Calcium Hydroxide Formation in Cement-Solidified Industrial Wastes

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Abstract
Differential thermal analysis (DTA) and X-ray diffraction (XRD) were used to compare the formation of calcium hydroxide (Ca(OH)2) in cement solidified wastes hydrated for different times. Both techniques confirm a decrease in the relative amount of Ca(OH)2 and an increase in unreacted cement clinker phases in samples containing three different commercially produced industrial wastes. All three wastes induce significant changes to normal cement hydration reactions which increase with increasing waste addition. When metal leaching has been assessed using the TCLP test, the concentration of metals present in leachates are not significantly affected by the amount of waste present in the solidified product. This demonstrates that acceptable results from single extraction batch leach tests such as the TCLP test may not adequately indicate the quality of solidified wastes.

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