THE LOOSENING OF SYNTHETIC RESIN COATINGS ON CONCRETE SURFACINGS

UNTERSUCHUNGEN UEBER DAS ABLOESEN VON KUNSTHARZBESCHICHTUNGEN AUF BETONDECKEN

WHEN CONCRETE IS PROVIDED WITH SURFACE COATINGS, THE SYNTHETIC RESIN LAYER ADDED ALWAYS COMES LOOSE FROM THE CONCRETE WITH THE TOP FINE MORTAR. IT IS NOT CLEAR TO WHAT EXTENT THIS CAN BE TRACED BACK TO FROST DAMAGE IN THE TOP LAYER OF THE CONCRETE WHICH HAS BECOME SATURATED WITH WATER THROUGH STEAM DIFFUSION, OR STRESSES IN THE TOP LAYER OF THE CONCRETE CAUSED BY SHRINKAGE AND TEMPERATURE-DEFORMATION OF THE SYNTHETIC RESIN COATINGS, OR TO OTHER EFFECTS (TRAFFIC, CHANGE OF TEMPERATURE DURING SALT SPREADING ETC.). THE AIM IS TO WORK OUT METHODS OF AVOIDING THIS LOOSENING OF SYNTHETIC RESIN COATINGS. THESE WILL PROBABLY TAKE THE FORM OF 1 - REQUIREMENTS OF THE CONCRETE SURFACE (ADHESION STRENGTH AND CONDITION); 2 - REQUIREMENTS OF THE SYNTHETIC RESIN MORTAR (MODULUS OF ELASTICITY, STRENGTH, HEAT EXTENSION COEFFICIENT, SHRINKAGE, STEAM PERMEABILITY, WATER ABSORPTION); 3 - ADDITIONAL REQUIREMENTS (FOR EXAMPLE DEPENDENT ON TEMPERATURE DURING INCORPORATION).