TESTING OF THE BEHAVIOUR OF SYNTHETIC RESIN ADHESIVE LAYERS ON ORTHOTROPIC STEEL PLATES UNDER THERMAL STRESS

PRUEFUNG DES VERHALTENS VON KUNSTHARZ-HAFTSCHICHTEN AUF ORTHOTROPEN STAHLPLATTEN BEI THERMISCHER BEANSPRUCHUNG

AS WELL AS BITUMINOUS LAYERS ON ORTHOTROPIC STEEL PLATES, INCREASING USE HAS BEEN MADE RECENTLY OF PLASTIC ADHESIVE LAYERS WHICH HAVE PROVED THEMSELVES IN CONTINUOUS SWELLING AND BENDING TESTS. THERMAL STRESSES, SUCH AS OCCUR DURING THE LAYING OF GUSSASPHALT, CAN CAUSE SIGNIFICANT ALTERATIONS IN THE SYNTHETIC RESIN ADHESIVE LAYERS. IN FUTURE THE ONLY SYNTHETIC RESIN LAYERS TO BE USED ARE THOSE WHICH HAVE STOOD CONTINUOUS SWELLING AND BENDING TESTS AND ARE ALSO RESISTANT TO THERMAL STRESS. A TESTING INSTALLATION IS TO BE CREATED WHICH ENABLES STEEL PLATES COVERED IN SYNTHETIC RESIN TO BE STRESSED BY A HOT LIQUID, WHICH IS AS TRANSPARENT AS POSSIBLE AND DOES NOT REACT CHEMICALLY, IN SUCH A WAY THAT THE COURSE OF TEMPERATURE ON THE CONSTRUCTION SITE IS SIMULATED. THE TESTS ARE TO BE CARRIED OUT IN SUCH A WAY THAT THE LAYERS, BOTH WITH AND WITHOUT CHIPPINGS SPREAD ON THEM, ARE SUBJECTED TO VARIOUS HARDENING CONDITIONS BEFORE BEING STRESSED THERMALLY. THE TIME, THE TEMPERATURE AND THE AIR MOISTURE ARE BEING VARIED. AFTER THE THERMAL STRESSING THE LAYERS ARE EVALUATED FOR DEGREE OF BLISTERING, DICOLORATION, DENSITY OF VOIDS, AND HARDNESS.