Experimental and Theoretical Evidence of the Overcharging in Calcium-Silicate-Hydrate

2006

International audience

Intrinsic Elastic Properties of Calcium Silicate Hydrates by Nanoindentation

2007

International audience; To understand the mechanical properties of cement materials is obviously one of the main purposes of the material science. But the mechanical properties measures of a cement piece by conventional methods (vibration, compression, etc.) are largely dependent on the sample porosity. Hence, the result gives information about the sample density rather than on the intrinsic mechanical properties of the material itself. This work aims to present results on cement materials (alite and C-S-H) mechanical properties obtained by nanoindentation using an atomic force microscope (AFM). The material Young modulus in the z-direction is obtained by applying a force perpendicular to t…

Adsorption of multivalent ions in cementitious materials : Importance of electrostatics

2008

Colloidal Behavior of C-S-H Nanohydrates in Cement Paste

2010

International audience; Among the hydrates constituting a cement paste, C-S-H is the main component, it represents at least 60 % of the fully hydrated paste. C-S-H has a lamellar structure similar to that of a rare mineral, tobermorite. The germination and growth of the C-S-H particles result in increasing mechanical resistance (strength, cohesion). Mechanical experiments show that the intrinsic properties of the paste remain the same throughout the hydration process. Indeed, despite its very high compression strength properties the hydrated cement paste retains the same very low critical strain (~10 -4) characterizing a small elastic limit of the material. More recently, AFM experiments ha…