QUALITY ANALYSIS QUALITY-CONTROL, TESTS FOR FIELD STABILIZATION SOLIDIFICATION .1. DRY CEMENTING ADDITIVES

As part of a field validation study of their proposed protocol for sol idified waste evaluation, which will correlate laboratory test results with field behaviour, the Wastewater Technology Centre investigated t he applicability of several rapid tests for quality analysis and contr ol of the field solidified waste. A pilot-scale landfill was construct ed and 63 m(3) solidified are furnace dust placed in it using a cement ing system consisting of blast furnace slag, lime, silica fume and sod ium metasilicate. The ground blast furnace slag, hydrated high calcium lime and silica fume were pre-blended before being trucked to the hel d site and the sodium metasilicate was added in the mixing water. Avai lable lime index using the rapid sugar method (ASTM C-25) and measurem ent of specific gravity were used to determine the effect of mixing pr ocedures and transportation on the homogeneity of the blended dry addi tives. Experimental results indicate that the rapid sugar method can g ive an accurate analysis of lime content in the pre-blended additives. There is a good linear relationship between the slag content and spec ific gravity because the lime and silica fume have a similar specific gravity. However, the agglomeration of the blended additives affects t he accuracy and precision of the method.