A Calorimetric Study of the Effect of Organic Compounds On the Initial Behaviour of Cement-Based Solidified Wastes

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Abstract
Seven organic compounds commonly found in toxic wastes were added to ordinary Portland cement (OPC) at varying concentrations. The influence of these organics, which display a variety of chemical characteristics, on the heat of hydration, setting, strength development and microstructure were observed. Most organics influenced early hydration by retardation or acceleration but mature samples displayed a similar phase composition to the OPC control. Microstructural observation of organic-containing OPC indicated that subtle spatial variations in the distribution of hydration phases and topographic features existed despite the absence of significant interference with normal hydration reactions.