The high cost of sampling and laboratory analyses, which can be a strain on a project's proforma, in many cases can be avoided by the use of steel slag. The NJDEP requires that all clean fill sources be screened and tested in accordance with the Alternative and Clean Fill Guidance Document, dated December 29, 2011. Steel slag, in addition to being a lowcost alternative to its quarriedstone counterparts, is readily available at several facilities in New Jersey and Pennsylvania. Several of SESI's clients have used it as a means to significantly reduce construction material costs during site preparation. The geotechnical properties of steel slag, the low cost of production, and the fact that it is a byproduct of recycling, make it an economical and sustainable alternative to crushed stone and granular backfill. Large pieces of slag are processed for disposal or can be separated into various gradations for construction uses. The molten slag is slowly cooled by a water mist until solidified. Steel Slag is a byproduct of the iron and steel recycling process, produced by removing the molten impurities from the surface of electric arc furnace smelting pots.
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