potential for exhibiting hazardous characteristics since the coatings included lead-based primers, copper, and butyltin-containing antifouling topcoats. The most beneficial application of reusing the spent grit was to use it as a replacement for some of the fine aggregate in asphaltic concrete. A test program was established that included characterization, bench-scale testing, long-term pilot scale testing, and a full-scale demonstration. Full-scale asphalt production provided samples which proved both the chemical leaching resistance and physical performance characteristics were acceptable. Using spent grit as aggregate is an effective and economically viable option to recycling waste material U.S. EPA, 1994, and provides waste minimization benefits by avoiding use of landfill space and reducing consumption of resources.
- Solid Wastes and Pollution and Control