DEVELOPMENT OF A METHOD OF DETERMINING THE MECHANICAL STABILITY OF BITUMINOUS SEALING MATERIALS

ENTWICKLUNG EINES UNTERSUCHUNGSVERFAHRENS ZUR BESTIMMUNG DER MECHANISCHEN STABILITAET BITUMINOESER ABDICHTUNGSWERKSTOFFE

ONE OF THE DETERMINING PROPERTIES OF BITUMINOUS SEALING MATERIALS USED FOR INSULATING BRIDGE DECKS IS RESISTANCE TO MECHANICAL STRESS WHICH OCCURS DURING USE. AT PRESENT THERE IS NO METHOD WHICH ALLOWS THE MECHANICAL RESISTANCE TO SHEARING AND FORCE UNDER TEMPERATURES IN PRACTICE TO BE DETERMINED QUANTITATIVELY. A TEST PROCEDURE HAS BEEN DEVELOPED WHICH IS SUITABLE FOR THE STUDY OF SEALING MATS AND ADHESIVES IN TEMPERATURES RANGING FROM - 25 DEGREES C TO + 50 DEGREES C. THE SPECIFICATION DESCRIBING THE PROCEDURE, THE INCORPORATION OF THE TEST PIECE AND THE ESTABLISHMENT OF THE FINAL DIMENSIONS OF THE TEST INSTALLATION IS TO BE EXAMINED. A COMPARISON IS TO BE MADE WITH MANUFACTURED SEALING MATS, AND AN EXPLANATION IS TO BE GIVEN OF THE INFLUENCE OF THE RELATION OF FORCE TO SHEAR, THE INFLUENCE OF THE LAYER THICKNESS, THE INFLUENCE OF THE SHEARING SURFACE AND THE SHEARING RATE AND THE INFLUENCE OF THE FILLER CONTENT ON THE SHEAR STRENGTH. THE AIM OF THE STUDIES IS TO DERIVE QUALITY SPECIFICATIONS FOR SEALING MATERIALS FOR BRIDGES.