black aggregate. The fusion of combined incinerator ash and sewage sludge is currently practiced in Japan.

The first U.S. building to be built from recycled incinerator ash blocks is an 8,000-square-foot boathouse on the campus of the State University of New York at Stony Brook, Long Island. The ash comes from an incinerator in Peekskill and is mixed with sand and cement to form blocks that are as durable as standard cinder blocks. This technology has already been used in Europe. The blocks can be used to build seawalls, highway dividers, and sound barriers, in addition to regular buildings. It is the bottom ash (not the fly ash) portion that is considered safe for such applications.

The ash produced by one New York City incinerator has been extensively sampled and evaluated. Fly ash contains substantial quantities of organic materials. About 20% by weight is larger than 2" (50.8 mm); the metal content of this fraction is over 80% by weight. The overall composition of all the incinerator residue (Table 10.6.1)

differed substantially from the composition of the under-2" (50.8 mm) fraction (Table 10.6.2). The test also concluded that the New York State Department of Transportation specifications for Type 3 asphalt binder can be met if 10% combined incinerator ash is mixed in with 90% natural aggregate.

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