GROUP ANALYSIS OF CORES OF BITUMINOUS MIXTURES

RINGVERSUCH AN BOHRKERNEN BITUMINOESER MASSEN

ACCEPTANCE TESTS ON BITUMINOUS SURFACING ARE CARRIED OUT IN AUSTRIA WITH REFERENCE TO THE RESULTS OF TESTS ON CORES. PENALTIES FOR DEFECTIVE PRODUCTS ARE ALSO WORKED OUT IN THIS WAY. THE AIM OF THE PROJECT IS TO ESTABLISH THE EXTENT TO WHICH THE TEST RESULTS FROM INDIVIDUAL CENTRES DIFFER, SO THAT SENSIBLE TOLERANCES CAN BE LAID DOWN FOR THE FUTURE. AT 23 LABORATORIES WHICH ARE AUTHORIZED TESTING CENTRES DRILLED CORES ARE TO BE OBTAINED AND MEASUREMENTS MADE OF THICKNESS, SEGREGATION AND BULK DENSITY OF THE INDIVIDUAL LAYERS (FOR FINE ASPHALTIC CONCRETE, COARSE ASPHALTIC CONCRETE, BITUMINOUS ROADBASES), AND THE BINDER CONTENT, SIEVE LINE AND DRY DENSITY OF EACH LAYER. A MARSHALL TEST IS ALSO TO BE MADE ON EACH LAYER.