Cj. Shi et al., QUALITY ANALYSIS QUALITY-CONTROL TESTS FOR FIELD STABILIZATION SOLIDIFICATION .2. UNTREATED WASTE, SODIUM-SILICATE SOLUTION AND SOLIDIFIED WASTE/, Waste management, 15(7), 1995, pp. 507-513
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