![]() The uses of steel slag are diverse, as it can be used for general backfill, ground improvement, road base, foundation and slab support, etc. It is considered to be clean fill because it meets the NJDEP Non Residential Direct Contact Soil Remediation Standards, in part, because volatile, semivolatile, PCB, and pesticide compounds are eliminated by the extremely high temperatures during the smelting process. Though there are several local slag producers, the NJDEP has preapproved the slag from this facility for general construction use in New Jersey. SESI has recommended to our clients, steel slag from a local slag producer, for use as clean fill to backfill remedial excavations below the water table and elsewhere on their construction sites. 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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