EFFECT OF MOLDING CONDITIONS ON THE EFFECTIVE STRESS- STRENGTH BEHAVIOR OF A STABILIZED CLAYEY SILT

THE INFLUENCE OF MOLDING WATER CONTENT, AS-MOLDED DRY DENSITY, AND DELAY TIME PRIOR TO COMPACTION AFTER MIXING IN OF THE MOLDING WATER ON THE EFFECTIVE STRESS-STRENGTH BEHAVIOR OF A CLAYEY SILT STABILIZED WITH HYDRATED LIME AND PORTLAND CEMENT IS PRESENTED IN THIS REPORT. THIS INVESTIGATION USED THE RESULTS OF HIGH PRESSURE CONSOLIDATED-UNDRAINED TRIAXIAL COMPRESSION TESTS WITH PORE WATER PRESSURE MEASUREMENTS. IT IS SHOWN THAT MOLDING CONDITIONS HAVE NO SIGNIFICANT EFFECT ON THE MOHR-COULOMB EFFECTIVE STRESS-STRENGTH PARAMETERS OF THE UNTREATED COMPACTED SOIL. FOR BOTH THE CEMENT AND LIME STABILIZED SYSTEMS, THE EFFECTIVE COHESION INTERCEPT SIGNIFICANTLY INCREASES WITH INCREASES IN AS-MOLDED DRY DENSITY WHILE THE EFFECTIVE ANGLE OF SHEARING RESISTANCE DOES NOT CHANGE. MOLDING WATER CONTENT PER SE DOES NOT INFLUENCE EITHER OF THE EFFECTIVE STRESS-STRENGTH PARAMETERS. FOR A GIVEN COMPACTIVE EFFORT, DELAY TIME PRIOR TO COMPACTION PRODUCES A DROP IN THE AS-MOLDED DRY DENSITY OF THE CEMENT STABILIZED SOIL WHICH SHOWS UP PRIMARILY AS A DROP IN THE EFFECTIVE ANGLE OF SHEARING RESISTANCE. IT ALSO LOWERS THE STRAINS REQUIRED TO REACH MOHR-COULOMB FAILURE, WHICH IS AS UNDESIRABLE CHARACTERISTICS. AN ULTIMATE FAILURE (LARGE STRAINS), IT IS SHOWN THAT NEITHER MOLDING CONDITIONS NOR DELAY TIME PRIOR TO COMPACTION HAVE ANY SIGNIFICANT EFFECT ON THE EFFECTIVE STRESS-STRENGTH PARAMETERS OF THE STABILIZED SYSTEMS. /AUTHOR/