CRITERIA FOR EVALUATING THE UNIFORMITY OF MIXTURES

KRITERIEN FUER DIE BEURTEILUNG DER GLEICHMAESSIGKEIT DES MISCHGUTES

CRITERIA HAVE TO BE FOUND WHICH ALLOW THE UNIFORMITY OF A CONCRETE MIXTURE TO BE CLEARLY CHECKED. THE AIM OF THE WORK IS TO ESTABLISH HOW THE DISTRIBUTION OF THE STOCKPILE IS MADE IN THE INDIVIDUAL SAMPLES, WHEREBY THE SAMPLES HAVE TO REPRESENT PARTIAL VOLUME, A MIXING PHASE OR THE MIXING RESULT PRODUCED AT A CERTAIN TIME. THE CRITERIA AVAILABLE ARE MOISTURE CONTENT, MO. PARTICLE CONTENT AND AGGREGATES (LARGER THAN 0.25 MM). IN THIS PROCESS IT IS IMPORTANT TO ATTUNE THE SIZE OF THE SAMPLE TO THE CONTENTS OF THE MIXER. MOREOVER IT IS IMPORTANT TO CARRY OUT THE SAMPLING ACCORDING TO TYPE. POSITION AND TIME OF THE INDIVIDUAL PROCESSES DURING THE PREPARATION OF THE CONCRETE (ACTUAL MIXING AND EMPTYING). THERE IS STILL NO ANSWER TO THE QUESTION AS TO WHETHER AND HOW ONE CAN ASSESS A COMPLEX PROCESS FREQUENTLY DESCRIBED IN PRACTICE AS "INTENSITY OF THE MIXING ACTION".