Modification of the Physicochemical Properties of Cement Paste by Incorporation of Aluminosilicate Clays: Effect on Strength, Durability, and Toughness

摘要

This report describes the theoretical basis, experimental approaches, and results to date of research carried out to determine whether addition of natural aluminosilicate clays to Portland cement can improve mechanical properties of hardened pastes. The concept that such additions hold promise for stringer and tougher cement-based composites stems from the physicochemical properties of these clays including, for example, high specific surface compared to silica fume, ion-exchange behavior, needle-like crystal morphology in certain cases, and particle sizes in the colloidal range. These characteristics tend to allow reduction of pore sizes in porous media, increase in Van der Waals bonding of solid phases in composites, and manipulation of chemical composition of pore solutions. Cement, CLAY, Soils, Composite materials, Alumino silicate. (jes)