A CALORIMETRIC STUDY OF THE EFFECT OF ORGANIC-COMPOUNDS ON THE INITIAL BEHAVIOR OF CEMENT-BASED SOLIDIFIED WASTES

Seven organic compounds commonly found in toxic wastes were added to o rdinary Portland cement (OPC) at varying concentrations. The influence of these organics, which display a variety of chemical characteristic s, on the heat of hydration, setting, strength development and microst ructure were observed. Most organics influenced early hydration by ret ardation 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 distri bution of hydration phases and topographic features existed despite th e absence of significant interference with normal hydration reactions.