QUALITY CONTROL OF CRUSHED AGGREGATES TO INSURE A QUALITY PRODUCT

BROADLY SPEAKING, THE PRODUCTION AREAS FOR PROCESS CONTROL ARE QUARRY OPERATIONS, PROCESSING (CRUSHING AND SCREENING), STOCKPILING, AND TRANSPORTATION. EACH OF THESE HAS ITS PARTICULAR QUALITY CONTROL PROBLEMS. THESE PROBLEMS RELATE NOT ONLY TO CONTROL TECHNIQUES BUT ALSO TO ESTABLISHMENT OF RESPONSIBILITY. SOME OF THESE PROBLEMS ARE DISCUSSED. ABOUT HALF THE ARTICLE IS DEVOTED TO SUMMARIZING THE METHODS AND CONCLUSIONS OF A 1964 REPORT, "EFFECTS OF DIFFERENT METHODS OF STOCKPILING AGGREGATES," NCHRP REPORT NO. 5.