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Lime-Cement Columns: Mix Design and Laboratory Testing

Lime-Cement Columns: Mix Design and Laboratory Testing. Jesse Jacobson, George Filz, and Jim Mitchell Virginia Tech. Lime-Cement Columns: Mix Design and Laboratory Testing. Introductory comments Problems at I-95/Route 1 interchange Scope of this research Factors influencing LCC mixtures.

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Lime-Cement Columns: Mix Design and Laboratory Testing

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  1. Lime-Cement Columns:Mix Design and Laboratory Testing Jesse Jacobson, George Filz, and Jim MitchellVirginia Tech

  2. Lime-Cement Columns: Mix Design and Laboratory Testing • Introductory comments • Problems at I-95/Route 1 interchange • Scope of this research • Factors influencing LCC mixtures

  3. Lime-Cement Columns • Adding lime and cement to clay reduces compressibility and increases strength • No spoil • Equipment designed for soft ground • Less expensive than “wet” deep soil mixing, jet grouting, or drilled shafts • More expensive but faster than surcharging with wick drains

  4. Lime-Cement Column Rig

  5. LCC Mixing Tool – 32” Diameter

  6. LCC – Finished Column

  7. LCC – Exposed 32” Diameter. Column

  8. LCC Applications for Embankments on Soft Ground • Reduces settlement • Increases stability • Reduces the bump at the end of the bridge • Especially applicable for widening existing embankments on soft ground to reduce differential settlement between old and new embankment

  9. Problems at I-95/Route 1 • Different results for laboratory tests performed by two engineering consulting firms • Poor performance of LCC test columns in a highly organic zone

  10. 150 kg Dry Lime and Cementper m3 of Mixture

  11. Scope of this Research Project • Literature review • Detailed review of I-95/Route 1 • Interview international experts • Perform laboratory test program onI-95/Route 1 soil • Develop recommended laboratory test protocol • Apply recommended protocol to West Point soil

  12. Some Factors Influencing the Performance of LCC Mixtures • Soil characteristics • Soil particle size distribution • Soil mineralogy • Amount and type of organics • Soil water content • Soil water chemistry

  13. Some Factors Influencing the Performance of LCC Mixtures • Admixtures • Lime type, hydration, and amount • Cement type and amount • Mixing • Method • Energy • Duration • Compaction into mold

  14. Some Factors Influencing the Performance of LCC Mixtures • Curing • Time • Temperature • Humidity • Confining pressure • Nature of loading • Stress state • Loading rate

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