Polymer-cement composites with improved adhesion to the concrete substrate
Warsaw University of Technology, Faculty of Civil Engineering, al. Armii Ludowej 16, Warszawa 00-637, Poland
The paper deals with polymer-cement concretes (PCC) of improved adhesion to the concrete substrate. The classification and main uses of PCC materials in repairing and anti-corrosion protection of the concrete structures as well as in industrial floors, overlays and pre-cast elements have been briefly described. The types of polymer modifiers have been categorised. The influence of polymers on the material microstructure and mechanisms of possible improving of the material properties – particularly bond strength, tensile and flexural strength and tightness – have been discussed. The results of investigations, performed under the framework of the project granted by Polish State Committee for Scientific Research (No. 4 T07E 007 26), have been presented. At the initial stage of research several types of polymer modifiers have been tested; the polyacrylate dispersion (PAE) has been chosen for the further investigation as the most promising one. During the next stage the experiment has been carried out using statistical design of experiment. The material models (a composition – properties relationship formulated in the quantitative way) of polymer-cement mortar have been developed regarding to adhesion to the concrete substrate, tensile strength and water absorbability, with polymer and cement contents as the material (input) variables. High values of determination coefficient R2 (more than 0.75) have proved the good quality of the models. The statistical analysis of the models made possible to evaluate the synergic effects and the significance of the particular components of polymer-cement binder for creation of the bond strength and other technical properties of the material. This led to the finding that the polymer modifier and its co-operation with inorganic binder is more important than the Portland cement itself for some of those features. General conclusions about future needs in this field of research have also been formulated.
Presentation: oral at E-MRS Fall Meeting 2005, Symposium G, by Paweł Łukowski
See On-line Journal of E-MRS Fall Meeting 2005
Submitted: 2005-05-06 07:21 Revised: 2009-06-07 00:44