DETERMINATION OF THE INFLUENCE OF THE IMPORTANT MATERIAL FACTORS AND THE MIXTURE COMPOSITION ON THE WEAR OF BITUMINOUS SURFACINGS

ERMITTLUNG DES EINFLUSSES DER WICHTIGEN MATERIALTECHNISCHEN FAKTOREN UND DER MISCHGUTZUSAMMENSETZUNG AUF DEN VER SCHLEISS BITUMINOESER FAHRBAHNDECKEN

VIEWS ON FACTORS WHICH EFFECT A DECREASE IN WEAR STILL VARY A GREAT DEAL, BECAUSE THERE HAVE BEEN NO SYSTEMATIC STUDIES OF FACTORS WHICH INFLUENCE WEAR.THE RESULTS FROM INDIVIDUAL EXPERIMENTAL ROADS CANNOT BE USED TO MAKE GENERALIZATIONS. IT IS THEREFORE NECESSARY TO SEARCH FOR GENERALLY VALID RULES. BY MEANS OF SAMPLES OF ASPHALTIC CONCRETE AND GUSSASPHALT,ONE HUNDRED DIFFERENT TYPES OF MIXTURE ARE TO BE TESTED WITH SIX DIFFERENT INSTRUMENTS IN A PRESCRIBED FASHION TO DETERMINE THEIR WEAR BEHAVIOUR. IN PARTICULAR, THE PARTICLE-SIZE, THE CONTENT OF CHIPPINGS, QUALITY OF THE CRUSHED SAND, TYPE OF FILLER, TYPE OF BINDER AND HARDNESS OF BINDER ARE TO BE VARIED. THE INFLUENCES WHICH RESULT FROM THE MIX COMPOSITION ARE IN EACH CASE TESTED ON THREE TYPES OF CHIPPINGS, SO THAT IT CAN BE DETERMINED WHETHER THE COMPOSITION HAS A SIMILAR EFFECT WITH DIFFERENT TYPES OF CHIPPINGS.APART FROM THIS,THE INFLUENCE OF SOME CURRENTLY USED OR RECOMMENDED ADMIXTURES, SUCH AS NATURAL ROCK ASPHALT, MINERAL FIBRES, PLASTICS, ELASTOMERS ETC. IS TO BE STUDIED.