Chemistry of the calcite/water interface: Influence of sulfate ions and consequences in terms of cohesion forces

摘要: Abstract Calcite suspensions are used to mimic the behavior of more complex cementitious systems. Therefore characterization calcite–water interface in strong alkaline conditions, through ionic adsorption, electrokinetic measurements, static rheology and atomic force microscopy is a prerequisite. Calcium, potential determining ion for calcite, adsorbs specifically onto weakly positively charged calcite surface water. This leads an increase repulsive electric double layer thus weakens particle cohesion. Sulfate made at constant calcium concentration strength, significantly increases attractive interactions between particles despite its very low adsorption. attributed lowering electrostatic repulsion connection with evolution zeta potential. The linear relationship found yield stress ζ2 proves that classical DLVO theory applies these systems, contrary what was previously observed C–S–H under same conditions.