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THE COMPACTION OF AGGREGATES IN MARSHALL SAMPLES WITH RESPECT TO PARTICLE COMPOSITION, THE WIDTH OF THE GRADATION AREA AND THE SAMPLE SIZE

UNTERSUCHUNGEN UEBER DIE LAGERUNGSDICHTE DER MINERALSTOFFE IN MARSHALLPROBEKOERPERN IN ABHAENGIGKEIT VON DER KORNZUSAMMENSETZUNG, DER WEITE DES KOERNUNGSBEREICHES UND DER PROBEKOERPERGROESSE

FOR MANY YEARS THE CHARACTERISTIC VALUES OF THE MARSHALL SAMPLE HAVE REPRESENTED THE CRITERIA FOR EVALUATING THE SUITABILITY AND QUALITY OF BITUMINOUS MIXTURES. THE BULK DENSITY OF THE MARSHALL SAMPLE GIVES THE REFERENCE VALUE FOR EVALUATING THE LAYING OF ROLLED ASPHALT COURSES (DEGREE OF COMPACTION). THE PROBLEM LIES IN THE PRODUCTION OF THE MARSHALL SAMPLE FOR COARSE-GRAINED BITUMINOUS MIXTURES, AND IN PARTICULAR THOSE CONTAINING COARSE CHIPPINGS (GAP GRADING). THE OBJECT OF THE STUDY IS TO FIND REASONS FOR THE DECREASE IN THE COMPACTION OF THE SAMPLE IN THE CASE OF COARSE-GRAINED OR GAP-GRADED MIXTURES, AND THE EFFECT OF THE VOIDS FILLING H (INDEX A), WHICH DECREASES WITH PARTICLE SIZE, ON THE COMPACTION PROPERTIES OF THE BITUMINOUS MIXTURES.