Title: CHANGES IN THE CHARACTERISTICS OF CEMENT-STABILIZED SOILS BY ADDITION OF EXCESS COMPACTION MOISTURE
Abstract: THE COMPACTION MOISTURE OF CEMENT-STABILIZED SOILS IS USUALLY SPECIFIED AS THE OPTIMUM MOISTURE CONTENT TO OBTAIN MAXIMUM DENSITY AS DETERMINED BY THE STANDARD PROCTOR TEST. PREVIOUS INVESTIGATIONS HAVE SHOWN THAT IN SOME INSTANCES MAXIMUM DENSITY MAY NOT CORRESPOND TO MAXIMUM STRENGTH. IF COMPACTION OF THE SOIL-CEMENT MIX IS DELAYED, THE RELATIONSHIP BETWEEN COMPACTION MOISTURE AND THE STRENGTH AND DENSITY OF THE SOIL-CEMENT ALSO CHANGES. THIS STUDY INVESTIGATES THE RELATIONSHIP BETWEEN COMPACTION MOISTURE CONTENT AND THE STRENGTH, DENSITY, AND DURABILITY OF CEMENT-STABILIZED SOILS IN WHICH COMPACTION IS DELAYED AFTER MIXING TO CORRESPOND TO TYPICAL HIGHWAY CONSTRUCTION PRACTICES. FOUR TYPES OF SOIL SUITABLE FOR CEMENT STABILIZATION WERE INVESTIGATED. THE COMPACTION MOISTURE CONTENT WAS VARIED FROM 4 PERCENT BELOW TO 4 PERCENT ABOVE THE OPTIMUM MOISTURE CONTENT OBTAINED BY STANDARD PROCTOR TESTS WITH NO DELAY BETWEEN MIXING AND COMPACTION. AT EACH OF THE MOISTURE CONTENTS, AND AT THE OPTIMUM CEMENT CONTENT, SPECIMENS WERE COMPACTED 0, 2, 4, AND 6 HOURS AFTER MIXING WITH NO INTERMITTENT MIXING. SPECIMENS WERE PREPARED FOR UNCONFINED COMPRESSIVE STRENGTH AND DURABILITY TESTS. THE RESULTS SHOW THAT THE LOSS IN STRENGTH AND DURABILITY OF SOIL-CEMENT RESULTING FROM A DELAY IN COMPACTION CAN BE SIGNIFICANTLY REDUCED IN MANY INSTANCES BY THE ADDITION OF EXCESS COMPACTION MOISTURE. THE SOILS MOST BENEFITED AFTER A DELAY IN COMPACTION BY EXCESS MOISTURE WERE THE SILTY LOAMS AND SANDY LOAMS. STRENGTH INCREASES OF 40 TO 50 PERCENT WERE ACHIEVED WITH THESE SOILS BY THE ADDITION OF 2 TO 4 PERCENT EXCESS MOISTURE WHEN COMPACTION WAS DELAYED. CEMENT-STABILIZED SILTY CLAY LOAMS AND SILTS COMPACTED AFTER DELAYS SHOWED LITTLE IMPROVEMENT IN STRENGTH AND DURABILITY WITH EXCESS COMPACTION MOISTURE. WITHOUT DELAY IN COMPACTION, ONLY THE SILTY CLAY LOAMS WERE SIGNIFICANTLY IMPROVED IN STRENGTH AND DURABILITY BY THE ADDITION OF EXCESS COMPACTION MOISTURE. A STUDY OF THE DATA HAS INDICATED THAT THE AMOUNT OF EXCESS MOISTURE REQUIRED FOR MAXIMUM STRENGTH AND DURABILITY DEPENDED ON THE SOIL TYPE AND THE DETENTION TIME BETWEEN MIXING AND COMPACTION. IN GRANULAR SOILS THE ADDITION OF EXCESS MOISTURE IMPROVED THE STRENGTH AND DURABILITY AFTER DELAYS IN COMPACTION. THIS IMPROVEMENT RESULTED FROM THE IMPROVED LUBRICATION OF THE SOIL AGGREGATES AND SUBSEQUENT INCREASE IN DRY DENSITY. WITH FINE-GRAINED SOILS EXCESS MOISTURE IMPROVED THE PROPERTIES OF SOIL-CEMENT MIXES COMPACTED WITHOUT DELAY BY INCREASING THE AMOUNT OF CEMENT HYDRATION. /AUTHOR/
Publication Year: 1970
Publication Date: 1970-01-01
Language: en
Type: article
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Cited By Count: 2
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