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Polymer dispersions are widely used in cementitious materials, known as polymer-modified mortar (PCM) or concrete-polymer composite (CPC).The composite is thus composed of two binders, polymer and cement.In the ideal case, both binders complement each other to result in a material with improved performance.Typically one aims at improving the adhesion to substrates, the permeability of the material, as well as its flexibility.It is of utmost importance to understand how both binders interact in order to project what macroscopic properties the composite will exhibit.It has been known that the latex particles adsorb on surface of cement grains driven by electrostatic interaction.A first step towards understanding the interaction of both binders is following the adsorption of the polymer latexes on the surface of cement particles.Based on the results gathered we were able to establish a connection between the coverage of cement particles with latexes and the hydration kinetics of the cement.