| abstract |
The invention relates to an anti-shrink agent for a cementitious composition, such as cement paste, mortar or concrete, characterized in that it is in the form of surface-modified particles constituted of mineral nanoparticles covered with a polymer coating formed predominantly of polyalkyl oxides. It makes it possible to reduce the shrinkage by more than 65%, without retardation of setting, and also gives the mortar or concrete composition superplasticizing properties. |