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Title: Flowable Backfill for Pipeline Bedding at the Denver International Airport

Author(s): D. A. Clem, K. D. Hansen, and J. B. Kowalsky

Publication: Symposium Paper

Volume: 150


Appears on pages(s): 87-96

Keywords: backfilling; bedding; mix proportioning; pipes (tubes); quality control; slurries; soil cement; tests; Construction

DOI: 10.14359/4609

Date: 6/1/1994

The new Denver International Airport (DIA) has used the world's greatest volume of flowable backfill, estimated at 450,000 yd 3. For one of the initial projects, more than 70,000 yd 3 of flowable backfill were utilized as a bedding material for a concrete pipe drainage system located beneath the taxiways at DIA. The project is unique due to the large volume of flowable backfill required for a single contract, use of on-site sand, and the efficiency of the mixing and placing operation. Paper presents a case study of the project, including mix designs, cost, mixing operation, placing, quality control, and properties of the in-place material.