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    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>LABORATORY EVALUATION OF ENGINEERED ABRASIVES AND SURFACE TREATMENTS FOR MIXED-METAL BLAST MEDIA WASTES</title>
      <link>https://trid.trb.org/View/658727</link>
      <description><![CDATA[The heavy duty maintenance painting industry commonly uses engineered abrasives and topical stabilizers to prevent spent blast media and paint debris from exhibiting the hazardous characteristic for lead.  Engineered abrasives are mixtures of virgin blast media and stabilizing additives.  This combination, when used to remove coatings containing lead, renders the waste nonhazardous.  Topical stabilizers are spray-applied coatings that contain a stabilizer.  During the removal process, the stabilizer-containing coating mixes with the hazardous paint and spent blast media to render the blasting debris non-hazardous. This article describes testing conducted on waste stabilization. Phase I testing was performed to verify the efficacy of commercially available blast media additives and topical stabilizers with respect to lead and to determine their limitations with respect to chromium and cadmium stabilization. In Phase II, new blast media additives for stabilizing mixed wastes containing lead, chromium, and cadmium were developed, and their performance was evaluated in the laboratory.  Only one of four commercially available products tested (BA-2) was capable of eliminating the hazardous characteristics of cadmium in the synthesized paint blast media wastes.  None of the commercially available products tested eliminated the hazardous characteristic of chromium from basic zinc potassium chromate.  BA-2 had a measurable effect on the leachability of chromium.  Four modified versions of BA-2 were evaluated.  BA-2C 20% addition and BA-2D 15% addition successfully eliminated the hazardous characteristic for lead, cadmium, and chromium.  The efficacy of these products is not based on the addition of elemental iron.  These products are effective wide-spectrum blast media additive stabilizers for the synthesized hazardous paint blast media wastes.  Further research is needed to evaluate potential negative effects on the performance of coatings applied over surfaces prepared using the BA-2C and BA-2D blast additives.]]></description>
      <pubDate>Wed, 30 Aug 2000 00:00:00 GMT</pubDate>
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      <title>THE USE OF CORROSION INHIBITORS FOR THE PROTECTION OF CONCRETE REINFORCEMENT / IN ITALIAN/</title>
      <link>https://trid.trb.org/View/108184</link>
      <description><![CDATA[A STUDY IS DESCRIBED ON THE ELECTRO-CHEMICAL EFFECTS OF 2 STEEL CORROSION INHIBITORS: POTASSIUM CHROMATE AND SODIUM NITRITE. TESTS WERE CARRIED OUT ON MORTAR PREPARED WITH THREE-TYPES OF CEMENT: PORTLAND CEMENT, BLAST-FURNACE CEMENT, AND POZZOLANIC CEMENT, SOME WITH AND SOME WITHOUT CALCIUM CHLORIDE. DURING MOULDING, A STEEL BAR WAS INSERTED IN EACH CYLINDICAL SAMPLE. AFTER 48 HOURS THE SAMPLES WERE IMMERSED IN A CALCIUM HYDROXIDE SOLUTION IN WHICH GRAPHITE ELECTRODES WERE ALSO PLACED. A CURRENT OF INCREASING CONCRENTRATION WAS APPLIED TO THE STEEL BAR AND GRAPHITE CATHODES, AND ANODIC POLARIZATION CURVES WERE DRAWN. THOSE CURVES SHOW THAT FOR PORTLAND AND POZZOLANIC CEMENT THE TWO INHIBITORS COMPLETELY NEUTRALIZE THE DEPASSIVATING EFFECT OF CALCIUM CHLORIDE. WITH REGARD TO BLAST FURNACE CEMENT, THE NEUTRALIZATION IS LESS COMPLETE FOR 2 PER CENT OF CALCIUM CHLORIDE BUT BECOMES COMPLETE WHEN THE PROPORTION BECOMES 1 PER CENT OF CALCIUM CHLORIDE. THIS SUGGESTS THAT THERE EXISTS A COMPETITIVE EFFECT BETWEEN THE INFLUENCE OF THE INHIBITOR AND THAT OF THE ADMIXTURE /LCPC/RRL/]]></description>
      <pubDate>Tue, 13 Oct 1970 00:00:00 GMT</pubDate>
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