The aim of this study was to improve understanding of the interaction of drilled shaft concrete, polymer slurry, and the foundation soil. Interface shear tests were performed in the laboratory to investigate the shear resistance between soil and a cement mortar interface after exposing the interface to a high-molecular-weight polymer slurry. Two soil types were tested: stiff silty clay and medium-dense sand. Results show that for curing periods of 7 days the interface shear resistance was 28-46% higher when exposed to the polymer slurry relative to the interface shear strength of the standard unexposed samples. The ability of the polymer slurry to penetrate and stretch through the pores of silty clay and dense sandy soils is demonstrated using scanning electron microscopy. Exposing the outside surface of cement mortar specimens to the polymer slurry for 14 days caused pitting of the mortar surface, which explains the increased interface shear resistance between the soil and the cement mortar after exposure to polymer slurry. Full-scale field tests verified the lab behavior.

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  • Corporate Authors:

    American Society for Testing and Materials (ASTM)

    100 Barr Harbor Drive, P.O. Box C700
    West Conshohocken, PA  United States  19428-2957
  • Authors:
    • Ata, A
    • O'NEILL, M
  • Publication Date: 2000-6


  • English

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Filing Info

  • Accession Number: 00794516
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 14 2000 12:00AM