Microstructure building in mortars modified with water-soluble polymers
|Dionys Van Gemert 1, Elke Knapen|
1. K. U. Leuven, Civil Engineering Department (K.U.Leuven), Kasteelpark Arenberg 40, Leuven 3001, Belgium
Usually, polymer-modified cement concrete or mortar is prepared by mixing polymer dispersions or redispersible polymer powders with the fresh mixture. The surface active agents, added to allow emulsification and stabilization of the dispersion during storage, hinder the cement hydration and the polymer film formation. Therefore, the addition of polymers in aqueous solution is aimed for. Water-soluble polymer molecules are supplied on a molecular scale, improving the approach of the relatively large cement grains by the polymers. This will allow the building up of composite polymer-cement microstructures on a nano-scale. In the absence of surface active agents, water-soluble polymers tend to require a lower proportion in order to be comparably effective as polymer dispersions. The addition of very small amounts of water-soluble polymers results in an improvement of the durability and the adhesion strength of the cementitious materials, which makes them appropriate as repair materials.
Presentation: invited oral at E-MRS Fall Meeting 2005, Symposium G, by Dionys Van Gemert
See On-line Journal of E-MRS Fall Meeting 2005
Submitted: 2005-05-30 15:29 Revised: 2009-06-07 00:44