Laboratory Evaluation of Next-Generation Backfill Materials and Methods for Airfield Damage Repair
ERDC VICKSBURG United States
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During the period March through October 2016, research was conducted at the U.S. Army Engineer Research and Development Center in Vicksburg, MS, to develop alternative backfill materials for rapid airfield damage repairs using a variety of commercially available products. The performance of a variety of additives, including 15 traditional and non-traditional materials, and a control comprised the test matrix of stabilization additives. The types of additives included cement, polymer, polyurethane, petroleum emulsion, and silicates. This report presents the technical evaluation of the laboratory and field performance of alternative backfill materials used in the subgrade of concrete repairs using Rapid Set Concrete Mix. The additive performance criteria focused on bearing capacity, unconfined compressive strength at 2 hr and at 7 days, and durability of the specimen when partially submerged in water. Laboratory testing included mixing silty, clayey sand soil with each of the additives at specified application rates compacting curing and conducting unconfined compressive strength and California Bearing Ratio testing. For the field evaluation, a repair consisted of preparing the subgrade with a selected additive and overlaying it with Rapid Set Concrete Mix. Passes-to-failure rates for each repair were determined by using an F-15E load cart at a maximum of 3,500 passes.
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