RAPID GRADING CURVE DETERMINATION (CONTINUATION)

SCHNELLE SIEBLINIENBESTIMMUNG (FORTSETZUNG)

IN AN EARLIER PROJECT A METHOD OF DETERMINING THE GRADING CURVE OF 0-4 MM SANDS WAS WORKED OUT. MEASURING EQUIPMENT IS TO BE BUILT AND USED AS A TEST FACILITY IN A CONCRETE MIXING PLANT. THE MEASURING PROCEDURE CONSISTS IN THE SEPARATION OF THE SAND SAMPLES, MEASUREMENT OF THE COARSE SAND FRACTIONS, AND A SPECIAL MEASUREMENT OF THE FINE SAND PARTICLES. IT IS NECESSARY TO LINK THESE THREE PROCEDURES MECHANICALLY AND ELECTRONICALLY IN SUCH A WAY THAT THE COMPLETE GRADING CURVES OF 0 - 4 MM SAND SAMPLES CAN BE CONTAINED IN ONE MEASURING PROCEDURE. THE PROCEDURE IS TO BE TESTED IN AN INDUSTRIAL CONCERN. THE BASIS SHOULD BE PROVIDED FOR THE DEVELOPMENT OF A PRODUCTION-LINE SERIES OF THE EQUIPMENT. THE METHOD SHOULD BE USED IN PARTICULAR WHERE HIGH-VALUE CONCRETES ARE REQUIRED.