Quality Control Testing for a Sand-Bentonite Liner

by John E. Garlanger, Ardaman & Associates Inc, Orlando, FL, USA,
Francis K. Cheung, Ardaman & Associates Inc, Orlando, FL, USA,
Bishar S. Tannous, Ardaman & Associates Inc, Orlando, FL, USA,

Document Type: Proceeding Paper

Part of: Geotechnical Practice for Waste Disposal '87


This paper presents the results of the quality control testing performed during the construction of a sand-bentonite liner for a sanitary landfill site in Central Florida. The available borrow soil was a fine sand with an average fines content of approximately 3. 5 percent. The specified permeability after the addition of a sodium bentonite was 10** minus **8 cm/sec or less. Preliminary test data indicated that this criterion could be achieved under laboratory mixing and compaction conditions with a minimum bentonite content of 5 percent. Prior to actual production, a total of thirteen test strips were constructed for the purpose of determining the optimal bentonite content, and the spreading, mixing and compaction procedures necessary to achieve the specified permeability under field conditions. The contractor elected to use hand labor for spreading, a pulvimixer for mixing, and a vibratory steel drum roller for compacting. Laboratory testing on samples retrieved from the test strips indicated that a minimum bentonite content of 6. 0 percent was required to achieve a permeability of 10** minus **8 cm/sec or less.

Subject Headings: Laboratory tests | Quality control | Bentonite | Sandy soils | Linings | Construction sites | Field tests | Compaction (material) | Florida | United States

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