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PLANNING, EXECUTION AND EVALUATION OF GROUP ANALYSES TO DEFINE THE REPEATABILITY OF THE PROCEDURE FOR CARRYING OUT IMPACT TESTS ON CHIPPINGS

PLANUNG, DURCHFUEHRUNG UND AUSWERTUNG VON RINGANALYSEN ZUR BESTIMMUNG DER REPRODUZIERBARKEIT DES PRUEFVERFAHRENS SCHLAGVERSUCHE AN SPLITT

STANDARDS FOR THE TESTING OF AGGREGATES DO NOT CONTAIN DATA ON TESTING ERRORS. STANDARD DEVIATIONS IN THE MOST IMPORTANT TEST PROCEDURES HAVE TO BE DETERMINED BY GROUP ANALYSES. STANDARD IMPACT TESTING EQUIPMENT CURRENTLY ON THE MARKET HAS BEEN DEVELOPED BY THE MATERIALS TESTING INSTITUTE AND CHECKED WITH ELECTRONIC EQUIPMENT; THUS THE DEVIATION RELATED TO THE EQUIPMENT IS KNOWN. STANDARD DEVIATIONS NOT KNOWN ARE THOSE UNDER TEST CONDITIONS - MULTIPLE TESTING UNDER REPETITIVE AND COMPARATIVE CONDITIONS. A GROUP ANALYSIS IS TO BE CARRIED OUT WITH 4 TYPES OF ROCK IN 11 TEST CENTRES AND RELATED TO RESULTS FROM ELECTRONIC MEASUREMENTS, IN ORDER TO REDUCE SCATTER UNDER COMPARATIVE CONDITIONS. THE MATERIAL IS BEING TESTED AND EVALUATED CENTRALLY. LIMESTONE, BASALT, GRANITE AND ROUNDED GRAVEL ARE BEING TESTED, WHICH RESULTS IN A VARIATION OF THE ABSOLUTE MAGNITUDE OF THE IMPACT DESTRUCTION VALUE. FOR ONE OF THE ROCKS THE PARTICLE SHAPE IS BEING VARIED BY POES SIEVING IN SUCH A WAY THAT DEPENDENCE OF THE TEST-RELATED SCATTER ON THE PARTICLE SHAPE DURING IMPACT TESTING CAN BE ESTABLISHED.