Identification of Acceptable/Beneficial Refuses for Spent Bridge Painting Blast Material

摘要

The report documents the results of an investigation to identify potential beneficial reuses for spent bridge painting blast material. Nine samples of the spent material generated at various PennDOT maintenance projects were characterized both physically and chemically. Two coal slag abrasive samples and one copper slag abrasive sample which reported hazardous levels of lead on the EP and TCLP extraction tests were evaluated in possible reuse applications. Of the eight potential reuse applications, only structural clay products offered the potential to fully reuse the spent abrasive material without significant material upgrading, while yielding products that demonstrated equivalent or improved performance over those made with standard feed materials. Bricks made with up to 40% spent abrasive material demonstrated improved mechanical performance and equivalent or improved shrinkage and density over the standard.