Experiments on sealing water leakage in Norwegian road tunnels by chemical grouting have been carried out since 1965. In these, lignin sulphite solutions have been employed. Some simple laboratory investigaitns have been performed to obtain better knowledge of the properties of the solutions. For comparison, some experiments with AM-9 have been performed. Lignin sulphite solution gelatinizes on the addition of sodium bichromate (Na2Cr2O7) as an oxygen agent. The speed of gelatinization depends on the amount of sodium bichromate and the temperature. Usually ferric chloride is added to accelerate the process. The relation between viscosity during gelatinization and the amount of chemicals edded is presented digramatically in figures 3-10. These diagrams also indicate the conditions necessary for the production of a gel with the required properties. The lignin sulphite gel sticks well to both moist and dry rock surfaces. After gelatinization the gel will swell if water is added. By drying, the gel soon crumbles. On additing water again, further disintergation of the gel advances. AM-9 has a very low viscosity (close to water), the gelatinization takes place suddenly and is completed in few seconds. The AM-9 gel is elastic, and slips from moist and dry rocks surfaces. After gelatinization the gel does not swell noticeably if water is added. On moderate drying the gel will shrink without cracking. When rewetting the gel swells to its initial volume. /Author/

  • Corporate Authors:

    Norwegian Road Research Laboratory

    Postboks 8109, Gaustadalleen 25
    Oslo,   Norway 
  • Authors:
    • Tveide, E
  • Publication Date: 1975-9


  • Norwegian

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Subject/Index Terms

Filing Info

  • Accession Number: 00131561
  • Record Type: Publication
  • Report/Paper Numbers: No. 48
  • Files: TRIS
  • Created Date: May 14 1976 12:00AM