STRENGTH OF SOIL-CEMENT AS A FUNCTION OF DEGREE OF MIXING

A LABORATORY INVESTIGATION IS DESCRIBED OF THE FOLLOWING VARIABLES INVOLVED IN MIXING PORTLAND CEMENT INTO A CLAYEY SILT: (1) UNIFORMITY OF SOIL AND CEMENT MIXTURE, (2) COMPRESSIVE STRENGTH OF THE RESULTANT SOIL-CEMENT, (3) TIME OF MIXING, AND (4) ACCUMULATIVE ENERGY REQUIRED FOR MIXING. MIXING WAS PERFORMED IN A PUGMILL-TYPE MIXER AND THE ENERGY REQUIRED FOR MIXING WAS AUTOMATICALLY RECORDED. SPECIMENS WERE COMPACTED IN THE HARVARD MINIATURE COMPACTION MOLD AND, AFTER CURING SEVEN DAYS, WERE TESTED IN UNCONFINED COMPRESSION. CEMENT CONCENTRATION THROUGHOUT THE SOIL-CEMENT MIXTURE WAS DETERMINED BY A RADIOACTIVE TRACER THAT WAS INCORPORATED UNIFORMLY IN THE CEMENT. DEGREE OF MIXING WAS MEASURED BY THE MIXING UNIFORMITY COEFFICIENT. RESULTS INDICATED THAT: (1) STRENGTH OF SOIL-CEMENT VARIES AS THE LOG OF MIXING UNIFORMITY, (2) STRENGTH VARIES AS THE LOG OF MIXING TIME, OR AS THE LOG OF ACCUMULATIVE MIXING ENERGY, UP TO THE ULTIMATE MIXING UNIFORMITY OF THE MIXER, (3) ULTIMATE MIXING UNIFORMITY AND MAXIMUM RESULTANT STRENGTHS ARE OBTAINED MORE RAPIDLY WHEN MIXING SLIGHTLY ON THE DRY SIDE OF OPTIMUM THAN ON THE WET SIDE OF OPTIMUM, (4) AT ANY GIVEN MIXING TIME, OR AT ANY GIVEN MIXING UNIFORMITY, THE STRENGTH OF SOIL-CEMENT MIXED AND COMPACTED SLIGHTLY DRY OF OPTIMUM IS GREATER THAN WHEN MIXED AND COMPACTED SLIGHTLY WET OF OPTIMUM, AND (5) THERE IS ROOM FOR IMPROVEMENT IN MIXING, ESPECIALLY FOR THE CLAYEY SOILS.

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  • English

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  • Accession Number: 00232393
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 15 2004 2:43AM