Flowable Backfill for Pipeline Bedding at the Denver International Airport

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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: Special Publication

Volume: 150

Issue:

Appears on pages(s): 87-96

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

Date: 6/1/1994

Abstract:
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.