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https://www.nationalacademies.org/trb/events

DETERMINATION OF THE DISPERSION RANGE IN THE DETERMINATION OF THE DEGREE OF COMPACTION IN BITUMINOUS COURSES

ERMITTLUNG DER STREUBEREICHE BEI DER BESTIMMUNG DES VERDICHTUNGSGRADES BITUMINOESER SCHICHTEN

BECAUSE OF THE IMPORTANCE OF COMPACTION, THE SPECIFICATIONS PROVIDE FOR A REDUCTION IN THE REMUNERATION IF THE SPECIFIED VALUE IS NOT ACHIEVED. SINCE THE DEGREE OF COMPACTION IS CALCULATED FROM THE BULK DENSITIES OF DRILL CORES AND SPECIMENS FROM THE MIX, THE ACCURACY OF THE RESULTS IS INFLUENCED BY A NUMBER OF PROCESSES. THE AIM OF THE WORK IS THEREFORE, BY MEANS OF A STUDY IN WHICH 30 TEST CENTRES ARE PARTICIPATING, TO DETERMINE THE RELATIVE DISPERSION RANGES WHICH OCCUR IN THE DETERMINATION OF THE DEGREE OF COMPACTION. THE DEGREE OF COMPACTION IS DETERMINED IN AN ASPHALTIC CONCRETE COURSE AND IN A BASE- COURSE OF BITUMEN AND SANDY GRAVEL. IN ADDITION TO THE DETERMINATION OF THE RELATIVE RANGE OF DISPERSION FOR THE DEGREE OF COMPACTION, THE RESULTS OF THE ADDITIONAL TESTS WILL BE EVALUATED STATISTICALLY. THIS SHOULD CLEAR UP THE QUESTION AS TO WHETHER, FOR THE DETERMINATION OF THE DEGREE OF COMPACTION, MARSHALL SPECIMENS FROM THE CORRESPONDING MIX AS LAID DOWN IN THE RELEVANT SPECIFICATIONS ARE NECESSARY OR WHETHER IT IS POSSIBLE TO TAKE TEST SPECIMENS MADE FROM THE REMELTED MATERIAL OF THE DRILL CORES.