Process for providing concrete surfaces with impermeable layers that are resistant to the action of chemical substances and heat

Claim 1

A PROCESS FOR PROVIDING A POROUS SOLID SURFACE WITH AN IMPERMEABLE COATING RESISTANT TO CHEMICALS AND TO HEAT, WHICH PROCESS COMPRISES APPLYING TO SAID POROUS SURFACE A PENETRATING FLUID HAVING A VISCOSITY OF ABOUT CENTIPOISES TO 50 CENTIPOISES AND CONSISTING ESSENTIALLY OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF AN UNSATURATED POLYESTER RESIN, AN ISOCYANATE MODIFIED POLYESTER RESIN, AND A REACTION PRODUCT OF A POLYISOCYANATE AND AN EPOXY RESIN,WHICH MATERIAL IS THEN HARDENED TO FORMED AN ADHESIVE LAYER (I); APPLYING THEREOVER AT LEAST ONE ADDITIONAL LAYER (II); OF A MATERIAL AS IN LAYER (I) WITH HARD ENING OF EACH YEAR, EXCEPT THE LAST, AFTER APPLICATION THE COMBINED THICKNESS OF LAYERS (I) WITH HARDBETWEEN ABOUT 0.5 TO 1 MILLIMETER; APPLYING TO THE LAST OF SAID LAYERS (II), BEFORE IT HAS HARDENED AND WHILE IT IS STILL MOIST AND STICKY, PARTICLES OF A FIRST INSERT FILLING MATERIAL HAVING SHARP EDGES, SAID PARTICLES HAVING A SIZE BETWEEN ABOUT 0.7 TO 2 MILLIMETERS, TO FORM A PARTICLE-CONTAINING LAYER (III); AND THEN APPLYING THEREOVER A FINAL LAYER (IV) BETWEEN ABOUT 1 TO 7 MILLIMETERS THICK, CONSISTING OF A RESIN SELECTED FROM THE GROUP CONSISTING OF A PHENOL FORMALDEHYDE RESIN, A FURAN RESIN AND AN EPOXY RESIN AND BETWEEN ABOUT 1 TO 60 PERCENT BASED ON THE WEIGHT OF RESIN, OF A SECOND INERT FILLER WHICH LAYER IS THEN HARDENED.