QUALITY ANALYSIS QUALITY-CONTROL TESTS FOR FIELD STABILIZATION SOLIDIFICATION .2. UNTREATED WASTE, SODIUM-SILICATE SOLUTION AND SOLIDIFIED WASTE/

This paper reports on the efficacy of selected quality analysis/qualit y control testing procedures that were used during a full-scale stabil ization/solidification trial of an arc furnace dust with high multiple contaminants. The quality analysis/quality control test results of un treated waste, sodium silicate solution and solidified waste are discu ssed. Moisture content of the untreated waste was measured to control water addition. It was found that sodium silicate concentration in sol ution was linearly related to its specific gravity. Thus, hydrometer m easurement of specific gravity was used to control the silicate concen tration in solution. Bulk density, moisture content, and cone and K-sl ump of freshly solidified wastes were measured. Laboratory measurement of bulk density and moisture content of freshly solidified wastes cor related well with water addition. It appeared from the field data that bulk density measurement underestimated the actual water-to-solid rat ios, while moisture content measurement overestimated them. Cone slump and K-slump measurements fluctuated widely, the measurements were wit hin the range normally observed from different types of concrete. (C) 1996 Elsevier Science Ltd