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- W87148413 abstract "RESULTS OF A LABORATORY STUDY ARE PRESENTED ON THE APPLICABILITY OF THE PROCTOR TYPE OF COMPACTION TEST TO THE COMPACTION OF COARSE-GRADED MATERIALS. THREE REPRESENTATIVE GRANULAR MATERIALS (GRAVEL, LIMESTONE, AND SLAG) WERE TESTED THROUGH A RANGE OF CAREFULLY CONTROLLED ARTIFICIAL GRADATIONS IN WHICH THE RATIO OF COARSE TO FINE FRACTIONS WAS VARIED. THESE TESTS INDICATE THAT A MODIFIED PROCTOR PROCEDURE CAN BE USED SUCCESSFULLY TO COMPACT COARSE-GRADED MATERIALS IN EITHER A 4- OR 6-IN DIAMETER MOLD. THE MAXIMUM DENSITY OF MIXTURES OF COARSE AND FINE MATERIALS INCREASED WITH INCREASING PERCENTAGES OF COARSE MATERIAL, UP TO A POINT OF OPTIMUM GRADATION. BEYOND THIS POINT THE FURTHER ADDITION OF COARSE MATERIAL RESULTED IN LOWER DENSITIES. THE OPTIMUM GRADATION FOR THE MATERIALS USED IN THIS STUDY OCCURRED WHEN THE MIXTURES CONTAINED ABOUT 40 TO 60 PERCENT OF MATERIAL RETAINED ON THE NO. 4 SIEVE. WHEN THE MIXTURE CONTAINED MORE THAN 80 PERCENT OF COARSE MATERIAL, RESULTS OBTAINED FROM THE PROCTOR COMPACTION TEST WERE ERRATIC. DEGRADATION OF COARSE AGGREGATE DURING COMPACTION INCREASED WITH INCREASING PERCENTAGES OF COARSE MATERIAL. BREAKAGE IN THE 4-IN. MOLD WAS NEGLIGIBLE WHEN THE PLUS-4 MATERIAL WAS LESS THAN 30 PERCENT. THE INCREASE IN MAXIMUM DENSITY WHICH IS GAINED BY ADDING COARSE MATERIALS TO FINE-GRADED MIXTURES CAN BE PREDICTED BY A CORRECTION FORMULA APPLIED TO THE DENSITY OF THE FINER, OR MINUS-4, PORTION OF THE MATERIAL. CORRECTION FORMULAS WERE NOT APPLICABLE TO MIXTURES COARSER THAN THE OPTIMUM GRADATION. /AUTHOR/" @default.
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- W87148413 date "1953-01-01" @default.
- W87148413 modified "2023-09-23" @default.
- W87148413 title "LABORATORY COMPACTION TESTS OF COARSE-GRADED PAVING AND EMBANKMENT MATERIALS" @default.
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