| 摘要 |
Processes for the production of a hardenable mass having low permeability characteristics are disclosed, as well as the compositions produced thereby. The process includes providing a slurry produced from the scrubbing of sulfur oxide-containing gases with alkaline earth metal compounds, the slurry comprising an aqueous suspension of alkaline earth metal sulfites, mixing the slurry with a pozzolanically active waste material such as fly ash and an alkaline earth metal in the form of an alkaline earth metal hydroxide or a hydratable alkaline earth metal oxide in amounts so as to provide an overall composition including greater than about 3.5 weight percent alkaline earth metal oxide or hydroxide, that amount being based on an equivalent amount of alkaline earth metal oxide, on a dry weight and additive basis, and continuing the mixing of the overall composition for a period of time sufficient to provide a degree of mixing at least equivalent to about thirty seconds in a Hobart planetary mixer, at first speed, whereby the overall composition is mixed to a degree at least approaching the thixotropic state therefore. The compositions produced by this process have improved compressive strengths and significantly reduced permeability coefficients of less than about 1.0x10 -7 cm/sec.
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