Schnabel Engineering's “Innovative Dredged Material Reuse” project was selected as an Outstanding Project in the American Council of Engineering Companies/Maryland Engineering Excellence Awards (EEA) competition. The objective of the EEA award is “to recognize engineering and surveying firms for projects which demonstrate the highest degree of achievement, value and ingenuity.”
completed its innovative dredge material reuse project for the Maryland Port
Administration, under its new “Innovative Reuse of Dredged Material” program.
Schnabel’s study provides a unique way to beneficially use 500,000 cubic yards
of Cox Creek dredged material (DM) per year.
that blending of Cox Creek DM and steel slag fines (SSF), another waste
material, could produce earth-fill materials to be used for construction of
highways, parking lots and other construction fill needs. The soft consistency
and organic matter content of DM makes it unusable as fill material without
blending it with other earth fill, cement or crushed stone, which is costly and
uneconomical. Schnabel searched the Baltimore
area for a material with little or no cost that would improve the DM for use as
fill material. The search led to SSF from the Sparrows Point Steel Mill
complex, which is located across the harbor from Cox Creek. Through this study,
it was demonstrated that mixing the DM with SSF provided immobilization of the
metal contaminants in the DM. When the DM was mixed with the SSF, the metals
were immobilized by the residual lime content of the SSF. Additionally, the
study demonstrated that construction fill material could be consistently
produced mixing DM with as little as 20 percent SSF.