L. Raki, J. Beaudoin, and g. Chan
Institute for Research in Construction, National Research Council Canada
Development of new materials for programmed delivery and control of admixtures effects in concrete and other materials represents a significant technological advance. A series of new organo-mineral phases have been developed using the “chimie douce” technique and characterized using a number of analytical techniques: X-ray diffraction (XRD), thermogravimetric analysis (TGA), infrared spectroscopy (IR), scanning electron microscopy (SEM), and nuclear magnetic resonance (NMR). Conduction calorimetry (CC) was used to study the effect of these additives on the hydration kinetics of cement phases. The slump loss characteristics of cement paste and mortar samples containing different amounts of these composite additives were investigated. The results showed that the addition of these new formulations to cement not only maintained the workability of the fresh mix but also improved the strength development of mortar samples.