FACTORS INFLUENCING PHYSICAL PROPERTIES OF SOIL-CEMENT MIXTURES

FACTORS WHICH HAVE A PRONOUNCED INFLUENCE ON THE PHYSICAL PROPERTIES OF SOIL-CEMENT MIXTURES INCLUDE THE FOLLOWING: THE QUANTITY OF CEMENT AND WATER ADDED, THE DENSITY TO WHICH THE MIXTURE IS COMPACTED, THE LENGTH OF TIME THE SOIL, CEMENT, AND WATER ARE MIXED PRIOR TO COMPACTION, AND THE DEGREE OF PULVERIZATION OF THE SOIL IF IT IS A CLAY. THE INFLUENCE OF THESE FACTORS IS SHOWN ON THE STRENGTH AND THE RELATIVE DURABILITY OF SOIL-CEMENT SPECIMENS AS INDICATED BY THEIR RESISTANCE TO LOSS IN WEIGHT RESULTING FROM ALTERNATE CYCLES OF WETTING AND DRYING AND OF FREEZING AND THAWING IN THE LABORATORY. COMPACTED SOIL-CEMENT MIXTURES AS WERE USED PRINCIPALLY FOR BASE AND SUBBASE COURSES IN HIGHWAY AND RUNWAY CONSTRUCTION ARE CONSIDERED. TESTS WERE MADE ON MIXTURES CONTAINING SANDY, SILTY, AND CLAYEY SOILS. THE FOLLOWING SERIES OF TESTS WERE MADE TO DETERMINE THE INFLUENCE OF THE VARIOUS FACTORS UPON THE COMPRESSIVE STRENGTH AND RESISTANCE: (1) EFFECT OF DENSITY, (2) EFFECT OF MOLDING MOISTURE CONTENT, (3) EFFECT OF LENGTH OF MIXING TIME, (4) EFFECT OF DEGREE OF PULVERIZATION, (5) EFFECT OF AIR-ENTRAINING CEMENT, (6) EFFECT OF THE QUANTITY OF CEMENT, AND (7) EFFECT OF HIGH EARLY STRENGTH CEMENT. DATA ARE ALSO REPORTED FOR THREE FINE-GRAINED SOILS TREATED WITH RELATIVELY LOW PERCENTAGES OF CEMENT AND FOR THREE GRANULAR SOILS TREATED BOTH WITH LOW PERCENTAGES OF CEMENT AS REQUIRED FOR CEMENT-MODIFIED SOILS AND WITH HIGHER PERCENTAGES AS REQUIRED FOR SOIL-CEMENT. TESTS USED WERE THE WET-DRY TEST, THE FREEZE-THAW TEST, AND THE COMPRESSIVE- STRENGTH TEST. IT WAS DETERMINED THAT THE MOISTURE CONTENT OF THE SOIL-CEMENT MIXTURE AND THE DENSITY TO WHICH THE MATERIAL IS COMPACTED HAVE A GREAT INFLUENCE UPON THE QUALITY OF THE PRODUCT AFTER CEMENT HYDRATION. THE OPTIMUM MOISTURE CONTENT GENERALLY INCREASES AS THE LENGTH OF MIXING TIME INCREASES. SOIL-CEMENT MIXTURES CONTAINING AIR- ENTRAINING CEMENT BEHAVED APPROXIMATELY THE SAME AS THOSE CONTAINING TYPE I CEMENT. THE COMPRESSIVE STRENGTH AND RESISTANCE OF WETTING AND DRYING AND FREEZING AND THAWING INCREASED AS THE CEMENT CONTENT WAS INCREASED. HIGH-EARLY- STRENGTH CEMENT HARDENS SOIL-CEMENT MIX AT A FASTER RATE THAN TYPE I CEMENT. THE ADDITION OF CEMENT IN QUANTITIES LESS THAN THOSE REQUIRED TO PRODUCE HARDENED SOIL CEMENT MIX REDUCED THE PLASTICITY OF CLAYEY SOILS, THUS REDUCING THEIR TENDENCY TO SHRINK AND SWELL EXCESSIVELY. THE ADDITION OF RELATIVELY SMALL QUANTITIES OF CEMENT TO SUBSTANDARD GRANULAR MATERIALS REDUCED THEIR PLASTICITY AND INCREASED THEIR STRENGTH. BEARING-RATIO AND SONISCOPE TESTS WERE EFFECTIVE IN MEASURING THE PROGRESSIVE DETERIORATION OF SPECIMENS IN THE FREEZING-AND-THAWING TEST.

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  • Supplemental Notes:
    • No 108, pp 138-162, 21 FIG, 22 TAB, 11 REF Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
  • Authors:
    • Felt, Earl J
  • Publication Date: 1955

Language

  • English

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 138-162
  • Monograph Title: Soil and Soil-Aggregate Stabilization
  • Serial:

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Filing Info

  • Accession Number: 00231350
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 15 2004 2:41AM